Wedge profile design method and device for flow pulsation generating device

Abstract

The present application relates to the technical field of profile design, and provides a method and device for designing the profile of a wedge of a flow pulsation generating device. The method comprises: obtaining the flow area of ​​the combustion chamber gas flowing through the nozzle on the critical orifice plate based on the critical flow rate of the combustion chamber gas flowing through the nozzle on the critical orifice plate, the static pressure at the combustion chamber outlet, and the static temperature at the combustion chamber outlet; obtaining the radius of the nozzle based on the maximum flow area and the minimum radius of the wedge; obtaining the maximum radius of the wedge based on the minimum flow area and the radius of the nozzle; obtaining the non-sinusoidal waveform function that the wedge profile radius needs to satisfy based on the minimum radius of the wedge, the maximum radius of the wedge, and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas; designing the profile of the wedge based on the non-sinusoidal waveform function to obtain the target profile of the wedge. The method for profile design of the wedge in the flow pulsation generating device of the present application is simple and easy to implement, and the designed profile can adapt to gas flow rates of different sizes at the same time, which greatly breaks through the limitations of use.

Description

Technical Field

[0001] The present application relates to the technical field of profile design, and in particular to a method and device for designing a wedge profile of a flow pulsation generating device. Background Art

[0002] The flow pulsation generator is a device that can make the gas flow rate change periodically. Its basic principle is to achieve flow pulsation by periodically interfering or adjusting the gas flow path. It is widely used in industrial control, aerospace, biomedicine and other fields.

[0003] To periodically disturb or adjust the gas flow path, the relevant mechanism in the flow pulsation generating device needs to have a specific surface to guide the gas to flow along the surface path, thereby realizing the pulsation of the flow. However, the current flow pulsation generating devices have some internal mechanism surface designs that are complex, and some internal mechanism surface designs cannot adapt to larger gas flow rates, and therefore have limitations in use. Summary of the invention

[0004] The embodiments of the present application provide a wedge profile design method and device for a flow pulsation generating device, which are used to solve the technical problems of current flow pulsation generating devices, some of which have complex internal mechanism profile designs, and some of which have internal mechanism profile designs that cannot adapt to larger gas flows, and therefore have limitations in use.

[0005] In a first aspect, an embodiment of the present application provides a method for designing a wedge profile of a flow pulsation generating device, comprising:

[0006] Based on the maximum critical flow rate and the minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole on the critical orifice plate, as well as the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole are obtained;

[0007] The radius of the nozzle hole is obtained based on the maximum flow area and the minimum radius of the wedge; the minimum radius of the wedge is a preset radius of the wedge cross section in the same plane as the nozzle hole when the nozzle hole is at the maximum flow area;

[0008] Based on the minimum flow area and the radius of the nozzle hole, a maximum radius of the wedge is obtained; the maximum radius of the wedge is a target radius of a wedge cross section that is in the same plane as the nozzle hole when the nozzle hole is at the minimum flow area;

[0009] Based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, a non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained;

[0010] Designing the profile of the wedge based on the non-sinusoidal waveform function to obtain a target profile of the wedge;

[0011] The critical orifice and the wedge are arranged in a flow pulsation generating device, the critical orifice is arranged downstream of the outlet of the combustion chamber, and the wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole.

[0012] In one embodiment, the non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained based on the minimum radius of the wedge, the maximum radius of the wedge, and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, including:

[0013] When the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a triangular wave, obtaining a single triangular wave function at a preset frequency;

[0014] Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in the single triangular wave function are calculated to obtain the target triangular wave function that the wedge profile radius needs to satisfy.

[0015] In one embodiment, the non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained based on the minimum radius of the wedge, the maximum radius of the wedge, and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, including:

[0016] When the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a rectangular wave, obtaining a single rectangular wave function at a preset frequency;

[0017] Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in the single rectangular wave function are calculated to obtain the target rectangular wave function that the wedge profile radius needs to satisfy.

[0018] In one embodiment, the designing of the profile of the wedge based on the non-sinusoidal waveform function to obtain the target profile of the wedge includes:

[0019] Adjusting the amplitude of the non-sinusoidal flow pulsation waveform to obtain an adjusted amplitude;

[0020] After calculating the adjusted maximum critical flow and the adjusted minimum critical flow based on the adjusted amplitude, return to the step of obtaining the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole on the critical orifice plate based on the maximum critical flow and the minimum critical flow, and the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, until the adjusted target profile of the wedge is obtained.

[0021] In one embodiment, the calculating of the profile parameters in the single triangular wave function based on the minimum radius of the wedge and the maximum radius of the wedge to obtain the target triangular wave function that the wedge profile radius needs to satisfy includes:

[0022] Adjusting the preset frequency to obtain an adjusted frequency;

[0023] Segmenting the single-fold triangular wave function based on the adjusted frequency to obtain multiple segments of single-fold triangular wave functions;

[0024] Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in each section of the single triangular wave function are calculated to obtain the adjusted target triangular wave function that the wedge profile radius needs to satisfy.

[0025] In one embodiment, the calculating of the profile parameters in the single rectangular wave function based on the minimum radius of the wedge and the maximum radius of the wedge to obtain the target rectangular wave function that the wedge profile radius needs to satisfy comprises:

[0026] Adjusting the preset frequency to obtain an adjusted frequency;

[0027] Segmenting the single rectangular wave function based on the adjusted frequency to obtain multiple segments of single rectangular wave functions;

[0028] Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in each section of the single rectangular wave function are calculated to obtain the adjusted target rectangular wave function that the wedge profile radius needs to satisfy.

[0029] In a second aspect, an embodiment of the present application provides a wedge profile design device for a flow pulsation generating device, comprising:

[0030] A flow area calculation module, used to obtain a maximum flow area and a minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole on the critical orifice plate based on a maximum critical flow rate and a minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole, and a combustion chamber outlet static pressure and a combustion chamber outlet static temperature;

[0031] A nozzle radius calculation module, used to: obtain the radius of the nozzle based on the maximum flow area and the minimum wedge radius; the minimum wedge radius is a preset radius of the wedge cross section in the same plane as the nozzle when the nozzle is at the maximum flow area;

[0032] a wedge radius calculation module, for obtaining a maximum wedge radius based on the minimum flow area and the radius of the nozzle hole; the maximum wedge radius is a target radius of a wedge cross section in the same plane as the nozzle hole when the nozzle hole is in the minimum flow area;

[0033] A profile function determination module, used to obtain a non-sinusoidal waveform function that the wedge profile radius needs to satisfy based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas;

[0034] A wedge profile design module is used to: design the profile of the wedge based on the non-sinusoidal waveform function to obtain a target profile of the wedge;

[0035] The critical orifice and the wedge are arranged in a flow pulsation generating device, the critical orifice is arranged downstream of the outlet of the combustion chamber, and the wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole.

[0036] In a third aspect, an embodiment of the present application provides an electronic device, comprising a processor and a memory storing a computer program, wherein when the processor executes the program, the steps of the wedge profile design method for a flow pulsation generating device described in the first aspect are implemented.

[0037] In a fourth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the wedge profile design method for a flow pulsation generating device described in the first aspect.

[0038] In a fifth aspect, an embodiment of the present application provides a non-transitory computer-readable storage medium, comprising a computer program, which, when executed by a processor, implements the steps of the wedge profile design method for a flow pulsation generating device described in the first aspect.

[0039] The present application provides a wedge profile design method and device for a flow pulsation generating device. Based on the maximum critical flow rate and minimum critical flow rate of the combustion chamber gas flowing through the nozzle on the critical orifice plate, as well as the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, the maximum flow area and minimum flow area of ​​the combustion chamber gas flowing through the nozzle are obtained. Based on the maximum flow area and the minimum radius of the wedge, the radius of the nozzle is obtained. The minimum radius of the wedge is the preset radius of the wedge cross section in the same plane as the nozzle when the nozzle is at the maximum flow area. Based on the minimum flow area and the radius of the nozzle, the maximum radius of the wedge is obtained. The maximum radius of the wedge is the target radius of the wedge cross section in the same plane as the nozzle when the nozzle is at the minimum flow area. Based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, the non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained. The profile of the wedge is designed based on the non-sinusoidal waveform function to obtain the target profile of the wedge. In the present application, the critical orifice and the wedge are arranged in the flow pulsation generating device. The critical orifice is arranged downstream of the outlet of the combustion chamber. The wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole. If the gas flow rate is to change periodically, the flow area needs to change periodically. The present application is based on the maximum critical flow rate and the minimum critical flow rate when the gas is in a critical state, combined with the static pressure and static temperature of the combustion chamber outlet, so as to obtain the maximum flow area and the minimum flow area. Since the flow area is the difference between the nozzle area of ​​the critical orifice and the cross-sectional area of ​​the wedge, the maximum flow area and the minimum flow area are obtained when the nozzle area remains unchanged. The areas correspond to the minimum radius of the wedge cross section and the maximum radius of the wedge cross section respectively, so that a non-sinusoidal waveform function that meets the requirements of the non-sinusoidal flow pulsation waveform can be calculated based on the minimum radius and the maximum radius. This function can characterize the design requirements of the wedge profile by the periodic change of the wedge cross-sectional radius between the maximum radius and the minimum radius, so that the designed wedge target profile can cooperate with the nozzle to form a periodic change of the flow area between the maximum flow area and the minimum flow area. When the combustion chamber gas flows through the flow area between the nozzle and the wedge profile, a non-sinusoidal flow pulsation with periodic changes between the maximum critical flow and the minimum critical flow can be generated. The method for designing the profile of the wedge in the flow pulsation generating device in the present application is simple and easy to implement, and the designed profile can adapt to gas flows of different sizes at the same time, which greatly breaks through the limitations of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 It is one of the flow diagrams of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0042] Figure 2 This is the second flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0043] Figure 3 It is one of the wedge profile curves obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0044] Figure 4 It is one of the flow pulsation curves obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0045] Figure 5 It is one of the wedge target profile diagrams obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0046] Figure 6 This is the third flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0047] Figure 7 This is the second wedge profile curve diagram obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0048] Figure 8 This is the second flow pulsation curve diagram obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0049] Fig. 9 This is the second wedge target profile diagram obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0050] Fig.10 This is the fourth flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0051] Fig.11 This is the fifth flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0052] Fig.12 This is the third wedge profile curve diagram obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0053] Fig.13 This is the third flow pulsation curve diagram obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0054] Fig.14 This is the third wedge target profile diagram obtained by the wedge profile design method for the flow pulsation generating device provided in the embodiment of the present application;

[0055] Fig.15 This is the sixth flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0056] Fig.16 This is the fourth wedge profile curve diagram obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0057] Fig.17 This is the fourth flow pulsation curve diagram obtained by the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application;

[0058] Fig.18 This is the fourth wedge target profile diagram obtained by the wedge profile design method for the flow pulsation generating device provided in the embodiment of the present application;

[0059] Fig.19 It is a structural schematic diagram of a wedge profile design device for a flow pulsation generating device provided in an embodiment of the present application;

[0060] Fig. 20 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] It should be noted that in the description of the embodiments of the present application, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. The orientation or position relationship indicated by the terms "upper", "lower" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0063] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0064] Figure 1 This is one of the flow charts of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application. Figure 1 The present application provides a method for designing a wedge profile of a flow pulsation generating device, which may include:

[0065] 101. Based on the maximum critical flow rate and minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole on the critical orifice plate, as well as the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, the maximum flow area and minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole are obtained;

[0066] 102. Based on the maximum flow area and the minimum radius of the wedge, the radius of the nozzle hole is obtained;

[0067] The minimum radius of the wedge is the preset radius of the wedge cross section in the same plane as the nozzle hole when the nozzle hole is at the maximum flow area;

[0068] 103. Based on the minimum flow area and the radius of the nozzle hole, the maximum radius of the wedge is obtained;

[0069] The maximum radius of the wedge is the target radius of the wedge cross section in the same plane as the nozzle when the nozzle is at the minimum flow area;

[0070] 104. Based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, a non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained;

[0071] 105. The profile of the wedge is designed based on the non-sinusoidal waveform function to obtain the target profile of the wedge.

[0072] The critical orifice plate and the wedge are arranged in the flow pulsation generating device. The critical orifice plate is arranged downstream of the outlet of the combustion chamber. The wedge reciprocates in the spray hole to change the flow area of ​​the combustion chamber gas flowing through the spray hole.

[0073] The flow pulsation generating device of the present application can be used for aircraft engines or ground gas turbine combustion chamber test pieces, hereinafter referred to as combustion chambers. When the combustion chamber gas flows through the nozzle of the critical orifice plate, its flow velocity is the speed of sound and reaches a critical state. When the combustion chamber outlet static pressure and outlet static temperature remain unchanged, the critical flow rate of the combustion chamber gas flowing through the nozzle of the critical orifice plate is only related to the flow area of ​​the nozzle. Therefore, the use of a linear motion device to drive a wedge of a specific profile to perform periodic motion in the nozzle will change the flow area of ​​the nozzle, thereby generating flow pulsations at the combustion chamber outlet. Due to the conservation of mass, the flow pulsations generated at the combustion chamber outlet will cause corresponding flow pulsations at the combustion chamber inlet, providing hardware support for experimental research on the combustion dynamic characteristics of the combustion chamber.

[0074] Taking aircraft as an example, transient operations of aircraft, such as sudden acceleration and deceleration during stable flight, large-scale maneuvers of military aircraft, and compressor surge, will cause low-frequency, high-amplitude flow pulsation of the gas in the engine combustion chamber. The pressure pulsation caused by flow or speed disturbance will cause flame heat release pulsation, leading to engine flameout, backfire, or change in flame stability mode, seriously affecting the safety and pollutant emissions of the engine. This application can make the combustion chamber gas produce periodic flow pulsation through external excitation, simulate the flame response characteristics under this state, which is of great significance for studying the instability of aircraft engine combustion, improving the combustion organization mode, and improving the safety of aircraft engines.

[0075] In step 101, when the combustion chamber gas reaches a critical state, its corresponding critical flow It can be obtained according to the following formula:

[0076] ;

[0077] in, is a constant, which is mainly related to the gas specific heat ratio, gas constant, flow coefficient and flow function. is the static pressure at the combustion chamber outlet (i.e. the nozzle inlet of the critical orifice plate), is the static temperature at the combustion chamber outlet, is the gas specific heat ratio, is the flow area of ​​the combustion chamber gas flowing through the nozzle hole, is the Mach number. Since the gas velocity in the critical combustion chamber reaches the speed of sound, , so the above formula can be transformed into:

[0078] ; (1-1)

[0079] In this embodiment, The value is 0.036064. It can be taken as 1.4. Under the condition of critical flow rate of 0.3 kg / s, since the combustion chamber gas will inevitably fluctuate during the flow process, it will cause the critical flow rate to oscillate. Assuming that the relative amplitude of the critical flow rate is 30%, the maximum critical flow rate is 0.39 kg / s and the minimum critical flow rate is 0.21 kg / s. Assuming MPa, Kelvin, substituting the maximum critical flow rate and the minimum critical flow rate into formula (1-1) can obtain the maximum flow area The minimum flow area is 880.65 square millimeters. It is 474.20 square millimeters.

[0080] In step 102, due to ,in, is the nozzle area, is the cross-sectional area of ​​the wedge in the same plane as the nozzle hole, assuming that the minimum radius of the wedge =10 mm, then square millimeter, the radius of the nozzle is 19.5 mm.

[0081] In step 103, the maximum radius of the wedge satisfy , we can get Millimeters.

[0082] In step 104 to step 105, if the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a triangular wave, then and The triangular wave function that the wedge profile radius needs to satisfy is obtained, and the profile of the wedge is designed based on the triangular wave function to obtain the target profile of the wedge; if the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a rectangular wave, then the target profile of the wedge can be obtained based on and A rectangular wave function that the radius of the wedge profile needs to satisfy is obtained, and the profile of the wedge is designed based on the rectangular wave function to obtain the target profile of the wedge.

[0083] The wedge profile design method of the flow pulsation generating device provided in the present embodiment obtains the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle on the critical orifice plate based on the maximum critical flow rate and the minimum critical flow rate of the combustion chamber gas flowing through the nozzle on the critical orifice plate, as well as the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, obtains the radius of the nozzle based on the maximum flow area and the minimum radius of the wedge, the minimum radius of the wedge is the preset radius of the wedge cross section in the same plane as the nozzle when the nozzle is at the maximum flow area, obtains the maximum radius of the wedge based on the minimum flow area and the radius of the nozzle, the maximum radius of the wedge is the target radius of the wedge cross section in the same plane as the nozzle when the nozzle is at the minimum flow area, obtains the non-sinusoidal waveform function that the wedge profile radius needs to satisfy based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, designs the profile of the wedge based on the non-sinusoidal waveform function, and obtains the target profile of the wedge. In this embodiment, the critical orifice and the wedge are arranged in the flow pulsation generating device. The critical orifice is arranged downstream of the outlet of the combustion chamber. The wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole. If the gas flow rate is to change periodically, the flow area needs to change periodically. This embodiment is based on the maximum critical flow rate and the minimum critical flow rate when the gas is in a critical state, combined with the static pressure and static temperature of the combustion chamber outlet, so as to obtain the maximum flow area and the minimum flow area. Since the flow area is the difference between the nozzle area of ​​the critical orifice and the cross-sectional area of ​​the wedge, the maximum flow area and the minimum flow area are obtained when the nozzle area remains unchanged. The minimum radius of the wedge cross section and the maximum radius of the wedge cross section respectively correspond to the flow area, so that a non-sinusoidal waveform function that meets the non-sinusoidal flow pulsation waveform requirements can be calculated based on the minimum radius and the maximum radius. This function can characterize the design requirements of the wedge profile by the periodic change of the wedge cross-sectional radius between the maximum radius and the minimum radius, so that the designed wedge target profile can cooperate with the nozzle to form a periodic change of the flow area between the maximum flow area and the minimum flow area. When the combustion chamber gas flows through the flow area between the nozzle and the wedge profile, a non-sinusoidal flow pulsation with periodic changes between the maximum critical flow and the minimum critical flow can be generated. The method for designing the profile of the wedge in the flow pulsation generating device in this embodiment is simple and easy to implement, and the designed profile can adapt to gas flows of different sizes at the same time, which greatly breaks through the limitations of use.

[0084] Figure 2 This is the second flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application. Figure 2 In one embodiment, based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, the non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained, which may include:

[0085] 201. When the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a triangular wave, a single triangular wave function at a preset frequency is obtained;

[0086] 202. Based on the minimum radius and the maximum radius of the wedge, calculate the profile parameters in the single triangular wave function to obtain the target triangular wave function that the wedge profile radius needs to satisfy.

[0087] In step 201, it is assumed that the linear motion device that drives the wedge to perform periodic reciprocating motion in the spray hole is an electric cylinder that moves at a constant speed. The motion curve of the electric cylinder can be expressed by the following formula:

[0088] ; (2-1)

[0089] in, is the displacement of the electric cylinder, is the speed of the electric cylinder, is the movement time of the electric cylinder, is the motion cycle of the electric cylinder, is the stroke of the electric cylinder, is the motion frequency of the electric cylinder. It should be noted that since the wedge is driven by the electric cylinder, the motion parameters of the electric cylinder in formula (2-1) are also the motion parameters of the wedge.

[0090] Assuming the external excitation frequency is 10 Hz, the movement frequency of the electric cylinder must be consistent with the external excitation frequency, that is, Hertz, in the stroke of the electric cylinder When the electric cylinder is 100 mm in diameter, the motion curve is:

[0091] ; (2-2)

[0092] exist The single triangle wave function in Hertz can be expressed as follows:

[0093] ; (2-3)

[0094] in, is the cross-sectional radius of the wedge, and is the profile parameter of the wedge. Substituting formula (2-2) into formula (2-3) yields:

[0095] ; (2-4)

[0096] In step 202, when When the maximum value is reached, the stroke of the electric cylinder also reaches the maximum value, that is, mm, displacement of the electric cylinder in linear motion mm; when When the minimum value is reached, the stroke of the electric cylinder also reaches the minimum value, that is, mm, displacement of the electric cylinder in linear motion mm, so the following equation can be obtained according to formula (2-4):

[0097] ; (2-5)

[0098] exist mm, = 10 mm, we can solve formula (2-5) to get , ,Will and Substituting into formula (2-4) we get:

[0099] ;

[0100] Then we have:

[0101] ; (2-6)

[0102] Formula (2-6) is the target triangular wave function that the wedge profile radius needs to satisfy. The waveform of the target triangular wave function, that is, the designed wedge profile curve, can be expressed as Figure 3 As shown, the combustion chamber gas flow pulsation curve corresponding to the wedge profile curve can be shown as Figure 4 As shown in FIG. 1 , the wedge target surface designed based on the target triangular wave function can be Figure 5 As shown, Figure 5 In order to ensure that the flow field structure at the wedge does not change significantly, the shape from the front end of the wedge to the minimum radius of the wedge is preferably conical, and the rear end of the wedge is connected to the connecting rod of the electric cylinder.

[0103] In this embodiment, when the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a triangular wave, a single triangular wave function at a preset frequency is first obtained, and then an equation for solving the unknown profile parameters in the single triangular wave function is established based on the minimum radius of the wedge and the maximum radius of the wedge. This can more accurately obtain the triangular wave function that the wedge cross-sectional radius needs to satisfy, that is, the target triangular wave function that the wedge profile radius needs to satisfy. This can then accurately design a wedge target profile that meets the flow pulsation waveform requirements based on the target triangular wave function.

[0104] Figure 6 This is the third flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application. Figure 6 In one embodiment, based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, the non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained, which may include:

[0105] 601. When the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a rectangular wave, a single rectangular wave function at a preset frequency is obtained;

[0106] 602. Based on the minimum radius and the maximum radius of the wedge, calculate the profile parameters in the single rectangular wave function to obtain the target rectangular wave function that the wedge profile radius needs to satisfy.

[0107] In step 601, The single rectangular wave function under Hertz can be expressed as follows:

[0108] ; (6-1)

[0109] in, and are the profile parameters of the wedge.

[0110] In step 602, the displacement of the electric cylinder is divided into two sections based on the total stroke of the electric cylinder, one section corresponding to the minimum radius of the wedge and the other section corresponding to the maximum radius of the wedge. Corresponding minimum wedge radius = 10 mm, Corresponding to the maximum radius of the wedge mm, we can solve formula (6-1) to get , , then we can get the following equation according to formula (6-1):

[0111] ; (6-2)

[0112] Formula (6-2) is the target rectangular wave function that the wedge profile radius needs to satisfy. The waveform of the target rectangular wave function, that is, the designed wedge profile curve, can be expressed as Figure 7 As shown, the combustion chamber gas flow pulsation curve corresponding to the wedge profile curve can be shown as Figure 8 As shown, the wedge target surface designed based on the target rectangular wave function can be Fig. 9 As shown, Fig. 9 In order to ensure that the flow field structure at the wedge does not change significantly, the shape from the front end of the wedge to the minimum radius of the wedge is preferably conical, and the rear end of the wedge is connected to the connecting rod of the electric cylinder.

[0113] In this embodiment, when the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a rectangular wave, a single rectangular wave function at a preset frequency is first obtained, and then an equation for solving the unknown surface parameters in the single rectangular wave function is established based on the minimum radius of the wedge and the maximum radius of the wedge. This can more accurately obtain the rectangular wave function that the wedge cross-sectional radius needs to satisfy, that is, the target rectangular wave function that the wedge surface radius needs to satisfy. This can then accurately design a wedge target surface that meets the flow pulsation waveform requirements based on the target rectangular wave function.

[0114] Fig.10 This is the fourth flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application. Fig.10 In one embodiment, the profile of the wedge is designed based on the non-sinusoidal waveform function. After obtaining the target profile of the wedge, the following steps may be performed:

[0115] 1001. Adjust the amplitude of the non-sinusoidal flow pulsation waveform to obtain an adjusted amplitude;

[0116] 1002. After calculating the adjusted maximum critical flow rate and the adjusted minimum critical flow rate based on the adjusted amplitude, return to the step of obtaining the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole on the critical orifice plate based on the maximum critical flow rate and the minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole, and the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, until the adjusted target surface of the wedge is obtained.

[0117] In step 1001, the amplitude of the non-sinusoidal flow pulsation waveform corresponds to the relative amplitude of the critical flow, so the amplitude of the non-sinusoidal flow pulsation waveform can be adjusted by adjusting the relative amplitude of the flow.

[0118] In step 1002, since the relative amplitude of the flow is adjusted, the maximum critical flow and the minimum critical flow will change relative to the same critical flow. The adjusted maximum critical flow and minimum critical flow can be calculated, and the target profile of the wedge can be redesigned based on the above method to obtain the adjusted target profile of the wedge to meet the adjusted flow pulsation waveform requirements.

[0119] This embodiment can conveniently and quickly recalculate the target waveform function based on the amplitude change of the flow pulsation waveform, thereby achieving efficient design of the wedge target profile.

[0120] Fig.11 This is the fifth flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application. Fig.11In one embodiment, based on the minimum radius and the maximum radius of the wedge, the profile parameters in the single triangular wave function are calculated, and after obtaining the target triangular wave function that the wedge profile radius needs to satisfy, the following may be included:

[0121] 1101. Adjust the preset frequency to obtain an adjusted frequency;

[0122] 1102. Segment the single-time triangular wave function based on the adjusted frequency to obtain multiple segments of single-time triangular wave functions;

[0123] 1103. Based on the minimum radius and the maximum radius of the wedge, calculate the profile parameters in each section of the single triangular wave function to obtain the adjusted target triangular wave function that the wedge profile radius needs to satisfy.

[0124] In step 1101 to step 1102, it is assumed that Adjust to , then in The multi-segment single triangle wave function under Hertz can be expressed as follows:

[0125] ; (11-1)

[0126] in, , , and are the profile parameters of the wedge.

[0127] In step 1103, the displacement of the electric cylinder is divided into two sections based on the total stroke of the electric cylinder, one section corresponding to the monotonically increasing radius of the wedge cross section, and the other section corresponding to the monotonically decreasing radius of the wedge cross section. Corresponding to the monotonically increasing radius of the wedge cross section, Corresponding to the monotonically decreasing radius of the wedge cross section, interval, when When the maximum value is reached, ,when When the minimum value is reached, ;exist interval, when When the minimum value is reached, , so according to formula (11-1) we can get the following equation:

[0128] ; (11-2)

[0129] exist mm, = 10 mm, we can solve formula (11-2) to get , , , ,Will , , and Substituting into formula (11-1) we get:

[0130] ;

[0131] Then we have:

[0132] ; (11-3)

[0133] Formula (11-3) is the adjusted target triangular wave function that the wedge profile radius needs to satisfy. The waveform of the adjusted target triangular wave function, that is, the adjusted designed wedge profile curve can be expressed as follows: Fig.12 As shown, the combustion chamber gas flow pulsation curve corresponding to the wedge profile curve can be shown as Fig.13 As shown, the wedge target surface designed based on the adjusted target triangular wave function can be Fig.14 As shown, Fig.14 In order to ensure that the flow field structure at the wedge does not change significantly, the shape from the front end of the wedge to the minimum radius of the wedge is preferably conical, and the rear end of the wedge is connected to the connecting rod of the electric cylinder.

[0134] This embodiment can conveniently and quickly recalculate the target waveform function based on the frequency change of the flow pulsation waveform, thereby achieving efficient design of the wedge target profile.

[0135] Fig.15 This is the sixth flow chart of the wedge profile design method of the flow pulsation generating device provided in the embodiment of the present application. Fig.15 In one embodiment, after calculating the profile parameters in the single rectangular wave function based on the minimum radius and the maximum radius of the wedge, and obtaining the target rectangular wave function that the wedge profile radius needs to satisfy, the following steps may be included:

[0136] 1501. Adjust the preset frequency to obtain an adjusted frequency;

[0137] 1502. Segment the single rectangular wave function based on the adjusted frequency to obtain multiple segments of single rectangular wave functions;

[0138] 1503. Based on the minimum radius and the maximum radius of the wedge, calculate the profile parameters in each section of the single rectangular wave function to obtain the adjusted target rectangular wave function that the wedge profile radius needs to satisfy.

[0139] In step 1501 to step 1502, it is assumed that Adjust to , then in The multi-segment single rectangular wave function under Hertz can be expressed as follows:

[0140] ; (15-1)

[0141] in, and are the profile parameters of the wedge.

[0142] That is, the displacement of the electric cylinder is divided into four sections based on the total stroke of the electric cylinder. and Corresponding minimum wedge radius = 10 mm, and Corresponding to the maximum radius of the wedge mm, we can solve formula (15-1) to get , , then the following equation can be obtained according to formula (15-1):

[0143] ; (15-2)

[0144] Formula (15-2) is the adjusted target rectangular wave function that the wedge profile radius needs to satisfy. The waveform of the adjusted target rectangular wave function, that is, the adjusted designed wedge profile curve can be expressed as Fig.16 As shown, the combustion chamber gas flow pulsation curve corresponding to the wedge profile curve can be shown as Fig.17 As shown, the wedge target surface designed based on the adjusted target rectangular wave function can be as follows Fig.18 As shown, Fig.18 In order to ensure that the flow field structure at the wedge does not change significantly, the shape from the front end of the wedge to the minimum radius of the wedge is preferably conical, and the rear end of the wedge is connected to the connecting rod of the electric cylinder.

[0145] This embodiment can conveniently and quickly recalculate the target waveform function based on the frequency change of the flow pulsation waveform, thereby achieving efficient design of the wedge target profile.

[0146] The wedge profile design device for a flow pulsation generating device provided in an embodiment of the present application is described below. The wedge profile design device for a flow pulsation generating device described below and the wedge profile design method for a flow pulsation generating device described above can be referenced to each other.

[0147] Fig.19 Schematic diagram of the structure of the wedge profile design device for the flow pulsation generating device provided in the embodiment of the present application. Fig.19 The embodiment of the present application provides a wedge profile design device for a flow pulsation generating device, which may include:

[0148] The flow area calculation module 1901 is used to obtain the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole on the critical orifice plate based on the maximum critical flow rate and the minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole on the critical orifice plate, and the combustion chamber outlet static pressure and the combustion chamber outlet static temperature;

[0149] The nozzle radius calculation module 1902 is used to: obtain the radius of the nozzle based on the maximum flow area and the minimum wedge radius; the minimum wedge radius is a preset radius of the wedge cross section in the same plane as the nozzle when the nozzle is at the maximum flow area;

[0150] The wedge radius calculation module 1903 is used to: obtain a maximum wedge radius based on the minimum flow area and the radius of the nozzle hole; the maximum wedge radius is a target radius of a wedge cross section that is in the same plane as the nozzle hole when the nozzle hole is in the minimum flow area;

[0151] The profile function determination module 1904 is used to obtain a non-sinusoidal waveform function that the wedge profile radius needs to satisfy based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas;

[0152] A wedge profile design module 1905 is used to design the profile of the wedge based on the non-sinusoidal waveform function to obtain a target profile of the wedge;

[0153] The critical orifice and the wedge are arranged in a flow pulsation generating device, the critical orifice is arranged downstream of the outlet of the combustion chamber, and the wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole.

[0154] The present embodiment provides a wedge profile design device for a flow pulsation generating device, wherein a critical orifice and a wedge are arranged in the flow pulsation generating device, wherein the critical orifice is arranged downstream of the outlet of the combustion chamber, and the wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole. If the gas flow rate is to be changed periodically, the flow area needs to be changed periodically. The present embodiment is based on the maximum critical flow rate and the minimum critical flow rate when the gas is in a critical state, combined with the static pressure and static temperature at the outlet of the combustion chamber, so as to obtain the maximum flow area and the minimum flow area. Since the flow area is the difference between the nozzle area of ​​the critical orifice and the cross-sectional area of ​​the wedge, the maximum flow area can be obtained when the nozzle area remains unchanged. The minimum radius of the wedge cross section and the maximum radius of the wedge cross section corresponding to the maximum flow area and the minimum flow area respectively, so that the non-sinusoidal waveform function that meets the non-sinusoidal flow pulsation waveform requirements can be calculated based on the minimum radius and the maximum radius. This function can characterize the design requirements of the wedge profile by the periodic change of the wedge cross-sectional radius between the maximum radius and the minimum radius, so that the designed wedge target profile can cooperate with the nozzle to form a periodic change of the flow area between the maximum flow area and the minimum flow area. When the combustion chamber gas flows through the flow area between the nozzle and the wedge profile, a non-sinusoidal flow pulsation with periodic changes between the maximum critical flow and the minimum critical flow can be generated. The method for designing the profile of the wedge in the flow pulsation generating device in this embodiment is simple and easy to implement, and the designed profile can adapt to gas flows of different sizes at the same time, which greatly breaks through the limitations of use.

[0155] In one embodiment, the profile function determination module 1904 is specifically configured to:

[0156] When the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a triangular wave, obtaining a single triangular wave function at a preset frequency;

[0157] Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in the single triangular wave function are calculated to obtain the target triangular wave function that the wedge profile radius needs to satisfy.

[0158] In one embodiment, the profile function determination module 1904 is specifically configured to:

[0159] When the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a rectangular wave, obtaining a single rectangular wave function at a preset frequency;

[0160] Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in the single rectangular wave function are calculated to obtain the target rectangular wave function that the wedge profile radius needs to satisfy.

[0161] In one embodiment, a waveform adjustment module (not shown in the figure) is further included, which is used to:

[0162] Adjusting the amplitude of the non-sinusoidal flow pulsation waveform to obtain an adjusted amplitude;

[0163] After calculating the adjusted maximum critical flow and the adjusted minimum critical flow based on the adjusted amplitude, return to the step of obtaining the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole on the critical orifice plate based on the maximum critical flow and the minimum critical flow, and the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, until the adjusted target profile of the wedge is obtained.

[0164] In one embodiment, the waveform adjustment module is further used to:

[0165] Adjusting the preset frequency to obtain an adjusted frequency;

[0166] Segmenting the single-fold triangular wave function based on the adjusted frequency to obtain multiple segments of single-fold triangular wave functions;

[0167] Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in each section of the single triangular wave function are calculated to obtain the adjusted target triangular wave function that the wedge profile radius needs to satisfy.

[0168] In one embodiment, the waveform adjustment module is further used to:

[0169] Adjusting the preset frequency to obtain an adjusted frequency;

[0170] Segmenting the single rectangular wave function based on the adjusted frequency to obtain multiple segments of single rectangular wave functions;

[0171] Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in each section of the single rectangular wave function are calculated to obtain the adjusted target rectangular wave function that the wedge profile radius needs to satisfy.

[0172] The shape from the front end of the wedge to the minimum radius of the wedge is designed to be conical, so that the flow field structure at the wedge does not change significantly and the wedge will not be subjected to too much pressure. Therefore, its interior can be designed to be hollow to arrange the cooling channel, while also reducing the weight to a certain extent.

[0173] Fig. 20 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application, such as Fig. 20As shown, the electronic device may include: a processor 2010, a communication interface 2020, a memory 2030 and a communication bus 2040, wherein the processor 2010, the communication interface 2020 and the memory 2030 communicate with each other through the communication bus 2040. The processor 2010 may call a computer program in the memory 2030 to execute the steps of the wedge profile design method of the flow pulsation generating device, for example including:

[0174] Based on the maximum critical flow rate and the minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole on the critical orifice plate, as well as the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole are obtained;

[0175] The radius of the nozzle hole is obtained based on the maximum flow area and the minimum radius of the wedge; the minimum radius of the wedge is a preset radius of the wedge cross section in the same plane as the nozzle hole when the nozzle hole is at the maximum flow area;

[0176] Based on the minimum flow area and the radius of the nozzle hole, a maximum radius of the wedge is obtained; the maximum radius of the wedge is a target radius of a wedge cross section that is in the same plane as the nozzle hole when the nozzle hole is at the minimum flow area;

[0177] Based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, a non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained;

[0178] Designing the profile of the wedge based on the non-sinusoidal waveform function to obtain a target profile of the wedge;

[0179] The critical orifice and the wedge are arranged in a flow pulsation generating device, the critical orifice is arranged downstream of the outlet of the combustion chamber, and the wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole.

[0180] In addition, the logic instructions in the above-mentioned memory 2030 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0181] On the other hand, an embodiment of the present application further provides a computer program product, the computer program product comprising a computer program, the computer program can be stored on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer can execute the steps of the wedge profile design method of the flow pulsation generating device provided in the above embodiments, for example, including:

[0182] Based on the maximum critical flow rate and the minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole on the critical orifice plate, as well as the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole are obtained;

[0183] The radius of the nozzle hole is obtained based on the maximum flow area and the minimum radius of the wedge; the minimum radius of the wedge is a preset radius of the wedge cross section in the same plane as the nozzle hole when the nozzle hole is at the maximum flow area;

[0184] Based on the minimum flow area and the radius of the nozzle hole, a maximum radius of the wedge is obtained; the maximum radius of the wedge is a target radius of a wedge cross section that is in the same plane as the nozzle hole when the nozzle hole is at the minimum flow area;

[0185] Based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, a non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained;

[0186] Designing the profile of the wedge based on the non-sinusoidal waveform function to obtain a target profile of the wedge;

[0187] The critical orifice and the wedge are arranged in a flow pulsation generating device, the critical orifice is arranged downstream of the outlet of the combustion chamber, and the wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole.

[0188] On the other hand, the embodiment of the present application further provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program is used to cause a processor to execute the steps of the wedge profile design method of the flow pulsation generating device provided in the above embodiments, for example, including:

[0189] Based on the maximum critical flow rate and the minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole on the critical orifice plate, as well as the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole are obtained;

[0190] The radius of the nozzle hole is obtained based on the maximum flow area and the minimum radius of the wedge; the minimum radius of the wedge is a preset radius of the wedge cross section in the same plane as the nozzle hole when the nozzle hole is at the maximum flow area;

[0191] Based on the minimum flow area and the radius of the nozzle hole, a maximum radius of the wedge is obtained; the maximum radius of the wedge is a target radius of a wedge cross section that is in the same plane as the nozzle hole when the nozzle hole is at the minimum flow area;

[0192] Based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, a non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained;

[0193] Designing the profile of the wedge based on the non-sinusoidal waveform function to obtain a target profile of the wedge;

[0194] The critical orifice and the wedge are arranged in a flow pulsation generating device, the critical orifice is arranged downstream of the outlet of the combustion chamber, and the wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole.

[0195] The non-transitory computer-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (such as CD, DVD, BD, HVD, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)), etc.

[0196] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0197] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0198] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for designing a wedge profile of a flow pulsation generating device, characterized in that: include: Based on the maximum critical flow rate and the minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole on the critical orifice plate, as well as the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole are obtained; Based on the maximum flow area and the minimum radius of the wedge, the radius of the spray hole is obtained; The minimum radius of the wedge is a preset radius of the cross section of the wedge in the same plane as the nozzle hole when the nozzle hole is at the maximum flow area; Based on the minimum flow area and the radius of the nozzle hole, a maximum radius of the wedge is obtained; the maximum radius of the wedge is a target radius of a wedge cross section that is in the same plane as the nozzle hole when the nozzle hole is at the minimum flow area; Based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, a non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained; Designing the profile of the wedge based on the non-sinusoidal waveform function to obtain a target profile of the wedge; The critical orifice and the wedge are arranged in a flow pulsation generating device, the critical orifice is arranged downstream of the outlet of the combustion chamber, and the wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole.

2. The wedge profile design method of a flow pulsation generating device according to claim 1, characterized in that: The non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, including: When the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a triangular wave, obtaining a single triangular wave function at a preset frequency; Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in the single triangular wave function are calculated to obtain the target triangular wave function that the wedge profile radius needs to satisfy.

3. The wedge profile design method of a flow pulsation generating device according to claim 1, characterized in that: The non-sinusoidal waveform function that the wedge profile radius needs to satisfy is obtained based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas, including: When the non-sinusoidal flow pulsation waveform required by the combustion chamber gas is a rectangular wave, obtaining a single rectangular wave function at a preset frequency; Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in the single rectangular wave function are calculated to obtain the target rectangular wave function that the wedge profile radius needs to satisfy.

4. The wedge profile design method of a flow pulsation generating device according to claim 1, characterized in that: After designing the profile of the wedge based on the non-sinusoidal waveform function to obtain the target profile of the wedge, the method includes: Adjusting the amplitude of the non-sinusoidal flow pulsation waveform to obtain an adjusted amplitude; After calculating the adjusted maximum critical flow and the adjusted minimum critical flow based on the adjusted amplitude, return to the step of obtaining the maximum flow area and the minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole on the critical orifice plate based on the maximum critical flow and the minimum critical flow, and the combustion chamber outlet static pressure and the combustion chamber outlet static temperature, until the adjusted target profile of the wedge is obtained.

5. The wedge profile design method of a flow pulsation generating device according to claim 2, characterized in that: The step of calculating the profile parameters in the single triangular wave function based on the minimum radius of the wedge and the maximum radius of the wedge to obtain the target triangular wave function that the wedge profile radius needs to satisfy comprises: Adjusting the preset frequency to obtain an adjusted frequency; Segmenting the single-fold triangular wave function based on the adjusted frequency to obtain multiple segments of single-fold triangular wave functions; Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in each section of the single triangular wave function are calculated to obtain the adjusted target triangular wave function that the wedge profile radius needs to satisfy.

6. The wedge profile design method for a flow pulsation generating device according to claim 3, characterized in that: The step of calculating the profile parameters in the single rectangular wave function based on the minimum radius of the wedge and the maximum radius of the wedge to obtain the target rectangular wave function that the wedge profile radius needs to satisfy comprises: Adjusting the preset frequency to obtain an adjusted frequency; Segmenting the single rectangular wave function based on the adjusted frequency to obtain multiple segments of single rectangular wave functions; Based on the minimum radius of the wedge and the maximum radius of the wedge, the profile parameters in each section of the single rectangular wave function are calculated to obtain the adjusted target rectangular wave function that the wedge profile radius needs to satisfy.

7. A wedge profile design device for a flow pulsation generating device, characterized in that: include: A flow area calculation module is used to obtain a maximum flow area and a minimum flow area of ​​the combustion chamber gas flowing through the nozzle hole on the critical orifice plate based on a maximum critical flow rate and a minimum critical flow rate of the combustion chamber gas flowing through the nozzle hole, and a combustion chamber outlet static pressure and a combustion chamber outlet static temperature; A nozzle radius calculation module, used to: obtain the radius of the nozzle based on the maximum flow area and the minimum wedge radius; the minimum wedge radius is a preset radius of the wedge cross section in the same plane as the nozzle when the nozzle is at the maximum flow area; a wedge radius calculation module, for obtaining a maximum wedge radius based on the minimum flow area and the radius of the nozzle hole; the maximum wedge radius is a target radius of a wedge cross section in the same plane as the nozzle hole when the nozzle hole is in the minimum flow area; A profile function determination module, used to obtain a non-sinusoidal waveform function that the wedge profile radius needs to satisfy based on the minimum radius of the wedge, the maximum radius of the wedge and the non-sinusoidal flow pulsation waveform required by the combustion chamber gas; A wedge profile design module is used to: design the profile of the wedge based on the non-sinusoidal waveform function to obtain a target profile of the wedge; The critical orifice and the wedge are arranged in a flow pulsation generating device, the critical orifice is arranged downstream of the outlet of the combustion chamber, and the wedge reciprocates in the nozzle hole to change the flow area of ​​the combustion chamber gas flowing through the nozzle hole.

8. An electronic device comprising a processor and a memory storing a computer program, characterized in that: When the processor executes the computer program, the steps of the wedge profile design method for a flow pulsation generating device according to any one of claims 1 to 6 are implemented.

9. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the wedge profile design method for a flow pulsation generating device according to any one of claims 1 to 6 are implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the wedge profile design method for a flow pulsation generating device according to any one of claims 1 to 6 are implemented.

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