Method, device, equipment and storage medium for determining blowing momentum

Abstract

The present application provides a method, device, equipment and storage medium for determining blowing momentum, which relates to the field of jet control technology. The method predetermines the rate of change of the height of the nozzle gap with the current cavity pressure. When determining the blowing momentum, the current nozzle gap height can be determined according to the current cavity pressure and the rate of change of height, and then the blowing momentum is determined. Since the cavity pressure is different under different jet flow conditions, the nozzle gap height will change under the influence of the cavity pressure. The current nozzle gap height is determined using the current cavity pressure and the rate of change of height. The current nozzle gap height is more accurate, and the blowing momentum determined by the current nozzle gap height is also more accurate, which can improve the accuracy and reliability of the blowing momentum.

Description

Technical Field

[0001] The present application relates to the field of jet control technology, and in particular to a method, device, equipment and storage medium for determining blowing momentum. Background Art

[0002] In the aircraft active flow control technology (Active Flow Control), the basic principle of the jet (blowing) flow control technology is: compressed air enters the jet controller and forms a high-speed jet through a narrow nozzle. In this process, the pressure energy of the compressed air is converted into the kinetic energy of the jet. By injecting momentum into a specific flow field, the flow separation generated by the aircraft can be suppressed and the flow attachment can be promoted, thereby greatly improving its aerodynamic performance. In order to accurately evaluate the control effect and air consumption of the jet flow control technology, it is necessary to reduce the aircraft according to a certain ratio, and obtain accurate data based on the wind tunnel test and flight verification of the scaled model. Among them, the blowing momentum coefficient (Blowing momentum coefficient) is the most important dimensionless parameter. During the test, the parameters in the jet controller cavity can be measured, and the jet velocity and blowing momentum of the nozzle can be calculated, and then the blowing momentum coefficient can be obtained. Calculating the blowing momentum is the key. The current traditional methods mainly include:

[0003] (1) Measure the pressure, temperature and mass flow rate in the jet cavity, and measure the atmospheric pressure (ambient pressure), obtain the jet velocity according to the one-dimensional isentropic relationship of gas dynamics, and calculate the blowing momentum according to the mass flow rate and jet velocity. The advantage of this method is that the data accuracy is high, and the height of the nozzle does not need to be considered during calculation. The significant disadvantage of this method is that the test difficulty and cost are high. For the distributed jet flow control test, there are a large number of jet controllers, and a multi-channel flow control device needs to be developed during the test (the flow control device can refer to the invention patent CN104949816B). In the literature disclosed in this field, it has been reported that the multi-channel flow control device generally has 4 to 10 channels and can supply air to 4 to 10 jet controllers at the same time. On this basis, the difficulty and cost of continuing to increase the number of channels of the flow control device will increase sharply. In addition, even if a flow control device with a sufficient number of channels can be developed, due to the limited internal space of the scaled model, it is impossible to install a bulky air supply pipeline system, let alone the flow control device itself.

[0004] (2) Measure the pressure and temperature in the jet cavity, measure the nozzle height, measure the atmospheric pressure, and obtain the jet velocity and mass flow rate according to the isentropic relationship, and then obtain the blowing momentum. The advantage of this method is that the test cost is low, because there is no need to measure the flow through each jet controller, that is, there is no need to develop a multi-channel flow control device. In this method, the nozzle height is the key parameter for calculating the blowing momentum. It is necessary to first determine the mass flow rate based on the nozzle height and then determine the blowing momentum. In the scaled model test of jet flow control technology, the nozzle height is generally millimeter level or even sub-millimeter level. It is almost impossible to directly measure the height of such a narrow nozzle. Generally, the design value is used instead of the measured value. In addition, due to the structural characteristics of the jet cavity-nozzle, the nozzle height will change with the change of the jet flow control working conditions during the test, resulting in a large error introduced by the nozzle height. The blowing momentum determined based on the nozzle height is less accurate. Summary of the invention

[0005] The present application provides a method, device, equipment and storage medium for determining blowing momentum, which can improve the accuracy and reliability of blowing momentum.

[0006] The present application provides a method for determining blowing momentum, comprising:

[0007] Get the current cavity pressure, total temperature, and current atmospheric pressure;

[0008] Determine the current nozzle height based on the initial nozzle height, the predetermined height change rate, and the current cavity pressure, wherein the initial nozzle height is the nozzle height when the current cavity pressure is 0, and the height change rate is the rate of change of the nozzle height with the current cavity pressure;

[0009] Determine the mass flow rate of the jet based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure;

[0010] The blowing momentum is determined according to the mass flow rate of the jet.

[0011] In one embodiment of the present application, the mass flow rate of the jet is determined based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure, including:

[0012] Determining a jet Mach number according to the current cavity pressure and the current atmospheric pressure;

[0013] determining a jet temperature based on the jet Mach number and the total temperature;

[0014] determining a jet velocity according to the jet temperature and the jet Mach number;

[0015] determining a jet density based on the current atmospheric pressure and the jet temperature;

[0016] The mass flow rate of the jet is determined according to the jet density, the jet velocity, the current nozzle height, and a preset nozzle width.

[0017] In one embodiment of the present application, the blowing momentum is determined according to the mass flow rate of the jet, including:

[0018] The product of the mass flow rate of the jet and the jet velocity is determined as the blowing momentum.

[0019] In one embodiment of the present application, based on the initial spray gap height, the predetermined height change rate, and the current cavity pressure, the method further includes:

[0020] Acquire multiple groups of measurement data corresponding to different working conditions, each group of measurement data including cavity pressure, total temperature, atmospheric pressure, and mass flow rate;

[0021] Based on each set of measurement data, determine the spray seam height corresponding to each set of measurement data;

[0022] The cavity pressure and nozzle height of each set of measurement data are fitted to determine the height change rate and initial nozzle height.

[0023] In one embodiment of the present application, the value range of the cavity pressure in each group of the measurement data is the first value interval or the second value interval;

[0024] Among them, the minimum threshold of the first value interval is the product of the standard atmospheric pressure and the first preset value, the maximum threshold of the first value interval is the product of the standard atmospheric pressure and the second preset value, the minimum threshold of the second value interval is the product of the maximum experimental pressure and the third preset value, and the maximum threshold of the second value interval is the product of the maximum experimental pressure and the fourth preset value.

[0025] To achieve the above objectives and other related objectives, the present application provides a device for determining blowing momentum, comprising:

[0026] Data acquisition module, used to obtain the current cavity pressure, total temperature, and current atmospheric pressure;

[0027] A first processing module is used to determine a current nozzle height based on an initial nozzle height, a predetermined height change rate, and the current cavity pressure, wherein the initial nozzle height is the nozzle height when the current cavity pressure is 0, and the height change rate is the rate of change of the nozzle height with the current cavity pressure;

[0028] A second processing module is used to determine the mass flow rate of the jet based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure;

[0029] The third processing module is used to determine the blowing momentum according to the mass flow rate of the jet.

[0030] In one embodiment of the present application, the second processing module includes:

[0031] A first processing unit, configured to determine a jet Mach number according to the current cavity pressure and the current atmospheric pressure;

[0032] a second processing unit, configured to determine a jet temperature based on the jet Mach number and the total temperature;

[0033] a third processing unit, configured to determine a jet velocity according to the jet temperature and the jet Mach number;

[0034] a fourth processing unit, configured to determine a jet density based on the current atmospheric pressure and the jet temperature;

[0035] The fifth processing unit is used to determine the mass flow rate of the jet according to the jet density, the jet velocity, the current nozzle height, and a preset nozzle width.

[0036] In one embodiment of the present application, the third processing module is further used for:

[0037] The product of the mass flow rate of the jet and the jet velocity is determined as the blowing momentum.

[0038] As described above, the present application provides a method, device, equipment and storage medium for determining blowing momentum, which have the following beneficial effects:

[0039] A method for determining blowing momentum in the present application predetermines the rate of change of the height of the nozzle gap with the current cavity pressure. When determining the blowing momentum, the current nozzle gap height can be determined according to the current cavity pressure and the rate of change of height, and then the blowing momentum is determined. Since the cavity pressure is different under different jet flow conditions, the nozzle gap height will change under the influence of the cavity pressure. The current nozzle gap height is determined using the current cavity pressure and the rate of change of height. The current nozzle gap height is relatively accurate, and the blowing momentum determined by the current nozzle gap height is also relatively accurate, which can improve the accuracy and reliability of the blowing momentum.

[0040] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0042] Figure 1 is a flow chart of a method for determining blowing momentum shown in an exemplary embodiment of the present application;

[0043] Figure 2 is a schematic diagram of a jet control system shown in an exemplary embodiment of the present application;

[0044] Figure 3 is a schematic diagram of a spray seam structure shown in an exemplary embodiment of the present application;

[0045] Figure 4 is a schematic diagram of a fluidic calibration system shown in an exemplary embodiment of the present application;

[0046] Figure 5 is a flow chart showing a method of determining a height change rate and an initial spray gap height according to an exemplary embodiment of the present application;

[0047] Figure 6 is a schematic diagram of a calibration result of a jet controller shown in an exemplary embodiment of the present application;

[0048] Figure 7 is a schematic diagram of calibration results of a jet controller shown in another exemplary embodiment of the present application;

[0049] Figure 8 is a structural block diagram of a device for determining blowing momentum shown in an exemplary embodiment of the present application.

[0050] Description of reference numerals:

[0051] 210. Valve; 220. Jet controller; 230. First pressure sensor; 240. Second pressure sensor; 250. Temperature sensor; 260. Data acquisition and analysis system; 470. Flow meter; 310. Rear of the main wing; 320. Flap; 330. Jet cavity; 340. Cover plate; 350. Spray seam. DETAILED DESCRIPTION

[0052] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0053] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0054] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0055] See also Figure 1 , Figure 1 FIG. 1 is a flow chart of a method for determining blowing momentum according to an exemplary embodiment of the present application. Figure 1 It can be seen that the method for determining the blowing momentum may include:

[0056] Step S110, obtaining the current cavity pressure, total temperature, and current atmospheric pressure.

[0057] In one embodiment of the present application, the current cavity pressure, total temperature, and current atmospheric pressure can be obtained. A temperature sensor can be installed in the jet cavity to measure the temperature in the jet cavity, and the measured temperature in the jet cavity is determined as the total temperature. A pressure sensor can be installed in the jet cavity to obtain the current cavity pressure. The current atmospheric pressure can be obtained by a barometer.

[0058] For example, see Figure 2, which is a schematic diagram of a jet control system shown in an exemplary embodiment of the present application. The jet control system includes a valve 210, a jet controller 220, a first pressure sensor 230, a second pressure sensor 240, a temperature sensor 250, and a data acquisition and analysis system 260. The direction of the arrow indicates the flow direction of the jet. The valve 210 is used to control the flow rate of the jet, the first pressure sensor 230 can be used to measure the current atmospheric pressure, the second pressure sensor 240 can be used to measure the current cavity pressure, the temperature sensor 250 can be used to measure the total temperature, and the data acquisition and analysis system 260 can be used to determine the blowing momentum. The jet controller 220 is mainly composed of an air intake pipe, a diffusion section, a cover plate and a jet cavity. Its working principle is: compressed air enters the jet controller through the air intake pipe, forms a jet at the nozzle, and is injected into a specific position of the flap. In this process, the pressure energy of the compressed air is converted into the kinetic energy of the jet.

[0059] The jet controller is set between the air supply system and the target flow field, and converts the pressure energy of compressed air into the kinetic energy of the jet. In order to evaluate its flow control effect, it is necessary to accurately grasp the momentum injected by the jet controller into the target flow field, that is, to measure the jet flow and speed. The applicant found in the study that for the distributed jet flow control test, there are a large number of jet controllers, and it is very costly and difficult to measure the flow of each jet controller at the same time, because it is necessary to set up a multi-channel flow control device in the air supply system; if the flow is not measured directly, it is almost impossible to directly measure the height of the nozzle. If the design value of the nozzle height is used, the relevant measurement results will have a large error, because the nozzle height is at the millimeter level or even sub-millimeter level, and the nozzle will produce a certain deformation during operation. Based on this, an embodiment of the present application provides a method for determining the blowing momentum. Based on the elastic deformation assumption, it is believed that the nozzle height and the jet cavity pressure are linearly related when the jet controller is in a working state. Therefore, the jet controller can be calibrated before determining the blowing momentum, and the linear relationship between the nozzle height and the jet cavity pressure can be mastered. When used formally, there is no need to use a multi-channel flow control device, and the blowing momentum can be calculated more accurately.

[0060] Step S120, determining the current nozzle height based on the initial nozzle height, the predetermined height change rate, and the current cavity pressure.

[0061] The initial nozzle height is the nozzle height when the current cavity pressure is 0, and the height change rate is the rate of change of the nozzle height with the current cavity pressure.

[0062] In one embodiment of the present application, the current nozzle height can be determined based on the initial nozzle height, the predetermined height change rate, and the current cavity pressure. The product of the height change rate and the current cavity pressure can be determined as the height change value, and the sum of the initial nozzle height and the height change value can be determined as the current nozzle height.

[0063] For example, see Figure 3 , which is a schematic diagram of a spraying slot structure shown in an exemplary embodiment of the present application. Figure 3 It can be seen that the spray seam structure may include the rear part 310 of the main wing, the flap 320, the jet cavity 330, and the cover plate 340. The spray seam 350 is located between the cover plate 340 and the aircraft surface (including the rear part 310 of the main wing and the flap 320). The pressure of the jet cavity 330 is the cavity pressure. The jet flows from the jet cavity 330 to the outside through the spray seam. The height of the spray seam 350 is the spray seam height. When there is no jet, the distance between the cover plate and the aircraft surface is the initial spray seam height. As the pressure of the jet cavity changes, the cover plate may be displaced due to the reaction force of the jet, thereby changing the spray seam height.

[0064] It should be noted that the current spray gap height in the embodiment of the present application is obtained based on the current cavity pressure and the predetermined height change rate, with high accuracy; there is no need to use a pre-set fixed value as the spray gap height, and the reliability of the current spray gap height is high; there is no need to measure the spray gap height during actual use, which can save time and cost.

[0065] Step S130, determining the mass flow rate of the jet based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure.

[0066] In one embodiment of the present application, the mass flow rate of the jet can be determined based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure. The designer can pre-set the nozzle width value according to the design requirements.

[0067] Step S140, determining the blowing momentum according to the mass flow rate of the jet.

[0068] In one embodiment of the present application, the product of the mass flow rate of the jet and the jet velocity can be determined as the blowing momentum. Determining the blowing momentum (BlowingMomentum) plays an important role in the design analysis of the aircraft. The blowing momentum is an important parameter of the jet, which describes the influence of the jet on the surrounding flow field. The jet velocity can be determined according to the current cavity pressure and the current atmospheric pressure.

[0069] It should be noted that by blowing air on the trailing edge or suction surface of the airfoil, the separation of the boundary layer can be delayed, the formation of the separation area can be reduced, and thus the drag can be reduced. The value of the blowing momentum determines the effect of the blowing. Too small a momentum may not effectively delay the separation, and too large a momentum may cause other problems. Blowing air on the leading edge or upper surface of the airfoil can enhance the stability of the boundary layer and increase lift. The value of the blowing momentum determines the amount of lift increase. By blowing air at the wing tip or other key parts, vortices can be generated, flow stability can be improved, and induced drag can be reduced. The value of the blowing momentum determines the intensity and distribution of the vortex. By blowing air at specific locations on the engine nozzle or wing surface, the direction of the thrust can be changed to achieve attitude control and enhanced maneuverability of the aircraft. The value of the blowing momentum determines the magnitude of the change in thrust direction.

[0070] Therefore, by determining the blowing momentum, the design indicators of the aircraft, such as dynamic stability, thrust vector control, flow control, and noise control, can be judged. Accurate blowing momentum can improve the accuracy of analysis and judgment.

[0071] In a possible implementation, step S130 is a process of determining the mass flow rate of the jet based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure, and may include steps S131 to S135.

[0072] Step S131, determining the jet Mach number according to the current cavity pressure and the current atmospheric pressure.

[0073] In one embodiment of the present application, the jet Mach number can be determined according to the current cavity pressure and the current atmospheric pressure. The jet Mach number can more accurately describe the compressibility effect of the fluid, thereby more accurately calculating the mass flow rate.

[0074] Exemplarily, the jet Mach number may be determined according to a first formula, which may be as follows:

[0075] ;

[0076] in, is the current cavity pressure, is the current atmospheric pressure, is the specific heat ratio, which is generally taken as 1.4 for air. is the jet Mach number.

[0077] Step S132, determining the jet temperature based on the jet Mach number and the total temperature.

[0078] In one embodiment of the present application, the jet temperature may be determined based on the established Mach number and the total temperature.

[0079] Exemplarily, the jet temperature may be determined according to a second formula, which may be as follows:

[0080] ;

[0081] in, is the total temperature, is the jet temperature.

[0082] Step S133, determining the jet velocity according to the jet temperature and the jet Mach number.

[0083] In one embodiment of the present application, the jet velocity can be determined based on the jet temperature and the jet Mach number. To determine the jet velocity, the mass flow rate is the mass of fluid passing through a certain cross section per unit time, so accurately determining the jet velocity is the basis for calculating the mass flow rate.

[0084] Exemplarily, the jet velocity may be determined according to the third formula and the fourth formula, and the third formula may be as follows:

[0085] ;

[0086] in, is the local sound velocity of the jet, is the gas constant, which is usually taken as 287 for air;

[0087] The fourth formula can be shown as follows:

[0088] ;

[0089] in, is the jet velocity.

[0090] Step S134, determining the jet density based on the current atmospheric pressure and the jet temperature.

[0091] In one embodiment of the present application, the jet density may be determined based on the current atmospheric pressure and the jet temperature.

[0092] Exemplarily, the jet density may be determined according to the fifth formula, which may be as follows:

[0093] ;

[0094] in, is the jet density.

[0095] Step S135, determining the mass flow rate of the jet according to the jet density, the jet velocity, the current nozzle height, and the preset nozzle width.

[0096] In one embodiment of the present application, the product of the jet density, the jet velocity, the current nozzle height, and the preset nozzle width can be determined as the mass flow rate of the jet.

[0097] For example, see Figure 4 , which is a schematic diagram of a jet calibration system shown in an exemplary embodiment of the present application. The jet calibration system includes a valve 210, a jet controller 220, a first pressure sensor 230, a second pressure sensor 240, a temperature sensor 250, a data acquisition and analysis system 260, and a flow meter 470. The direction of the arrow indicates the flow direction of the jet. The valve 210 is used to control the flow rate of the jet, the first pressure sensor 230 can be used to measure the current atmospheric pressure, the second pressure sensor 240 can be used to measure the current cavity pressure, the temperature sensor 250 can be used to measure the total temperature, the data acquisition and analysis system 260 can be used to determine the blowing momentum, and the flow meter 470 can be used to measure the mass flow rate of the jet.

[0098] See also Figure 5 , which is a flow chart of determining the height change rate and the initial spray gap height shown in an exemplary embodiment of the present application. In a possible implementation, before executing step S120, the method for determining the blowing momentum provided in the embodiment of the present application may also include steps S210 to S230.

[0099] Step S210, obtaining multiple groups of measurement data corresponding to different working conditions.

[0100] Each set of measurement data includes cavity pressure, total temperature, atmospheric pressure, and mass flow rate.

[0101] In one embodiment of the present application, different working conditions correspond to different cavity pressures, total temperatures, atmospheric pressures, and mass flow rates. When performing data calibration, the jet controller can be installed before the test, and ventilation debugging and data measurement can be performed; ventilation debugging is to input a series of flow rates of compressed air into the jet controller; and measurement data is to measure cavity pressures, total temperatures, mass flow rates, and atmospheric pressures under different working conditions.

[0102] In a possible implementation manner, the value range of the cavity pressure in each set of measurement data is the first value interval or the second value interval;

[0103] Among them, the minimum threshold of the first value interval is the product of the standard atmospheric pressure and the first preset value, the maximum threshold of the first value interval is the product of the standard atmospheric pressure and the second preset value, the minimum threshold of the second value interval is the product of the maximum experimental pressure and the third preset value, and the maximum threshold of the second value interval is the product of the maximum experimental pressure and the fourth preset value.

[0104] It should be noted that the first preset value and the third preset value may be the same or different, and the second preset value and the fourth preset value may be the same or different. Setting the value range of the cavity pressure can cover as many possible practical usage situations as possible while reducing experimental data.

[0105] Exemplarily, the first preset value and the third preset value may be 0.2, and the second preset value and the fourth preset value may be 0.8.

[0106] Step S220, based on each set of measurement data, determine the spray seam height corresponding to each set of measurement data.

[0107] In one embodiment of the present application, the spray gap height corresponding to each set of measurement data may be determined based on each set of measurement data. The spray gap height corresponding to each set of measurement data may be determined according to the first to fifth formulas described above.

[0108] Step S230, performing data fitting on the cavity pressure and nozzle height of each set of measurement data to determine the height change rate and the initial nozzle height.

[0109] In one embodiment of the present application, linear fitting software can be used to perform data fitting on the cavity pressure and nozzle height of each set of measurement data to determine the height change rate and the initial nozzle height.

[0110] The fitted relationship can be shown as follows:

[0111] ;

[0112] in, is the current spray joint height, is the initial spray gap height, is the rate of change of altitude, is the current cavity pressure.

[0113] It should be noted that the method for determining the blowing momentum provided in the embodiment of the present application can bring at least the following benefits: (1) The blowing momentum can be obtained without using a multi-channel flow control device, which is conducive to reducing the complexity of the test and reducing the test cost; (2) According to the a priori cavity pressure-spray seam height linear relationship, the blowing momentum can be calculated more accurately, which is conducive to improving the accuracy of the measured data. In addition, in the present invention, only one (set) flow measurement device is needed to complete the calibration of all jet controllers in sequence. During the formal test, the jet cavity pressure, temperature and atmospheric pressure of all jet controllers can be measured simultaneously. The technical solution has controllable cost, simple operation and strong feasibility.

[0114] For example, see Figure 6 , which is a schematic diagram of the calibration results of the jet controller shown as an exemplary embodiment of the present application. Figure 6 The design nozzle height of the corresponding jet controller is 0.5 mm. Due to differences in process and other reasons, the initial nozzle height is less than 0.5 mm. Figure 6 In the calibration result diagram shown, the horizontal axis is the cavity pressure of the jet (in kPa), and the vertical axis is the nozzle height (in mm). It can be seen that the linear fitting result of the nozzle height of the jet controller-jet cavity pressure is good, and its goodness of fit is =0.99.

[0115] For example, see Figure 7 , which is a schematic diagram of the calibration results of the jet controller shown in another exemplary embodiment of the present application. Figure 7 The design nozzle height of the corresponding jet controller is 0.8 mm. Due to differences in process and other reasons, the initial nozzle height is less than 0.8 mm. Figure 7 In the calibration result diagram shown, the horizontal axis is the cavity pressure of the jet (in kPa), and the vertical axis is the nozzle height (in mm). It can be seen that the linear fitting result of the nozzle height of the jet controller-jet cavity pressure is good, and its goodness of fit is =0.96.

[0116] Figure 8 FIG. 1 is a block diagram of a device for determining the blowing momentum according to an exemplary embodiment of the present application. Figure 8 As shown, the exemplary blowing momentum determination device 800 includes:

[0117] The data acquisition module 810 is used to obtain the current cavity pressure, total temperature, and current atmospheric pressure.

[0118] The first processing module 820 is used to determine the current spray gap height based on the initial spray gap height, a predetermined height change rate, and the current cavity pressure. The initial spray gap height is the spray gap height when the current cavity pressure is 0, and the height change rate is the rate at which the spray gap height changes with the current cavity pressure.

[0119] The second processing module 830 is used to determine the mass flow rate of the jet based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure.

[0120] The third processing module 840 is used to determine the blowing momentum according to the mass flow rate of the jet.

[0121] In one embodiment of the present application, the second processing module includes:

[0122] A first processing unit, configured to determine a jet Mach number according to the current cavity pressure and the current atmospheric pressure;

[0123] a second processing unit, configured to determine a jet temperature based on the jet Mach number and the total temperature;

[0124] a third processing unit, configured to determine a jet velocity according to the jet temperature and the jet Mach number;

[0125] a fourth processing unit, configured to determine a jet density based on the current atmospheric pressure and the jet temperature;

[0126] The fifth processing unit is used to determine the mass flow rate of the jet according to the jet density, the jet velocity, the current nozzle height, and a preset nozzle width.

[0127] In one embodiment of the present application, the third processing module is further used for:

[0128] The product of the mass flow rate of the jet and the jet velocity is determined as the blowing momentum.

[0129] It should be noted that the blowing momentum determination device provided in the above embodiment and the blowing momentum determination method provided in the above embodiment belong to the same concept, wherein the specific manner in which each module and unit performs the operation has been described in detail in the method embodiment, and will not be repeated here. In practical applications, the blowing momentum determination device provided in the above embodiment can allocate the above functions to different functional modules as needed, that is, divide the internal structure of the device into different functional modules to complete all or part of the functions described above, and this is not limited here.

[0130] An embodiment of the present application further provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the electronic device implements the blowing momentum determination method provided in the above-mentioned embodiments.

[0131] Another aspect of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor of a computer, the computer executes the method for determining the blowing momentum provided in the above-mentioned embodiments. The computer-readable storage medium may be included in the electronic device described in the above-mentioned embodiments, or may exist independently without being assembled into the electronic device.

[0132] Another aspect of the present application also provides a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the blowing momentum determination method provided in each of the above embodiments.

[0133] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. "Including" and "comprising" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to".

[0134] The above embodiments are merely illustrative of the principles and effects of the present application, and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A method for determining blowing momentum, characterized in that: include: Get the current cavity pressure, total temperature, and current atmospheric pressure; Determine the current nozzle height based on the initial nozzle height, the predetermined height change rate, and the current cavity pressure, wherein the initial nozzle height is the nozzle height when the current cavity pressure is 0, and the height change rate is the rate of change of the nozzle height with the current cavity pressure; Determine the mass flow rate of the jet based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure; Determine the blowing momentum based on the mass flow rate of the jet; Based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure, the mass flow rate of the jet is determined, including: determining the jet Mach number according to the current cavity pressure and the current atmospheric pressure; determining the jet temperature based on the jet Mach number and the total temperature; determining the jet velocity according to the jet temperature and the jet Mach number; determining the jet density based on the current atmospheric pressure and the jet temperature; determining the mass flow rate of the jet according to the jet density, the jet velocity, the current nozzle height, and the preset nozzle width; Determining the blowing momentum according to the mass flow rate of the jet includes: determining the product of the mass flow rate of the jet and the jet velocity as the blowing momentum.

2. The method for determining the blowing momentum according to claim 1, characterized in that: Based on the initial spray gap height, the predetermined height change rate, and the current cavity pressure, the method further includes: Acquire multiple groups of measurement data corresponding to different working conditions, each group of measurement data including cavity pressure, total temperature, atmospheric pressure, and mass flow rate; Based on each set of measurement data, determine the spray seam height corresponding to each set of measurement data; The cavity pressure and nozzle height of each set of measurement data are fitted to determine the height change rate and initial nozzle height.

3. The method for determining the blowing momentum according to claim 2, characterized in that: The value range of the cavity pressure in each group of the measurement data is the first value interval or the second value interval; Among them, the minimum threshold of the first value interval is the product of the standard atmospheric pressure and the first preset value, the maximum threshold of the first value interval is the product of the standard atmospheric pressure and the second preset value, the minimum threshold of the second value interval is the product of the maximum experimental pressure and the third preset value, and the maximum threshold of the second value interval is the product of the maximum experimental pressure and the fourth preset value.

4. A device for determining blowing momentum, characterized in that: include: Data acquisition module, used to obtain the current cavity pressure, total temperature, and current atmospheric pressure; A first processing module is used to determine a current nozzle height based on an initial nozzle height, a predetermined height change rate, and the current cavity pressure, wherein the initial nozzle height is the nozzle height when the current cavity pressure is 0, and the height change rate is the rate of change of the nozzle height with the current cavity pressure; A second processing module is used to determine the mass flow rate of the jet based on the current nozzle height, the preset nozzle width, the current cavity pressure, the total temperature, and the current atmospheric pressure; A third processing module is used to determine the blowing momentum according to the mass flow rate of the jet; The second processing module includes: a first processing unit, used to determine the jet Mach number according to the current cavity pressure and the current atmospheric pressure; a second processing unit, used to determine the jet temperature based on the jet Mach number and the total temperature; a third processing unit, used to determine the jet velocity according to the jet temperature and the jet Mach number; a fourth processing unit, used to determine the jet density based on the current atmospheric pressure and the jet temperature; a fifth processing unit, used to determine the mass flow rate of the jet according to the jet density, the jet velocity, the current nozzle height, and a preset nozzle width; The third processing module is further used to determine the product of the mass flow rate of the jet and the jet velocity as the blowing momentum.

5. An electronic device, characterized in that: The electronic device comprises: one or more processors; a memory for storing program code executable by the processor; The processor is configured to execute the program code to implement the method for determining the blowing momentum according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that: When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the method for determining the blowing momentum according to any one of claims 1 to 3.

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