Aerodynamic equipment and method for controlling flow field of blade tip area of aerodynamic equipment

Abstract

The invention discloses gas power equipment and a method for controlling a flow field of a blade tip area of the gas power equipment, the gas power equipment is a transonic speed fan or a gas compressor based on axial flow, and the gas power equipment comprises a casing, a DBD plasma exciter, a movable blade, a first insulating medium, an alternating current power supply and a second insulating medium; a first insulating medium is arranged on the inner wall of the cartridge receiver to form an annular insulating medium, a positive electrode of the DBD plasma exciter is arranged in the first insulating medium to form an annular positive electrode, the annular positive electrode and the inner wall of the cartridge receiver are isolated by the first insulating medium, and the annular positive electrode is located at the upstream of shock waves; the moving blade is used as a negative electrode, a second insulating medium is arranged at the tip of the moving blade, the positive electrode and the negative electrode are isolated by the second insulating medium, and the alternating current power supply is connected with the positive electrode and the negative electrode of the DBD plasma exciter respectively, so that the DBD plasma exciter generates plasma. According to the technical scheme provided by the invention, the working performance of the gas power equipment under all working conditions can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fluid mechanics, and in particular to a gas power device and a method for controlling a flow field in a blade tip region of the gas power device. Background Art

[0002] Fans and compressors are gas-powered devices that rely on gas dynamics principles (such as aerodynamics principles) to act on the air through the movement of mechanical parts to achieve air flow and pressurization. Fans and compressors can be widely used in fields such as aircraft engines and gas turbines, and fans and compressors will have a great impact on the efficient and stable operation of engines and other equipment. For example, the new generation of variable cycle engines often need to take into account both high thrust-to-weight ratio and low fuel consumption rate, which requires variable cycle engines to have reliable bypass regulation capabilities. As the front-end component of the engine, the compressor needs to have a wide flow regulation capability and a stable working margin to meet the bypass regulation requirements of the engine. This brings new challenges to the aerodynamic structure design of the compressor, that is, how to make gas-powered equipment have a wide flow regulation capability and a stable working margin is a technical issue worthy of attention. Summary of the invention

[0003] In order to solve the above technical problems, the present disclosure is proposed. The embodiments of the present disclosure provide a gas power device and a method for controlling the flow field in the blade tip area of ​​the gas power device.

[0004] According to a first aspect of an embodiment of the present disclosure, a gas power device is provided, which is a transonic fan or compressor based on axial flow, and the gas power device includes: a casing, a dielectric barrier discharge (DBD) plasma actuator, a plurality of moving blades, a first insulating medium, an AC power supply, and a second insulating medium, and the DBD plasma actuator, the plurality of moving blades, the first insulating medium, the AC power supply, and the second insulating medium are all arranged in the casing; a first insulating medium is arranged on the inner wall of the casing, and the first insulating medium is arranged along the rotation circumference of the moving blade to form an annular insulating medium, and the annular insulating medium is opposite to the blade tip of the moving blade; the positive electrode of the DBD plasma actuator is arranged along the rotation circumference of the moving blade to form an annular positive electrode, The annular positive electrode is arranged in the first insulating medium, and the annular positive electrode is isolated from the inner wall of the casing by the first insulating medium. The annular positive electrode is located upstream of the shock wave formed by the moving blade, and the upstream is the upstream based on the incoming flow direction of the gas power device; the moving blade is used as the negative electrode of the DBD plasma actuator, and the tip of the moving blade is provided with a second insulating medium, and the positive electrode and the negative electrode of the DBD plasma actuator are isolated by the second insulating medium; the AC power supply is respectively connected to the positive electrode and the negative electrode of the DBD plasma actuator, and is used to provide power for the DBD plasma actuator, so that the DBD plasma actuator generates plasma, and the plasma reacts with the shock wave formed by the rotation of the moving blade.

[0005] According to a second aspect of an embodiment of the present disclosure, a method for controlling a flow field in a tip region of a gas power device is provided, comprising: determining a position of a shock wave generated by a moving blade of a rotor of the gas power device in the axial direction of the rotor; wherein the gas power device is a transonic fan or compressor based on axial flow; upstream of the position, along the rotational circumference of the moving blade, a positive electrode of a DBD plasma actuator is arranged in a first insulating medium to form an annular positive electrode; wherein the first insulating medium is arranged on the inner wall of a casing of the gas power device along the rotational circumference of the moving blade to form an annular insulating medium, the annular insulating medium is opposite to the tip of the moving blade, the first insulating medium isolates the annular positive electrode from the inner wall of the casing, and the upstream is an upstream based on the incoming flow direction of the gas power device; a second insulating medium is arranged on the tip of the moving blade, and the positive electrode and the negative electrode of the DBD plasma actuator are isolated by the second insulating medium; wherein the moving blade is used as the negative electrode of the DBD plasma actuator; and the rotor operating characteristic parameters of the gas power device are verified by experiments or numerical simulations.

[0006] Based on the above embodiments of the present disclosure, a gas power device and a method for controlling the flow field in the blade tip area of ​​the gas power device are provided. By arranging an annular insulating medium on the inner wall of the casing of the gas power device and arranging the positive electrode of the DBD plasma exciter on the annular insulating medium, the annular positive electrode of the DBD plasma exciter can be simply and conveniently formed in the casing; by using the moving blade as the negative electrode of the DBD plasma exciter and arranging a second insulating medium at the tip position of the moving blade, not only can the negative electrode of the DBD plasma exciter be set without setting an additional negative electrode element in the casing, but it is also beneficial to concentrate the plasma generated by the DBD plasma exciter in the tip area of ​​the moving blade; by making the annular positive electrode at the inner wall of the casing of the gas power device It is located upstream of the shock wave formed by the moving blade in the axial direction, which is conducive to concentrating the plasma generated by the DBD plasma exciter in the shock wave area in the flow field of the tip area of ​​the moving blade, so as to make the plasma interact with the shock wave formed by the moving blade as much as possible, which is conducive to suppressing the tip leakage vortex to a large extent, reducing flow separation, and reducing the energy loss of the flow field in the tip area, thereby helping to weaken the impact of the shock wave on the flow field in the tip area to a large extent, which is conducive to accelerating the flow of gas in the tip area and avoiding surge phenomenon; after experiments and numerical simulations, it has been verified that the gas power equipment disclosed in the present invention can effectively improve its working characteristic parameters while ensuring the working margin of the gas power equipment under different working conditions. It can be seen that the technical solution provided by the present invention is simple and easy to improve the improvement measures for the gas power equipment, and the required energy consumption is low, and it is conducive to improving the working performance of the gas power equipment under all working conditions.

[0007] The technical solution of the present disclosure is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] By describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present disclosure will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. In the drawings, the same reference numerals generally represent the same components or steps.

[0009] Figure 1 It is a schematic diagram of the structure of the gas power device disclosed in the present invention; Figure 2 A schematic diagram of plasma excitation of a flow field in a tip region of a moving blade disclosed in the present invention; Figure 3 A flow chart of an embodiment of a method for controlling a flow field in a blade tip region of a gas power device disclosed in the present invention; Figure 4 A comparative schematic diagram of the working pressure ratio of the present invention; Figure 5 A comparative schematic diagram of the working efficiency of the present invention; Figure 6 A structural diagram of an electronic device provided as an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0010] The exemplary embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the exemplary embodiments described here.

[0011] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

[0012] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present disclosure are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0013] It should also be understood that in the embodiments of the present disclosure, “plurality” may refer to two or more than two, and “at least one” may refer to one, two, or more than two.

[0014] It should also be understood that any component, data or structure mentioned in the embodiments of the present disclosure can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0015] In addition, the term "and / or" in this disclosure is only a description of the association relationship of associated objects, indicating that there may be three relationships, such as A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this disclosure generally indicates that the associated objects before and after are in an "or" relationship.

[0016] It should also be understood that the description of the various embodiments in the present disclosure focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0017] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0018] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0019] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0020] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0021] The embodiments of the present disclosure can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate with many other general or special computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments and / or configurations suitable for use with electronic devices such as terminal devices, computer systems or servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, large computer systems, and distributed cloud computing technology environments including any of the above systems, etc.

[0022] Electronic devices such as terminal devices, computer systems, servers, etc. can be described in the general context of computer system executable instructions (such as program modules) executed by computer systems. Generally, program modules can include routines, programs, target programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment. In a distributed cloud computing environment, tasks can be performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0023] In the process of realizing the present disclosure, the inventors found that the tip area of ​​gas power equipment such as axial flow-based transonic fans and compressors is usually one of the parts with the most complex flow and the most concentrated energy loss. By controlling the flow field in the tip area of ​​the gas power equipment, it is beneficial to suppress the tip leakage vortex and reduce flow separation, thereby helping to expand the stable working margin of the gas power equipment. At present, the methods for controlling the flow field in the tip area of ​​gas power equipment include: casing treatment and boundary layer suction treatment. The casing treatment refers to changing the flow field distribution in the tip area by designing the inner wall of the casing of the gas power equipment into a specific structure such as a serrated or grooved shape, thereby weakening the strength of the tip leakage vortex and delaying the separation of the airflow flow. The boundary layer suction treatment refers to actively extracting the low-energy fluid in the boundary layer by opening small holes or slits on the suction surface of the blade or the wall of the casing to prevent it from accumulating in the tip area and causing flow separation. However, the casing treatment technology has problems such as complex structure, insufficient adaptability to operating conditions, tip clearance sensitivity and noise / vibration, while the boundary layer suction treatment technology has problems such as additional energy consumption, complex suction system structure, difficulty in suction parameter design and poor adaptability across operating conditions.

[0024] Although the use of plasma to control the flow field in the blade tip area has received attention in recent years, the existing technology of using plasma to control the flow field in the blade tip area often sacrifices the working efficiency and working pressure ratio of the gas power equipment in order to ensure the working margin of the gas power equipment, which is not conducive to improving the working performance of the gas power equipment.

[0025] The technical solution of the gas power equipment disclosed in the present invention can be applied to a variety of application scenarios, for example, it can be applied to application scenarios such as gas turbines for ground power generation and aircraft engine design.

[0026] In a specific example, the gas power equipment of an aircraft engine may include: an axial flow transonic fan (hereinafter referred to as the fan) and a transonic axial flow compressor (hereinafter referred to as the compressor), wherein the fan is usually arranged at the front end of the aircraft engine, and the compressor is usually arranged downstream of the fan, the fan and the compressor are connected in series, and the two work in coupling. The fan and the compressor in the aircraft engine may both adopt the structural features of the gas power equipment in the present disclosure, or only the fan or the compressor may adopt the structural features of the gas power equipment in the present disclosure. If the aircraft engine has a corresponding fixed value requirement for the working efficiency and the working pressure ratio, the working efficiency and the working pressure ratio of the fan at the front end can be improved based on the technical solution of the present disclosure, while the working efficiency and the working pressure ratio of the compressor at the rear end can be maintained or reduced. If the aircraft engine has no fixed value requirement for the working efficiency and the working pressure ratio (such as as large as possible), the working efficiency and the working pressure ratio of the fan at the front end and the compressor at the rear end can be effectively improved based on the technical solution of the present disclosure, so as to provide better power and working performance for the aircraft engine.

[0027] Figure 1 FIG. 1 is a schematic diagram of the structure of an embodiment of a gas powered device disclosed in the present invention. Figure 1 The gas power device shown is a gas power device based on axial flow, that is, an axial flow gas power device. The gas power device in the present disclosure refers to a device that uses air as a working medium and realizes a specific function through energy conversion. More specifically, the gas power device may refer to a device that utilizes the pressure energy, kinetic energy or internal energy of a gas to convert with mechanical energy to complete the compression, transportation, expansion work or power output of the gas. The gas power device in the present disclosure may specifically be a fan or a compressor, and the gas power device mainly includes: a casing 1, a DBD (Dielectric Barrier Discharge) plasma actuator, a plurality of moving blades 2, a first insulating medium 3, an AC power supply 4 and a second insulating medium 6. The following is combined with Figure 1 and Figure 2 Each component included in the gas powered device of the present disclosure is described separately.

[0028] Figure 1 The casing 1 is mainly used to accommodate components such as the DBD plasma actuator, the rotor (including components such as the moving blades 2), the stator (including components such as the stationary blades), the first insulating medium 3, the AC power supply 4 and the second insulating medium 6. The casing 1 is also used to seal the compressed gas in the channel.

[0029] A first insulating medium 3 is arranged on the inner wall of the casing 1, and the first insulating medium 3 is arranged along the rotation circumference of the moving blade 2, so that the shape of the first insulating medium 3 is annular, that is, the first insulating medium 3 can form an annular insulating medium. The annular insulating medium is opposite to the tip of the moving blade 2, that is, the distance between the annular insulating medium and the tip of the moving blade 2 can be considered as the tip gap. The width of the annular insulating medium formed by the first insulating medium 3 should be greater than the width of the positive electrode 5 of the DBD plasma actuator (for example, the width of the positive electrode 5 can be 2-3mm). For example, the width of the annular insulating medium can be at least twice the width of the positive electrode 5 of the DBD plasma actuator. The thickness of the annular insulating medium formed by the first insulating medium 3 is less than the wall thickness of the casing 1, and greater than the thickness of the positive electrode 5 of the DBD plasma actuator. For example, the thickness of the annular insulating medium can be about half of the wall thickness of the casing 1 and about twice the thickness of the positive electrode 5 of the DBD plasma actuator. In addition, the material of the first insulating medium 3 can be determined according to actual conditions such as temperature, pressure and voltage level in the gas power equipment. For example, the material of the first insulating medium 3 can be plastic or rubber or a composite material, etc. The present disclosure does not limit the material of the first insulating medium 3.

[0030] In one example, the first insulating medium 3 can be embedded in the inner wall of the casing 1, and the outer surface of the first insulating medium 3 is not higher than the inner wall of the casing 1, nor lower than the inner wall of the casing 1, that is, the first insulating medium 3 is flatly embedded in the inner wall of the casing 1. For example, Figure 1 The outer surface of the first insulating medium 3 is flush with the inner wall of the casing 1, which helps to prevent the moving blades 2 from contacting the first insulating medium 3 during the rotation process.

[0031] The DBD plasma actuator in the present disclosure includes an anode 5 and a cathode, and the anode 5 of the DBD plasma actuator is also arranged along the rotation circumference of the moving blade 2, thereby forming an annular anode, and the annular anode is arranged in the first insulating medium 3, so that the annular anode and the inner wall of the casing 1 are isolated by the first insulating medium 3, that is, the first insulating medium 3 is used to isolate the annular anode 5 and the inner wall of the casing 1. The anode 5 of the DBD plasma actuator can be implemented by a flat wire, such as the anode 5 can be implemented by a flat wire with a width of 2-3 mm.

[0032] The positive electrode 5 of the DBD plasma actuator is located upstream of the shock wave formed by the moving blade 2 in its axial direction. The shock wave formed by the moving blade 2 can be called a cascade channel shock wave (e.g. Figure 1 The axial direction of the positive electrode 5 of the DBD plasma actuator refers to: a direction perpendicular to the annular surface of the annular positive electrode 5, for example, a direction passing through the center of the annular surface formed by the positive electrode 5 of the DBD plasma actuator and perpendicular to the annular surface. Specifically, Figure 1 The flow direction in the horizontal direction is the axial direction of the anode 5 of the DBD plasma actuator. The upstream in the present disclosure refers to the upstream based on the flow direction of the gas power device, that is, the upstream based on the flow direction of the gas power device. Figure 1 For example, due to Figure 1 The incoming flow direction in is the horizontal direction from left to right. Therefore, for two points in the horizontal direction, the point on the left is located upstream of the point on the right. Since the annular positive electrode 5 is located upstream of the shock wave formed by the rotor blade 2, the DBD plasma exciter is based on the plasma formed by the annular positive electrode 5 (such as Figure 1 In the embodiment, the plasma region A) formed by the DBD plasma actuator can effectively act on the shock wave located downstream thereof, which is beneficial to avoid the influence of the shock wave on the flow field in the blade tip area.

[0033] In one example, the anode 5 of the DBD plasma actuator can be embedded in the first insulating medium 3, and the outer surface of the anode 5 of the DBD plasma actuator is usually not higher than the outer surface of the first insulating medium 3, nor lower than the outer surface of the first insulating medium 3, that is, the anode 5 of the DBD plasma actuator is flatly embedded in the first insulating medium 3. For example, Figure 1 The outer surface of the positive electrode 5 of the DBD plasma actuator is flush with the outer surface of the first insulating medium 3, which helps to prevent the moving blade 2 from contacting the positive electrode 5 of the DBD plasma actuator during rotation.

[0034] In one example, the distance between the positive electrode 5 of the DBD plasma actuator and the shock wave generated by the moving blade 2 in the axial direction can be 0 to 10 mm (millimeter). By limiting the distance between the positive electrode 5 of the DBD plasma actuator and the shock wave to 0 to 10 mm, it is beneficial to make the plasma formed by the DBD plasma actuator be located in the shock wave region as much as possible, thereby facilitating the interaction between the plasma and the shock wave. In a more specific example, the distance between the positive electrode 5 of the DBD plasma actuator and the shock wave generated by the moving blade 2 in the axial direction is 5 mm, referring to Figure 1 The rightmost end of the positive electrode 5 of the DBD plasma actuator is in the axial direction (with Figure 1 It should be noted that the distance here refers to the distance in the upstream area of ​​the shock wave.

[0035] The moving blade 2 of the present disclosure is mainly used to do work on the airflow through high-speed rotation, thereby converting mechanical energy into gas pressure energy. The present disclosure uses the moving blade 2 to form the negative pole of the DBD plasma actuator, and the tip of the moving blade 2 is provided with a second insulating medium 6. For example, the upper end surface and both side surfaces at a certain height of the moving blade 2 are covered with the second insulating medium 6, so that the positive pole 5 and the negative pole of the DBD plasma actuator are isolated by the second insulating medium 6. Figure 2 A perspective view of a rotor blade 2 in a gas power device is shown. Figure 2 LE on the left side represents the leading edge of the moving blade 2. Figure 2 TE on the right side of represents the trailing edge of the moving blade 2, and shock represents the shock wave formed by the moving blade 2 (i.e. Figure 1 The cascade channel shock wave B in the Figure 2 The surface where the black block in the figure is located is the upper end surface of the moving blade 2. In addition, the material of the second insulating medium 6 can also be determined according to the actual conditions such as the temperature, pressure and voltage level in the gas power equipment. For example, the material of the second insulating medium 6 can be plastic or rubber or a composite material, etc. The present disclosure does not specifically limit the material of the second insulating medium 6.

[0036] In one example, the height of the second insulating medium 6 disposed on the tip of the moving blade 2 may range from 1 mm to 5 mm. By using the moving blade 2 to form the negative electrode of the DBD plasma actuator and limiting the height of the second insulating medium 6 disposed on the tip of the blade, it is beneficial to concentrate the plasma formed by the DBD plasma actuator in the tip area (e.g. Figure 1 In a more specific example, the plasma region A is located at the tip gap. Figure 1 The height of the second insulating medium 6 arranged on the tip of the moving blade 2 is 1 mm.

[0037] In one example, the thickness of the second insulating medium 6 provided on the tip of the moving blade 2 may be different. For example, the thickness of the second insulating medium 6 provided in the upstream interval of the tip of the moving blade 2 is often greater than the thickness of the second insulating medium 6 provided in the downstream interval. That is, if there are two points in the second insulating medium 6 provided on the tip of the moving blade 2, namely, the first point and the second point, if the first point belongs to the upstream interval of the tip of the moving blade 2, and the second point belongs to the downstream interval of the tip of the moving blade 2, the thickness of the second insulating medium 6 at the location of the first point is greater than the thickness of the second insulating medium 6 at the location of the second point; if the first point and the second point both belong to the upstream interval of the tip of the moving blade 2, the thickness of the second insulating medium 6 at the location of the first point may be the same as the thickness of the second insulating medium 6 at the location of the second point; and if the first point and the second point both belong to the downstream interval of the tip of the moving blade 2, the thickness of the second insulating medium 6 at the location of the first point may be the same as the thickness of the second insulating medium 6 at the location of the second point. The upstream here is also the upstream based on the incoming flow direction of the gas power device. A more specific example, Figure 1 In the example, the incoming flow direction is horizontal from left to right. If the first point is located on the left side of the second point, it can be considered that the first point is located upstream of the second point, and the second point is located downstream of the first point. By making the thickness of the second insulating medium 6 in the downstream section smaller than the thickness of the second insulating medium 6 in the upstream section, it is beneficial to make the plasma formed by the DBD plasma actuator concentrated in the downstream section (such as Figure 1 The plasma region A in the moving blade is located closer to the trailing edge TE of the moving blade 2. The shock wave generated by the rotation of the moving blade 2 is usually located in the downstream area of ​​the tip of the moving blade 2 (such as Figure 1 The mid-blade cascade channel shock wave B is located slightly to the right of the blade tip of the moving blade 2), which is beneficial to enhancing the interaction between plasma and the shock wave.

[0038] In one example, the second insulating medium 6 at the tip of the moving blade 2 may include a dividing point, which is used to divide the second insulating medium 6 provided on the tip of the moving blade 2 into two parts in the incoming flow direction (such as Figure 1 The left and right parts of the upstream insulating medium (such as Figure 1 The left part of the image) and the downstream insulating medium (such as Figure 1The right part in the figure). The upstream insulating medium has a first thickness (i.e., the thickness at each point in the upstream insulating medium is the same, which is the first thickness), and the downstream insulating medium has a second thickness (i.e., the thickness at each point in the downstream insulating medium is the same, which is the second thickness), and the first thickness is greater than the second thickness. In an application scenario, the position of the demarcation point can be: in the axial direction of the anode 5 of the DBD plasma actuator, the distance from the anode 5 can be within a distance range, and the distance range is generally in the micron (μm) level, for example, 0 to 10μm. In addition, the demarcation point should be located downstream of the anode 5. More specifically, in the axial direction of the anode 5 of the DBD plasma actuator, the demarcation point is downstream of the anode 5 and is 1μm away from the anode 5. Refer to Figure 1 The distance between the rightmost end of the anode 5 of the DBD plasma actuator and the demarcation point is 1 μm. Figure 1 When the distance between the positive electrode 5 and the demarcation point is a predetermined value (such as 5 mm), and the distance between the rightmost end of the positive electrode 5 of the DBD plasma actuator and the demarcation point is another predetermined value (such as 1 μm), it is beneficial to ensure that the plasma formed by the DBD plasma actuator can act in the shock wave region as much as possible, thereby maximizing the interaction between the plasma and the shock wave.

[0039] In one example, when the second insulating medium 6 is divided into an upstream insulating medium and a downstream insulating medium at a dividing point, the thickness of the upstream insulating medium may be in a range of one-third to one-half of the tip clearance of the moving blade 2, and the thickness of the downstream insulating medium may also be in a range of one-third to one-half of the tip clearance of the moving blade 2. However, it should be noted that the thickness of the upstream insulating medium should be greater than that of the downstream insulating medium. By keeping the thickness of the upstream insulating medium and the thickness of the downstream insulating medium both in a range of one-third to one-half of the tip clearance, it is helpful to further ensure that the plasma formed by the DBD plasma actuator acts completely in the shock wave region.

[0040] The AC power supply 4 in the present disclosure is respectively connected to the positive electrode 5 and the negative electrode (moving blade 2) of the DBD plasma actuator, so as to provide power for the DBD plasma actuator, thereby causing the DBD plasma actuator to generate plasma of a certain intensity. Since the plasma interacts with the shock wave in the blade tip area, it is beneficial to suppress the leakage flow of gas in the blade tip area of ​​the moving blade 2.

[0041] Figure 3 FIG. 1 is a flow chart of an embodiment of a method for controlling the flow field in the blade tip region of a gas power device disclosed in the present invention. Figure 3The method shown mainly includes: S300, S301, S302 and S303. Figure 3 Each step in is described separately.

[0042] S300: Determine the position of the shock wave generated by the moving blades 2 of the rotor of the gas power device in the axial direction of the rotor.

[0043] The present disclosure may use experiments or numerical simulations to determine the position of the shock wave generated by the moving blades 2 of the rotor of the gas power device in the axial direction of the rotor. For example, a model of a gas power device may be used to conduct experiments to obtain the position of the shock wave generated by the moving blades 2 of the rotor of the gas power device in the axial direction of the rotor. For another example, numerical simulations may be performed using various parameters of the gas power device to obtain the position of the shock wave generated by the moving blades 2 of the rotor of the gas power device in the axial direction of the rotor. The present disclosure does not limit the specific implementation method of determining the position of the shock wave generated by the moving blades 2 of the rotor of the gas power device in the axial direction of the rotor. In addition, the gas power device in this step may be a transonic fan or compressor based on axial flow, etc.

[0044] S301. At the upstream of the above position, along the circumferential direction of the rotor blades 2, the positive electrode 5 of the DBD plasma actuator is arranged in the first insulating medium 3 to form an annular positive electrode.

[0045] The first insulating medium 3 in the present disclosure is arranged on the inner wall of the casing 1 of the gas power device along the rotation circumferential direction of the moving blade 2, thereby forming an annular insulating medium, which is opposite to the blade tip of the moving blade 2, and the first insulating medium 3 is mainly used to isolate the annular positive electrode from the inner wall of the casing 1. The upstream here is the upstream based on the incoming flow direction of the gas power device.

[0046] In one example, the present disclosure can arrange the annular positive electrode in the axial direction of the positive electrode 5 of the DBD plasma actuator (i.e., the axial direction of the rotor) within a range of 0 to 10 mm (millimeter) from the position obtained in the above S300. In a more specific example, the present disclosure can arrange the positive electrode in the axial direction of the positive electrode 5 of the DBD plasma actuator at a position 5 mm away from the position obtained in the above S300, thereby forming an annular positive electrode, i.e. Figure 1 The rightmost end of the positive electrode 5 of the DBD plasma actuator is in the axial direction (with Figure 1 The distance between the two surfaces (in the same direction as the horizontal flow) is 5mm.

[0047] S302, a second insulating medium 6 is provided on the tip of the moving blade 2, and the positive electrode 5 and the negative electrode of the DBD plasma actuator are isolated by the second insulating medium 6, and the moving blade 2 is used as the negative electrode of the DBD plasma actuator.

[0048] In one example, the second insulating medium 6 provided on the tip of the moving blade 2 of the present disclosure may have a height ranging from 1 mm to 5 mm. For example, the second insulating medium 6 having a height of 1 mm is provided on the tip of the moving blade 2 .

[0049] In one example, when the present disclosure sets the second insulating medium 6 on the tip of the moving blade 2, the thickness of the second insulating medium 6 on the tip can be different. For example, the thickness of the second insulating medium 6 set for the upstream section of the tip of the moving blade 2 can be greater than the thickness of the second insulating medium 6 set for the downstream section. In a more specific example, the present disclosure can first determine a dividing point on the tip of the moving blade 2, and when the second insulating medium 6 is set upstream and downstream of the dividing point, respectively, the thickness of the upstream insulating medium is greater than the thickness of the downstream insulating medium.

[0050] In an application scenario, the present disclosure can first define a distance range downstream of the reference point, with the positive electrode 5 as a reference point in the axial direction of the positive electrode 5 of the DBD plasma actuator (the distance from the reference point can be in the micron level, such as 0 to 10 μm), and use one point in the distance range as a dividing point. For example, a point in the distance range that is 1 μm away from the positive electrode 5 in its axial direction is used as the dividing point.

[0051] In one example, after determining the dividing point, the present disclosure can determine the thickness of the upstream insulating medium and the thickness of the downstream insulating medium based on the interval range of one-third to one-half of the tip clearance of the moving blade 2. However, it should be noted that the thickness of the upstream insulating medium in the present disclosure is always greater than the thickness of the downstream insulating medium.

[0052] S303. Verify the rotor operating characteristic parameters of the gas power equipment through experiments or numerical simulations.

[0053] In one example, the rotor operating characteristic parameters in the present disclosure may include: operating pressure ratio (such as total pressure ratio) and operating efficiency, etc. The operating pressure ratio (such as total pressure ratio) is a core parameter for measuring the boosting capability of the gas power device, and may specifically be the ratio of the total gas pressure at the outlet cross section of the gas power device to the total gas pressure at the inlet cross section. The operating efficiency is a core parameter for measuring the effectiveness of energy conversion, and may specifically be the ratio of the energy consumed in the actual compression process to the energy required for the ideal reversible (such as isentropic) compression process.

[0054] When verifying the rotor operating characteristic parameters of the gas power device by experimental means, the present disclosure may not use the AC power supply 4 to power the DBD plasma actuator, such as not connecting the AC power supply 4 to the positive electrode 5 and the negative electrode of the DBD plasma actuator, and then operate the gas power device (such as Rotor37) under full operating conditions, and obtain the rotor operating characteristic parameters of the gas power device through measurement and other means, which are recorded as the first set of rotor operating characteristic parameters. Afterwards, the working voltage (U) and working frequency (f) of the AC power supply 4 are set, wherein the working voltage can be a working power supply in the range of 5-20 kV, and the working frequency can be a working frequency in the range of 3-20 kHz. The present disclosure can set the working voltage and working frequency according to empirical values. For example, the working voltage can be set to 10 kV, and the working frequency can be set to 5 kHz. The AC power supply 4 is connected to the positive electrode 5 and the negative electrode of the DBD plasma actuator. The AC power supply 4 uses the set working voltage and working frequency to power the DBD plasma actuator, and enables the gas power device to operate under full operating conditions. The plasma generated by the DBD plasma actuator can induce an electric field force locally in the blade tip area, and axially accelerate the flow field in the blade tip area. The present disclosure can obtain the rotor working characteristic parameters of the gas power device under full operating conditions through measurement and other methods, which are recorded as the second group of rotor working characteristic parameters.

[0055] When verifying the rotor operating characteristic parameters of the gas power equipment by numerical simulation, the present disclosure can use the following formula (1) to determine the plasma excitation effect of the DBD plasma actuator: F = 1.07 × 10 -6 Uf / d Formula (1) In the above formula (1), F represents the body force and its unit is N / m 3 (i.e., Newton / cubic meter), that is, the present disclosure uses the volume force F corresponding to the plasma generated by the plasma exciter as the excitation effect of the plasma; U represents the working voltage of the AC power source 4 (e.g., U can be 10 kV), f represents the working frequency of the AC power source 4 (e.g., f can be 5 kHz), and d represents the distance between the demarcation point and the positive electrode 5 in the incoming flow direction (e.g., 1 μm). An example of the position and direction of F calculated using formula (1) is as follows: Figure 2 As shown, Figure 2 The direction of the arrow in indicates the direction of the body force F, and Figure 2 The position of the leftmost arrow of F corresponds to Figure 1 The leftmost part of plasma region A, Figure 2 The position of the rightmost arrow of F corresponds to Figure 1The rightmost end of the plasma region A in .

[0056] The present disclosure can integrate the volume force calculated by the above formula (1) to obtain the total volume force in the plasma region A, and the total volume force is equivalent to the plasma excitation effect. By adding the total volume force to the fluid control equation, the flow field of the gas power device after excitation control is simulated, and the rotor working characteristic parameters of the gas power device are obtained according to the simulation results, which are recorded as the third group of rotor working characteristic parameters. In addition, the present disclosure can also simulate the process of the gas power device without excitation control, and obtain the rotor working characteristic parameters of the gas power device according to the simulation results.

[0057] The first set of rotor operating characteristic parameters, the second set of rotor operating characteristic parameters and the third set of rotor operating characteristic parameters can be as follows: Figure 4 and Figure 5 As shown. Figure 4 This is a comparison chart of the total pressure ratio obtained by experimental and numerical simulation for Rotor37 (a compressor). Figure 4 The horizontal axis m (kg / s) represents the working flow rate of the rotor, and the vertical axis π represents the total inlet and outlet pressure ratio of the rotor. Figure 4 The solid line in represents the numerical simulation result with excitation control, that is, the total pressure ratio of all working conditions obtained by adopting the technical solution disclosed in the present invention, Figure 4 The dashed line in the figure represents the numerical simulation result without excitation control. Figure 4 The dots in the figure represent the total pressure ratio with excitation control obtained experimentally. Figure 4 It can be seen that compared with the numerical simulation results without excitation control, the total pressure ratio of Rotor37 can be increased by 0.5% after excitation control. Figure 5 This is a comparison chart of the working efficiency obtained by experiments and numerical simulations for Rotor37. Figure 5 The horizontal axis m (kg / s) represents the working flow rate of the rotor, and the vertical axis η It represents the working efficiency of the rotor. Figure 5 The solid line in represents the numerical simulation results with excitation control. Figure 5 The dashed line in the figure represents the numerical simulation result without excitation control. Figure 5 The dots in the figure represent the working efficiency with excitation control obtained by experimental method. Figure 5 It can be seen that compared with the experiment without excitation control, the experiment with excitation control and the numerical simulation results of the to-be-excited control, the working efficiency of Rotor37 can be improved by 0.8%. It can be seen that the present disclosure achieves the simultaneous improvement of multiple performances in all working conditions at a given design speed by performing excitation control in Rotor37.

[0058] In one example, the present disclosure can further improve the working performance of the gas powered device under all working conditions by adjusting the working voltage and / or working frequency of the DBD plasma actuator. The specific process is as follows: First, the operating voltage and operating frequency of the DBD plasma actuator are set. For example, the operating voltage and operating frequency of the DBD plasma actuator are set using empirical values, and based on the currently set operating voltage and operating frequency, the AC power supply 4 provides power to the DBD plasma actuator, and a set of operating characteristic parameters of the rotor of the gas power equipment are obtained by experimental or numerical simulation methods.

[0059] Secondly, according to the predetermined step size, the operating voltage or the operating frequency of the DBD plasma actuator is adjusted, and based on the adjusted operating voltage and operating frequency, the AC power supply 4 provides power for the DBD plasma actuator, and a set of operating characteristic parameters of the rotor of the gas power equipment is obtained by experimental or numerical simulation.

[0060] The present disclosure has multiple ways to adjust the working voltage and working frequency of the DBD plasma actuator using a predetermined step length. However, under normal circumstances, only one of them can be adjusted at a time. The present disclosure can alternately adjust the working voltage and working frequency of the DBD plasma actuator, for example, the working voltage is adjusted while maintaining the current working frequency for the first time, the working frequency is adjusted while maintaining the current working voltage for the second time, and the working voltage is adjusted while maintaining the current working frequency for the third time. For another example, the working voltage is adjusted while maintaining the current working frequency for the first time, and the working voltage is still adjusted while maintaining the current working frequency for the second time, ..., until the working voltage is no longer adjusted, and then the working frequency is adjusted each time while maintaining the working voltage. When adjusting the working voltage, the present disclosure can gradually increase the working voltage of the DBD plasma actuator according to a predetermined step length. When adjusting the working frequency, the present disclosure can gradually increase the working frequency of the DBD plasma actuator according to a predetermined step length.

[0061] Finally, the present disclosure can compare all the sets of working characteristic parameters currently obtained, and determine the working voltage and working frequency of the DBD plasma actuator during the operation of the gas power device in combination with actual needs and comparison results. For example, the working voltage and working frequency corresponding to the set with the best working characteristic parameters can be used as the working voltage and working frequency of the DBD plasma actuator.

[0062] Reference below Figure 6 An electronic device according to an embodiment of the present disclosure is described. Figure 6 1 shows a block diagram of an electronic device according to an embodiment of the present disclosure. Figure 6As shown, the electronic device 61 includes one or more processors 611 and a memory 612 .

[0063] The processor 611 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 61 to perform desired functions.

[0064] The memory 612 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory, for example, may include: random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory, for example, may include: read-only memory (ROM), hard disk, and flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 611 may execute the program instructions to implement the method of controlling the flow field in the tip area of ​​the gas power equipment of the various embodiments of the present disclosure described above and / or other desired functions.

[0065] In one example, the electronic device 61 may further include: an input device 613 and an output device 614, etc., which are interconnected through a bus system and / or other forms of connection mechanisms (not shown). In addition, the input device 613 may also include, for example, a keyboard, a mouse, etc. The output device 614 may output various information to the outside. The output device 614 may include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, etc.

[0066] Of course, to simplify, Figure 6 Only some of the components related to the present disclosure in the electronic device 61 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application situations, the electronic device 61 may also include any other appropriate components.

[0067] Exemplary computer program products and computer-readable storage media In addition to the above-mentioned methods and devices, an embodiment of the present disclosure may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method for controlling the flow field in the tip area of ​​a gas power device according to various embodiments of the present disclosure described in the above-mentioned "Exemplary Method" section of this specification.

[0068] The computer program product may be written in any combination of one or more programming languages ​​to write program code for performing the operations of the disclosed embodiments, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0069] In addition, an embodiment of the present disclosure may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, enables the processor to execute the steps of the method for controlling the flow field in the tip area of ​​a gas power device according to various embodiments of the present disclosure described in the above “Exemplary Method” section of this specification.

[0070] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive enumeration) of readable storage media can include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0071] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, rather than limitation, and the above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0072] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0073] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present disclosure are intended only as illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems may be connected, arranged, and configured in any manner. Words such as "include," "comprise," "have," and the like are open words, meaning "including but not limited to," and may be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or," and may be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and may be used interchangeably therewith.

[0074] The method and apparatus of the present disclosure may be implemented in many ways. For example, the method and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present disclosure may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present disclosure. Therefore, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

[0075] It should also be noted that in the apparatus, device and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0076] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects, etc., will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0077] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A gas powered device, characterized in that: The gas power device is a transonic fan or compressor based on axial flow, and comprises: a casing (1), a dielectric barrier discharge (DBD) plasma actuator, a plurality of moving blades (2), a first insulating medium (3), an AC power supply (4), and a second insulating medium (6), and the DBD plasma actuator, the plurality of moving blades (2), the first insulating medium (3), the AC power supply (4), and the second insulating medium (6) are all arranged in the casing (1); A first insulating medium (3) is arranged on the inner wall of the casing (1), and the first insulating medium (3) is arranged along the rotational circumference of the moving blade (2) to form an annular insulating medium, and the annular insulating medium is opposite to the blade tip of the moving blade (2); The positive electrode (5) of the DBD plasma actuator is arranged along the rotational circumference of the moving blade (2) to form an annular positive electrode, and the annular positive electrode is arranged in the first insulating medium (3), and the annular positive electrode and the inner wall of the casing (1) are isolated by the first insulating medium (3). The annular positive electrode is located upstream of the shock wave formed by the moving blade (2), and the upstream is upstream based on the incoming flow direction of the gas power device; The moving blade (2) is used as the negative electrode of the DBD plasma actuator, and a second insulating medium (6) is provided at the tip of the moving blade (2), and the positive electrode (5) and the negative electrode of the DBD plasma actuator are isolated by the second insulating medium (6); The AC power supply (4) is connected to the positive electrode (5) and the negative electrode of the DBD plasma actuator respectively, and is used to provide power to the DBD plasma actuator, so that the DBD plasma actuator generates plasma, and the plasma interacts with the shock wave formed by the rotation of the moving blade (2).

2. The device according to claim 1, characterized in that: The first insulating medium (3) is embedded in the inner wall of the casing (1), and the outer surface of the first insulating medium (3) is not higher than the inner wall of the casing (1); The annular positive electrode is embedded in the first insulating medium (3), and the outer surface of the annular positive electrode is not higher than the outer surface of the first insulating medium (3).

3. The device according to claim 1, characterized in that The distance between the annular positive electrode and the shock wave in the axial direction is 0 to 10 mm.

4. The device according to claim 1, characterized in that The height of the second insulating medium (6) provided on the tip of the moving blade (2) is within a range of 1 to 5 millimeters.

5. The device according to any one of claims 1 to 4, characterized in that For any two points of the second insulating medium (6) provided on the blade tip of the moving blade (2), the thickness of the second insulating medium (6) at the upstream point is not less than the thickness of the second insulating medium (6) at the downstream point; Wherein, the upstream includes: the upstream based on the incoming flow direction of the gas power equipment.

6. The device according to claim 5, characterized in that The second insulating medium (6) provided on the tip of the moving blade (2) comprises: a dividing point, wherein the dividing point divides the second insulating medium (6) provided on the tip of the moving blade (2) into an upstream insulating medium and a downstream insulating medium, wherein the thickness of the upstream insulating medium is the same, the thickness of the downstream insulating medium is the same, and the thickness of the upstream insulating medium is greater than the thickness of the downstream insulating medium.

7. The device according to claim 6, characterized in that The distance between the demarcation point and the annular positive electrode in the axial direction of the annular positive electrode includes: 0 to 10 microns, and the demarcation point is located downstream of the annular positive electrode; Wherein, the downstream includes: the downstream based on the incoming flow direction of the gas power equipment.

8. The device according to claim 6, characterized in that The thickness of the upstream insulating medium and the downstream insulating medium comprises: one third to one half of the tip clearance of the moving blade (2).

9. A method for controlling the flow field in the blade tip area of ​​a gas power device, characterized in that: The method comprises: Determining the position of a shock wave generated by a moving blade (2) of a rotor of a gas power device in the axial direction of the rotor; wherein the gas power device is a transonic fan or compressor based on axial flow; Upstream of the position, along the rotational circumference of the moving blade (2), a positive electrode (5) of a DBD plasma actuator is arranged in a first insulating medium (3) to form an annular positive electrode; wherein the first insulating medium (3) is arranged on the inner wall of a casing (1) of the gas power device along the rotational circumference of the moving blade (2) to form an annular insulating medium, the annular insulating medium is opposite to the blade tip of the moving blade (2), the first insulating medium (3) isolates the annular positive electrode from the inner wall of the casing (1), and the upstream is an upstream based on the incoming flow direction of the gas power device; A second insulating medium (6) is arranged on the tip of the moving blade (2), and the second insulating medium (6) isolates the positive electrode (5) and the negative electrode of the DBD plasma actuator; wherein the moving blade (2) is used as the negative electrode of the DBD plasma actuator; The rotor operating characteristic parameters of the gas power equipment are verified by experiments or numerical simulations.

10. The method according to claim 9, characterized in that The verifying of the rotor operating characteristic parameters of the gas power equipment by means of experiments or numerical simulations includes: Setting the operating voltage and the operating frequency of the DBD plasma actuator so that the AC power source (4) provides power to the DBD plasma actuator based on the operating voltage and the operating frequency, and obtaining a set of operating characteristic parameters of the rotor of the gas power device by means of experiments or numerical simulations; adjusting the operating voltage or the operating frequency of the DBD plasma actuator according to a predetermined step length, so that the AC power supply (4) provides power to the DBD plasma actuator based on the adjusted operating voltage and operating frequency, and obtaining a set of operating characteristic parameters of the rotor of the gas power device by means of experiments or numerical simulations; Based on the comparison of multiple groups of operating characteristic parameters, the operating voltage and operating frequency of the DBD plasma actuator are determined.

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