A compressor casing and its flow control method

Abstract

The present invention provides a compressor casing and a flow control method thereof. The compressor casing includes: an annular casing outer shell provided with a plurality of through holes penetrating the inner wall surface and the outer wall surface of the casing outer shell, and the inner wall surface is recessed outward to form a groove; an annular flexible inner wall plate fixed to the inner wall surface of the casing outer shell, the flexible inner wall plate is made of a shape memory material, and the groove is located outside the flexible inner wall plate; a deformation excitation is applied to the flexible inner wall plate through the through holes, so that at least part of the flexible inner wall plate deforms in a direction perpendicular to the radial direction of the flexible inner wall plate, so as to change the radial distance between the deformed part of the flexible inner wall plate and the tip of the rotor blade of the compressor. Therefore, this solution can change the radial distance between the tip of the rotor blade and the flexible inner wall plate of the casing according to the working environment of the compressor, so as to adjust the stability margin and aerodynamic efficiency of the compressor according to the working environment of the compressor.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of aero-engines, and in particular to a compressor casing and a flow control method thereof. Background Art

[0002] The control of compressor instability is an unavoidable topic in the process of developing high-performance aircraft engines. Due to the extremely complex working environment of aircraft engines, they will inevitably operate under non-design conditions. In order to improve the stability margin of the compressor, a common method is to process the compressor casing. Simply put, it is to groove the casing wall above the rotor, and change the flow characteristics of the tip area by changing the radial distance between the rotor blade tip and the casing wall, thereby improving the performance under non-design conditions and effectively suppressing the instability of the compressor. However, such a casing processing method will reduce the aerodynamic efficiency of the compressor operating under design conditions.

[0003] Therefore, there is an urgent need for a new compressor casing and a flow control method thereof. Summary of the invention

[0004] Based on the problem that the existing casing processing method may lead to a decrease in the aerodynamic efficiency of the compressor under design conditions, an embodiment of the present invention provides a compressor casing and a flow control method thereof.

[0005] In a first aspect, an embodiment of the present invention provides a casing of a compressor, comprising:

[0006] The casing shell is annular and is provided with a plurality of through holes penetrating the inner wall surface and the outer wall surface of the casing shell, and the inner wall surface is outwardly concave to form a groove;

[0007] An annular flexible inner wall plate is fixed to the inner wall surface of the casing shell, the flexible inner wall plate is made of shape memory material, and the groove is located on the outer side of the flexible inner wall plate;

[0008] Deformation excitation is applied to the flexible inner wall plate through the through hole, so that at least part of the flexible inner wall plate undergoes radial deformation perpendicular to the flexible inner wall plate, so as to change the radial distance between the deformed part of the flexible inner wall plate and the tip of the compressor rotor blade.

[0009] Preferably, the casing shell further comprises:

[0010] A limiting portion, located at the inner side of the groove, the limiting portion is used to limit the axial position of the flexible inner wall plate;

[0011] A plurality of pin holes are arranged above and below the groove, and the pin holes are used to fix the flexible inner wall plate in the limiting portion.

[0012] Preferably, the plasma in the plasma layer is distributed in a gradient; among them, the plasma density closer to the plasma generator is greater than the plasma density farther from the plasma generator.

[0013] Preferably, the deformation excitation includes temperature excitation and air pressure difference excitation.

[0014] Preferably, it further includes:

[0015] A temperature sensor is arranged on the flexible inner wall panel, and the temperature sensor is used to monitor the temperature of the flexible inner wall panel when a temperature excitation is applied to the flexible inner wall panel.

[0016] A pressure sensor is arranged in the through hole, and the pressure sensor is used to monitor the air pressure in the through hole when an air pressure difference excitation is applied to the flexible inner wall panel.

[0017] In a second aspect, an embodiment of the present invention further provides a flow control method based on the casing according to any embodiment of this specification, including:

[0018] When receiving an instruction to change the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor, hot air is filled into each through hole until the temperature of the flexible inner wall panel rises to the target phase change temperature of the flexible inner wall panel;

[0019] An air pressure difference is formed between the inside of each through hole and the outside of the casing housing, so that at least part of the flexible inner wall panel deforms perpendicular to the radial direction of the flexible inner wall panel, so as to change the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor.

[0020] Preferably, when the instruction is to increase the radial distance, the forming an air pressure difference between the inside of each through hole and the outside of the casing housing, so that at least part of the flexible inner wall panel deforms perpendicular to the radial direction of the flexible inner wall panel, so as to change the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor includes:

[0021] Negative pressure is filled into each through hole for a first set time period, so that at least part of the flexible inner wall panel deforms perpendicular to the radial direction of the flexible inner wall panel to increase the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor; among them, the increased radial distance is the target increased value carried in the instruction.

[0022] Preferably, when the instruction is to decrease the radial distance, forming a pressure difference between the inside of each through hole and the outside of the casing to cause at least a part of the flexible inner wall panel to deform perpendicular to the radial direction of the flexible inner wall panel, so as to change the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor, includes:

[0023] Filling each through hole with positive-pressure cold air for a second set duration, so that at least a part of the flexible inner wall panel deforms perpendicular to the radial direction of the flexible inner wall panel, to decrease the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor; wherein, the decreased radial distance is the target decrease value carried in the instruction.

[0024] Preferably, the first set duration is determined in the following manner:

[0025] Formulating a corresponding database of the increasing speed relationship of the radial distance according to different phase change temperature values and negative pressures of different pressure values;

[0026] Determining the current increasing speed of the radial distance according to the target phase change temperature, the pressure value of the currently filled negative pressure, and the increasing speed relationship database;

[0027] Determining the first set duration according to the target increase value of the radial distance and the current increasing speed of the radial distance.

[0028] Preferably, after increasing the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor, it further includes:

[0029] Filling each through hole with cold air to quickly cool the flexible inner wall panel below the minimum phase change temperature value.

[0030] Preferably, the target phase change temperature is the minimum phase change temperature value of the flexible inner wall panel;

[0031] The second set duration is determined in the following manner:

[0032] Formulating a corresponding database of the decreasing speed relationship of the radial distance according to the target phase change temperature, positive-pressure cold air of different pressure values, and positive-pressure cold air of different temperatures;

[0033] Determining the current decreasing speed of the radial distance according to the pressure value, temperature of the currently filled positive-pressure cold air, and the decreasing speed relationship database;

[0034] Determining the second set duration according to the target decrease value of the radial distance and the current decreasing speed of the radial distance.

[0035] An embodiment of the present invention provides a casing of a compressor and a flow control method thereof. By arranging a plurality of through holes penetrating the inner wall surface and the outer wall surface of the annular casing housing, and forming a groove by recessing the inner wall surface of the casing housing outward, and then fixing an annular flexible inner wall plate to the inner wall surface of the casing housing, wherein the flexible inner wall plate is made of a shape memory material and is located inside the groove; finally, a deformation excitation is applied to the flexible inner wall plate through the through holes, so that at least a part of the flexible inner wall plate deforms in a direction perpendicular to the radial direction of the flexible inner wall plate, so as to change the radial distance between the deformed part of the flexible inner wall plate and the tip of the rotor blade of the compressor. Therefore, according to the working environment of the compressor, the radial distance between the tip of the rotor blade and the flexible inner wall plate of the casing can be changed, so that the stability margin and aerodynamic efficiency of the compressor can be adjusted according to the working environment of the compressor. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 is a schematic structural diagram of a casing of a compressor provided by an embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of the memory initial state of a flexible inner wall plate provided by an embodiment of the present invention;

[0039] Figure 3 is a flowchart of a flow control method provided by an embodiment of the present invention;

[0040] Reference numerals: 1 - casing housing; 2 - flexible inner wall plate; 3 - groove; 4 - through hole; 5 - limiting part; 6 - pin hole. Detailed Embodiments

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0042] As described above, due to the extremely complex working environment of aeroengines, they inevitably operate under off-design conditions. To improve the stability margin of the compressor, a common method is to process the compressor casing. Simply put, it is to slot the casing wall above the rotor. By increasing the radial distance between the tip of the rotor blade and the casing wall, the flow characteristics in the tip region are changed, thereby improving the performance under off-design conditions and effectively suppressing the instability of the compressor. However, increasing the radial distance between the tip of the rotor blade and the casing wall will cause a decrease in the aerodynamic efficiency of the compressor when it operates under design conditions.

[0043] In summary, the inventors considered that the radial distance between the tip of the rotor blade and the casing wall could be adaptively changed according to the working environment of the compressor. Shape Memory Polymer (SMP) materials are given a certain initial memory state under certain conditions. When the external conditions change, they can change their shape accordingly and fix it (deformed state). If the external environment changes again in a specific way and pattern, they can reversibly return to the initial state, thus completing the cycle of "initial memory state - fixed deformed state - restored initial state". Therefore, in this solution, a flexible inner wall plate of the compressor is made of shape memory material. By applying a deformation excitation to the flexible inner wall plate, the flexible inner wall plate undergoes a radial deformation perpendicular to itself, so as to change the radial distance between the deformed part of the flexible inner wall plate and the tip of the rotor blade of the compressor, achieving the purpose of changing the radial distance between the tip of the rotor blade and the casing wall according to the working environment of the compressor. Thus, under off-design conditions, the stability margin of the compressor can be improved, and under design conditions, the aerodynamic efficiency of the compressor can be increased, so as to increase the fuel consumption rate during the engine cycle state and shorten the aircraft range.

[0044] The following describes the specific implementation of the above concept.

[0045] Please refer to Figure 1 , in which, Figure 1 is a schematic structural diagram of the compressor casing. The device includes:

[0046] A ring-shaped casing outer shell 1 is provided with a number of through holes 4 penetrating the inner wall surface and the outer wall surface of the casing outer shell 1, and the inner wall surface is recessed outward to form a groove 3;

[0047] A ring-shaped flexible inner wall plate 2 is fixed to the inner wall surface of the casing outer shell 1. The flexible inner wall plate 2 is made of shape memory material, and the groove 3 is located outside the flexible inner wall plate 2;

[0048] A deformation excitation is applied to the flexible inner wall panel 2 through the through holes 4, so that at least part of the flexible inner wall panel 2 deforms perpendicular to the radial direction of the flexible inner wall panel 2, to change the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor.

[0049] In the embodiment of the present invention, by providing a plurality of through holes 4 penetrating the inner wall surface and the outer wall surface of the annular casing 1, and forming a groove 3 by recessing the inner wall surface of the casing 1 outward, and then fixing the annular flexible inner wall panel 2 to the inner wall surface of the casing 1, wherein the flexible inner wall panel 2 is made of a shape memory material, and the flexible inner wall panel 2 is located inside the groove 3; finally, a deformation excitation is applied to the flexible inner wall panel 2 through the through holes 4, so that at least part of the flexible inner wall panel 2 deforms perpendicular to the radial direction of the flexible inner wall panel 2, to change the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor. Therefore, this solution can change the radial distance between the tip of the rotor blade and the flexible inner wall panel 2 of the casing according to the working environment of the compressor, so as to adjust the stable margin and aerodynamic efficiency of the compressor to an appropriate value according to the working environment of the compressor.

[0050] In some embodiments, the casing 1 further includes:

[0051] A limiting portion 5, located inside the groove 3, and the limiting portion 5 is used to limit the axial position of the flexible inner wall panel 2;

[0052] A plurality of pin holes 6, provided above and below the groove 3, and the pin holes 6 are used to fix the flexible inner wall panel 2 in the limiting portion 5.

[0053] In this embodiment, the limiting portion 5 is used to limit the axial position of the flexible inner wall panel 2. In order to make the groove 3 located outside the flexible inner wall panel 2, the limiting portion 5 needs to be located inside the groove 3, and a plurality of uniformly distributed pin holes 6 are provided above and below the groove 3 to fix the flexible inner wall panel 2 in the limiting portion 5 with pins.

[0054] In some embodiments, the deformation excitation includes a temperature excitation and a pressure difference excitation.

[0055] In some embodiments, it further includes:

[0056] A temperature sensor, provided on the flexible inner wall panel 2, and the temperature sensor is used to monitor the temperature of the flexible inner wall panel 2 when a temperature excitation is applied to the flexible inner wall panel 2.

[0057] A pressure sensor, provided in the through hole 4, and the pressure sensor is used to monitor the air pressure in the through hole 4 when a pressure difference excitation is applied to the flexible inner wall panel 2.

[0058] In the present invention embodiment, the memory initial state of the flexible inner wall panel 2 is a circular ring piece as shown in Figure 2 , and at this time, the stiffness is relatively high. The rotor is located on the central axis of the casing of the compressor, and the top blades of the rotor are located inside the casing.

[0059] When, according to the working environment of the compressor, it is necessary to increase the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor, a temperature excitation is applied to the flexible inner wall panel 2 through the through holes 4, that is, hot air is filled into each through hole 4 to raise the temperature of the flexible inner wall panel 2 to the target phase change temperature of the flexible inner wall panel 2. Among them, the phase change temperature of the flexible inner wall panel 2 is a temperature range, within which the shape of the flexible inner wall panel 2 can be shaped. When the temperature of the flexible inner wall panel 2 is lower than the phase change temperature, the stiffness of the flexible inner wall panel 2 is relatively high and it is not easy to deform. After the temperature of the flexible inner wall panel 2 rises to the target phase change temperature of the flexible inner wall panel 2, by applying a pressure difference excitation to the through holes 4, that is, filling negative pressure into each through hole 4, the part of the flexible inner wall panel 2 corresponding to the groove 3 can be deformed in the direction close to the groove 3, so that the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor can be increased. After increasing the radial distance, the flexible inner wall panel 2 is cooled, so that the flexible inner wall panel 2 can complete the shaping.

[0060] When, according to the working environment of the compressor, it is necessary to decrease the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor, a temperature excitation is applied to the flexible inner wall panel 2 through the through holes 4, that is, hot air is filled into each through hole 4 to raise the temperature of the flexible inner wall panel 2 to the target phase change temperature of the flexible inner wall panel 2. After the temperature of the flexible inner wall panel 2 rises to the target phase change temperature of the flexible inner wall panel 2, the flexible inner wall panel 2 will gradually recover to the memory initial state, so that the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor can be decreased.

[0061] Next, the flow control method of the casing of the compressor described in any embodiment of this specification will be described.

[0062] Please refer to Figure 3 , the embodiment of the present invention provides a flow control method for the casing of a compressor based on any embodiment of this specification, and the method may include:

[0063] Step 300, when receiving an instruction to change the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor, fill hot air into each through hole 4 to raise the temperature of the flexible inner wall panel 2 to the target phase change temperature of the flexible inner wall panel 2;

[0064] Step 302: Create a pressure difference between the inside of each through hole 4 and the outside of the casing housing 1, causing at least a part of the flexible inner wall panel 2 to deform perpendicularly to the radial direction of the flexible inner wall panel 2, so as to change the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor.

[0065] In some embodiments, when the instruction is to increase the radial distance, step 302 may include:

[0066] Fill each through hole 4 with negative pressure for a first set duration, causing at least a part of the flexible inner wall panel 2 to deform perpendicularly to the radial direction of the flexible inner wall panel 2, so as to increase the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor; wherein, the increased radial distance is the target increased value carried in the instruction.

[0067] For example, when the instruction is to increase the radial distance, and the increased value, that is, the target increased value is 0.5 mm, then after step 300 makes the temperature of the flexible inner wall panel 2 reach the target phase change temperature, fill each through hole 4 with negative pressure for a first set duration, causing at least a part of the flexible inner wall panel 2 to deform perpendicularly to the radial direction of the flexible inner wall panel 2, so as to increase the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor, and the value to be increased is 0.5 mm.

[0068] Then, in order to ensure that the increased value is the target increased value, it is necessary to control the duration of filling negative pressure into each through hole 4, that is, the first set duration.

[0069] In the embodiments of the present invention, the first set duration is determined in the following manner:

[0070] Form a database of the relationship between the increased speed of the radial distance corresponding to different phase change temperature values and negative pressures of different pressure values;

[0071] According to the target phase change temperature, the pressure value of the currently filled negative pressure, and the database of the relationship between the increased speed, determine the current increased speed of the radial distance;

[0072] According to the target increased value of the radial distance and the current increased speed of the radial distance, determine the first set duration.

[0073] In this embodiment, it is necessary to pre-determine the database of the relationship between the increased speed of the radial distance through experiments. Specifically, when the flexible inner wall panel 2 is at different target phase change temperatures, fill it with negative pressures of different pressure values, and observe the increased speed of the radial distance of the flexible inner wall panel 2 under different target phase change temperatures and negative pressures of different pressure values, so as to form a corresponding database of the relationship between the increased speed of the radial distance.

[0074] It can be understood that according to the target phase change temperature in step 300 and the pressure value of the current negative pressure charged, the increasing speed of the current radial distance can be retrieved from the increasing speed relationship database; then, according to the target increased value carried in the instruction and the increasing speed of the current radial distance, the first set duration can be determined.

[0075] To prevent the flexible inner wall panel 2 from gradually deforming in the direction of restoring to the initial state of memory during cooling, after increasing the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor, it is necessary to accelerate the cooling speed of the flexible inner wall panel 2 to quickly cool the flexible inner wall panel 2 below the minimum phase change temperature value to ensure the increasing accuracy of the radial distance. Therefore, in the embodiment of the present invention, after increasing the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor, it may further include:

[0076] Inject cold air into each through hole 4 to quickly cool the flexible inner wall panel 2 below the minimum phase change temperature value.

[0077] In some embodiments, when the instruction is to decrease the radial distance, step 302 may include:

[0078] Inject positive pressure cold air for a second set duration into each through hole 4, so that at least part of the flexible inner wall panel 2 deforms perpendicular to the radial direction of the flexible inner wall panel 2 to decrease the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor; wherein, the decreased radial distance is the target decreased value carried in the instruction.

[0079] Since after the shape memory material is deformed, when the temperature reaches the phase change temperature range, the shape memory material will automatically restore to the initial state of memory. However, to improve the restoring speed of the flexible inner wall panel 2, positive pressure can be applied to the flexible inner wall panel 2 through the through holes 4. And to quickly fix the restored shape, it is necessary to inject cold air so that the flexible inner wall panel 2 is quickly cooled and fixed during the process of using positive pressure and automatically restoring to the initial state of memory.

[0080] For example, after the flexible inner wall panel 2 deforms from the circular ring shape of the initial state of memory to an increase in the radial distance from the tip of the rotor blade of the compressor by 0.5 mm, and receives a decrease radial distance instruction with a target decreased value of 0.3 mm, then it is necessary to heat the flexible inner wall panel 2 to the minimum phase change temperature value according to step 400, and inject positive pressure cold air for a second set duration into each through hole 4, so that at least part of the flexible inner wall panel 2 deforms perpendicular to the radial direction of the flexible inner wall panel 2 to decrease the radial distance between the deformed part of the flexible inner wall panel 2 and the tip of the rotor blade of the compressor, and when the decreased distance is 0.3 mm, quickly increase the stiffness to fix it at the position where the decreased distance is 0.3 mm.

[0081] Then, in order to ensure that the reduced value is the target reduced value, it is necessary to control the duration of the positive-pressure cold air filled into each through hole 4, that is, the second set duration.

[0082] In the embodiment of the present invention, the target phase change temperature is the minimum phase change temperature value of the flexible inner wall panel 2;

[0083] The second set duration is determined in the following manner:

[0084] According to the target phase change temperature, the positive-pressure cold air with different pressure values, and the positive-pressure cold air with different temperatures, a database of the reduction speed relationship of the corresponding radial distance is formulated;

[0085] According to the pressure value, temperature, and reduction speed relationship library of the currently filled positive-pressure cold air, the reduction speed of the current radial distance is determined;

[0086] According to the target reduction value of the radial distance and the reduction speed of the current radial distance, the second set duration is determined.

[0087] In this embodiment, since after the shape memory material is deformed, when the temperature reaches the phase change temperature range, the shape memory material will automatically recover its memory initial state. Due to the use of positive-pressure excitation, the flexible inner wall panel 2 rapidly reduces the radial distance. Then, when the radial distance is reduced by the target reduction value, it is necessary to rapidly cool it to fix its shape. Therefore, the target phase change temperature in step 300 can be the minimum value in the phase change temperature range of the shape memory material to ensure the reduction accuracy of the radial distance.

[0088] In this embodiment, since the reason for the reduction of the radial distance is not only due to the application of positive pressure, but also due to the characteristic that the shape memory material automatically recovers its memory initial state. Therefore, the reduction speed and the increase speed of the radial distance are not the same.

[0089] Therefore, it is necessary to pre-determine the database of the reduction speed relationship of the radial distance through experiments. Specifically, when the flexible inner wall panel 2 is at the target phase change temperature (i.e., the minimum phase change temperature value), positive-pressure cold air with different pressure values and different temperatures is filled, and the reduction speed of the radial distance of the flexible inner wall panel 2 is observed when it reaches the minimum phase change temperature value under the positive-pressure cold air with different pressure values and different temperatures, so as to formulate the corresponding database of the reduction speed relationship of the radial distance.

[0090] It can be understood that according to the pressure value and temperature of the currently filled positive-pressure cold air, the radial reduction speed of the current radial distance can be retrieved from the reduction speed relationship database; then, according to the target reduction value carried in the instruction and the reduction speed of the current radial distance, the second set duration can be determined.

[0091] It should be noted that the temperature excitation and air pressure difference excitation in this embodiment can both extract air from other devices of an aeroengine or an aircraft, such as the fan outer duct, etc. Therefore, the specific way of extracting air is not specifically limited herein. Thus, this embodiment can adaptively and automatically change the radial distance between the tip of the rotor blade and the flexible inner wall plate 2 of the casing according to the working environment of the compressor, so that while adaptively adjusting to an appropriate stability margin and aerodynamic efficiency according to the working environment of the compressor, the quality of the compressor will not be increased.

[0092] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A casing of a compressor, characterized in that, Comprising: A circular casing outer shell, provided with a plurality of through holes penetrating the inner wall surface and the outer wall surface of the casing outer shell, and the inner wall surface is recessed outward to form a groove; A circular flexible inner wall plate, fixed to the inner wall surface of the casing outer shell, the flexible inner wall plate is made of a shape memory material, and the groove is located outside the flexible inner wall plate; Applying a deformation excitation to the flexible inner wall plate through the through holes, so that at least part of the flexible inner wall plate deforms perpendicular to the radial direction of the flexible inner wall plate, so as to change the radial distance between the deformed part of the flexible inner wall plate and the tip of the rotor blade of the compressor; the deformation excitation includes temperature excitation and air pressure difference excitation.

2. The casing of the compressor according to claim 1, characterized in that, The casing outer shell further includes: A limiting part, located inside the groove, and the limiting part is used to limit the axial position of the flexible inner wall plate; A plurality of pin holes, arranged above and below the groove, and the pin holes are used to fix the flexible inner wall plate in the limiting part.

3. The casing of the compressor according to claim 1, characterized in that, Further comprising: A temperature sensor, arranged on the flexible inner wall plate, and the temperature sensor is used to monitor the temperature of the flexible inner wall plate when a temperature excitation is applied to the flexible inner wall plate; A pressure sensor, arranged in the through hole, and the pressure sensor is used to monitor the air pressure in the through hole when an air pressure difference excitation is applied to the flexible inner wall plate.

4. A flow control method based on the casing according to any one of claims 1-3, characterized in that, Comprising: When receiving an instruction to change the radial distance between the deformed part of the flexible inner wall plate and the tip of the rotor blade of the compressor, filling hot air into each of the through holes until the temperature of the flexible inner wall plate rises to the target phase change temperature of the flexible inner wall plate; Forming an air pressure difference between the inside of each of the through holes and the outside of the casing outer shell, so that at least part of the flexible inner wall plate deforms perpendicular to the radial direction of the flexible inner wall plate, so as to change the radial distance between the deformed part of the flexible inner wall plate and the tip of the rotor blade of the compressor.

5. The method according to claim 4, wherein When the instruction is to increase the radial distance, the forming an air pressure difference between the inside of each of the through holes and the outside of the casing outer shell, so that at least part of the flexible inner wall plate deforms perpendicular to the radial direction of the flexible inner wall plate, so as to change the radial distance between the deformed part of the flexible inner wall plate and the tip of the rotor blade of the compressor, includes: Filling a negative pressure for a first set time into each of the through holes, so that at least part of the flexible inner wall plate deforms perpendicular to the radial direction of the flexible inner wall plate, so as to increase the radial distance between the deformed part of the flexible inner wall plate and the tip of the rotor blade of the compressor; wherein, the increased radial distance is the target increased value carried in the instruction.

6. The method according to claim 4, wherein When the instruction is to decrease the radial distance, the forming an air pressure difference between the inside of each of the through holes and the outside of the casing outer shell, so that at least part of the flexible inner wall plate deforms perpendicular to the radial direction of the flexible inner wall plate, so as to change the radial distance between the deformed part of the flexible inner wall plate and the tip of the rotor blade of the compressor, includes: Fill each of the through holes with positive-pressure cold air for a second set duration, so that at least part of the flexible inner wall panel deforms perpendicularly to the radial direction of the flexible inner wall panel, thereby reducing the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor; wherein, the reduced radial distance is the target reduction value carried in the instruction.

7. The method according to claim 5, wherein The first set duration is determined in the following manner: Based on negative pressures with different phase change temperature values and different pressure values, formulate a corresponding database of the increase speed relationship of the radial distance; Based on the target phase change temperature, the pressure value of the currently filled negative pressure, and the increase speed relationship database, determine the current increase speed of the radial distance; Based on the target increase value of the radial distance and the current increase speed of the radial distance, determine the first set duration.

8. The method according to claim 5, wherein After increasing the radial distance between the deformed part of the flexible inner wall panel and the tip of the rotor blade of the compressor, it further includes: Fill each of the through holes with cold air to quickly cool the flexible inner wall panel below the minimum phase change temperature value.

9. The method according to claim 6, characterized in that, The target phase change temperature is the minimum phase change temperature value of the flexible inner wall panel; The second set duration is determined in the following manner: Based on the target phase change temperature, positive-pressure cold air with different pressure values, and positive-pressure cold air with different temperatures, formulate a corresponding database of the decrease speed relationship of the radial distance; Based on the pressure value, temperature of the currently filled positive-pressure cold air, and the decrease speed relationship database, determine the current decrease speed of the radial distance; Based on the target reduction value of the radial distance and the current decrease speed of the radial distance, determine the second set duration.

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