Centrifugal compressor, test device and readable storage medium

Abstract

Centrifugal compressor for use in a compressed air energy storage system, characterized in that the centrifugal compressor comprises the following: an inlet channel (1) that can be used to supply fluid working medium; an inlet guide vane assembly (2) arranged on the inlet channel (1); an impeller assembly (3) which is arranged downstream of the inlet guide vane assembly (2) and is usable to carry out a dynamic pressure increase and acceleration of the fluid working medium supplied through the inlet channel (1); a diffuser assembly (4) which is arranged downstream of the impeller assembly (3) and is usable to perform a static deceleration and pressure increase on the fluid working medium coming from the impeller assembly (3); a spiral casing assembly (5) which is arranged downstream of the diffuser assembly (4) and is usable to perform a static deceleration and pressure increase on the fluid working medium coming from the diffuser assembly (4) and to achieve a guiding and bundling function for the fluid working medium; an outlet channel (6) located downstream of the spiral casing assembly (5) to discharge the working fluid; and wherein a detection assembly is arranged at each of the pressure stabilization section of the inlet channel (1), the inlet and outlet of the inlet guide vane assembly (2), the inlet and outlet of the impeller assembly (3), the inlet and outlet of the diffuser assembly (4), the fit between the diffuser assembly (4) and the impeller assembly (3), the fit between the diffuser assembly (4) and the spiral casing assembly (5) and the pressure stabilization section of the outlet channel (6), which is usable to detect the flow parameters and the ambient parameters of the working fluid at a preset position.

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of compressors, in particular a centrifugal compressor, a test device for implementing a flow test method and a readable storage medium. STATE OF THE ART

[0002] The centrifugal compressor is the core component of a multi-stage centrifugal or axial centrifugal compressor in a commonly used compressed air energy storage system, and the flow performance of the internal fluid of the centrifugal compressor has a significant impact on the efficiency of the entire machine, the pressure ratio, and the range of variable operating conditions, etc.

[0003] Currently, performance testing of centrifugal compressors typically involves placing a sensor at both the inlet and outlet of the entire unit to obtain aerodynamic parameters under various operating conditions. This allows for the analysis of the overall efficiency, pressure ratio, and energy loss. However, these tests only analyze the overall performance of the centrifugal compressor based on the aerodynamic parameters of the inlet and outlet. It is difficult to thoroughly investigate the internal flow mechanisms and optimization pathways of the centrifugal compressor. The overall performance of the unit is reflected not only in the external characteristics of the inlet and outlet but also in the superposition of the internal flow properties of the various subassemblies.The existing technology does not take into account the internal flow characteristics of the sub-assemblies inside the centrifugal compressor and their impact on the overall performance of the centrifugal compressor, which makes it difficult to guarantee the reliability, accuracy and completeness of the test results, and it is difficult to effectively guide the optimization of the design of the entire machine and its sub-assemblies. CONTENT OF THE PRESENT APPLICATION

[0004] One purpose of the present application is to solve at least the technical problems arising from the fact that performance testing of centrifugal compressors does not thoroughly consider the internal flow characteristics of the subassemblies within the centrifugal compressor and their impact on the overall performance of the centrifugal compressor. This makes it difficult to guarantee the reliability, accuracy, and completeness of the test results and hinders effective guidance in optimizing the design of the entire machine and its subassemblies. This purpose is achieved through the following technical solutions: In a first aspect, the present application provides a centrifugal compressor for use in a compressed air energy storage system, wherein the centrifugal compressor comprises an inlet channel, an inlet guide vane assembly, an impeller assembly, a diffuser assembly, a volute casing assembly, and an outlet channel, wherein the inlet channel is usable for or configured to supply working fluid; and wherein the inlet guide vane assembly is arranged on the inlet channel; and wherein the impeller assembly is arranged downstream of the inlet guide vane assembly and is usable for performing a dynamic pressure increase and acceleration of the working fluid supplied through the inlet channel; and wherein the diffuser assembly is arranged downstream of the impeller assembly and is usable for performing a static deceleration and pressure increase of the working fluid coming from the impeller assembly;and wherein the spiral casing assembly is arranged downstream of the diffuser assembly and is usable to perform a static deceleration and pressure increase on the working fluid coming from the diffuser assembly and to achieve a guiding and bundling function for the working fluid; and wherein the outlet channel is arranged downstream of the spiral casing assembly to discharge the working fluid;and wherein a detection assembly is arranged at each of the pressure stabilization section of the inlet channel, the inlet and outlet of the inlet guide vane assembly, the inlet and outlet of the impeller assembly, the inlet and outlet of the diffuser assembly, the fitting clearance between the diffuser assembly and the impeller assembly, the fitting clearance between the diffuser assembly and the volute casing assembly, and the pressure stabilization section of the outlet channel, which is usable for detecting the flow parameters and the environmental parameters of the working fluid at a preset position.

[0005] In the centrifugal compressor of the present application, a detection assembly is arranged at each of the pressure stabilization section of the inlet channel, the inlet and outlet of the inlet guide vane assembly, the inlet and outlet of the impeller assembly, the inlet and outlet of the diffuser assembly, the fit between the diffuser assembly and the impeller assembly, the fit between the diffuser assembly and the volute casing assembly, and the pressure stabilization section of the outlet channel. This detection assembly is used to detect the flow parameters and the environmental parameters of the working fluid at a preset position. By analyzing the flow parameters and the environmental parameters of the working fluid at the preset position, the external properties of the entire centrifugal compressor machine and the internal flow properties of the subassemblies can be comprehensively analyzed.The present application takes into account the changes in the flow characteristics of the working fluid at each position within the centrifugal compressor, and the overall performance of the centrifugal compressor and the internal energy loss can be derived from an analysis of the fluid characteristics of the internal position, which improves the accuracy of the test results and is conducive to optimizing the design of the entire machine and the internal subassemblies.

[0006] In some embodiments, the impeller assembly comprises a wheel cover and an impeller, wherein the wheel cover is connected to the inlet channel and the diffuser assembly, and wherein the impeller is rotatably arranged inside the wheel cover, and wherein an upper impeller gap is provided between the circumferential direction of the impeller and the wheel cover, at which a detection assembly is arranged.

[0007] In some embodiments, a wheel disc cavity is provided between one side of the wheel facing away from the inlet guide grid assembly and the wheel cover, on which a detection assembly is arranged.

[0008] In some embodiments, the inlet guide grille assembly is rotatably arranged on the inlet channel, wherein an inlet guide grille fit is provided between the inlet guide grille assembly and the inner wall of the inlet channel, on which a detection assembly is arranged.

[0009] In some embodiments, the diffuser angle of the diffuser assembly can be adjusted so that it can be adapted to the direction of the working fluid flowing out of the impeller assembly.

[0010] In some embodiments, the diffuser assembly comprises a diffuser cavity and a diffuser blade rotatably arranged in the diffuser cavity, wherein the diffuser blade has a diffuser channel, and wherein a diffuser fit is provided between the diffuser blade and the inner wall of the diffuser cavity, on which a detection assembly is arranged.

[0011] In some embodiments, the detection assembly comprises at least one contact sensor and one non-contact sensor.

[0012] In a second aspect, the present application provides a test device for implementing a flow test procedure for a centrifugal compressor mentioned above, the flow test procedure comprising the following steps: Setting the operating parameters of the centrifugal compressor; Acquiring the flow parameters of the centrifugal compressor, wherein the flow parameters of the centrifugal compressor include the external characteristic parameters of the working fluid at the inlet and outlet of the entire machine of the centrifugal compressor and the flow parameters and environmental parameters of the working fluid at the inlet and outlet of each subassembly inside the centrifugal compressor and the clearance between each subassembly; Analyzing the external total performance and internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor.

[0013] In some embodiments, setting the operating parameters of the centrifugal compressor includes the following: Adjusting the flow rate of the working fluid in the inlet channel of the centrifugal compressor; and / or adjusting the operating speed of the impeller of the impeller assembly of the centrifugal compressor; and / or adjusting the angle of the inlet guide vane assembly of the centrifugal compressor; and / or adjusting the diffuser angle of the diffuser assembly of the centrifugal compressor.

[0014] In some embodiments, the external characteristic parameters of the working fluid at the inlet and outlet of the entire centrifugal compressor machine include the flow parameters and the environmental parameters of the working fluid at the pressure stabilization sections of the inlet and outlet channels of the centrifugal compressor.

[0015] In some embodiments, the flow parameters of the working fluid at the inlet and outlet of each subassembly inside the centrifugal compressor and the clearance between each subassembly include the following: the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of the inlet guide vane assembly of the centrifugal compressor; the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of the impeller assembly of the centrifugal compressor; the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of the diffuser assembly of the centrifugal compressor; the flow parameters and the ambient parameters of the working fluid at the clearance between the diffuser assembly and the impeller assembly;the flow parameters and the environmental parameters of the working fluid at the fit between the diffuser assembly and the spiral casing assembly of the centrifugal compressor.;

[0016] In some embodiments, analyzing the external total performance and internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor includes the following: analyzing the diffusion mechanism of the diffuser assembly based on the recorded flow parameters and environmental parameters of the working fluid at the inlet and outlet of the diffuser assembly of the centrifugal compressor.

[0017] In some embodiments, the centrifugal compressor comprises an impeller assembly comprising an impeller cover and an impeller rotatably arranged inside the impeller cover, wherein an upper impeller gap is provided between the circumferential direction of the impeller and the impeller cover, and wherein the flow parameters of the centrifugal compressor further comprise the flow parameters and the ambient parameters of the working fluid in the upper impeller gap.

[0018] In some embodiments, analyzing the total external performance and internal fluid flow characteristics of the centrifugal compressor based on the acquired flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the upper impeller gap and their effects on the total performance of the centrifugal compressor and the internal flow field based on the acquired flow parameters and ambient parameters of the working fluid in the upper impeller gap between the circumferential direction of the impeller and the impeller cover.

[0019] In some embodiments, a wheel disc cavity is provided between one side of the impeller facing away from the inlet guide vane assembly of the centrifugal compressor and the wheel cover, wherein the flow parameters of the centrifugal compressor further include the flow parameters and the ambient parameters of the working fluid in the wheel disc cavity.

[0020] In some embodiments, analyzing the total external performance and internal fluid flow characteristics of the centrifugal compressor based on the acquired flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the impeller cavity and their effects on the total performance of the centrifugal compressor and the internal flow field based on the acquired flow parameters and environmental parameters of the working fluid in the impeller cavity.

[0021] In some embodiments, the centrifugal compressor comprises an inlet channel and an inlet guide vane assembly arranged in the inlet channel, wherein an inlet guide vane fit is provided between the inlet guide vane assembly and the inner wall of the inlet channel, wherein the flow parameters of the centrifugal compressor further comprise the flow parameters and the ambient parameters of the working fluid in the inlet guide vane fit between the inlet guide vane assembly and the inner wall of the inlet channel.

[0022] In some embodiments, analyzing the total external performance and internal fluid flow characteristics of the centrifugal compressor based on the acquired flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the inlet guide vane clearance and their effects on the total performance of the centrifugal compressor and the internal flow field based on the acquired flow parameters and ambient parameters of the working fluid in the inlet guide vane clearance.

[0023] In some embodiments, the diffuser assembly comprises a diffuser cavity and a diffuser blade rotatably arranged in the diffuser cavity, wherein the diffuser blade has a diffuser channel, and wherein a diffuser clearance is provided between the diffuser blade and the inner wall of the diffuser cavity, and wherein the flow parameters of the centrifugal compressor further comprise the flow parameters and the ambient parameters of the working fluid in the diffuser clearance between the diffuser blade and the inner wall of the diffuser cavity.

[0024] In some embodiments, analyzing the overall external performance and internal fluid flow characteristics of the centrifugal compressor based on the acquired flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the diffuser clearance and their effects on the overall performance of the centrifugal compressor and the internal flow field based on the acquired flow parameters and environmental parameters of the working fluid in the diffuser clearance.

[0025] In some embodiments, the external characteristic parameters of the working fluid include at least one of the following parameters: pressure ratio, temperature ratio, torque, shaft power, mechanical efficiency, isothermal efficiency, isentropic efficiency, adiabatic efficiency, stability margin, surge margin, specific work, and leakage rate of the working fluid.

[0026] In some embodiments, the flow parameters of the working fluid include at least one of the following parameters: pressure, temperature, velocity, flow rate, vibration displacement, phase concentration, viscosity, Reynolds number, and surface tension of the working fluid.

[0027] In some embodiments, the environmental parameters of the working fluid include at least one of the following parameters: sound pressure decibels, humidity, surface roughness, and wear of the environment in which the working fluid is located.

[0028] In a third aspect, the present application provides the test device, wherein the test device comprises a control module, a detection module and an analysis module, and wherein the control module is usable for setting the operating parameters of the centrifugal compressor, and wherein the detection module is usable for detecting the flow parameters of the centrifugal compressor, and wherein the flow parameters of the centrifugal compressor comprise the external characteristic parameters of the working fluid at the inlet and outlet of the entire machine of the centrifugal compressor and the flow parameters and the environmental parameters of the working fluid at the inlet and outlet of each subassembly inside the centrifugal compressor and the clearance between each subassembly;and wherein the analysis module can be used to analyze the total external performance and the internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor.

[0029] In a fourth aspect, the present invention provides a readable storage medium in which computer instructions are stored, wherein, when the computer instructions are executed, the above flow testing method of a test device is performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Several other advantages and benefits will become apparent to the person skilled in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings serve only to illustrate the preferred embodiments and are not considered to limit the present application. Furthermore, the same components are designated by the same reference numerals in all drawings. Fig. Figure 1 shows an overall cross-section of a centrifugal compressor in an embodiment of the present application; Fig. Figure 2 shows a schematic diagram of the axial side structure of a centrifugal compressor in an embodiment of the present application, looking inwards along an inlet of an inlet channel; Fig. Figure 3 shows a flowchart of the main steps of a flow test procedure for a centrifugal compressor in an embodiment of the present application; Fig. Figure 4 shows a flow diagram of the detailed steps of a flow test procedure for a centrifugal compressor in an embodiment of the present application. Reference symbol list 1 Inlet channel 2 Inlet guide grille assembly 3. Wheel assembly 31 wheel 4 Diffuser assembly 41 Diffuser blade 5 spiral casing assembly 6 Outlet channel 7 Inlet guide grille fit clearance 8 Upper impeller gap 9 Wheel disc cavity 10 Diffuser Fitting Game DETAILED DESCRIPTION

[0031] In conjunction with the accompanying drawings, the exemplary embodiments of this publication are explained in more detail below. Although the accompanying drawings depict exemplary embodiments of this publication, it should be understood that this publication can be implemented in various forms without being limited to the embodiments shown here. On the contrary, these embodiments are used to facilitate a more thorough understanding of this publication and to fully convey its scope to those skilled in the art.

[0032] It is understood that the terms used in the text serve solely to describe specific examples and are not to be understood as limiting. The singular forms "a," "an," and "the said" used in the text can also include the plural form unless the context clearly indicates otherwise. The terms "comprise," "consisting of," and "exhibit" are all-encompassing and thus indicate the presence of the specified features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0033] Although the terms “first”, “second”, etc. may be used in the text to describe a variety of elements, assemblies, areas, layers, and / or segments, such elements, assemblies, areas, layers, and / or segments should not be restricted by these terms. These terms may only be used to distinguish one element, assembly, area, layer, or segment from another. Terms such as “first”, “second”, and other numerical terms are used in the text in a manner that does not imply any order unless the context clearly indicates otherwise. Unless expressly specified and restricted otherwise in the explanatory notes to this application, the terms “arranged” and “connected” should be understood in a broader sense, e.g.,It can be a fixed connection, a detachable connection, or an integrated connection; it can be a direct connection or a connection via a medium. A person skilled in the art in this field can understand the specific meanings of the foregoing terms in the present application based on the specific situations.

[0034] To simplify the description, spatial relativity terms can be used in the text to describe the relationship of one element or feature to another, as depicted in the figures, e.g., "top," "bottom," "inside," "outside," "end," "side," and the like. Such terms for spatial relationships should include various orientations of the mechanism in use or operation that differ from those shown in the drawings.

[0035] Examples of embodiments of the present application are described below in conjunction with Fig. Sections 1 to 4 of the description are explained.

[0036] As in Fig. 1 and Fig. Figure 2 shows an embodiment of the present invention, which discloses, on the one hand, a centrifugal compressor used for a compressed air energy storage system, wherein the centrifugal compressor comprises an inlet channel 1, an inlet guide vane assembly 2, an impeller assembly 3, a diffuser assembly 4, a spiral casing assembly 5 and an outlet channel 6, wherein the inlet channel 1 is used to supply working fluid; and wherein the inlet guide vane assembly 2 is arranged on the inlet channel 1; and wherein the impeller assembly 3 is arranged downstream of the inlet guide vane assembly 2 and is used to perform a dynamic pressure increase and acceleration of the working fluid supplied through the inlet channel 1;and wherein the diffuser assembly 4 is arranged downstream of the impeller assembly 3 and is used to perform a static deceleration and pressure increase on the working fluid coming from the impeller assembly 3; and wherein the volute casing assembly 5 is arranged downstream of the diffuser assembly 4 and is used to perform a static deceleration and pressure increase on the working fluid coming from the diffuser assembly 4 and to achieve a guiding and bundling function for the working fluid; and wherein the outlet channel 6 is arranged downstream of the volute casing assembly 5 to discharge the working fluid;and wherein a detection assembly is arranged at each of the pressure stabilization section of the inlet channel 1, the inlet and outlet of the inlet guide vane assembly 2, the inlet and outlet of the impeller assembly 3, the inlet and outlet of the diffuser assembly 4, the fitting clearance between the diffuser assembly 4 and the impeller assembly 3, the fitting clearance between the diffuser assembly 4 and the volute casing assembly 5 and the pressure stabilization section of the outlet channel 6, which is used to detect the flow parameters and the ambient parameters of the working fluid at a preset position.

[0037] In the centrifugal compressor of the present application, a detection assembly is arranged at each of the pressure stabilization section of the inlet channel 1, the inlet and outlet of the inlet guide vane assembly 2, the inlet and outlet of the impeller assembly 3, the inlet and outlet of the diffuser assembly 4, the fit between the diffuser assembly 4 and the impeller assembly 3, the fit between the diffuser assembly 4 and the volute casing assembly 5 and the pressure stabilization section of the outlet channel 6. This detection assembly is used to detect the flow parameters and the environmental parameters of the working fluid at a preset position. By analyzing the flow parameters and the environmental parameters of the working fluid at the preset position, the external properties of the entire centrifugal compressor machine and the internal flow properties of the subassemblies can be comprehensively analyzed.The present application takes into account the changes in the flow characteristics of the working fluid at each position within the centrifugal compressor, and the overall performance of the centrifugal compressor and the internal energy loss can be derived from an analysis of the fluid characteristics of the internal position, which improves the accuracy of the test results and is conducive to optimizing the design of the entire machine and the internal subassemblies.

[0038] The compressed air energy storage system has the potential advantages of not being limited by geographical conditions, having a large single-stage capacity, high storage efficiency, and a long lifespan. It can recover waste heat, combine complementary wind and solar power, and be applicable to a new power supply system in areas such as deserts and Gobi Deserts, and deep and distant seas. Therefore, the compressed air energy storage system is considered a promising technology for large-scale physical energy storage. The compressor's function is to convert the energy to be stored into the internal energy and potential pressure energy of the working fluid, and its energy conversion efficiency directly impacts the overall efficiency of the compressed air energy storage system and the economic viability of energy storage.The centrifugal compressor is the core component of a multi-stage centrifugal compressor or an axial centrifugal compressor in a commonly used compressed air energy storage system, and its flow performance has a significant impact on the efficiency of the entire machine, the pressure ratio, and the range of variable operating conditions, etc. Therefore, an efficient, accurate, and reliable testing and analysis procedure is of paramount importance for optimizing the design of the centrifugal compressor.

[0039] The design of a centrifugal compressor must be based on a deep understanding of the aerodynamic properties and internal flow mechanisms of a single-stage centrifugal compressor (model stage). A certain amount of experimental data must be collected on highly efficient model stages with varying flow coefficients to optimize the selection of compressor stages suitable for centrifugal compressor needs at all levels. For typical aerodynamic performance, the internal flow of the entire machine is tested to gather valuable real-world data, and the internal flow field mechanism is analyzed to enable further efficient design optimization and highly accurate performance prediction. Currently available literature and techniques offer extremely limited methods and results for flow testing within centrifugal compressors.Most work is limited to basic industrial performance tests of the external characteristic maps, while scientific investigations of the internal fluid mechanics are rare, and there are no systematic tests across the entire flow domain, coupling adjustment under variable operating conditions, full operating conditions trials, and full flow field measurements.

[0040] It should be noted that the pressure stabilization section of inlet duct 1 is located between the outlet of inlet duct 1 and the inlet guide vane assembly 2. The pressure stabilization section of outlet duct 6 is located between the outlet of outlet duct 6 and the spiral casing assembly 5.

[0041] In some embodiments, the impeller assembly 3 comprises a wheel cover and an impeller 31, wherein the wheel cover is connected to the inlet channel 1 and the diffuser assembly 4, and wherein the impeller 31 is rotatably arranged inside the wheel cover, and wherein an upper impeller gap 8 is provided between the circumferential direction of the impeller 31 and the wheel cover, at which a detection assembly is arranged.

[0042] The impeller 31 rotates to create a vacuum, causing the working fluid to flow over the impeller 31 to the diffuser assembly 4. An upper impeller gap 8 is provided between the impeller 31 and the inner wall of the wheel cover. The detection assembly provided at the upper impeller gap 8 can detect the working fluid flowing through the upper impeller gap 8 in order to analyze the fluid properties at the upper impeller gap 8 and to determine the energy loss of the working fluid at the upper impeller gap 8.

[0043] It is understood that the impeller assembly 3 further comprises an electric motor for the impeller 31, wherein the electric motor for the impeller 31 is connected to the impeller 31 to drive the impeller 31 to rotate and generate a vacuum. In the present embodiment, the power of the electric motor for the impeller 31 is adjustable, so that the rotational speed of the impeller 31 is achieved by controlling the power of the electric motor for the impeller 31.

[0044] In some embodiments, a wheel disc cavity 9 is provided between one side of the wheel 31 facing away from the inlet guide grid assembly 2 and the wheel cover, on which a detection assembly is arranged.

[0045] The detection assembly provided at the wheel disc cavity 9 can detect the fluid working medium flowing through the wheel disc cavity 9 in order to analyze the fluid properties at the wheel disc cavity 9 and to determine the energy loss of the fluid working medium at the wheel disc cavity 9.

[0046] In some embodiments, the inlet guide grille assembly 2 is rotatably arranged on the inlet channel 1, wherein an inlet guide grille fit 7 is provided between the inlet guide grille assembly 2 and the inner wall of the inlet channel 1, on which a detection assembly is arranged.

[0047] By rotating the inlet guide vane assembly 2, the flow direction of the working fluid can be adjusted so that it flows better towards the downstream impeller assembly 3, and the detection assembly provided at the inlet guide vane clearance 7 can detect the working fluid flowing through the inlet guide vane clearance 7 in order to analyze the fluid properties at the inlet guide vane clearance 7 and to determine the energy loss of the working fluid at the inlet guide vane clearance 7.

[0048] In some embodiments, the diffuser angle of the diffuser assembly 4 can be adjusted so that it can be adapted to the direction of the working fluid flowing out of the impeller assembly 3.

[0049] By adjusting the diffuser angle of the diffuser assembly 4 so that it can be adapted according to the direction of the working fluid flowing from the impeller assembly 3, the working fluid flowing from the impeller assembly 3 can flow smoothly to the diffuser assembly 4 in order to reduce the impact loss caused during the flow of the working fluid to the diffuser assembly 4, which improves flow efficiency, avoids the phenomenon of fluid clogging at the leading edge of the blades of the diffuser assembly 4 and thus improves the performance under variable operating conditions.

[0050] The adjustment strategy of the diffuser assembly 4 is particularly related to the impact angle of the incoming working fluid, and the diffuser assembly 4 can be adjusted together with the angle of the inlet guide vane assembly 2.

[0051] In some embodiments, the diffuser assembly 4 comprises a diffuser cavity and a diffuser blade rotatably arranged in the diffuser cavity, wherein the diffuser blade has a diffuser channel, and wherein a diffuser fit 10 is provided between the diffuser blade and the inner wall of the diffuser cavity, on which a detection assembly is arranged.

[0052] By rotating the diffuser blade, the inclination of the diffuser channel is changed in order to adjust the diffuser angle of the diffuser assembly 4, and the detection assembly provided at the diffuser clearance 10 can detect the fluid working medium flowing through the diffuser clearance 10 in order to analyze the fluid properties at the diffuser clearance 10 and to determine the energy loss of the fluid working medium at the diffuser clearance 10.

[0053] In some embodiments, the detection assembly comprises at least one contact sensor and one non-contact sensor.

[0054] The contact sensor and the non-contact sensor can detect the working fluid as required in order to determine its flow parameters and the environmental parameters.

[0055] The contact sensor can be, in particular, at least one of the following: a piezoresistive pressure sensor, a strain gauge manometer, a thermocouple, a resistance thermometer, a turbine flow meter, a magnetic flow meter, a differential pressure flow meter, a target flow meter, an accelerometer, a strain gauge, a conductivity sensor, a capacitance sensor, a rotational viscometer, a capillary viscometer, a multiparameter combination sensor, a loop method sensor, a platinum plate method sensor, a contact microphone, a capacitive hygrometer, a stylus profilometer, a displacement sensor, and a strain gauge.

[0056] The non-contact sensor can be, in particular, at least one of the following: a piezoelectric pressure sensor, a capacitive pressure sensor, an infrared thermometer, an ultrasonic flow meter, a laser Doppler velocimeter (LDV), a non-contact electromagnetic flow meter, an ultrasonic flow meter, a laser vibrometer, a NIR spectroscopic sensor, a microwave sensor, a microwave / radio frequency sensor, a non-contact flow meter + viscosity sensor, a laser surface roughness measuring device, a laser microphone, an infrared humidity sensor, a microwave humidity sensor, a laser interferometer, a white light interferometer, an ultrasonic thickness gauge, and an optical 3D scanner.

[0057] It should be noted that the structures of the centrifugal compressor, such as the inlet channel 1, the inlet guide vane assembly 2, the impeller assembly 3, the diffuser assembly 4, the spiral casing assembly 5 and the outlet channel 6, etc., are all part of the prior art and are not explained in detail in the present embodiment.

[0058] As in Fig. Figures 1 to 4 further disclose a flow testing method comprising the following steps: Setting the operating parameters of the centrifugal compressor; Acquiring the flow parameters of the centrifugal compressor, wherein the flow parameters of the centrifugal compressor include the external characteristic parameters of the working fluid at the inlet and outlet of the entire machine of the centrifugal compressor and the flow parameters and environmental parameters of the working fluid at the inlet and outlet of each subassembly inside the centrifugal compressor and the clearance between each subassembly; Analyzing the external total performance and internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor.

[0059] Since the flow test method of the present application is used in the centrifugal compressor of the present application, the flow test method of the present application has the same technical effect as the centrifugal compressor, as described in detail above, which will not be repeated here.

[0060] The flow parameters of the centrifugal compressor can be obtained directly or indirectly, with the choice of means being arbitrary and not limited in the present embodiment.

[0061] In some embodiments, setting the operating parameters of the centrifugal compressor includes the following: Adjusting the flow rate of the working fluid in the inlet channel 1 of the centrifugal compressor; and / or adjusting the operating speed of the impeller 31 of the impeller assembly 3 of the centrifugal compressor; and / or adjusting the angle of the inlet guide vane assembly 2 of the centrifugal compressor; and / or adjusting the diffuser angle of diffuser assembly 4 of the centrifugal compressor. Depending on requirements, by adjusting one or more of the above-mentioned parameters, the testing of the centrifugal compressor under variable operating conditions can be achieved in order to obtain more analytical data, facilitate comparative analysis, and improve the accuracy and scope of the test.

[0062] In the present embodiment, the above-mentioned parameters are set one after the other, depending on the testing requirements, in order to analyze the performance of the centrifugal compressor at different flow rates, different operating speeds, different guide angles and different diffuser angles.

[0063] In some embodiments, the external characteristic parameters of the working fluid at the inlet and outlet of the entire machine of the centrifugal compressor include the flow parameters and the environmental parameters of the working fluid at the pressure stabilization sections of the inlet channel 1 and the outlet channel 6 of the centrifugal compressor.

[0064] The flow parameters and environmental parameters of the working fluid at the pressure stabilization sections of the inlet channel 1 and outlet channel 6 of the centrifugal compressor can reflect the external characteristic parameters of the working fluid at the inlet and outlet of the entire machine, which is beneficial for the analysis of the external characterization of the entire machine.

[0065] In some embodiments, the flow parameters of the working fluid at the inlet and outlet of each subassembly inside the centrifugal compressor and the clearance between each subassembly include the following: the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of the inlet guide vane assembly 2 of the centrifugal compressor; the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of the impeller assembly 3 of the centrifugal compressor; the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of the diffuser assembly 4 of the centrifugal compressor; the flow parameters and the ambient parameters of the working fluid at the clearance between the diffuser assembly 4 and the impeller assembly 3;the flow parameters and the environmental parameters of the working fluid at the fit between the diffuser assembly 4 and the spiral casing assembly 5 of the centrifugal compressor.;

[0066] The flow parameters and environmental parameters of the working fluid at the inlet and outlet of the inlet guide vane assembly 2 of the centrifugal compressor, the inlet and outlet of the impeller assembly 3 of the centrifugal compressor, the inlet and outlet of the diffuser assembly 4 of the centrifugal compressor, the clearance between the diffuser assembly 4 and the impeller assembly 3, and the clearance between the diffuser assembly 4 and the volute casing assembly 5 of the centrifugal compressor reflect the flow parameters of the working fluid at the inlet and outlet of each sub-assembly inside the centrifugal compressor and the clearance between each sub-assembly, which is helpful for analyzing the performance inside the entire machine in detail.

[0067] In some embodiments, analyzing the total external performance and internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor includes the following: analyzing the diffusion mechanism of the diffuser assembly 4 based on the recorded flow parameters and ambient parameters of the working fluid at the inlet and outlet of the diffuser assembly 4 of the centrifugal compressor.

[0068] By analyzing the flow parameters and environmental parameters of the working fluid at the inlet and outlet of the diffuser assembly 4, the diffusion mechanism of the diffuser assembly 4 can be obtained in order to evaluate the overall performance of the diffuser assembly 4 and thus facilitate a subsequent optimization of the design.

[0069] In some embodiments, the centrifugal compressor comprises an impeller assembly 3, which includes an impeller cover and an impeller 31 rotatably arranged inside the impeller cover, wherein an upper impeller gap 8 is provided between the circumferential direction of the impeller 31 and the impeller cover, and wherein the flow parameters of the centrifugal compressor further include the flow parameters and the ambient parameters of the working fluid in the upper impeller gap 8.

[0070] The impeller 31 rotates to create a vacuum, causing the working fluid to flow through the impeller 31 to the diffuser assembly 4. Between the circumferential direction of the impeller 31 and the wheel cover, there is necessarily an upper impeller gap 8. The flow parameters of the centrifugal compressor also include the flow parameters and the ambient parameters of the working fluid in the upper impeller gap 8, thus making the test data more comprehensive and accurate.

[0071] In some embodiments, the analysis of the total external performance and the internal fluid flow characteristics of the centrifugal compressor based on the acquired flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the upper impeller gap 8 and their effects on the total performance of the centrifugal compressor and the internal flow field based on the acquired flow parameters and ambient parameters of the working fluid in the upper impeller gap 8 between the circumferential direction of the impeller 31 and the impeller cover.

[0072] Using the recorded flow parameters and environmental parameters of the working fluid in the upper impeller gap 8, it is possible to analyze the internal fluid flow properties of the upper impeller gap 8 in order to analyze the energy loss of the working fluid at the upper impeller gap 8 and its effects on the overall performance of the centrifugal compressor and the internal flow field.

[0073] In some embodiments, a wheel disc cavity 9 is provided between one side of the impeller 31 facing away from the inlet guide grid assembly 2 of the centrifugal compressor and the wheel cover, wherein the flow parameters of the centrifugal compressor further include the flow parameters and the ambient parameters of the working fluid in the wheel disc cavity 9.

[0074] A wheel disc cavity 9 is provided between one side of the impeller 31 facing away from the inlet guide vane assembly 2 of the centrifugal compressor and the wheel cover, wherein the flow parameters of the centrifugal compressor continue to include the flow parameters and the ambient parameters of the working fluid in the wheel disc cavity 9, which makes the test data even more comprehensive and improves the accuracy of the test results.

[0075] In some embodiments, the analysis of the total external performance and the internal fluid flow characteristics of the centrifugal compressor based on the acquired flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the impeller cavity 9 and their effects on the total performance of the centrifugal compressor and the internal flow field based on the acquired flow parameters and environmental parameters of the working fluid in the impeller cavity 9.

[0076] Using the recorded flow parameters and environmental parameters of the working fluid in the wheel disc cavity 9, it is possible to analyze the internal fluid flow properties of the wheel disc cavity 9 in order to analyze the energy loss of the working fluid at the wheel disc cavity 9 and its effects on the overall performance of the centrifugal compressor and the internal flow field.

[0077] In some embodiments, the centrifugal compressor comprises an inlet channel 1 and an inlet guide vane assembly 2 arranged in the inlet channel 1, wherein an inlet guide vane fit 7 is provided between the inlet guide vane assembly 2 and the inner wall of the inlet channel 1, wherein the flow parameters of the centrifugal compressor further comprise the flow parameters and the ambient parameters of the working fluid in the inlet guide vane fit 7 between the inlet guide vane assembly 2 and the inner wall of the inlet channel 1.

[0078] Between the inlet guide vane assembly 2 and the inner wall of the inlet channel 1, the inlet guide vane fit 7 is provided, wherein the flow parameters of the centrifugal compressor continue to include the flow parameters and the ambient parameters of the working fluid in the inlet guide vane fit 7, which makes the test data even more comprehensive and improves the accuracy of the test results.

[0079] In some embodiments, analyzing the total external performance and internal fluid flow characteristics of the centrifugal compressor based on the acquired flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the inlet guide vane clearance 7 and their effects on the total performance of the centrifugal compressor and the internal flow field based on the acquired flow parameters and ambient parameters of the working fluid in the inlet guide vane clearance 7.

[0080] Using the recorded flow parameters and environmental parameters of the working fluid in the inlet guide grid clearance 7, it is possible to analyze the internal fluid flow properties of the inlet guide grid clearance 7 in order to analyze the energy loss of the working fluid at the inlet guide grid clearance 7 and its effects on the overall performance of the centrifugal compressor and the internal flow field.

[0081] In some embodiments, the diffuser assembly 4 comprises a diffuser cavity and a diffuser blade 41 rotatably arranged in the diffuser cavity, wherein the diffuser blade 41 has a diffuser channel, and wherein a diffuser clearance 10 is provided between the diffuser blade 41 and the inner wall of the diffuser cavity, and wherein the flow parameters of the centrifugal compressor further comprise the flow parameters and the ambient parameters of the working fluid in the diffuser clearance 10 between the diffuser blade 41 and the inner wall of the diffuser cavity.

[0082] The rotation of the diffuser blade 41 adjusts the angle of the diffuser channel so that it aligns with the flow direction of the upstream working fluid. As the working fluid flows through the diffuser assembly 4, some of it escapes from the diffuser clearance 10 and does not flow through the diffuser channel. Therefore, the flow parameters of the centrifugal compressor still include the flow parameters and the ambient parameters of the working fluid within the diffuser clearance 10, thus providing more comprehensive test data and improving the accuracy of the test results.

[0083] In some embodiments, analyzing the total external performance and the internal fluid flow characteristics of the centrifugal compressor based on the acquired flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the diffuser clearance 10 and their effects on the total performance of the centrifugal compressor and the internal flow field based on the acquired flow parameters and environmental parameters of the working fluid in the diffuser clearance 10.

[0084] Using the recorded flow parameters and environmental parameters of the fluid working medium in the diffuser clearance 10, it is possible to analyze the internal fluid flow properties of the diffuser clearance 10 in order to analyze the energy loss of the fluid working medium at the diffuser clearance 10 and its effects on the overall performance of the centrifugal compressor and the internal flow field.

[0085] In some embodiments, the external characteristic parameters of the working fluid include at least one of the following parameters: pressure ratio, temperature ratio, torque, shaft power, mechanical efficiency, isothermal efficiency, isentropic efficiency, adiabatic efficiency, stability margin, surge margin, specific work, and leakage rate of the working fluid.

[0086] By determining at least one of the above-mentioned external characteristic parameters of the working fluid, the overall external performance of the centrifugal compressor can be assessed.

[0087] In some embodiments, the flow parameters of the working fluid include at least one of the following parameters: pressure, temperature, velocity, flow rate, vibration displacement, phase concentration, viscosity, Reynolds number, and surface tension of the working fluid.

[0088] In particular, pressure includes static pressure, total pressure and differential pressure; temperature includes static temperature and total temperature; flow rate includes average velocity, instantaneous velocity, absolute velocity, relative velocity and circumferential velocity; flow rate includes volumetric flow rate and mass flow rate; vibration displacement includes low frequency, medium frequency and high frequency; phase concentration includes gas-liquid and liquid-solid; viscosity includes Newtonian viscosity and non-Newtonian viscosity; Reynolds number includes laminar flow, transitional flow and turbulent flow; and surface tension includes static stress and dynamic stress.

[0089] In some embodiments, the environmental parameters of the working fluid include at least one of the following parameters: sound pressure decibels, humidity, surface roughness, and wear of the environment in which the working fluid is located.

[0090] In particular, sound pressure decibel includes fluid noise, mechanical noise and electromagnetic noise; humidity includes absolute and relative humidity; surface roughness includes average roughness and maximum peak-to-valley height; and wear includes abrasive, adhesive and fatigue wear.

[0091] The parameters mentioned above can be used to create a core database that can be used as a reference for design optimization, which helps to optimize the improved design of the centrifugal compressor.

[0092] According to the embodiment of the present invention, a test device for implementing the above flow test method for the centrifugal compressor is disclosed, wherein the test device comprises a control module, a detection module and an analysis module, and wherein the control module is used to set the operating parameters of the centrifugal compressor, and wherein the detection module is used to detect the flow parameters of the centrifugal compressor, and wherein the flow parameters of the centrifugal compressor comprise the external characteristic parameters of the working fluid at the inlet and outlet of the entire machine of the centrifugal compressor and the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of each subassembly inside the centrifugal compressor and the clearance between each subassembly;and wherein the analysis module is used to analyze the total external performance and the internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor.

[0093] Since the test apparatus of the present application is used to implement one of the above flow test methods for the centrifugal compressor, the test apparatus of the present application has the same technical effect as the flow test method for the centrifugal compressor as described in detail above, which is not repeated in the present embodiment.

[0094] According to the embodiment of the present invention, a readable storage medium is disclosed in which computer instructions are stored, wherein, when the computer instructions are executed, the above flow test method for a centrifugal compressor is performed.

[0095] Since the above flow test method for a centrifugal compressor is carried out when the computer instructions stored in the readable storage medium of the present application are executed, the readable storage medium of the present application has the same technical effect as the flow test method for the centrifugal compressor as described in detail above, which is not repeated in the present embodiment.

[0096] For example, the readable storage medium could be a flash drive, a magnetic disk, a CD and the like, but is not limited to such media, and any other storage medium that stores the flow test method for a centrifugal compressor of the present application and can be read by a computer falls within the scope of protection of the present application.

[0097] It should be noted that in the present embodiment, the working fluid can be a medium such as a gas phase, a liquid phase, a mixed gas-liquid flow, etc. For example, it could be air compressed by a centrifugal compressor.

[0098] The foregoing content is merely a detailed embodiment of the present application; however, the scope of protection of the present application is not limited thereto. Amendments or replacements that can be readily implemented by a person skilled in the art familiar with the relevant technical field within the disclosed technical scope of the present application should be considered to be covered by the scope of protection of the present application.

Claims

[1] Centrifugal compressor for use in a compressed air energy storage system, characterized by , that the centrifugal compressor includes the following: an inlet channel (1) that can be used to supply fluid working medium; an inlet guide vane assembly (2) arranged on the inlet channel (1); an impeller assembly (3) which is arranged downstream of the inlet guide vane assembly (2) and is usable to carry out a dynamic pressure increase and acceleration of the fluid working medium supplied through the inlet channel (1); a diffuser assembly (4) which is arranged downstream of the impeller assembly (3) and is usable to perform a static deceleration and pressure increase on the fluid working medium coming from the impeller assembly (3); a spiral casing assembly (5) which is arranged downstream of the diffuser assembly (4) and is usable to perform a static deceleration and pressure increase on the fluid working medium coming from the diffuser assembly (4) and to achieve a guiding and bundling function for the fluid working medium; an outlet channel (6) located downstream of the spiral casing assembly (5) to discharge the working fluid; and wherein a detection assembly is arranged at each of the pressure stabilization section of the inlet channel (1), the inlet and outlet of the inlet guide vane assembly (2), the inlet and outlet of the impeller assembly (3), the inlet and outlet of the diffuser assembly (4), the fit between the diffuser assembly (4) and the impeller assembly (3), the fit between the diffuser assembly (4) and the spiral casing assembly (5) and the pressure stabilization section of the outlet channel (6), which is usable to detect the flow parameters and the ambient parameters of the working fluid at a preset position. [2] Centrifugal compressor according to claim 1, characterized by , that the impeller assembly (3) comprises the following: a wheel cover connected to the inlet duct (1) and the diffuser assembly (4); a wheel (31) rotatably arranged inside the wheel cover, wherein an upper wheel gap (8) is provided between the circumferential direction of the wheel (31) and the wheel cover, on which a detection assembly is arranged. [3] Centrifugal compressor according to claim 2, characterized by , that a wheel disc cavity (9) is provided between one side of the wheel (31) facing away from the inlet guide grid assembly (2) and the wheel cover, in which a detection assembly is arranged. [4] Centrifugal compressor according to any of the preceding claims, characterized by , that the inlet guide grille assembly (2) is rotatably arranged on the inlet channel (1), wherein an inlet guide grille fit (7) is provided between the inlet guide grille assembly (2) and the inner wall of the inlet channel (1), on which a detection assembly is arranged. [5] Centrifugal compressor according to any of the preceding claims, characterized by, that the diffuser angle of the diffuser assembly (4) is set so that it can be adjusted according to the direction of the working fluid flowing out of the impeller assembly (3). [6] Centrifugal compressor according to claim 5, characterized by , that the diffuser assembly (4) comprises a diffuser cavity and a diffuser blade rotatably arranged in the diffuser cavity, wherein the diffuser blade has a diffuser channel, and wherein a diffuser fit (10) is provided between the diffuser blade and the inner wall of the diffuser cavity, on which a detection assembly is arranged. [7] Centrifugal compressor according to any one of claims 1 to 6, characterized by that the detection assembly includes at least one contact sensor and one non-contact sensor. [8] Test device for implementing a flow test method for a centrifugal compressor according to one of the preceding claims, characterized by, that the flow testing procedure includes the following steps: Setting the operating parameters of the centrifugal compressor; Capturing the flow parameters of the centrifugal compressor, wherein the flow parameters of the centrifugal compressor include the external characteristic parameters of the working fluid at the inlet and outlet of the entire machine of the centrifugal compressor and the flow parameters and environmental parameters of the working fluid at the inlet and outlet of each subassembly inside the centrifugal compressor and the clearance between each subassembly; Analyzing the external total performance and internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor. [9] Test device according to claim 8, characterized by , that setting the operating parameters of the centrifugal compressor includes the following: Adjusting the flow rate of the working fluid in the inlet channel (1) of the centrifugal compressor; and / or adjusting the operating speed of the impeller (31) of the impeller assembly (3) of the centrifugal compressor; and / or adjusting the angle of the inlet guide vane assembly (2) of the centrifugal compressor; and / or adjusting the diffuser angle of the diffuser assembly (4) of the centrifugal compressor. [10] Testing device according to claim 8 or 9, characterized by , that the external characteristic parameters of the working fluid at the inlet and outlet of the entire machine of the centrifugal compressor include the flow parameters and the environmental parameters of the working fluid at the pressure stabilization sections of the inlet channel (1) and the outlet channel (6) of the centrifugal compressor. [11] Testing device according to claim 8 or 9, characterized by, that the flow parameters of the working fluid at the inlet and outlet of each subassembly inside the centrifugal compressor and the fit between each subassembly include the following: the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of the inlet guide vane assembly (2) of the centrifugal compressor; the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of the impeller assembly (3) of the centrifugal compressor; the flow parameters and the ambient parameters of the working fluid at the inlet and outlet of the diffuser assembly (4) of the centrifugal compressor; the flow parameters and the ambient parameters of the working fluid at the fit between the diffuser assembly (4) and the impeller assembly (3);the flow parameters and the environmental parameters of the working fluid at the fit clearance between the diffuser assembly (4) and the spiral casing assembly (5) of the centrifugal compressor.; [12] Testing device according to claim 11, characterized by , that analyzing the total external performance and internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor includes the following: Analyzing the diffusion mechanism of the diffuser assembly (4) based on the recorded flow parameters and environmental parameters of the working fluid at the inlet and outlet of the diffuser assembly (4) of the centrifugal compressor. [13] Testing device according to claim 8 or 9, characterized by, that the centrifugal compressor comprises an impeller assembly (3) comprising an impeller cover and an impeller (31) rotatably arranged inside the impeller cover, wherein an upper impeller gap (8) is provided between the circumferential direction of the impeller (31) and the impeller cover; and wherein the flow parameters of the centrifugal compressor further comprise the flow parameters and the ambient parameters of the working fluid in the upper impeller gap (8). [14] Test device according to claim 13, characterized by, that the analysis of the total external performance and the internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the upper impeller gap (8) and their effects on the total performance of the centrifugal compressor and the internal flow field based on the recorded flow parameters and environmental parameters of the working fluid in the upper impeller gap (8) between the circumferential direction of the impeller (31) and the impeller cover. [15] Test device according to claim 13, characterized by, that a wheel disc cavity (9) is provided between one side of the impeller (31) facing away from the inlet guide vane assembly (2) of the centrifugal compressor and the wheel cover; wherein the flow parameters of the centrifugal compressor further include the flow parameters and the ambient parameters of the working fluid in the wheel disc cavity (9). [16] Test device according to claim 15, characterized by , that the analysis of the total external performance and the internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the wheel disc cavity (9) and their effects on the total performance of the centrifugal compressor and the internal flow field based on the recorded flow parameters and environmental parameters of the working fluid in the wheel disc cavity (9). [17] Test device according to any one of the preceding claims 9 to 16, characterized by , that the centrifugal compressor comprises an inlet channel (1) and an inlet guide vane assembly (2) arranged in the inlet channel (1), wherein an inlet guide vane fit (7) is provided between the inlet guide vane assembly (2) and the inner wall of the inlet channel (1); wherein the flow parameters of the centrifugal compressor further comprise the flow parameters and the ambient parameters of the working fluid in the inlet guide vane fit (7) between the inlet guide vane assembly (2) and the inner wall of the inlet channel (1). [18] Testing device according to claim 17, characterized by, that the analysis of the total external performance and the internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor includes: analyzing the internal fluid flow characteristics of the inlet guide grid clearance (7) and their effects on the total performance of the centrifugal compressor and the internal flow field based on the recorded flow parameters and ambient parameters of the working fluid in the inlet guide grid clearance (7). [19] Testing device according to any one of claims 9 to 18, characterized by, that the diffuser assembly (4) comprises a diffuser cavity and a diffuser blade (41) rotatably arranged in the diffuser cavity, wherein the diffuser blade (41) has a diffuser channel, and wherein a diffuser clearance (10) is provided between the diffuser blade (41) and the inner wall of the diffuser cavity; and wherein the flow parameters of the centrifugal compressor further comprise the flow parameters and the ambient parameters of the working fluid in the diffuser clearance (10) between the diffuser blade (41) and the inner wall of the diffuser cavity. [20] Testing device according to claim 19, characterized by, that the analysis of the total external performance and the internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor includes the following: analyzing the internal fluid flow characteristics of the diffuser clearance (10) and their effects on the total performance of the centrifugal compressor and the internal flow field based on the recorded flow parameters and environmental parameters of the working fluid in the diffuser clearance (10). [21] Testing device according to claim 8 or 9, characterized by , that the external characteristic parameters of the working fluid include at least one of the following parameters: pressure ratio, temperature ratio, torque, shaft power, mechanical efficiency, isothermal efficiency, isentropic efficiency, adiabatic efficiency, stability margin, surge margin, specific work and leakage rate of the working fluid. [22] Testing device according to claim 8 or 9, characterized by that the flow parameters of the working fluid include at least one of the following parameters: pressure, temperature, velocity, flow rate, vibration displacement, phase concentration, viscosity, Reynolds number and surface tension of the working fluid. [23] Testing device according to claim 8 or 9, characterized by that the environmental parameters of the working fluid include at least one of the following parameters: sound pressure decibels, humidity, surface roughness and wear of the environment in which the working fluid is located. [24] Test device according to any one of claims 8 to 23, characterized by , that the test device includes the following: a control module that can be used to adjust the operating parameters of the centrifugal compressor, a detection module usable for detecting the flow parameters of the centrifugal compressor, wherein the flow parameters of the centrifugal compressor comprise the external characteristic parameters of the working fluid at the inlet and outlet of the entire machine of the centrifugal compressor and the flow parameters and environmental parameters of the working fluid at the inlet and outlet of each subassembly inside the centrifugal compressor and the clearance between each subassembly; and an analysis module that can be used to analyze the external overall performance and the internal fluid flow characteristics of the centrifugal compressor based on the recorded flow parameters of the centrifugal compressor. [25] Readable storage medium, characterized by, that computer commands are stored in the readable storage medium, wherein, when the computer commands are executed, a flow test procedure of a test device according to one of claims 8 to 24 is performed.

Images