An auxiliary power unit turbine vane flow testing device, system, and method

Abstract

This invention relates to the field of auxiliary power unit testing technology, and discloses an auxiliary power unit turbine guide vane flow testing device, system, and method. The auxiliary power unit turbine guide vane flow testing device includes: a fixed disk with a through groove extending along its axial direction, the through groove for placing a standard part and a test part, or a test part and a test part; a slider disposed in the through groove and slidable along the extension direction of the through groove; a clamping mechanism disposed on the fixed disk and the slider, used to clamp the standard part and the test part into the through groove, or to clamp the test part and the test part into the through groove. The auxiliary power unit turbine guide vane flow testing system includes the auxiliary power unit turbine guide vane flow testing device, an air source unit, a measurement unit, and a calculation unit. The auxiliary power unit turbine guide vane flow testing method includes two steps. This invention, through the above technical solution, solves the technical problems of low efficiency in detecting turbine guide vanes and the inability to accurately measure individual guide vane channels.

Description

Technical Field

[0001] This invention relates to the field of auxiliary power unit testing technology, and in particular to an auxiliary power unit turbine guide vane flow testing device, system and method. Background Technology

[0002] The Auxiliary Power Unit (APU) is a small gas turbine engine that is an important component of an aircraft. It is a small power unit installed inside the tail cone at the rear of the aircraft fuselage. When the aircraft is waiting to take off, it provides power and gas to the electrical and environmental control systems in the cabin. During flight, it provides backup power and helps the aircraft start its engines.

[0003] Turbine guide vanes are critical stator components in an APU, and their effective flow area is a key aerodynamic parameter affecting turbine efficiency, APU output power, and surge margin. During APU overhaul or manufacturing, the effective flow area of ​​the turbine guide vanes may deviate from the design value due to thermal load, mechanical stress, and machining errors, necessitating accurate inspection.

[0004] Currently, existing technologies for APU turbine guide vanes have low efficiency in detecting the effective flow area, making it impossible to accurately measure the channel of a single guide vane. Summary of the Invention

[0005] This application discloses an auxiliary power unit turbine guide vane flow testing device, system, and method to solve the technical problems of low efficiency in detecting turbine guide vanes and inability to accurately measure the channel of a single guide vane in related technologies.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] In a first aspect, this application discloses an auxiliary power unit turbine guide vane flow testing device, comprising:

[0008] A fixed plate having a through slot running through it along its axial direction, the through slot being used to place standard parts and test pieces, or to place test pieces and test pieces;

[0009] A slider is provided in the through groove and can slide along the extension direction of the through groove to change the length of the through groove;

[0010] A clamping mechanism, located on a fixed plate and a slider, is used to clamp standard parts and test pieces into the through groove, or to clamp test pieces and test pieces into the through groove.

[0011] In some designs, the clamping mechanism includes an elastic component and a drive component. The drive component is located on the fixed plate and the slider and is connected to the elastic component to drive the elastic component to move closer to or away from the through slot.

[0012] In some embodiments, the drive assembly includes two first drive units and two second drive units. The two first drive units are disposed on a fixed disk and arranged radially on both sides of the through groove. The two second drive units are arranged axially on both sides of the through groove, with one second drive unit disposed on a slider and the other second drive unit disposed on the fixed disk.

[0013] The elastic component is connected to two first driving parts and two second driving parts, which are used to drive the elastic component to move closer to or away from the through slot.

[0014] In some embodiments, the elastic component includes four elastic pieces, two of which are disposed circumferentially along the through groove on both sides of one of the first driving parts, and the other two elastic pieces are disposed circumferentially along the through groove on both sides of the other first driving part.

[0015] In some embodiments, the first drive unit includes a first base, a first connecting rod, a first handle, and a first clamping rod. The first base is disposed on a fixed plate, the first clamping rod is rotatably disposed on the first base, and the first handle is rotatably disposed on the first base and connected to the first clamping rod through the first connecting rod.

[0016] Two elastic plates are arranged on both sides of the first clamping rod along the circumference of the through groove.

[0017] In some embodiments, the second drive unit includes a second base, a second connecting rod, a second handle, a second clamping rod, and a clamping plate. The second clamping rod is rotatably mounted on the second base, and the second handle is rotatably mounted on the second base and connected to the second clamping rod via the second connecting rod. The clamping plate is mounted on the second clamping rod and is arranged radially along the through groove corresponding to two elastic plates.

[0018] One of the second bases is located on the fixed plate, and the other second base is located on the slider.

[0019] In some designs, the fixed plate is provided with a first baffle for holding the test specimen against the through slot;

[0020] And / or, the slider has a second baffle for abutting against the standard or test piece;

[0021] And / or, the elastic sheet has a bending structure;

[0022] And / or, the fixed plate has one of a guide groove and a protrusion corresponding to the through groove, and the slider has the other, with the protrusion embedded in the guide groove.

[0023] Secondly, this application also discloses an auxiliary power unit turbine guide vane flow testing system, including the auxiliary power unit turbine guide vane flow testing device of the first aspect, and further comprising:

[0024] Air source unit, used to generate airflow;

[0025] The measuring unit is used to measure the flow area of ​​standard parts and test parts, as well as the flow area of ​​test parts and test pieces.

[0026] The calculation unit is used to calculate the flow area of ​​the test specimen and the flow area of ​​the test specimen.

[0027] Thirdly, this application also discloses a method for testing the flow rate of turbine guide vanes in an auxiliary power unit, which uses the auxiliary power unit turbine guide vane flow rate testing system described in the second aspect, and further includes the following steps:

[0028] Measure the total flow area of ​​the standard parts and the test parts, and calculate the flow area of ​​the test parts based on the flow area of ​​the standard parts;

[0029] Measure the total flow area of ​​the test specimen and the sample specimen, and calculate the flow area of ​​the sample specimen based on the flow area of ​​the test specimen.

[0030] In some schemes, the flow area of ​​the test specimen is calculated as follows:

[0031] A 陪 =A 总1- A 标

[0032] The flow area of ​​the test piece is calculated as follows:

[0033] A 测 =A 总2 -A 陪

[0034] In the above formula, A 总1 A represents the total flow area of ​​standard parts and test parts. 总2 A represents the total flow area of ​​the test specimen and the sample specimen. 标 For the flow area of ​​standard parts, A 陪 For the flow area of ​​the test specimen, A 测 This refers to the flow area of ​​the test piece.

[0035] The technical solution adopted in this invention can achieve the following beneficial effects:

[0036] The auxiliary power unit turbine guide vane flow testing device of this application has an axially penetrating groove on the fixed plate for placing standard parts and test parts, or test parts and test parts. A slider can slide along the extension direction of the groove to change the groove length, facilitating workpiece loading, unloading, and positioning. A clamping mechanism presses the workpiece assembly into the groove to form a stable seal. This structure, through slider adjustment and clamping mechanism cooperation, achieves rapid clamping and reliable sealing of different workpiece combinations, avoiding the problem of designing complex tooling for a single channel. Simultaneously, the test part can be used multiple times after a single clamping, ensuring measurement repeatability. The flow area of ​​the test part is measured using a differential method: first, the total flow area of ​​the standard part and test part is measured, and the known area of ​​the standard part is subtracted to obtain the area of ​​the test part; then, the total flow area of ​​the test part and test part is measured, and the area of ​​the test part is subtracted to obtain the effective flow area of ​​the test part. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is an isometric view of the auxiliary power unit turbine guide vane flow testing device disclosed in some embodiments of this application;

[0039] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0040] Figure 3 This application discloses, in some embodiments, an isometric view of the hidden fixed disk of the auxiliary power unit turbine guide vane flow testing device. Figure 1 ;

[0041] Figure 4 This application discloses, in some embodiments, an isometric view of the hidden fixed disk of the auxiliary power unit turbine guide vane flow testing device. Figure 2 ;

[0042] Figure 5 This is an isometric view of the first drive unit disclosed in some embodiments of this application;

[0043] Figure 6 This is an isometric view of the second drive unit disclosed in some embodiments of this application;

[0044] Figure 7 This is a flowchart of a method for testing the flow rate of an auxiliary power unit turbine guide vane, as disclosed in some embodiments of this application.

[0045] In the picture:

[0046] 100-Fixed plate, 110-Through groove, 120-Guide groove, 130-First baffle;

[0047] 200 - slider, 210 - protrusion, 220 - second baffle;

[0048] 300-Clamping mechanism, 310-First drive unit, 311-First base, 312-First handle, 313-First clamping rod, 314-First connecting rod, 320-Second drive unit, 321-Second base, 322-Second handle, 323-Second clamping rod, 324-Second connecting rod, 325-Clamping plate, 330-Elastic component, 331-Elastic plate, 3311-Bending structure. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0050] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0051] During the process of testing the flow rate of turbine guide vanes in auxiliary power units, the inventors discovered that existing technologies mainly rely on coordinate measuring machines (CMMs) or optical methods to directly measure the entire guide vane ring or channel. This approach is inefficient and struggles to accurately measure individual channels. Specifically, a single guide vane channel is not an independent part with a standard mounting interface, but rather an irregular space enclosed by adjacent vanes. Direct measurement requires designing complex sealing fixtures for each channel to simulate its airflow boundary, which is not only cumbersome to install and adjust, but also results in poor sealing reliability. Any minute leakage or positioning deviation can severely distort the measurement results. Furthermore, CMMs are contact-based point-by-point sampling methods, which are inefficient and can only reflect the geometric contour, failing to characterize the actual airflow characteristics. Optical methods are easily limited by the accessibility of the channel interior and surface reflection conditions, making it difficult to reliably acquire complete flow channel data. Therefore, existing methods generally suffer from drawbacks in practical applications, including complex operation, poor repeatability, and the inability to achieve efficient and accurate detection of individual channels.

[0052] The following is in conjunction with the appendix Figures 1 to 7 This application provides a detailed description of an auxiliary power unit turbine guide vane flow testing device, system, and method through specific embodiments and application scenarios.

[0053] Some embodiments of this application disclose an auxiliary power unit turbine guide vane flow testing device, including a fixed disk 100, a slider 200 and a clamping mechanism 300.

[0054] like Figure 1 and Figure 2 As shown, the fixed plate 100 has a through groove 110 extending along its axial direction. The through groove 110 is used to place standard parts and test pieces, or to place test pieces and test pieces. The through groove 110 on the fixed plate 100 provides a unified installation interface for standard parts, test pieces, and test pieces, allowing different combinations (standard parts + test pieces, test pieces + test pieces) to be quickly positioned at the same location, avoiding the tedious operation of repeatedly designing complex sealing fixtures for a single channel. At the same time, the through structure of the through groove 110 ensures smooth airflow along the axial direction. Combined with the stability of the fixed plate 100 itself, it can significantly improve installation repeatability and testing efficiency, thus laying the foundation for accurate measurement of a single channel.

[0055] Correspondingly, the through groove 110 extends in an arc shape, which can better match the arc contour of the turbine guide vane ring, facilitating the reliable installation and positioning of standard parts, test parts, and test pieces.

[0056] In this embodiment, the standard part is a known part whose precise flow area has been calibrated using a high-precision method, with an error range of less than 0.5%, and is used as a measurement benchmark to calibrate the flow area of ​​the test part.

[0057] In this embodiment, the test piece is a piece with a known flow area used in conjunction with the test piece, and its error range is also less than 0.5%. It acts as an intermediate bridge in the measurement process, first calibrating its area with the standard piece, and then combining it with the measuring piece for measurement.

[0058] In this embodiment, the test piece is a single channel of the turbine guide vane of the auxiliary power unit to be measured, which is the target part whose effective flow area needs to be obtained in the end.

[0059] like Figure 1 As shown, the slider 200 is disposed in the through groove 110 and can slide along the extension direction of the through groove 110 to change the length of the through groove 110. By moving the slider 200 along the extension direction of the through groove 110, the usable length of the through groove 110 can be dynamically adjusted: when installing or removing standard parts or test pieces, the slider 200 moves backward to increase the length of the through groove 110, providing sufficient operating space for the insertion or removal of standard parts or test pieces and avoiding interference between the standard parts or test pieces and the fixed plate 100; after the standard parts or test pieces are in place, the slider 200 moves forward to adjust the length of the through groove 110 to match the actual size, ensuring that the standard parts or test pieces are stably positioned and form a reliable sealing boundary. This structure simplifies the loading and unloading operations of standard parts and test pieces, allowing for quick replacement without disassembling complex tooling, effectively improving testing efficiency and operational convenience.

[0060] like Figure 1 As shown, the clamping mechanism 300 is disposed on the fixed plate 100 and the slider 200, and is used to clamp the standard part and the test piece into the through groove 110, or to clamp the test piece and the test piece into the through groove 110. The clamping mechanism 300, disposed on the fixed plate 100 and the slider 200, clamps the standard part and the test piece into the through groove 110, or clamps the test piece and the test piece into the through groove 110, so that the workpiece assembly forms a stable and sealed installation state in the through groove 110, avoiding air leakage due to looseness or gaps that could affect measurement accuracy. This mechanism, in conjunction with the adjustable length through groove 110 and slider 200, eliminates the need to repeatedly design special clamping fixtures for different workpiece combinations; rapid clamping and reliable sealing can be achieved through a single clamping action, significantly improving operational efficiency while ensuring test accuracy.

[0061] First, the standard part and the test piece are installed and tightened in the through groove 110. The total flow area of ​​the two is measured, and the known precise flow area of ​​the standard part is subtracted to calculate the flow area of ​​the test piece. Then, the test piece and the test piece are installed and tightened in the through groove 110, and the total flow area of ​​the two is measured. The calibrated flow area of ​​the test piece is subtracted to obtain the effective flow area of ​​the test piece (a single guide vane channel). Throughout the measurement process, the low-pressure air source system provides a stable airflow, the pressure sensor measures the pressure difference in real time, the data acquisition module records the flow rate and pressure difference data, and the calculation and analysis software calculates the effective flow area of ​​the test piece based on the aerodynamic model.

[0062] like Figure 1 , Figure 3 and Figure 4 As shown, the clamping mechanism 300 includes an elastic component 330 and a driving component. The driving component is disposed on the fixed plate 100 and the slider 200 and connected to the elastic component 330, used to drive the elastic component 330 to move closer to or away from the through groove 110. When the elastic component 330 approaches the through groove 110, it generates a uniform and controllable clamping force through its elastic deformation, stably pressing the standard part and the test part or the test part and the test part into the through groove 110 to form a reliable seal. When the elastic component 330 moves away from the through groove 110, the clamping state is released, facilitating the loading and unloading of the workpiece. This structure utilizes the self-adaptive capability of the elastic component 330 to compensate for differences in workpiece size and installation gaps, avoiding overload or uneven sealing problems caused by rigid clamping. At the same time, the driving component enables rapid switching between clamping and releasing, further improving operational efficiency while ensuring sealing reliability.

[0063] like Figure 1 , Figure 3 and Figure 4As shown, the drive assembly includes two first drive units 310 and two second drive units 320. The two first drive units 310 are disposed on the fixed disk 100 and arranged radially on both sides of the through groove 110. The two second drive units 320 are arranged axially on both sides of the through groove 110, one of which is disposed on the slider 200 and the other is disposed on the fixed disk 100. The elastic component 330 is connected to the two first drive units 310 and the two second drive units 320. The first drive units 310 and the second drive units 320 are used to drive the elastic component 330 to move closer to or away from the through groove 110. The drive assembly connects to the elastic component 330 from both radial and axial directions via two first drive units 310 arranged radially along both sides of the fixed disk 100 and two second drive units 320 arranged axially along both sides of the through groove 110, thereby moving the elastic component closer to or away from the through groove 110. The two second drive units 320 are respectively positioned on the slider 200 and the fixed disk 100, ensuring that the elastic component 330 is subjected to clamping force at both axial ends. This arrangement allows for simultaneous application of force from the four corners or ends of the elastic component 330, effectively preventing localized upward or warping deformation due to uneven force during clamping. This ensures a uniform and stable clamping contact between the elastic component 330 and the workpiece, thereby improving the reliability of the seal and the consistency of test results.

[0064] like Figure 3 and Figure 4 As shown, the elastic component 330 includes four elastic pieces 331. Two elastic pieces 331 are arranged circumferentially along the through groove 110 on both sides of one of the first driving parts 310, and the other two elastic pieces 331 are arranged circumferentially along the through groove 110 on both sides of the other first driving part 310. Of the four elastic pieces 331, the two elastic pieces 331 fixed to one side of the test piece are kept in a bottom pressed state under the action of the first driving part 310, and their free ends can be tilted upwards due to elasticity. The other two elastic pieces 331 can be released and tilted upwards under the action of the second driving part 320. When it is necessary to load or unload the standard part or test piece, the slider 200 retracts to increase the length of the through groove 110. At the same time, the tilted elastic pieces 331 and the slider 200 together form an operating channel that facilitates the insertion or removal of the standard part or test piece. After the workpiece is in place, the elastic pieces 331 reset and press down. This structure utilizes the tilting characteristic of the elastic sheet 331 in conjunction with the movement of the slider 200 to achieve rapid loading and unloading of standard or test pieces, while the test pieces remain in a fixed and compressed state, thus avoiding positioning errors and efficiency losses caused by repeated disassembly and assembly of the test pieces.

[0065] like Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the first drive unit 310 includes a first base 311, a first connecting rod 314, a first handle 312, and a first clamping rod 313. The first base 311 is disposed on the fixed plate 100, the first clamping rod 313 is rotatably disposed on the first base 311, and the first handle 312 is rotatably disposed on the first base 311 and connected to the first clamping rod 313 via the first connecting rod 314. Two elastic plates 331 are disposed on both sides of the first clamping rod 313 along the circumference of the through groove 110. In the first drive unit 310, the first handle 312 drives the first clamping rod 313 to rotate relative to the first base 311 via the first connecting rod 314, and the two elastic plates 331 disposed on both sides of the first clamping rod 313 move closer to or further away from the through groove 110 as the first clamping rod 313 rotates. This structure allows for quick clamping and release of the elastic plate 331 by swinging the handle, making operation effortless and with rapid response. At the same time, the two elastic plates 331 are symmetrically arranged on both sides of the first clamping rod 313, which enables the clamping force to be evenly transmitted to the workpiece, avoiding uneven sealing caused by force on one side, thereby further improving the ease of operation while ensuring the reliability of the seal.

[0066] In this embodiment, the two ends of the first connecting rod 314 are rotatably connected to the first handle 312 and the first clamping rod 313, respectively.

[0067] like Figure 1 , Figure 3 , Figure 4 and Figure 6As shown, the second drive unit 320 includes a second base 321, a second connecting rod 324, a second handle 322, a second pressing rod 323, and a pressing plate 325. The second pressing rod 323 is rotatably mounted on the second base 321, and the second handle 322 is rotatably mounted on the second base 321 and connected to the second pressing rod 323 via the second connecting rod 324. The pressing plate 325 is mounted on the second pressing rod 323 and is arranged radially along the through groove 110 corresponding to two elastic plates 331. One of the second bases 321 is mounted on the fixed plate 100, and the other second base 321 is mounted on the slider 200. In the second drive unit 320, the second handle 322 drives the second clamping rod 323 to rotate relative to the second base 321 via the second connecting rod 324. The clamping plate 325, which is disposed on the second clamping rod 323, is arranged radially along the through groove 110 corresponding to two elastic plates 331, and moves closer to or further away from the elastic plates 331 as the second clamping rod 323 rotates. One of the second bases 321 is disposed on the fixed plate 100, and the other second base 321 is disposed on the slider 200, so that the clamping plate 325 can still accurately act on the elastic plate 331 when the slider 200 moves to different positions. This structure can quickly realize the clamping and releasing of the elastic plate 331 by operating the handle, which is convenient to operate; the radial arrangement of the clamping plate 325 can form a stable contact with the elastic plate 331, ensuring effective transmission of clamping force; at the same time, the two second drive units 320 are respectively disposed on the fixed plate 100 and the slider 200, adapting to the change of the slider 200 position, ensuring reliable execution of the clamping action under different working conditions.

[0068] In this embodiment, the two ends of the second connecting rod 324 are rotatably connected to the second handle 322 and the second clamping rod 323, respectively.

[0069] like Figure 1 and Figure 2 As shown, the fixed plate 100 is provided with a first baffle 130 for holding the test specimen in place in the through slot 110. The first baffle 130 is used to hold the test specimen in place, providing a stable axial positioning reference for the test specimen and preventing it from shifting when loading or unloading standard parts or test pieces, thereby ensuring the consistency of the position of the test specimen in multiple measurements and improving test repeatability.

[0070] like Figure 3 As shown, the slider 200 has a second baffle 220 for holding the standard or test piece against it. The second baffle 220 is used to hold the standard or test piece against it, providing an axial positioning reference to ensure accurate and stable positioning during the clamping process, thereby improving measurement repeatability.

[0071] like Figure 3 As shown, the elastic sheet 331 has a bending structure 3311. The bending structure 3311 can increase the elastic deformation capacity of the elastic sheet 331, making it easier for the free end to bend upwards to accommodate the loading and unloading of the workpiece.

[0072] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the fixed disk 100 has one of a guide groove 120 and a protrusion 210 corresponding to the through groove 110, and the slider 200 has the other. The protrusion 210 is embedded in the guide groove 120. The protrusion 210 embedded in the guide groove 120 provides guidance and limit for the sliding of the slider 200, ensuring that the slider 200 moves smoothly and is accurately positioned, thereby ensuring the consistency of the workpiece installation position.

[0073] In some embodiments, the fixed disk 100 is provided with a guide groove 120 corresponding to the through groove 110, and the slider 200 is provided with a protrusion 210.

[0074] In some embodiments, the fixed disk 100 is provided with a protrusion 210 corresponding to the through groove 110, and the slider 200 is provided with a guide groove 120.

[0075] Some embodiments of this application also disclose an auxiliary power unit turbine guide vane flow testing system, including an auxiliary power unit turbine guide vane flow testing device, an air source unit, a measurement unit, and a calculation unit.

[0076] The air source unit generates airflow; the measurement unit measures the flow area of ​​the standard and test specimens, as well as the flow area of ​​the test specimens and the test specimens; the calculation unit calculates the flow area of ​​the test specimens and the test specimens. The measurement unit measures the total flow area of ​​the combination of the standard and test specimens, and the total flow area of ​​the combination of the test specimens and the test specimens, respectively, and transmits the measurement data to the calculation unit. The calculation unit first calculates the flow area of ​​the test specimens based on the known flow area of ​​the standard and the first measurement result, and then calculates the flow area of ​​the test specimens based on this calculation result and the second measurement result. This scheme, through two measurements and differential calculations, transforms a single test specimen, which is difficult to measure directly, into a measurable assembly, avoiding the difficulty of designing complex sealing fixtures for a single channel. Furthermore, the separation of measurement and calculation facilitates automated control, effectively improving the accuracy and repeatability of the test.

[0077] In this embodiment, the air source unit consists of a dual-fan system driven by a variable frequency motor, a multi-layer rectifier damping net, and a rectifier grid. It is used to generate a large flow rate and low pressure airflow, and to form a stable flow field with uniform pressure and low turbulence through the rectifier structure, so as to provide a stable airflow for the measurement process.

[0078] In this embodiment, the measurement unit uses a high-precision flow meter or pressure sensor with an accuracy of not less than 0.1%. Combined with the pressure sensor and data acquisition module, it realizes real-time measurement of parameters such as airflow pressure difference and flow rate.

[0079] In this embodiment, the calculation unit calculates the flow area based on aerodynamic models (such as Bernoulli's equation and continuity equation) and multi-parameter compensation algorithms.

[0080] It should be noted that the aerodynamic model and multi-parameter compensation algorithm are existing technologies and are not improvements in this embodiment. Their specific steps will not be described in detail here.

[0081] Some embodiments of this application also disclose a method for testing the flow rate of turbine guide vanes in an auxiliary power unit, which utilizes an auxiliary power unit turbine guide vane flow rate testing system, such as... Figure 7 As shown, it also includes the following steps:

[0082] Step 100: Measure the total flow area of ​​the standard part and the test piece, and calculate the flow area of ​​the test piece based on the flow area of ​​the standard part;

[0083] Step 200: Measure the total flow area of ​​the test specimen and the sample specimen, and calculate the flow area of ​​the sample specimen based on the flow area of ​​the test specimen.

[0084] In step 100, the standard part and the test piece are placed sequentially in the through groove 110 of the fixed plate 100. The length of the through groove 110 is adjusted by moving the slider 200 to match the actual size of the workpiece. The clamping mechanism 300 is used to press the standard part and the test piece into the through groove 110 to form a stable seal. The air source unit is started to generate a stable airflow. The measuring unit measures the total flow area of ​​the combination of the standard part and the test piece and transmits the measurement data to the calculation unit. The calculation unit calculates the flow area of ​​the test piece by differential calculation based on the pre-calibrated accurate flow area of ​​the standard part.

[0085] In step 200, after completing step 100, the test piece is kept pressed tightly in the through groove 110. The length of the through groove 110 is increased by loosening the clamping mechanism 300 and sliding the slider 200, and the elastic plate 331 is operated to lift it up, so that the standard piece is taken out from the through groove 110. Then, the test piece (single guide vane channel) is placed into the through groove 110 and connected with the test piece. The slider 200 is adjusted again and the clamping mechanism 300 is operated to press the test piece and the test piece tightly in the through groove 110 to form a stable seal. The air source unit is started, and the measurement unit measures the total flow area of ​​the combination of the test piece and the test piece. The calculation unit calculates the effective flow area of ​​the test piece by difference based on the flow area of ​​the test piece obtained in step 100.

[0086] The calculation method for the flow area of ​​the test specimen is as follows:

[0087] A 陪 =A 总1- A 标

[0088] The flow area of ​​the test piece is calculated as follows:

[0089] A 测 =A 总2 -A 陪

[0090] In the above formula, A 总1 A represents the total flow area of ​​standard parts and test parts. 总2 A represents the total flow area of ​​the test specimen and the sample specimen. 标 For the flow area of ​​standard parts, A 陪 For the flow area of ​​the test specimen, A 测 This refers to the flow area of ​​the test piece.

[0091] Step 100 involves a combination measurement of the standard part and the test piece. The flow area of ​​the test piece is calibrated using the standard part with a known precise area, transforming the test piece into a reference part for subsequent measurements. Step 200 involves replacing only the test piece for combined measurement while the test piece remains fixed and compressed. The effective flow area of ​​the test piece is calculated using the differential method, thus bypassing the engineering challenges of direct measurement and complex sealing of a single channel. The test piece can be reused after one calibration, avoiding positioning errors and time consumption caused by repeated disassembly and assembly. Combined with the fixed plate 100, through groove 110, and clamping mechanism 300, the installation position consistency and sealing reliability of each workpiece are ensured during the measurement process, thereby improving testing efficiency while ensuring the accuracy and repeatability of the measurement results.

[0092] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0093] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0094] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A flow rate testing device for turbine guide vanes in an auxiliary power unit, characterized in that, include: A fixed plate having a through slot extending along its axial direction, the through slot being used to place standard parts and test pieces, or to place test pieces and test pieces; A slider is disposed in the through groove and can slide along the extension direction of the through groove to change the length of the through groove; A clamping mechanism, disposed on the fixed plate and the slider, is used to clamp the standard part and the test piece into the through groove, or to clamp the test piece and the test piece into the through groove; The clamping mechanism includes an elastic component and a driving component. The driving component is disposed on the fixed plate and the slider and is connected to the elastic component, and is used to drive the elastic component to move closer to or away from the through groove. The drive assembly includes two first drive units and two second drive units. The two first drive units are disposed on the fixed disk and arranged radially on both sides of the through groove. The two second drive units are arranged axially on both sides of the through groove, one of the second drive units is disposed on the slider, and the other of the second drive units is disposed on the fixed disk. The elastic component is connected to two first driving parts and two second driving parts, and the first driving parts and the second driving parts are used to drive the elastic component to move closer to or away from the through slot; The elastic component includes four elastic pieces, two of which are disposed circumferentially along the through groove on both sides of one of the first driving parts, and the other two elastic pieces are disposed circumferentially along the through groove on both sides of the other first driving part.

2. An auxiliary power unit turbine vane flow test apparatus as described in claim 1, wherein, The first driving unit includes a first base, a first connecting rod, a first handle, and a first pressing rod. The first base is disposed on the fixed plate, the first pressing rod is rotatably disposed on the first base, and the first handle is rotatably disposed on the first base and connected to the first pressing rod through the first connecting rod. The two elastic plates are arranged circumferentially on both sides of the first clamping rod along the through groove.

3. An auxiliary power unit turbine vane flow test apparatus as recited in claim 2, wherein, The second drive unit includes a second base, a second connecting rod, a second handle, a second pressing rod, and a pressing plate. The second pressing rod is rotatably disposed on the second base, and the second handle is rotatably disposed on the second base and connected to the second pressing rod through the second connecting rod. The pressing plate is disposed on the second pressing rod and is arranged radially along the through groove corresponding to two elastic plates. One of the second bases is disposed on the fixed plate, and the other of the second bases is disposed on the slider.

4. An auxiliary power unit turbine vane flow test apparatus as recited in claim 3, wherein, The fixed plate is provided with a first baffle for holding the test piece against the through groove; And / or, the slider has a second baffle for abutting against a standard or test piece; And / or, the elastic sheet has a bending structure; And / or, the fixed plate is provided with one of a guide groove and a protrusion corresponding to the through groove, and the slider is provided with the other, the protrusion being embedded in the guide groove.

5. An auxiliary power unit turbine vane flow test system comprising the auxiliary power unit turbine vane flow test device of any one of claims 1-4, wherein, Also includes: Air source unit, used to generate airflow; The measuring unit is used to measure the flow area of ​​standard parts and test parts, as well as the flow area of ​​test parts and test pieces. The calculation unit is used to calculate the flow area of ​​the test specimen and the flow area of ​​the test specimen.

6. A method of testing the flow of auxiliary power unit turbine vane, using the auxiliary power unit turbine vane flow test system of claim 5, characterized in that, It also includes the following steps: Measure the total flow area of ​​the standard parts and the test parts, and calculate the flow area of ​​the test parts based on the flow area of ​​the standard parts; Measure the total flow area of ​​the test specimen and the sample specimen, and calculate the flow area of ​​the sample specimen based on the flow area of ​​the test specimen.

7. The method for testing the flow rate of a turbine guide vane in an auxiliary power unit according to claim 6, characterized in that, The calculation method for the flow area of ​​the test specimen is as follows: A 陪 =A 总1- A 标 The flow area of ​​the test piece is calculated as follows: A 测 =A 总2 -A 陪 In the above formula, A 总1 A represents the total flow area of ​​standard parts and test parts. 总2 A represents the total flow area of ​​the test specimen and the sample specimen. 标 For the flow area of ​​standard parts, A 陪 For the flow area of ​​the test specimen, A 测 This refers to the flow area of ​​the test piece.

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