CN108775850B - Planar blade cascade test device capable of continuously changing blade top gap and test method thereof - Google Patents
Planar blade cascade test device capable of continuously changing blade top gap and test method thereof Download PDFInfo
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- 238000007789 sealing Methods 0.000 claims description 16
- 238000013459 approach Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 abstract description 25
- 230000001052 transient effect Effects 0.000 abstract description 9
- 238000011160 research Methods 0.000 description 22
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
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Abstract
The invention discloses a planar blade grid test device capable of continuously changing blade top gaps and a test method. The method comprises the following steps: step S1: setting the distance between the top of the cascade test piece and the test surface as h0; step S2: setting a motion stroke +S of the motion end of the linear motor when the motion end of the linear motor moves towards the test surface, and setting a motion stroke-S of the motion end of the linear motor when the motion end of the linear motor moves away from the test surface; step S3: the height h=h0+s of the cascade test piece when the linear motor moves close to the test surface, and the height h=h0-S of the cascade test piece when the linear motor moves away from the test surface. The continuous adjustment in the range of the clearance between the leaf tops required to be studied is effectively realized; the method can be used for researching the transient aerodynamic characteristics of the variation process of the tip clearance; when the test of the leaf tip clearance scheme is studied, the test piece does not need to be replaced, and the test time can be obviously shortened.
Description
Technical Field
The invention relates to the technical field of cascade test devices, in particular to a planar cascade test device capable of continuously changing a clearance between blade tops and a test method thereof.
Background
The tip clearance is the distance between the top of the compressor or turbine cascade to the casing, which is one of the important influencing parameters of the aerodynamic performance of the compressor and turbine cascade. The tip clearance can cause tip air leakage, which can have a serious impact on impeller performance, such as: (1) the leakage of the blade tip enables part of fluid to directly flow out of the blade tail edge from the blade front edge through intermittence, does not flow through the impeller channel to expand and do work, and reduces the functional force of the impeller; (2) the leakage flow of the blade tip enters the main flow channel to interact with the main flow and blend, induce various flow vortex interactions, change the flow field structure, increase the flow loss and reduce the turbine efficiency.
Tip clearance flow and its interaction with the main flow is a complex flow process consisting essentially of: (1) the pressure difference between the leaf basin and the leaf back forces the fluid to leak from the leaf basin side to the leaf back side through the gap between the leaf top to form leakage vortex system and change the load distribution of the leaf; (2) the influence of the boundary layer of the blade tip and the blade root on the gap flow; (3) the effect of relative movement between the vane and the casing on leakage flow; (4) the tip clearance size affects the greater the clearance, the stronger the leakage flow. In order to explore and understand the flow characteristics of the tip leakage flow and its impact on impeller performance, it is often necessary to study the cascade aerodynamic performance of different tip clearance schemes. In the aspects of researching the influence rule and physical mechanism of the clearance of the blade tip on the aerodynamic performance of the blade cascade, the blade cascade test piece considering the clearance of the blade tip is generally shown in fig. 3 from the binary plane blade cascade with relatively simple flow.
The planar blade cascade test is a basic test research project in the field of impeller mechanical pneumatic design research, and is the most economical, quick and effective technical approach for verifying and checking the pneumatic performance of the blade profile in the pneumatic design of the compressor and the turbine. In basic research on the performance of compressor and turbine blades, a great number of planar blade cascade tests are performed in addition to continuous theoretical research on blade design, performance improvement and the like, and the theoretical research is verified. Through a plane blade cascade test, the performance of the blade cascade can be deeply known, the pneumatic performance of the blade profile under different schemes is known, and accumulated data is designed and manufactured for a new blade profile, so that the method has great significance in improving the overall performance of the compressor and the turbine. The plane blade cascade test equipment mainly comprises an air inlet section, a stabilizing section, a spray pipe, a plane blade cascade test piece, an exhaust section and the like.
Method for changing blade tip clearance by traditional plane blade grid test
In the process of plane blade cascade test research for researching the influence of different blade top clearance schemes on blade cascade performance, the traditional test method is to process plane blade cascade test pieces with different heights. The cascade test pieces with different heights h are processed before the test, and the planar cascade test study of different blade top clearance delta schemes is carried out by replacing the cascade test pieces with different heights h during the test.
Introduction of linear motor:
a linear motor is a transmission device that converts electrical energy directly into linear motion mechanical energy without any intermediate conversion mechanism. The linear motor can be flat plate type, U-shaped groove type, cylindrical and tubular, and the structure is most suitable for the specification requirement and working environment of practical application.
The fixed end of the linear motor is called a primary, and the linear motion member is called a secondary. In practice, the primary and secondary are manufactured in different lengths and shapes to ensure that the coupling between the primary and secondary remains unchanged over the required range of travel.
The traditional method for changing the clearance of the blade tip by adopting the planar blade cascade test is realized by processing planar blade cascade test pieces with different heights, so that one blade tip clearance scheme needs to process one set of planar blade cascade test pieces. The cascade test pieces with different heights h are determined before the test, so that the plane cascade test study of different blade tip clearance delta schemes is carried out. When different blade top clearance scheme test researches are carried out, a plurality of sets of plane blade grid test pieces are required to be processed, so that the research work of the blade top clearance parameters is stepped in a selected range, namely, the test researches cannot obtain the continuous change rule of the blade top clearance parameters to the plane blade grid aerodynamic performance in the research range, and the transient change process of the plane blade grid aerodynamic performance in the blade top clearance change process cannot be researched.
Disclosure of Invention
The invention aims to provide a planar cascade test device capable of continuously changing a cascade clearance and a test method thereof, which can effectively solve the problems that when different cascade clearance schemes are developed in the current planar cascade test research, the cost is high due to the fact that the number of processing pieces of cascade test pieces is large, the continuous change rule of the cascade clearance parameters on the aerodynamic performance of the planar cascade cannot be obtained, and the transient change process research of the aerodynamic performance of the planar cascade in the cascade clearance change process cannot be developed.
The invention is realized by the following technical scheme:
the utility model provides a but plane cascade test device in continuous variable blade top clearance, includes a plurality of cascade test pieces of mutual parallel arrangement, is used for installing the mounting bracket of a plurality of cascade test pieces, the mounting bracket is including being provided with the test surface, be provided with the cavity that is used for installing a plurality of cascade test pieces in the mounting bracket, still include be connected and be used for driving a plurality of cascade test pieces and be close to/keep away from the drive arrangement of test surface.
Working principle: when the device is used, an operator controls the driving device connected with the cascade test piece to move towards the direction close to/away from the test surface, and the distance between one side of the cascade test piece close to the test surface and the test surface is fixed before the driving device works, so that the height of the cascade test piece in the cavity is changed by controlling the stroke of the driving device towards the direction close to/away from the test surface; the continuous change rule of the blade top clearance parameter to the plane blade grid aerodynamic performance can be effectively obtained through the change of the height, and meanwhile, the research of the transient change process of the plane blade grid aerodynamic performance in the blade top clearance change process by researchers is facilitated; compared with the prior art, the invention can complete the test by only one set of blade grid test pieces, and can effectively reduce the cost.
Further, in order to better realize the invention, the mounting frame comprises an upper wall plate provided with a test surface, a lower wall plate which is parallel to the upper wall plate and two bolts which are arranged between the upper wall plate and the lower wall plate, wherein the two bolts, the upper wall plate and the lower wall plate form a cavity for mounting a plurality of blade grid test pieces; the lower wall plate is connected with a driving device.
Further, in order to better realize the invention, one end of the blade grid test piece, which is close to the lower wall plate, is provided with a movement guide rod, and the lower wall plate is provided with a second dynamic sealing guide groove; the motion guide rod passes through the second dynamic sealing guide groove and is connected with the driving device.
Further, in order to better realize the invention, the driving device comprises a moving plate connected with one end of the moving guide rod far away from the blade grid test piece and arranged in parallel with the lower wall plate, and a linear motor arranged between the moving plate and the lower wall plate; the motion end of the linear motor is connected with the motion plate, and the fixed end of the linear motor is connected with the lower wall plate.
Further, in order to better realize the invention, a first dynamic sealing guide groove used for installing one end of the blade grid test piece, which is close to the lower wall plate, is further formed in one side, close to the upper wall plate, of the lower wall plate, and the first dynamic sealing guide groove is communicated with the second dynamic sealing guide groove; the blade grid test pieces, the first dynamic seal guide grooves and the second dynamic seal guide grooves are the same in number and are arranged in one-to-one correspondence.
Further, in order to better realize the invention, the plurality of mutually parallel blade grid test pieces are arranged at equal intervals.
A test method of a planar cascade test device capable of continuously changing a top clearance of a blade specifically comprises the following steps:
step S1: before the linear motor moves, setting the distance between the top of the blade grid test piece and the test surface of the lower wall plate as h0;
step S2: controlling the motion stroke S of the motion end of the linear motor towards the direction close to/far from the test surface, setting the motion stroke of the motion end of the linear motor when the motion end of the linear motor moves towards the direction close to the test surface as plus S, and setting the motion stroke of the motion end of the linear motor when the motion end of the linear motor moves towards the direction far from the test surface as minus S;
step S3: the height H=h0+S of the cascade test piece when the linear motor moves towards the test surface and the height H=h0-S of the cascade test piece when the linear motor moves away from the test surface are calculated.
Compared with the prior art, the invention has the following advantages:
(1) The invention can effectively realize continuous adjustment in the range of the clearance between the blade tops to be researched;
(2) The invention can be used for researching the transient aerodynamic characteristics of the variation process of the blade tip clearance;
(3) The invention has simple structure, is easy to realize and reduces the processing cost of test pieces in the research process of different blade tip clearances;
(4) When the invention is used for the experimental study of the leaf top clearance scheme, the experimental part does not need to be replaced, and the experimental time can be obviously shortened.
Drawings
FIG. 1 is an elevation view of a test device of the present invention;
FIG. 2 is a schematic diagram of the connection relationship between a linear motor and a lower wall plate in the present invention;
FIG. 3 is a schematic view of a cascade test piece considering tip clearance;
the test piece comprises a 1-blade grid test piece, 21-bolts, 22-lower wall plates, 221-second sealing guide grooves, 222-second sealing guide grooves, 23-upper wall plates, 231-test surfaces, 31-moving ends, 32-fixed ends and 33-moving guide plates.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1:
the invention is realized by the following technical scheme, as shown in fig. 1-2, a planar cascade test device capable of continuously changing a cascade top gap comprises a plurality of cascade test pieces 1 which are arranged in parallel, and a mounting frame for mounting the plurality of cascade test pieces 1, wherein the mounting frame comprises a test surface 231, a cavity for mounting the plurality of cascade test pieces 1 is arranged in the mounting frame, and the device further comprises a driving device which is connected with the plurality of cascade test pieces 1 and is used for driving the plurality of cascade test pieces 1 to approach/depart from the test surface 231.
It should be noted that, by the above improvement, when in use, the operator controls the driving device connected with the cascade test piece 1 to move towards/away from the test surface 231, and because the distance between the side of the cascade test piece 1, which is close to the test surface 231, and the test surface 231 is fixed before the driving device works, the height of the cascade test piece 1 in the cavity is changed by controlling the stroke of the driving device towards/away from the test surface 231; the continuous change rule of the blade top clearance parameter to the plane blade grid aerodynamic performance can be effectively obtained through the change of the height, and meanwhile, the research of the transient change process of the plane blade grid aerodynamic performance in the blade top clearance change process by researchers is facilitated; compared with the prior art, the invention can complete the test by only one set of blade grid test piece 1, thereby effectively reducing the cost.
Other portions of the present embodiment are the same as those of the above embodiment, and thus will not be described again.
Example 2:
this embodiment is further optimized on the basis of the above embodiment, as shown in fig. 1, the mounting frame includes an upper wall plate 23 provided with a test surface 231, a lower wall plate 22 disposed parallel to the upper wall plate 23, and two bolts 21 disposed between the upper wall plate 23 and the lower wall plate 22, and the two bolts 21, the upper wall plate 23, and the lower wall plate 22 form a cavity for mounting a plurality of cascade test pieces 1; the lower wall plate 22 is connected to a drive device.
By the above improvement, the mounting frame includes an upper wall plate 23 provided with a test surface 231, a lower wall plate 22 disposed parallel to the upper wall plate 23, and two bolts 21 disposed between the upper wall plate 23 and the lower wall plate 22, the two bolts 21, the test surface 231, and the lower wall plate 22 forming a cavity for mounting a plurality of blade cascade test pieces 1; the lower wall plate 22 is connected with a driving device; the test surface 231 is arranged on the side of the upper wall plate 23, which is close to the cascade test piece 1.
Other portions of the present embodiment are the same as those of the above embodiment, and thus will not be described again.
Example 3:
further optimizing the embodiment on the basis of the above embodiment, as shown in fig. 2, a motion guide rod is arranged at one end of the blade grid test piece 1, which is close to the lower wall plate 22, and the lower wall plate 22 is provided with a second dynamic seal guide groove 222; the motion guide rod passes through the second dynamic seal guide slot 222 to be connected with a driving device.
By the improvement, the number of the movement guide rods, the second sealing guide grooves and the blade grid test pieces 1 is the same and the blade grid test pieces are arranged in a one-to-one correspondence manner. When the blade grid test pieces 1 are used, the blade grid test pieces 1 are respectively connected with a driving device through a motion guide rod connected with one side of the blade grid test pieces close to the lower wall plate 22 so as to change the gap between one side of the blade grid test pieces 1 close to the upper wall plate 23 and the upper wall plate 23; the second dynamic seal guide 222 effectively limits the movement direction of the movement guide rod.
Other portions of the present embodiment are the same as those of the above embodiment, and thus will not be described again.
Example 4:
the embodiment is further optimized based on the above embodiment, as shown in fig. 1, the driving device includes a moving plate 33 connected with one end of the moving guide rod far away from the blade grid test piece 1 and arranged parallel to the lower wall plate 22, and a linear motor arranged between the moving plate 33 and the lower wall plate 22; the moving end 31 of the linear motor is connected with the moving plate 33, and the fixed end 32 of the linear motor is connected with the lower wall plate 22.
One end of the remote guide rod, which is far away from the blade grid test piece 1, is fixedly connected with the moving plate 33, the moving end 31 of the linear motor is in threaded connection with the moving plate 33, and the fixed end 32 of the linear motor is fixedly connected with the lower wall plate 22 through a connecting bolt.
The side, close to the upper wall plate 23, of the lower wall plate 22 is also provided with a first dynamic seal guide groove 221 for installing one end, close to the lower wall plate 22, of the cascade test piece 1, and the first dynamic seal guide groove 221 is communicated with a second dynamic seal guide groove 222; the blade grid test pieces 1, the first dynamic seal guide grooves 221 and the second dynamic seal guide grooves 222 are the same in number and are arranged in one-to-one correspondence.
The first dynamic seal groove 221 is provided so that the height of the cascade test piece 1 in the cavity is more clearly indicated.
The plurality of parallel cascade test pieces 1 are arranged at equal intervals. Equidistant setting avoids interval inequality to cause the influence to later stage research.
Other portions of the present embodiment are the same as those of the above embodiment, and thus will not be described again.
Example 5:
as shown in FIG. 1, the test method of the planar cascade test device capable of continuously changing the clearance of the blade tip specifically comprises the following steps:
step S1: before the linear motor moves, setting the distance between the top of the cascade test piece 1 and the test surface 231 of the lower wall plate 22 as h0;
step S2: controlling the movement stroke S of the linear motor movement end 31 to approach to/separate from the test surface 231, setting the movement stroke of the linear motor movement end 31 to be plus S when moving to approach to the test surface 231, and setting the movement stroke of the linear motor movement end 31 to be minus S when moving to be far from the test surface 231;
step S3: it is calculated that the height h=h0+s of the cascade test piece 1 when the linear motor moves toward the test surface 231 and the height h=h0-S of the cascade test piece 1 when the linear motor moves away from the test surface 231.
By the improvement, when the plane blade cascade test research of different blade top clearance schemes is carried out at present, the method is generally adopted to process plane blade cascade test pieces 1 with different blade heights, one blade top clearance scheme needs to process one set of plane blade cascade test pieces 1, and the studied blade top clearance cannot be continuously adjusted in the test process. However, in the experimental research process of the influence of the clearance parameters of the blade tip on the aerodynamic performance of the blade cascade, the blade cascade is always required to be continuously regulated according to the planar blade cascade test result, so that the problems of complex test piece replacement, long test period and abnormally high test piece processing cost when different blade tip clearance scheme researches are developed are caused; meanwhile, the continuous change rule of the blade top clearance parameter to the aerodynamic performance of the planar blade cascade in the research range cannot be obtained in the prior art, and the transient change process of the aerodynamic performance of the planar blade cascade in the blade top clearance change process cannot be researched.
Compared with the prior art, the linear motor is adopted in the design, so that the continuous change rule of the clearance parameter of the side, close to the test surface 231, of the blade cascade test piece 1 on the plane blade cascade aerodynamic performance can be facilitated for researchers, and the problem that the transient change process of the plane blade cascade aerodynamic performance in the blade top clearance change process cannot be researched can be solved.
Other portions of the present embodiment are the same as those of the above embodiment, and thus will not be described again.
Example 6:
in the preferred embodiment of the present embodiment, as shown in fig. 1-2, a planar cascade test apparatus capable of continuously changing a top clearance of a blade includes a plurality of cascade test pieces 1 disposed parallel to each other, a mounting frame for mounting the plurality of cascade test pieces 1, the mounting frame includes a test surface 231, a cavity for mounting the plurality of cascade test pieces 1 is disposed in the mounting frame, and a driving device connected with the plurality of cascade test pieces 1 and used for driving the plurality of cascade test pieces 1 to approach/separate from the test surface 231 is further included.
The mounting frame comprises an upper wall plate 23 provided with a test surface 231, a lower wall plate 22 arranged in parallel with the upper wall plate 23 and two bolts 21 arranged between the upper wall plate 23 and the lower wall plate 22, wherein the two bolts 21, the upper wall plate 23 and the lower wall plate 22 form a cavity for mounting a plurality of blade grid test pieces 1; the lower wall plate 22 is connected to a drive device. Two bolts 21 cooperate with nuts to fix the upper wall plate 23 and the lower wall plate 22.
A motion guide rod is arranged at one end, close to the lower wall plate 22, of the blade grid test piece 1, and a second dynamic seal guide groove 222 is arranged on the lower wall plate 22; the motion guide rod passes through the second dynamic seal guide slot 222 to be connected with a driving device.
The depth of the second sealing guide groove along the length direction of the moving guide rod is 3 mm-12 mm.
The driving device comprises a moving plate 33 connected with one end of the moving guide rod far away from the blade grid test piece 1 and arranged in parallel with the lower wall plate 22, and a linear motor arranged between the moving plate 33 and the lower wall plate 22; the moving end 31 of the linear motor is connected with the moving plate 33, and the fixed end 32 of the linear motor is connected with the lower wall plate 22.
The side, close to the upper wall plate 23, of the lower wall plate 22 is also provided with a first dynamic seal guide groove 221 for installing one end, close to the lower wall plate 22, of the cascade test piece 1, and the first dynamic seal guide groove 221 is communicated with a second dynamic seal guide groove 222; the blade grid test pieces 1, the first dynamic seal guide grooves 221 and the second dynamic seal guide grooves 222 are the same in number and are arranged in one-to-one correspondence.
The depth of the first dynamic seal guide groove 221 along the long direction of the moving guide rod is 2 mm-15 mm. The diameter of the motion guide rod is 2-10 mm. The thickness of the lower wall plate 22 along the length direction of the motion guide rod is the sum of the depth of the first sealing guide groove and the depth of the second sealing guide groove.
The plurality of parallel cascade test pieces 1 are arranged at equal intervals.
The linear motor is provided with a linear encoder with control precision of +/-1 mu m, the linear motor and the linear encoder are in the prior art, and do not belong to the improvement points of the invention, and the internal structure of the linear encoder is not repeated;
by the improvement, the invention can effectively solve the problems that the cost is high, the continuous change rule of the blade top clearance parameter to the aerodynamic performance of the planar blade cascade cannot be obtained and the transient change process research of the aerodynamic performance of the planar blade cascade in the blade top clearance change process cannot be carried out due to the large number of processing pieces of the blade cascade test piece 1 when different blade top clearance schemes are carried out in the current planar blade cascade test research.
Other portions of the present embodiment are the same as those of the above embodiment, and thus will not be described again.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (4)
1. The utility model provides a but plane cascade test device in continuous variable blade top clearance, includes a plurality of cascade test pieces (1) that are parallel to each other, is used for installing the mounting bracket of a plurality of cascade test pieces (1), the mounting bracket is including being provided with test surface (231), be provided with the cavity that is used for installing a plurality of cascade test pieces (1) in the mounting bracket, its characterized in that: the device also comprises a driving device which is connected with the plurality of blade grid test pieces (1) and is used for driving the plurality of blade grid test pieces (1) to approach to/depart from the test surface (231);
the mounting frame comprises an upper wall plate (23) provided with a test surface (231), a lower wall plate (22) which is parallel to the upper wall plate (23) and two bolts (21) which are arranged between the upper wall plate (23) and the lower wall plate (22), wherein the two bolts (21), the upper wall plate (23) and the lower wall plate (22) form a cavity for mounting a plurality of blade grid test pieces (1); the lower wall plate (22) is connected with a driving device; a motion guide rod is arranged at one end, close to the lower wall plate (22), of the blade grid test piece (1), and a second dynamic sealing guide groove (222) is formed in the lower wall plate (22); the motion guide rod passes through the second dynamic sealing guide groove (222) to be connected with the driving device;
the driving device comprises a moving plate (33) connected with one end of the moving guide rod far away from the blade grid test piece (1) and arranged in parallel with the lower wall plate (22), and a linear motor arranged between the moving plate (33) and the lower wall plate (22); the motion end (31) of the linear motor is connected with the motion plate (33), and the fixed end (32) of the linear motor is connected with the lower wall plate (22);
when the device is used, an operator controls a driving device connected with the cascade test piece (1) to move towards/away from the test surface (231), and the height of the cascade test piece (1) in the cavity is changed by controlling the stroke of the driving device towards/away from the test surface (231) because the distance between one side of the cascade test piece (1) close to the test surface (231) and the test surface (231) is fixed before the driving device works; the continuous change rule of the blade top clearance parameter to the plane blade grid aerodynamic performance can be effectively obtained through the change of the height.
2. A planar cascade test apparatus for continuously variable tip clearance as recited in claim 1 wherein: one side of the lower wall plate (22) close to the upper wall plate (23) is also provided with a first dynamic sealing guide groove used for installing one end of the blade grid test piece (1) close to the lower wall plate (22), and the first dynamic sealing guide groove is communicated with a second dynamic sealing guide groove (222); the blade grid test pieces (1), the first dynamic seal guide grooves and the second dynamic seal guide grooves (222) are the same in number and are arranged in one-to-one correspondence.
3. A planar cascade test apparatus for continuously variable tip clearance according to claim 1 or 2, characterized in that: the plurality of parallel blade grid test pieces (1) are arranged at equal intervals.
4. A method of testing a planar cascade test apparatus for continuously variable tip clearance as claimed in claim 3 wherein: the method specifically comprises the following steps:
step S1: before the linear motor moves, setting the distance between the top of the blade grid test piece (1) and the test surface (231) of the lower wall plate (22) as h0;
step S2: controlling the movement stroke S of the movement end (31) of the linear motor to approach to/separate from the test surface (231), setting the movement stroke of the movement end (31) of the linear motor to be plus S when the movement end (31) of the linear motor moves to approach to the test surface (231), and setting the movement stroke of the movement end (31) of the linear motor to be minus S when the movement end (31) of the linear motor moves to be far from the test surface (231);
step S3: the height H=h0+S of the cascade test piece (1) when the linear motor moves close to the test surface (231) and the height H=h0-S of the cascade test piece (1) when the linear motor moves away from the test surface (231) are calculated.
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| CN112881026B (en) * | 2019-11-13 | 2022-11-15 | 中国航发商用航空发动机有限责任公司 | Back-thrust blade cascade for blade density adjustable test |
| CN111579197B (en) * | 2020-03-25 | 2022-03-25 | 西北工业大学 | Gap-variable plane blade cascade gap adjustment experimental device and method |
| CN112729751B (en) * | 2020-12-30 | 2023-10-27 | 哈尔滨工业大学 | Test bed |
| CN113029574B (en) * | 2021-03-23 | 2022-06-24 | 中国空气动力研究与发展中心空天技术研究所 | Length-adjustable planar cascade test section wallboard |
| CN113418716B (en) * | 2021-06-05 | 2024-05-31 | 西北工业大学 | Blade cascade experimental device with adjustable blade top gap |
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