CN113029576A - Method for jointly adjusting spray pipe and test section in plane cascade subsonic test device - Google Patents
Method for jointly adjusting spray pipe and test section in plane cascade subsonic test device Download PDFInfo
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- CN113029576A CN113029576A CN202110306080.3A CN202110306080A CN113029576A CN 113029576 A CN113029576 A CN 113029576A CN 202110306080 A CN202110306080 A CN 202110306080A CN 113029576 A CN113029576 A CN 113029576A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a method for jointly adjusting a spray pipe and a test section in a plane cascade subsonic test device. The joint adjusting method realizes the joint adjustment of the outlet height of the spray pipe and the heights of the upper wall plate and the lower wall plate of the test section through a height adjuster in the height-adjustable sound velocity spray pipe and a wall plate angle adjuster of the subsonic velocity test cabin; the length adjustment of the upper wallboard and the lower wallboard of the test section is realized through a wallboard length adjuster of the subsonic test chamber. The joint adjusting method can conveniently and quickly realize the joint adjustment of the outlet height of the subsonic velocity spray pipe and the height and length of the upper and lower wall plates of the test section, meet the requirements of various plane cascade subsonic velocity aerodynamic performance test researches and technical verifications, save the test preparation time and improve the test efficiency.
Description
Technical Field
The invention belongs to the field of basic research test equipment of aero-engines, and particularly relates to a method for jointly adjusting a spray pipe and a test section in a plane cascade subsonic test device.
Background
The aerodynamic profile of the rotor/stator blades determines the aerodynamic performance of the aircraft turbine (including fan/compressor and turbine) and the gas turbine, which are key components for maintaining the thermodynamic cycle and generating thrust. In order to design high-performance aero jet engines and gas turbines, the design method and flow characteristics of the turbine need to be studied on the cascade (two-dimensional blade profile) level. In order to carry out flow test research on the cascade channels under real flight conditions on the ground, ground equipment capable of simulating parameters such as the flow Mach number, the Reynolds number and the like of the cascade channels in actual flight must be built so as to ensure that a large amount of aerodynamic performance test research and technical verification can be carried out under the condition close to the actual working state, so that the flow mechanism, characteristics and rules in the cascade channels can be analyzed and researched, and a new design scheme is verified. For the study of the turbine blade cascade flow with film cooling and internal air cooling, the main flow and the secondary flow of the test equipment are required to have enough temperature difference or temperature ratio regulation capacity and introduction capacity of different media so as to simulate the heat and mass transfer process between two flows of the same or different media and turbine blades.
At present, a plane cascade test device is generally adopted for carrying out blade cascade tests of aero-engine turbines (including fans/compressors and turbines) and gas turbines at home and abroad, wherein the plane cascade subsonic test device is widely used. Because the range of the airflow angle of the inlet of the test cascade is large, the blockage degree of the cascade at the test section is high, and when the compressor is tested, in order to ensure the Mach number uniformity of the incoming flow in front of the cascade, the flow discharge of the upper end wall and the lower end wall of the cascade is adjusted according to different states of the airflow angle of the inlet of the test. When the test of the blade cascade of the turbine with the film cooling is carried out, in order to ensure the accurate control of the flow ratio of the main flow and the secondary flow, the leakage flow of the upper end wall and the lower end wall of the blade cascade are adjusted according to different test states. To realize the accurate control of the leakage flow of the upper and lower end walls of the cascade, the test section is inevitably required to have the function of adjusting the outlet height, and the strict requirement is also provided for the adjustment of the outlet height of the front-section spray pipe of the test section. Present plane subsonic velocity cascade test device because the velocity of sound spray pipe mostly is solid-state spray pipe, does not possess spray pipe export altitude mixture control function, and end wall earial drainage flow control about the cascade under will satisfying different test conditions generally takes to realize at spray pipe exit linkage different height changeover portion and change wallboard different length about the test section, and wallboard regulative mode brings a lot of shortcomings about this kind of spray pipe height and test section: 1. the connection of the transition sections with different heights with the spray pipes can cause sudden change and step difference of the sizes of the outlets of the spray pipes, so that the quality of a flow field of a test section is deteriorated, and the test precision is reduced; 2. when the test state is changed, the transition sections with different heights and the upper and lower wall plates with different lengths of the test section need to be frequently replaced, so that the operation is extremely inconvenient, the labor intensity is high, and the test efficiency is low; 3. the continuous adjustment of the height of the spray pipe and the height of the test section cannot be realized, and the continuous adjustment of the lengths of the upper wall plate and the lower wall plate of the test section cannot be realized, so that part of test conditions cannot be realized.
At present, a method for joint adjustment of a spray pipe and a test section in a plane blade cascade subsonic velocity test device, which is convenient and efficient to operate, is urgently needed to be developed, and the needs of basic research and technical verification of advanced aero-engine turbine and gas turbine blade cascade aerodynamic performance tests are met.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for jointly adjusting a spray pipe and a test section in a plane cascade subsonic test device.
The invention relates to a method for joint debugging a spray pipe and a test section in a plane cascade subsonic velocity test device, which is characterized in that the plane cascade subsonic velocity test device used in the joint debugging method comprises a height-adjustable subsonic velocity spray pipe and a subsonic velocity test chamber which are arranged on an installation platform and are sequentially connected along the airflow direction; a turbine blade cascade test model or a compressor blade cascade test model is installed in the subsonic test chamber, and observation windows are installed in the centers of the left side wall and the right side wall of the subsonic test chamber;
the height-adjustable sonic velocity spray pipe is a square spray pipe and comprises a fixed contraction section and a height-adjustable contraction section which are arranged on a support frame, are symmetrically arranged up and down along the airflow direction and are sequentially connected in a contraction molded surface overlapping mode; two side wall plates symmetrically arranged at the left side and the right side of the supporting frame; the fixed contraction section, the height-adjustable contraction section and the inner surfaces of the two side wall plates form a spray pipe flow channel; the two height adjusters are symmetrically arranged above and below the supporting frame; the fixed end of the height adjuster is fixed on the support frame, and the moving end of the height adjuster is connected with the height-adjustable contraction section through a hinge; two groups of linear guide rails are respectively arranged on the upper side and the lower side of the horizontal center line of the left side wall plate, and the included angle between the linear guide rails and the horizontal direction is 35-55 degrees; the height-adjustable contraction section is provided with slide blocks which are respectively clamped on the corresponding linear guide rails; under the driving of the height adjuster, the moving end of the height adjuster drives the sliding block of the height adjustable contraction section to move along the linear guide rail through the hinge, and the height adjustable contraction section simultaneously slides along the contraction profile of the fixed contraction section to realize the height adjustment of the outlet of the spray pipe;
the subsonic speed test cabin is a square body and comprises a shell, two test section discs which are arranged in the shell in parallel, two wall plate assemblies which are arranged in the shell up and down, and two groups of corresponding angle regulators and pull rods; the two test section discs are parallel to the axis of the subsonic test chamber and are fixed on the left side and the right side of the axis in parallel, the lower ends of the test section discs are installed on the lower surface of the shell, and the front ends of the test section discs are connected with an airflow inlet flange of the shell; the front ends of the two upper and lower wall plate assemblies are connected with the airflow outlet end of the height-adjustable sound velocity spray pipe through a pin shaft, and the rear ends of the two upper and lower wall plate assemblies are provided with length compensation plates; the fixed ends of the two angle adjusters are respectively and symmetrically arranged on the upper surface and the lower surface of the shell, and the moving ends are respectively and symmetrically arranged on the upper wall plate component and the lower wall plate component through pin shafts; one end of each pull rod is fixed on the test section disc, and the other end of each pull rod is fixed on the upper wall plate assembly and the lower wall plate assembly, so that the effect of auxiliary support on the upper wall plate and the lower wall plate of the test section is realized; the moving end of the angle regulator drives the two upper and lower wall plate assemblies to rotate around the pin shaft to realize the height and angle regulation of the upper and lower wall plate assemblies of the test section, and the length regulation of the upper and lower wall plate assemblies of the test section is realized through the length compensation plate;
the wallboard assembly comprises an upper group and a lower group, and each group comprises a rotating plate, a length adjuster, a guide rail, a rotating connecting seat, a translation plate and a tail plate; the rotating plate is a straight plate, the front end of the rotating plate is a fixed end, the fixed end is fixed at an airflow outlet of the sound velocity spray pipe with adjustable height through a pin shaft, the rear end of the rotating plate is a free end, a guide rail is arranged on the upper surface of the rotating plate, a rotary connecting seat is further fixed on the upper surface of the rear section of the rotating plate, and a through hole in the rotary connecting seat is used for installing an angle adjuster to realize angle adjustment of the rotating plate around the pin shaft at the rear end; the horizontal plate is the other straight plate, a sliding block is fixed on the upper surface of the horizontal plate and clamped on the guide rail, a tail plate is installed at the rear end of the horizontal plate, a pull rod connecting seat is installed on the upper surface of the tail plate, and a through hole of the pull rod connecting seat is used for installing a pull rod to realize auxiliary support of the horizontal plate; the fixed end of the length adjuster is arranged on the upper surface of the rotating plate, and the moving end of the length adjuster is connected with the rear end of the translation plate through a pin shaft; the length adjuster drives the sliding block on the translation plate to move along the guide rail, so that the translation plate moves back and forth;
the space between the inner walls of the two test section discs, the two upper wall plate assemblies, the two lower wall plate assemblies and the two upper length compensation plates and the space between the two lower length compensation plates are test sections; the space between the outer walls of the two test section discs and the shell is a test section parking chamber;
the upper wall plate component and the lower wall plate component are connected with the height-adjustable contraction section through pin shafts; the fixed end of the angle adjuster is fixed on the support frame, and the moving end of the angle adjuster is connected with the rotary connecting seat through a pin shaft, so that the expansion angle adjustment of the upper wall plate assembly and the lower wall plate assembly is realized;
the joint debugging method comprises the following steps:
a. respectively dismantling the pull rods of the upper tail plate and the lower tail plate;
b. respectively starting an upper length regulator and a lower length regulator, and regulating the lengths of the upper wall plate and the lower wall plate of the test section to zero positions;
c. respectively starting the upper angle regulator and the lower angle regulator to expand the upper wall plate and the lower wall plate by 3-5 degrees from zero;
d. according to the test state of the cascade model, calculating H1 of the height of a first blade of the cascade model from the center line of the flow channel and H2 of the height of a tail blade from the center line of the flow channel;
e. simultaneously starting a height adjuster and an angle adjuster above the blade grid model, adjusting the height of a first blade of the blade grid model from the center line of the flow channel to H1, and keeping a 3-5-degree expansion angle of the upper wall plate unchanged in the process;
f. simultaneously starting a height adjuster and an angle adjuster below the height adjuster, adjusting the height of a tail blade of the cascade model from the center line of a flow channel to H2, keeping a 3-5-degree expansion angle of a lower wall plate unchanged in the process, and realizing the combined adjustment of the height of the airflow outlet of the sound velocity spray pipe with adjustable height and the heights of an upper wall plate assembly and a lower wall plate assembly of a test section;
g. respectively starting the upper angle regulator and the lower angle regulator to adjust the expansion angles of the upper wall plate and the lower wall plate to zero positions;
h. starting the upper length regulator to drive the translation plate to move forwards and extend to the front edge of the first blade;
i. and starting the lower length regulator to drive the translation plate to move forwards and extend to the front edge position of the tail blade.
j. The pull rods of the upper tail plate and the lower tail plate are respectively installed.
Further, the pin shaft is replaced by a hinge, and the hinge is replaced by a pin shaft.
Furthermore, the front end of the height-adjustable contraction section is provided with a sealing groove, a rubber strip is arranged in the sealing groove, and the overlapped molded surface between the fixed contraction section and the height-adjustable contraction section is sealed through the rubber strip.
Further, the height adjuster, the angle adjuster and the length adjuster are screw rods or electric cylinders.
Furthermore, the front ends of the upper wall plate component and the lower wall plate component are provided with sealing grooves, and rubber strips are arranged in the sealing grooves.
Further, the guide rail is a linear guide rail.
According to the method for jointly adjusting the spray pipe and the test section in the plane cascade subsonic test device, the joint adjustment of the outlet height of the spray pipe and the heights of the upper wall plate and the lower wall plate of the test section is realized through the height adjuster in the height-adjustable sonic spray pipe and the angle adjuster of the subsonic test cabin; the length adjustment of the upper wall plate and the lower wall plate of the test section is realized through the length adjuster of the subsonic test chamber.
The method for jointly adjusting the nozzle and the test section in the plane cascade subsonic velocity test device is convenient and fast to operate, can conveniently and fast realize the joint adjustment of the outlet height of the subsonic nozzle and the heights of the upper wall plate and the lower wall plate of the test section and the continuous adjustment of the lengths of the upper wall plate and the lower wall plate, meets the requirements of various plane cascade subsonic velocity aerodynamic performance test researches and technical verifications, saves the test preparation time, reduces the labor intensity and improves the test efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a flat cascade subsonic velocity testing device used in a method for joint adjustment of a nozzle and a testing section in the flat cascade subsonic velocity testing device according to the present invention;
FIG. 2 is a schematic structural diagram of a nozzle and a subsonic velocity test chamber with adjustable height in a nozzle and test section joint adjustment method of a plane cascade subsonic velocity test device according to the present invention;
FIG. 3 is a schematic structural diagram of a wall plate assembly in a nozzle and test section joint adjusting method in the flat cascade subsonic testing device of the present invention;
in the figure, 1, a mounting platform 2, a height-adjustable sound velocity spray pipe 3, a subsonic velocity test chamber 4 and an observation window are arranged;
201. support 202, fixed retraction section 203, adjustable height retraction section 204, height adjuster 205, hinge 206, sidewall plate 207, linear guide;
301. a housing 302, a test section disc 303, a wall plate assembly 304, a pull rod 305, an angle adjuster;
3031. the rotary plate 3032, the length adjuster 3033, the guide rail 3034, the rotary connecting seat 3035, the translation plate 3036, the tail plate 3037, the pull rod connecting seat 3038 and the sliding block.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, the flat cascade subsonic velocity testing device used in the method for joint adjustment of the nozzle and the test section in the flat cascade subsonic velocity testing device of the invention comprises an adjustable height sonic velocity nozzle 2 and a subsonic velocity test chamber 3 which are installed on an installation platform 1 and are sequentially connected along the airflow direction; a turbine blade cascade test model or a compressor blade cascade test model is arranged in the subsonic velocity test cabin 3, and an observation window 4 is arranged in the center of the left side wall and the right side wall of the subsonic velocity test cabin 3;
as shown in fig. 2, the adjustable altitude sonic velocity nozzle 2 is a square nozzle, and includes a fixed contraction section 202 and an adjustable altitude contraction section 203 which are installed on a support frame 201, are symmetrically arranged up and down along the airflow direction, and are sequentially connected in a contraction profile overlapping manner; two side wall plates 206 symmetrically installed at left and right sides of the supporting frame 201; the fixed contraction section 202, the height-adjustable contraction section 203 and the inner surfaces of the two side wall plates 206 form a nozzle flow channel; the two height adjusters 204 are symmetrically arranged above and below the supporting frame 201; the fixed end of the height adjuster 204 is fixed on the supporting frame 201, and the moving end of the height adjuster 204 is connected with the height adjustable contraction section 203 through a hinge 205; two groups of linear guide rails 207 are respectively arranged on the upper side and the lower side of the horizontal central line of the left side wall plate 206, and the included angle between the linear guide rails 207 and the horizontal direction is 35-55 degrees; the height-adjustable contraction section 203 is provided with sliding blocks which are respectively clamped on the corresponding linear guide rails 207; under the driving of the height adjuster 204, the moving end of the height adjuster 204 drives the sliding block of the height-adjustable contraction section 203 to move along the linear guide rail 207 through the hinge 205, and the height-adjustable contraction section 203 simultaneously slides along the contraction profile of the fixed contraction section 202 to realize the height adjustment of the outlet of the spray pipe;
as shown in fig. 2, the subsonic test chamber 3 is a square body, and includes a housing 301, two test section discs 302 mounted in parallel in the housing 301, two wall plate assemblies 303 mounted up and down in the housing 301, and two sets of corresponding angle adjusters 305 and pull rods 304; the two test section discs 302 are parallel to the axis of the subsonic test chamber 3 and are fixed on the left side and the right side of the axis in parallel, the lower ends of the test section discs 302 are installed on the lower surface of the shell 301, and the front ends of the test section discs 302 are connected with an airflow inlet flange of the shell 301; the front ends of the two upper and lower wall plate assemblies 303 are connected with the airflow outlet end of the height-adjustable sound velocity spray pipe 2 through a pin shaft, and the rear ends of the two upper and lower wall plate assemblies 303 are provided with length compensation plates; the fixed ends of the two angle adjusters 305 are respectively and symmetrically arranged on the upper surface and the lower surface of the shell 301, and the moving ends are respectively and symmetrically arranged on the upper wall plate component 303 and the lower wall plate component 303 through pin shafts; one end of each of the two pull rods 304 is fixed on the test section disc 302, and the other end of each of the two pull rods is fixed on the upper and lower wall plate assemblies 303, so that the upper and lower wall plates of the test section are supported in an auxiliary manner; the moving end of the angle adjuster 305 drives the two upper and lower wall plate assemblies 303 to rotate around the pin shaft to realize the height and angle adjustment of the upper and lower wall plate assemblies 303 of the test section, and the length adjustment of the upper and lower wall plate assemblies 303 of the test section is realized through the length compensation plate;
as shown in fig. 3, the wall plate assembly 303 includes an upper set and a lower set, each set includes a rotating plate 3031, a length adjuster 3032, a guide rail 3033, a rotating connecting seat 3034, a translational plate 3035 and a tail plate 3036; the rotating plate 3031 is a straight plate, the front end of the rotating plate 3031 is a fixed end, the fixed end is fixed at an airflow outlet of the sound velocity spray pipe 2 with adjustable height through a pin shaft, the rear end of the rotating plate 3031 is a free end, a guide rail 3033 is installed on the upper surface of the rotating plate 3031, a rotating connecting seat 3034 is further fixed on the upper surface of the rear section of the rotating plate 3031, and a through hole on the rotating connecting seat 3034 is used for installing an angle adjuster 305 to realize the angle adjustment of the rotating plate 3031 around the pin shaft at the rear end; the horizontal moving plate 3035 is another straight plate, a sliding block 3038 is fixed on the upper surface of the horizontal moving plate 3035, the sliding block 3038 is clamped on the guide rail 3033, a tail plate 3036 is installed at the rear end of the horizontal moving plate 3035, a pull rod connecting seat 3037 is installed on the upper surface of the tail plate 3036, and a through hole of the pull rod connecting seat 3037 is used for installing a pull rod 304 to realize the auxiliary support of the horizontal moving plate 3035; the fixed end of the length adjuster 3032 is arranged on the upper surface of the rotating plate 3031, and the moving end of the length adjuster 3032 is connected with the rear end of the translation plate 3035 through a pin shaft; the length regulator 3032 drives the sliding block 3038 on the translational plate 3035 to move along the guide rail 3033, so that the translational plate 3035 moves back and forth;
the space between the inner walls of the two test section discs 302, the two upper and lower wall plate assemblies 303 and the two upper and lower length compensation plates is a test section; the space between the outer walls of the two test section discs 302 and the shell 301 is a test section parking chamber;
the upper and lower wall plate assemblies 303 are connected with the height-adjustable contraction section 203 through a pin shaft; the fixed end of the angle adjuster 305 is fixed on the supporting frame 201, and the moving end of the angle adjuster 305 is connected with the rotary connecting seat 3034 through a pin shaft, so that the expansion angle adjustment of the upper and lower wall plate assemblies 303 is realized;
the joint debugging method comprises the following steps:
a. respectively detaching the pull rods 304 of the upper tail plate 3036 and the lower tail plate 3036;
b. respectively starting the upper and lower length regulators 3032, and adjusting the lengths of the upper and lower wall plates of the test section to zero positions;
c. respectively starting the upper angle regulator 305 and the lower angle regulator 305 to expand the upper wall plate and the lower wall plate by 3-5 degrees from zero;
d. according to the test state of the cascade model, calculating H1 of the height of a first blade of the cascade model from the center line of the flow channel and H2 of the height of a tail blade from the center line of the flow channel;
e. simultaneously starting the height adjuster 204 and the angle adjuster 305 above, adjusting the height of the first blade of the cascade model from the center line of the flow channel to H1, and keeping the 3-5-degree expansion angle of the upper wall plate unchanged in the process;
f. simultaneously starting a height adjuster 204 and an angle adjuster 305 below, adjusting the height of a tail blade of the cascade model from the center line of a flow channel to H2, keeping a 3-5-degree expansion angle of a lower wall plate unchanged in the process, and realizing the combined adjustment of the height of the airflow outlet of the height-adjustable sound velocity spray pipe 2 and the height of an upper wall plate assembly 303 and a lower wall plate assembly 303 of a test section;
g. respectively starting an upper angle regulator 305 and a lower angle regulator 305, and adjusting the expansion angles of the upper wall plate and the lower wall plate to zero positions;
h. starting the upper length regulator 3032 to drive the translational plate 3035 to move forwards and extend to the front edge of the first blade;
i. activating the lower length adjuster 3032 causes the translational plate 3035 to move forward to extend to the leading edge position of the trailing blade.
j. The pull rods 304 of the upper and lower tail plates 3036 are respectively installed.
Further, the pin shaft is replaced by a hinge, and the hinge is replaced by a pin shaft.
Furthermore, the front end of the height-adjustable contraction section 203 is provided with a sealing groove, a rubber strip is arranged in the sealing groove, and the overlapped molded surface between the fixed contraction section 202 and the height-adjustable contraction section 203 is sealed by the rubber strip.
Further, the height adjuster 204, the angle adjuster 305, and the length adjuster 3032 are lead screws or electric cylinders.
Furthermore, the front ends of the upper and lower wall plate assemblies 303 are provided with sealing grooves, and rubber strips are installed in the sealing grooves.
Further, the guide rail 3033 is a linear guide rail.
Example 1
The fixed contraction section 202 inlet size of the flat cascade subsonic velocity test device used in the jet pipe and test section joint adjustment method in the flat cascade subsonic velocity test device of the embodiment is 1340mm in height multiplied by 190mm in width, and the outlet height adjustment range of the height-adjustable nozzle 2 is 235 mm-445 mm; the angle adjusting range of the upper and lower wall plates is-5 degrees, and the length adjusting range of the upper and lower wall plates is 0-400 mm.
The flow field calibration shows that the deviation of the flow field core area of the test section of the subsonic speed test chamber 3 at the Mach number of 0.8 is superior to 0.003, and the advanced index of the low-speed wind tunnel and high-speed wind tunnel flow field quality requirement GJB 1179A-2012 is reached.
Although embodiments of the present invention have been disclosed above and described in considerable detail, this is not to be understood as a limitation of the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (6)
1. A jet pipe and test section joint debugging method in a plane cascade subsonic velocity test device is characterized in that the plane cascade subsonic velocity test device used in the joint debugging method comprises a height-adjustable sonic velocity jet pipe (2) and a subsonic velocity test chamber (3) which are arranged on an installation platform (1) and are sequentially connected along the airflow direction; a turbine blade cascade test model or a compressor blade cascade test model is installed in the subsonic velocity test chamber (3), and observation windows (4) are installed in the centers of the left side wall and the right side wall of the subsonic velocity test chamber (3);
the height-adjustable sound velocity spray pipe (2) is a square spray pipe and comprises a fixed contraction section (202) and a height-adjustable contraction section (203), wherein the fixed contraction section and the height-adjustable contraction section are arranged on a support frame (201), are symmetrically arranged up and down along the airflow direction, and are sequentially connected in a contraction profile overlapping mode; two side wall plates (206) symmetrically arranged at the left side and the right side of the support frame (201); the fixed contraction section (202), the height-adjustable contraction section (203) and the inner surfaces of the two side wall plates (206) form a spray pipe flow channel; the two height adjusters (204) are symmetrically arranged above and below the supporting frame (201); the fixed end of the height adjuster (204) is fixed on the support frame (201), and the moving end of the height adjuster (204) is connected with the height-adjustable contraction section (203) through a hinge (205); two groups of linear guide rails (207) are respectively arranged on the upper side and the lower side of the horizontal center line of the left side wall plate (206), and the included angle between the linear guide rails (207) and the horizontal direction is 35-55 degrees; the height-adjustable contraction section (203) is provided with sliding blocks which are respectively clamped on the corresponding linear guide rails (207); under the drive of the height adjuster (204), the moving end of the height adjuster (204) drives the sliding block of the height-adjustable contraction section (203) to move along the linear guide rail (207) through the hinge (205), and the height-adjustable contraction section (203) slides along the contraction profile of the fixed contraction section (202) at the same time to realize the height adjustment of the outlet of the spray pipe;
the subsonic speed test cabin (3) is a square body and comprises a shell (301), two test section discs (302) which are arranged in the shell (301) in parallel, two wall plate assemblies (303) which are arranged in the shell (301) up and down, and two groups of corresponding angle adjusters (305) and pull rods (304); the two test section discs (302) are parallel to the axis of the subsonic test chamber (3) and are fixed on the left side and the right side of the axis in parallel, the lower ends of the test section discs (302) are installed on the lower surface of the shell (301), and the front ends of the test section discs (302) are connected with an airflow inlet flange of the shell (301); the front ends of the two upper and lower wall plate assemblies (303) are connected with the airflow outlet end of the height-adjustable sound velocity spray pipe (2) through a pin shaft, and the rear ends of the two upper and lower wall plate assemblies (303) are provided with length compensation plates; the fixed ends of the two angle regulators (305) are respectively and symmetrically arranged on the upper surface and the lower surface of the shell (301), and the moving ends are respectively and symmetrically arranged on the upper wall plate component (303) and the lower wall plate component (303) through pin shafts; one end of each of the two pull rods (304) is fixed on the test section disc (302), and the other end of each of the two pull rods is fixed on the upper and lower wall plate assemblies (303), so that the effect of auxiliary support on the upper and lower wall plates of the test section is realized; the moving end of the angle adjuster (305) drives the two upper and lower wall plate assemblies (303) to rotate around the pin shaft to adjust the height and the angle of the upper and lower wall plate assemblies (303) of the test section, and the length of the upper and lower wall plate assemblies (303) of the test section is adjusted through the length compensation plate;
the wallboard component (303) comprises an upper group and a lower group, wherein each group comprises a rotating plate (3031), a length regulator (3032), a guide rail (3033), a rotating connecting seat (3034), a translational plate (3035) and a tail plate (3036); the rotating plate (3031) is a straight plate, the front end of the rotating plate (3031) is a fixed end, the fixed end is fixed at an airflow outlet of the height-adjustable sound velocity spray pipe (2) through a pin shaft, the rear end of the rotating plate (3031) is a free end, a guide rail (3033) is installed on the upper surface of the rotating plate (3031), a rotary connecting seat (3034) is further fixed on the upper surface of the rear section of the rotating plate (3031), and a through hole in the rotary connecting seat (3034) is used for installing an angle regulator (305) to realize angle regulation of the rotating plate (3031) around the pin shaft at the rear end; the horizontal moving plate (3035) is the other straight plate, a sliding block (3038) is fixed on the upper surface of the horizontal moving plate (3035), the sliding block (3038) is clamped on the guide rail (3033), a tail plate (3036) is installed at the rear end of the horizontal moving plate (3035), a pull rod connecting seat (3037) is installed on the upper surface of the tail plate (3036), and a through hole of the pull rod connecting seat (3037) is used for installing a pull rod (304) to realize auxiliary support of the horizontal moving plate (3035); the fixed end of the length regulator (3032) is arranged on the upper surface of the rotating plate (3031), and the moving end of the length regulator (3032) is connected with the rear end of the translational plate (3035) through a pin shaft; the length regulator (3032) drives the sliding block (3038) on the translational plate (3035) to move along the guide rail (3033) to realize the forward and backward movement of the translational plate (3035);
the space between the inner walls of the two test section discs (302), the two upper and lower wall plate assemblies (303) and the two upper and lower length compensation plates is a test section; the space between the outer walls of the two test section discs (302) and the shell (301) is a test section parking chamber;
the upper and lower wall plate components (303) are connected with the height-adjustable contraction section (203) through a pin shaft; the fixed end of the angle adjuster (305) is fixed on the support frame (201), and the moving end of the angle adjuster (305) is connected with the rotary connecting seat (3034) through a pin shaft, so that the expansion angle adjustment of the upper and lower wall plate assemblies (303) is realized; the joint debugging method comprises the following steps:
a. respectively removing the pull rods (304) of the upper tail plate (3036) and the lower tail plate (3036);
b. respectively starting an upper length regulator (3032) and a lower length regulator (3032), and adjusting the lengths of the upper wall plate and the lower wall plate of the test section to zero positions;
c. respectively starting an upper angle regulator (305) and a lower angle regulator (305) to expand the upper wall plate and the lower wall plate by 3-5 degrees from zero;
d. according to the test state of the cascade model, calculating H1 of the height of a first blade of the cascade model from the center line of the flow channel and H2 of the height of a tail blade from the center line of the flow channel;
e. simultaneously starting an upper height adjuster (204) and an upper angle adjuster (305), adjusting the height of a first blade of the cascade model from the center line of the flow channel to H1, and keeping an upper wall plate at an expansion angle of 3-5 degrees unchanged in the process;
f. simultaneously starting a height adjuster (204) and an angle adjuster (305) below, adjusting the height of a tail blade of the cascade model from the center line of a flow channel to H2, and keeping a 3-5-degree expansion angle of a lower wall plate unchanged in the process, thereby realizing the combined adjustment of the height of an airflow outlet of the height-adjustable sound velocity spray pipe (2) and the height of an upper wall plate assembly (303) and a lower wall plate assembly (303) of a test section;
g. respectively starting an upper angle regulator (305) and a lower angle regulator (305) to adjust the expansion angles of the upper wall plate and the lower wall plate to zero positions;
h. starting the upper length regulator (3032) to drive the translation plate (3035) to move forwards and extend to the front edge position of the first blade;
i. and the lower length regulator (3032) is started to drive the translation plate (3035) to move forwards to extend to the front edge position of the tail blade.
j. And pull rods (304) respectively provided with an upper tail plate (3036) and a lower tail plate (3036).
2. The method for joint adjustment of the nozzle and the test section in the flat cascade subsonic test device according to claim 1, characterized in that the hinge is replaced by a hinge and the hinge is replaced by a pin.
3. The method for jointly adjusting the nozzle and the test section in the flat cascade subsonic test device according to claim 1, wherein the front end of the height-adjustable contraction section (203) is provided with a sealing groove, a rubber strip is installed in the sealing groove, and the overlapped molded surface between the fixed contraction section (202) and the height-adjustable contraction section (203) is sealed by the rubber strip.
4. The method for jointly adjusting the nozzle and the test section in the flat cascade subsonic velocity test device according to claim 1, wherein the height adjuster (204), the angle adjuster (305) and the length adjuster (3032) are lead screws or electric cylinders.
5. The method for jointly adjusting the nozzle and the test section in the flat cascade subsonic test device according to claim 1, wherein the front ends of the upper and lower wall plate assemblies (303) are provided with sealing grooves, and rubber strips are installed in the sealing grooves.
6. The method for jointly adjusting the nozzle and the test section in the flat cascade subsonic velocity test device according to claim 1, characterized in that the guide rail (3033) is a linear guide rail.
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