CN113074943B - Oscillating total pressure distortion generating device - Google Patents
Oscillating total pressure distortion generating device Download PDFInfo
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- CN113074943B CN113074943B CN202110305439.5A CN202110305439A CN113074943B CN 113074943 B CN113074943 B CN 113074943B CN 202110305439 A CN202110305439 A CN 202110305439A CN 113074943 B CN113074943 B CN 113074943B
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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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
A swingable total pressure distortion generating apparatus is provided, which is mounted on an engine intake housing. Two identical distortion generators are mounted in an engine intake housing, each of the two distortion generators being inserted into the housing from opposite sides of the housing wall and merging in the housing. The distortion generator comprises a transmission shaft 1 and a blade turbulence device 2, the blade turbulence device 2 is a common plate type distortion generator, the transmission shaft 1 and the blade turbulence device 2 can transmit torque, the motor drives the rocker arm to drive the distortion generator to swing, and a fixing structure is arranged and used for fixing the motor, the left guide rail, the right guide rail and the air inlet casing. The swing distortion generator realizes the active adjustment of the steady-state/dynamic proportion of the total pressure distortion of the intake air, and has wide application prospect in the stability evaluation process of the aeroengine.
Description
Technical Field
The invention relates to an air inlet distortion simulation technology in the stability assessment of an aeroengine, in particular to a swingable total pressure distortion generating device which can realize active adjustment of air inlet total pressure distortion characteristics.
Background
For military aircraft, the combat mission is completed, the maneuver is inevitably required to be carried out, and the high-performance fighter aircraft is required to complete the maneuver with high difficulty such as cobra when necessary. In the large maneuvering process of the aircraft, the engine can bear strong air intake distortion, so that the influence of various air intake distortion on the stability of the engine is required to be evaluated in the development process. In the process of evaluating the stability of the engine, a distortion generator is adopted to generate a distortion flow field at the inlet of the engine, so as to analyze the change of the performance of the engine.
Typical distortion generators include total pressure distortion generators, swirl distortion generators, and the like. For the total pressure distortion generator, total pressure loss is generated in incoming flow, so that the total pressure of intake air is uneven, and the total pressure distortion is formed. The total pressure distortion flow field generated by the conventional total pressure distortion generator is stable and fixed, while in the large maneuver process of the advanced military aircraft, the total pressure distortion of the air inlet is unstable, namely the ratio of the steady-state total pressure distortion to the dynamic total pressure distortion is changed, which puts a new requirement on the total pressure distortion generator in the engine stability assessment, so that the distortion generator with adjustable steady-state/dynamic total pressure distortion ratio needs to be developed.
Disclosure of Invention
In order to realize active adjustment of steady-state/dynamic proportion of total pressure distortion of air intake of an aeroengine, the invention provides a swingable total pressure distortion generating device, and the device is installed on an air intake casing of the engine in the whole structure; wherein the method comprises the steps of
Installing two identical distortion generators in an engine air inlet casing, wherein the two distortion generators are respectively inserted into the air inlet casing from outside to inside from opposite sides of the air inlet casing wall to corresponding third through holes 103, and are converged in the air inlet casing, are in contact with each other or have a certain interval;
the distortion generator comprises a transmission shaft 1 and a blade turbulence device 2, and only the structure of one distortion generator is described below; the transmission shaft 1 is inserted into the air inlet casing from outside to inside from the third through hole 103 on one side of the air inlet casing wall, and reaches the inner wall surface of the air inlet casing, the two third through holes 103 are positioned on the opposite side of the air inlet casing wall, the connecting line of the circle centers of the two third through holes is a chord line on the inner circle of the tangential plane of the air inlet casing, and the direction is determined according to the requirement; the transmission shaft 1 is of a conventional shaft body structure, the inside of the transmission shaft is hollow, the transmission shaft internally comprises a first through hole 101 and a second through hole 102, the first through hole 101 and the second through hole 102 are communicated and have the same axis, the diameter of the first through hole 101 is DI, the diameter of the second through hole 102 is relatively large, and the nominal size is equal to the outer diameter of a long cylinder in the middle of the blade turbulence device 2; the middle of the blade turbulence device 2 is a strip cylinder, two rectangular plates are respectively arranged at two sides of the strip cylinder, and the positions of the two rectangular plates are symmetrical relative to the strip cylinder; the long cylinder protrudes from the rectangular plate at one side of the blade turbulence device 2 close to the wall of the air inlet casing; the blade turbulence device 2 is a plate-type distortion generator commonly used in the stability evaluation of the aero-engine, and the length L and the broadband W of the blade turbulence device are determined according to the stability evaluation specification of the aero-engine and the requirement on the comprehensive distortion index;
the mounting bearing 3 is positioned in the third through hole 103 on the inner wall of the air inlet casing and used for enabling the transmission shaft 1 to rotate, the outer part of the mounting bearing 3 is tightly contacted with the inner part of the air inlet casing, and the mounting bearing is fixedly arranged in the third through hole 103; the inside of the mounting bearing 3 is contacted with the transmission shaft 1, so that the mounting bearing can rotate in the air inlet casing; in addition, for fixedly mounting the bearing 3, on the one hand, the third through hole 103 comprises three circular steps, the diameter of the first step is equal to or slightly larger than the outer diameter of the transmission shaft 1, the diameter of the second step is equal to or slightly larger than the outer diameter of the mounting bearing 3 so as to ensure that the mounting bearing 3 is tightly matched with the air inlet casing, the third step is used for mounting a baffle plate, and the baffle plate is only used for pressing the mounting bearing 3 so as not to loosen during working, and the outer wall surface of the baffle plate is required to be flush with the inner surface of the air inlet casing; the diameters of the first step, the second step and the third step are sequentially increased;
in order to enable the transmission shaft 1 and the blade turbulence device 2 to transmit torque, the outer end of the blade turbulence device 2 is provided with a protruding part along the axial direction; correspondingly, the inner wall of the transmission shaft 1 is provided with a groove corresponding to the shape of the convex part; during assembly, firstly, the protruding part of the blade turbulence device 2 is inserted into the corresponding groove of the transmission shaft 1, the cross section shape of the protruding part corresponds to the cross section shape of the groove, the cross section size of the protruding part is slightly smaller than the cross section size of the groove, and the protruding part and the groove are in a key groove structure; then, the transmission shaft 1 and the blade turbulence device 2 are fixedly connected through a fastening device from outside to inside;
the third rocker arm 33 is used for driving the distortion generator to swing and comprises an upper end ring and a rod part below the ring; the third rocker arm 33 is fixedly connected with the transmission shaft 1, and for this purpose, the outer end of the transmission shaft 1 is provided with a protruding part along the axial direction; correspondingly, the inner wall of the third rocker arm 33 is provided with a concave part corresponding to the shape of the convex part, the concave part is matched with the convex part when the third rocker arm 33 is inserted into the transmission shaft 1, and the convex part and the groove are in a key groove structure; the total number of the third rocker arms 33 is two, the hollow circular rings at the upper ends of the third rocker arms are respectively sleeved at the leftmost end and the rightmost end of the part 1 outside the air inlet casing, and the lower ends of the rod parts of the third rocker arms are respectively fixedly connected with the front ends of the guide rails; two guide rails fixedly connected with the lower ends of the two third rocker arms 33 are arc-shaped long sticks, the center of the arc coincides with the center of the transmission shaft 1, and the extending direction of the guide rails is perpendicular to the length direction of the third rocker arms 33; when the motor works, the motor drives the guide rail to reciprocate, and the guide rail swings with the rocker arm 33, so that the distortion generator is driven to swing;
at the rear ends of the left and right guide rails, the two guide rails are fixedly connected together by a reciprocating rod, and the reciprocating rod is a cylindrical long rod;
one end of the first rocker arm 11 is fixedly connected with the output end of the motor, and the other end of the first rocker arm 11 is fixedly connected with one end of the second rocker arm 22; a through hole is drilled in the middle of the other end of the second rocker arm 22, and a reciprocating rod passes through the through hole of the second rocker arm 22; the first rocker arm 11, the second rocker arm 22, the reciprocating rod and the guide rail form a reciprocating structure together; under the drive of a motor, the first rocker arm 11 rotates, the first rocker arm 11 drives the second rocker arm 22 to move, the second rocker arm 22 drives the reciprocating rod to move back and forth, the reciprocating rod moves back and forth to drive the guide rail to reciprocate back and forth, and the third rocker arm 33 is driven to swing around the center of the component 1 through the back and forth reciprocating movement of the guide rail;
and a fixing structure is arranged and used for fixing the motor, the left and right guide rails and the air inlet casing. In a specific embodiment of the invention, the two rectangular plates of the blade spoiler 2 are in the same plane.
In another embodiment of the invention, the two rectangular plates of the blade spoiler 2 are at an angle different from 180 degrees.
In a further embodiment of the present invention, the drive shaft 1 and the blade spoiler 2 are fixedly connected by fastening bolts by screwing the bolts from outside to inside into the threaded holes in the blade spoiler 2 through the first through hole 101 and the second through hole 102 in the drive shaft 1.
In one embodiment of the present invention,
the total length of the strip cylinder of the blade turbulence device 2 should not be larger than the radius of the air inlet casing;
the length of the protruding part of the blade turbulence device 2 along the axial direction should not be larger than the axial length of the second through hole 102, and the sum of the protruding part and the length L of the blade turbulence device 2 should not be larger than the radius of the air inlet casing;
the length of the boss of the drive shaft 1 in the axial direction depends on the length of the third rocker arm 33 in the axial direction, and should be slightly larger than this length.
In yet another embodiment of the present invention, the securing structure includes a vertical back plate, left and right vertical plates, and left and right securing blocks; the vertical rear plate is used for fixing the whole total pressure distortion generating device and is a vertical plate in total; the left vertical plate and the right vertical plate are respectively fixed on the left side and the right side of the front of the vertical rear plate; the left and right fixing blocks are respectively fixed on the inner sides of the left and right vertical plates, and the positions of the left and right fixing blocks are opposite; and each fixed block is perforated from front to back, the shape of the hole is convenient for the arc-shaped guide rail to freely pass through from front to back, and the section shape of the hole is respectively consistent with and slightly larger than the corresponding section shape of the guide rail, so that the guide rail is easy to slide back and forth.
The invention provides a swinging total pressure distortion generating device, which realizes the active adjustment of the steady-state/dynamic proportion of the total pressure distortion of intake through a swinging distortion generator and has wide application prospect in the stability evaluation process of an aeroengine.
Drawings
FIG. 1 shows the overall structure of a distortion generating apparatus and its mounting on an engine intake casing;
FIG. 2 shows a specific three-dimensional structure and mounting of the distortion generator;
FIG. 3 shows a specific assembly relationship of the different components of the distortion generator, wherein FIG. 3 (1) shows a front view of the assembly relationship, FIG. 3 (2) shows a cross-sectional view of section A-A in FIG. 3 (1), FIG. 3 (3) shows a cross-sectional view C-C of section C-C in FIG. 3 (1), and FIG. 3 (4) shows a cross-sectional view of section B-B in FIG. 3 (1);
FIG. 4 shows a specific mounting arrangement of a bearing on an air intake housing;
fig. 5 shows an assembling structure of the fixing plate and the air intake casing.
Detailed Description
Fig. 1 shows the installation of the entire structure of the distortion generating apparatus on an engine intake housing. Two identical distortion generators are arranged in an engine air inlet casing, the two distortion generators are respectively inserted into the air inlet casing from outside to inside from opposite sides of the air inlet casing wall, the two distortion generators are converged at the approximate center of the air inlet casing, and a bearing is arranged at the fixedly connected part of the distortion generators and the air inlet casing, so that the distortion generators can swing around the center. A fixed plate is arranged on an engine air inlet casing, a motor is arranged on the fixed plate, a reciprocating rod is driven by a rocker arm during operation of the motor, the reciprocating rod moves forwards and backwards along the axial direction of the air inlet casing under the limit of a guide rail, one side of the guide rail is connected with the rocker arm, and the guide rail and the reciprocating rod drive the rocker arm to rotate in a reciprocating manner in the forward and backward movement process, so that a distortion generator is driven to rotate in a reciprocating manner. The specific design method of each component is as follows.
Fig. 2 shows a specific three-dimensional structure of the distortion generator and the mounting manner. The distortion generator comprises a transmission shaft 1 and a blade turbulence device 2 (since two identical distortion generators are assembled and installed in the air inlet casing, only the structure of one distortion generator is described below). The transmission shaft 1 is inserted into the air inlet casing from outside to inside from a third through hole 103 (fig. 4) on one side (left side or right side) of the air inlet casing wall, and reaches the inner wall surface of the air inlet casing, two third through holes 103 are positioned on the opposite side of the air inlet casing wall, and the connecting line of the circle centers of the two third through holes is a chord line on the inner circle of the tangential plane of the air inlet casing, and the direction is determined according to the requirement. As shown in fig. 3 (2), the transmission shaft 1 is of a conventional shaft body structure, and is designed to be hollow in the interior, wherein the interior comprises a first through hole 101 and a second through hole 102 which are communicated and coincide with each other, the diameter of the first through hole 101 is DI, the diameter of the second through hole 102 is relatively large, and the nominal size is equal to the outer diameter of the middle long cylinder of the blade turbulence device 2. The middle of the blade turbulence device 2 is a strip cylinder, two sides of the strip cylinder are respectively provided with two rectangular plates, the two rectangular plates are integrally formed, the positions of the two rectangular plates are symmetrical relative to the strip cylinder, and in one embodiment of the invention, the two rectangular plates are in the same plane; the two rectangular plates may also be at an angle different from 180 degrees, depending on the particular needs. For convenient installation, be close to air inlet casing wall one side at blade vortex device 2, make rectangular cylinder protrusion in the rectangular plate, be convenient for follow-up with blade vortex device 2 insert transmission shaft 1, in order to guarantee distortion generator in the smooth installation of air inlet casing, the total length of rectangular cylinder should not be greater than air inlet casing radius. The blade turbulence device 2 is a plate-type distortion generator commonly used in the stability evaluation of the aero-engine, the length L and the broadband W of the blade turbulence device are determined according to the stability evaluation specification of the aero-engine and the requirement on the comprehensive distortion index, and the length L and the broadband W are not repeated here.
The mounting bearing 3 is positioned in the third through hole 103 on the inner wall of the air inlet casing and used for enabling the transmission shaft 1 to rotate, the outer part of the mounting bearing 3 is tightly contacted with the inner part of the air inlet casing, and the mounting bearing is fixedly arranged in the third through hole 103; the bearing 3 is mounted internally in contact with the drive shaft 1, enabling it to rotate within the inlet casing as is well known to the person skilled in the art, and will not be described. In addition, for the fixed mounting bearing 3, on the one hand, the third through hole 103 includes three circular steps, and first step diameter is equal to or slightly more than the external diameter of transmission shaft 1, and the diameter of second step is equal to or slightly more than the external diameter of mounting bearing 3 (guarantee that mounting bearing 3 and inlet casing tight fit), and the third step is used for installing the baffle, and this baffle is the annular sheet metal, and its size only is used for compressing tightly mounting bearing 3, makes it can not become flexible in the course of the work, and specific size is determined as required, but the outer wall face of baffle must be flush with inlet casing internal face, guarantees can not cause concave surface or convex surface in the inlet casing inside, influences the flow field. Obviously, the diameters of the first step, the second step and the third step are sequentially increased.
In order to enable the transmission shaft 1 and the blade spoiler 2 to transmit torque, as shown in fig. 3 (3), the outer end of the blade spoiler 2 is provided with a protruding portion along the axial direction, the cross section of the protruding portion is generally rectangular, the length of the protruding portion along the axial direction should not be greater than the axial length of the second through hole 102, and the sum of the protruding portion and the length L of the blade spoiler 2 should not be greater than the radius of the air inlet casing; correspondingly, the inner wall of the drive shaft 1 has a recess corresponding to the shape of the boss. During assembly, firstly, the protruding part of the blade turbulence device 2 is inserted into the corresponding groove of the transmission shaft 1, the cross section shape of the protruding part corresponds to the cross section shape of the groove, the cross section size of the protruding part is slightly smaller than the cross section size of the groove, and the protruding part and the groove are of a key groove structure commonly used in mechanical transmission; then, the bolts are screwed into the threaded holes in the blade spoiler 2 from outside to inside (from outside the air inlet casing to inside the air inlet casing) through the first through holes 101 and the second through holes 102 in the driving shaft 1, and finally the driving shaft 1 and the blade spoiler 2 are fixedly connected through the fastening bolts. This technique is well known to those skilled in the art and will not be described in detail.
The third rocker arm 33 is used for driving the distortion generator to swing, and comprises an upper end ring and a rod part below the ring. The third rocker arm 33 is fixedly connected with the transmission shaft 1, for this purpose, as shown in fig. 3 (4), the outer end of the transmission shaft 1 is provided with a protruding part along the axial direction, and the length of the protruding part along the axial direction generally depends on the length of the third rocker arm 33 along the axial direction and should be slightly larger than the length; correspondingly, the inner wall of the third rocker arm 33 is provided with a concave part corresponding to the shape of the convex part, and the concave part is matched with the convex part when the third rocker arm 33 is inserted into the transmission shaft 1, so that the purpose of transmitting torque to the transmission shaft 1 of the distortion generator is achieved, wherein the convex part and the concave groove are of a key groove structure commonly used in mechanical transmission, and the connection mode is well known to a person skilled in the art. The third rocker arms 33 are two in total, the hollow circular rings at the upper ends of the third rocker arms are respectively sleeved at the leftmost end and the rightmost end of the part 1 outside the air inlet casing, and the lower ends of the rod parts of the third rocker arms are respectively fixedly connected with the front ends of the guide rails. Two guide rails fixedly connected with the lower ends of the two third rocker arms 33 are arc-shaped long sticks, the center of the arc coincides with the center of the transmission shaft 1, and the extending direction of the guide rails is perpendicular to the length direction of the third rocker arms 33. When the motor is in operation, the motor drives the guide rail to reciprocate, and the guide rail drives the rocker arm 33 to swing, so that the distortion generator is driven to swing.
The fixing plate comprises a vertical back plate, a left vertical plate, a right vertical plate, a left fixing block and a right fixing block. The vertical back plate is used for fixing the whole total pressure distortion generating device, and is a vertical plate. The left vertical plate and the right vertical plate are respectively fixed on the left side and the right side in front of the vertical rear plate. The left and right fixing blocks are respectively fixed on the inner sides of the left and right vertical plates, and the positions of the left and right fixing blocks are opposite. And each fixed block is perforated from front to back, and the holes are arc through holes, so that the arc guide rail can freely pass through the holes from front to back, the section shape of each hole is respectively consistent with the corresponding section shape of the guide rail and slightly larger than the corresponding section shape of the guide rail, and the guide rail is easy to slide back and forth.
At the rear ends of the left and right guide rails, the guide rails are fixedly connected together by a reciprocating rod, which is usually a cylindrical long rod.
One end of the first rocker arm 11 is fixedly connected with the output end of the motor, and the other end of the first rocker arm 11 is fixedly connected with one end of the second rocker arm 22; a through hole is bored in the middle of the other end of the second rocker arm 22, and a reciprocating lever passes through the through hole of the second rocker arm 22. The first rocker arm 11, the second rocker arm 22, the reciprocating lever, and the guide rail together form a typical reciprocating structure, which is well known to those skilled in the art and will not be described in detail. Under the drive of the motor, the first rocker arm 11 rotates, the first rocker arm 11 drives the second rocker arm 22 to move, the second rocker arm 22 drives the reciprocating rod to move back and forth, the reciprocating rod moves back and forth to drive the guide rail to reciprocate back and forth, and the guide rail reciprocates back and forth to drive the third rocker arm 33 to swing around the center of the component 1. The structure of this part is well known to those skilled in the art and will not be described in detail.
Fig. 3 shows a specific assembly relationship of the different components in fig. 2, (1) is a front view, (2) is a sectional view of section A-A, (3) is a sectional view of section C-C, and (4) is a sectional view of section B-B.
As shown in (1) and (2), the center of the blade turbulence device 2 is a cylinder, a threaded hole is formed in the cylinder, the threaded hole is MX, X represents a large diameter of the thread, X is generally not less than 30mm and not more than 50mm, and the value of the diameter D2 of the cylinder is suggested as: d2 When the distortion generator component 2 is mounted, the distortion generator component 2 is placed in the air inlet casing, and then the component 1 is assembled with the component 2 by passing through a mounting bearing 3 mounted on the air inlet casing.
As shown in (1) and (2), the component 1 is a hollow cylinder, the outer diameter is D1, the inside of the hollow cylinder comprises a first through hole 101 and a second through hole 102, the component 2 is inserted into the second through hole 102, the diameter of the first through hole 101 is DI, the diameter of the second through hole 102 is D2, and the relation between the parameters is suggested as follows: d1 D2+10mm and di=x+2 mm; as shown in (3), the second through hole 102 comprises an inner groove, the part of the transmission shaft 1 inserted into the second through hole 102 comprises a convex key, the groove and the key are matched to transmit torque required by swinging, the value of the size S1 of the key is recommended to be 6-8 mm, and the value of the size S2 is recommended to be 3-5 mm; when the blade spoiler 2 is assembled, after the blade spoiler 2 is inserted into the second through hole 102, a bolt with the same MX number passes through the first through hole 101 and is screwed into an inner threaded hole of the blade spoiler 2, so that the fastening of the transmission shaft 1 and the blade spoiler 2 is completed, and a complete distortion generator is formed, wherein the effective length Y of the threads in the threaded hole is recommended to be 1.5 times X, the length Y1 of the second through hole 102 is recommended to be 10mm, and the length Y2 of the first through hole 101 is recommended to be 3 times the wall thickness of the air inlet casing.
As shown in (1), (2) and (4), the third rocker arm 33 is assembled with the transmission shaft 1, a protruding key is arranged on an outer ring of the transmission shaft 1, an inner groove is arranged on an inner ring assembled by the third rocker arm 33 and the transmission shaft 1, the groove is matched with the key during assembly, torque of the rocker arm is transmitted to the transmission shaft 1 so as to drive the distortion generator to swing, the size S3 of the key is the same as the size S1, the value of the key S4 is the same as the value of the key S2, the diameter D4 of an outer ring in the third rocker arm 33 is suggested to be d4=d1+10mm, and the diameter D5 of the cylindrical transmission rod is suggested to be D4/3.
Fig. 4 shows a specific mounting structure of the mounting bearing 3 on the intake casing. In fig. 3, the transmission shaft 1 is inserted into the air inlet casing through the third through hole 103, the mounting bearing 3 is placed in the first step 201, the second step 202 is used for placing the bearing cover plate, and the platform of the second step 202 is provided with a threaded hole, so that the fastening of the bearing cover plate and the air inlet casing is completed by bolts, the bolts are recommended to be bolts with the number of M5 or M6, and the bearing cover plate and the air inlet casing are fastened and then are pressed against the bearing, so that the fixing of the bearing can be completed.
The design flow of the reciprocating mechanism in fig. 1 is very mature, and is not repeated here, and three points are guaranteed in the specific design process: firstly, the reciprocating frequency of the guide rail meets the requirement of the reciprocating frequency of the distortion generator in the stability assessment of the aeroengine, secondly, the reciprocating stroke of the guide rail meets the requirement of the reciprocating amplitude of the distortion generator in the stability assessment of the aeroengine, and thirdly, the force output by the guide rail can drive the distortion generator to swing. For the first point, in the process of evaluating the stability of the aero-engine, the pulsation of the total pressure distortion is low-frequency pulsation, and the pulsation frequency is generally not higher than 2V/D, wherein V is the air inlet speed of the aero-engine, and D is the diameter of an air inlet casing. For the second point, assuming that the maximum swing angle of the distortion generator required in the stability assessment of the aeroengine is alpha, and the length of the rocker arm 33 is l, the stroke of the reciprocating motion of the guide rail is lsin alpha. For the third point, let the air intake speed of the aero-engine be V, the dimension L, W in FIG. 3 is known as ρ, the air density is denoted as F, and the force output by the guide rail is F, then F is greater than or equal to ρV 2 L 2 W/8l。
Fig. 5 shows an assembly structure of the fixing plate and the intake casing in fig. 1. In order to connect the fixed plate and the air inlet casing into a whole, a flange is welded on the air inlet casing, the thickness of the flange is recommended to be 15-20 mm thick steel plate, the circumferential and radial dimensions of the flange are capable of ensuring that 6-8 through holes uniformly distributed along the circumferential direction can be formed in the flange, and the diameter of the through holes is recommended to be 14-18 mm. It is suggested that the upper end of the vertical rear plate is processed into an arc shape, the chord of the arc shape is above the arc line, the arc shape is consistent with a part of the arc shape of the circumference of the air inlet casing, meanwhile, 6 to 8 through holes with the same size are formed at the corresponding positions of the vertical rear plate, and the fixing plate and the air inlet casing are fastened together through the through holes by using bolts M12 to M16.
Claims (6)
1. A swingable total pressure distortion generating device is provided, and the whole structure of the device is arranged on an engine air inlet casing; it is characterized in that
Installing two identical distortion generators in an engine air inlet casing, wherein the two distortion generators are respectively inserted into the air inlet casing from outside to inside from opposite sides of the air inlet casing wall to corresponding third through holes (103), and are converged in the air inlet casing, and the two distortion generators are contacted or have a certain interval;
the distortion generator comprises a transmission shaft (1) and a blade turbulence device (2), and only the structure of one distortion generator is described below; the transmission shaft (1) is inserted into the air inlet casing from outside to inside from a third through hole (103) on one side of the air inlet casing wall, and reaches the inner wall surface of the air inlet casing, two third through holes (103) are positioned on the opposite side of the air inlet casing wall, the connecting line of the circle centers of the two third through holes is a chord line on the inner circle of the tangential plane of the air inlet casing, and the direction is determined according to the requirement; the transmission shaft (1) is of a conventional shaft body structure, the inside of the transmission shaft is hollow, the transmission shaft is internally provided with a first through hole (101) and a second through hole (102), the first through hole (101) and the second through hole are communicated, the axes of the first through hole and the second through hole are coincident, the diameter of the first through hole (101) is DI, the diameter of the second through hole (102) is relatively large, and the nominal size of the second through hole is equal to the outer diameter of the middle long cylinder of the blade turbulence device (2); the middle of the blade turbulence device (2) is a strip cylinder, two rectangular plates are respectively arranged at two sides of the strip cylinder, and the positions of the two rectangular plates are symmetrical relative to the strip cylinder; the side, close to the wall of the air inlet casing, of the blade turbulence device (2) is provided with a strip cylinder protruding from a rectangular plate; the blade turbulence device (2) is a plate type distortion generator commonly used in the stability evaluation of the aero-engine, and the length L and the broadband W of the blade turbulence device are determined according to the stability evaluation specification of the aero-engine and the requirement on the comprehensive distortion index;
the mounting bearing (3) is positioned in a third through hole (103) on the inner wall of the air inlet casing and used for enabling the transmission shaft (1) to rotate, the outer part of the mounting bearing (3) is tightly contacted with the inner part of the air inlet casing, and the mounting bearing is fixedly arranged in the third through hole (103); the inside of the mounting bearing (3) is contacted with the transmission shaft (1) so that the mounting bearing can rotate in the air inlet casing; in addition, for fixedly mounting the bearing (3), on the one hand, the third through hole (103) comprises three circular steps, the diameter of the first step is equal to or slightly larger than the outer diameter of the transmission shaft (1), the diameter of the second step is equal to or slightly larger than the outer diameter of the mounting bearing (3) so as to ensure that the mounting bearing (3) is tightly matched with the air inlet casing, the third step is used for mounting a baffle, and the baffle is only used for pressing the mounting bearing (3) so as not to loosen in the working process, and the outer wall surface of the baffle is required to be flush with the inner surface of the air inlet casing; the diameters of the first step, the second step and the third step are sequentially increased;
in order to enable the transmission shaft (1) and the blade turbulence device (2) to transmit torque, the outer end of the blade turbulence device (2) is provided with a protruding part along the axial direction; correspondingly, the inner wall of the transmission shaft (1) is provided with a groove corresponding to the shape of the convex part; during assembly, the protruding part of the blade turbulence device (2) is inserted into the corresponding groove of the transmission shaft (1), the cross section shape of the protruding part corresponds to the cross section shape of the groove, the cross section size of the protruding part is slightly smaller than the cross section size of the groove, and the protruding part and the groove are in a key groove structure; the transmission shaft (1) is fixedly connected with the blade turbulence device (2) from outside to inside through a fastening device;
the third rocker arm (33) is used for driving the distortion generator to swing and comprises an upper end ring and a rod part below the ring; the third rocker arm (33) is fixedly connected with the transmission shaft (1), and for the purpose, a protruding part is arranged at the outer end of the transmission shaft (1) along the axial direction; correspondingly, the inner wall of the third rocker arm (33) is provided with a concave part corresponding to the shape of the convex part, the concave part is matched with the convex part when the third rocker arm (33) is inserted into the transmission shaft (1), and the convex part and the groove are in a key groove structure; the two third rocker arms (33) are in total, the hollow circular rings at the upper ends of the third rocker arms are respectively sleeved at the leftmost end and the rightmost end of the part (1) outside the air inlet casing, and the lower ends of the rod parts of the third rocker arms are respectively fixedly connected with the front ends of the guide rails; two guide rails fixedly connected with the lower ends of the two third rocker arms (33) are arc-shaped long sticks, the center of the arc coincides with the center of the transmission shaft (1), and the extending direction of the guide rails is perpendicular to the length direction of the third rocker arms (33); when the motor works, the motor drives the guide rail to reciprocate, the guide rail drives the rocker arm (33) to swing, and then the distortion generator is driven to swing;
at the rear ends of the left guide rail and the right guide rail, the two guide rails are fixedly connected together by a reciprocating rod, and the reciprocating rod is a cylindrical long rod;
one end of the first rocker arm (11) is fixedly connected with the output end of the motor, and the other end of the first rocker arm (11) is fixedly connected with one end of the second rocker arm (22); a through hole is drilled in the middle of the other end of the second rocker arm (22), and the reciprocating rod passes through the through hole of the second rocker arm (22); the first rocker arm (11), the second rocker arm (22), the reciprocating rod and the guide rail form a reciprocating structure together; under the drive of a motor, the first rocker arm (11) rotates, the first rocker arm (11) drives the second rocker arm (22) to move, the second rocker arm (22) drives the reciprocating rod to move back and forth, the reciprocating rod moves back and forth to drive the guide rail to reciprocate back and forth, and the third rocker arm (33) is driven to swing around the center of the component (1) through the back and forth reciprocating movement of the guide rail;
and a fixing structure is arranged and used for fixing the motor, the left and right guide rails and the air inlet casing.
2. A swingable total pressure distortion generating device according to claim 1, wherein the two rectangular plates of the blade spoiler (2) are in the same plane.
3. A swingable total pressure distortion generating device according to claim 1, wherein the two rectangular plates of the blade spoiler (2) are at an angle different from 180 degrees.
4. The swingable total pressure distortion generating apparatus according to claim 1, wherein the transmission shaft 1 is fixedly connected with the blade spoiler 2 by fastening the bolts by screwing the bolts from outside to inside into the screw holes inside the blade spoiler 2 through the first through holes 101 and the second through holes 102 inside the transmission shaft 1.
5. The apparatus of claim 1, wherein the oscillating total pressure distortion generator comprises,
the total length of the strip cylinder of the blade turbulence device (2) is not larger than the radius of the air inlet casing;
the length of the protruding part of the blade turbulence device (2) along the axial direction is not larger than the axial length of the second through hole (102), and the sum of the protruding part and the length L of the blade turbulence device (2) is not larger than the radius of the air inlet casing;
the length of the protruding part of the transmission shaft (1) along the axial direction is dependent on the length of the third rocker arm (33) along the axial direction, and the length of the protruding part of the transmission shaft (1) along the axial direction is larger than the length of the third rocker arm (33) along the axial direction.
6. The swingable total pressure distortion generating apparatus according to claim 1, wherein the fixing structure comprises a vertical rear plate, left and right vertical plates, and left and right fixing blocks; the vertical rear plate is used for fixing the whole total pressure distortion generating device and is a vertical plate in total; the left vertical plate and the right vertical plate are respectively fixed on the left side and the right side of the front of the vertical rear plate; the left and right fixing blocks are respectively fixed on the inner sides of the left and right vertical plates, and the positions of the left and right fixing blocks are opposite; and each fixed block is perforated from front to back, the shape of the hole is convenient for the arc-shaped guide rail to freely pass through from front to back, and the section shape of the hole is respectively consistent with and slightly larger than the corresponding section shape of the guide rail, so that the guide rail is easy to slide back and forth.
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| CN114459764B (en) * | 2022-03-10 | 2023-12-08 | 中国人民解放军空军工程大学 | Rotatable total pressure distortion generating device |
| CN115436157B (en) * | 2022-11-09 | 2023-03-24 | 中国科学院工程热物理研究所 | Total pressure distortion generator with continuously adjustable intake distortion intensity |
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| SE508720C2 (en) * | 1995-06-06 | 1998-11-02 | Volvo Ab | Distortion detection apparatus in piston engine |
| JP3488696B2 (en) * | 2001-02-19 | 2004-01-19 | 丸和電機株式会社 | High-speed rotation test equipment |
| FR2952434B1 (en) * | 2009-11-12 | 2012-06-29 | Snecma | DISTORTION GRID CAPABLE OF ADJUSTING THE OBSTRUCTION OF AN AIR FLOW INTO A TURBOREACTOR |
| CN106404407B (en) * | 2016-10-20 | 2018-08-14 | 北京动力机械研究所 | Adjustable fanning strip flow distortion simulator |
| CN107687948B (en) * | 2017-09-29 | 2023-09-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Air inlet total pressure and vortex flow coupling distortion generator and distortion test method |
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