CN111289211B - Dynamic eccentric separation device applied to model interstage dynamic separation wind tunnel test - Google Patents
Dynamic eccentric separation device applied to model interstage dynamic separation wind tunnel test Download PDFInfo
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Abstract
The invention discloses a dynamic eccentric separation device applied to a model interstage dynamic separation wind tunnel test. The device sequentially comprises a three-arm support body, an extension shaft wrapped in a shaft sleeve and used for driving the three-arm support body to move, and a support connecting body connected with the shaft sleeve and fixed on a wind tunnel middle mechanism from front to back. The device can resist the impact of air flow, the initial positions of the main body stage model and the separator stage model in the air flow are kept unchanged, the separator stage model is quickly separated after receiving a separation instruction, and the separator stage model moves freely in a wind tunnel flow field until recovery. The central axis of the device is positioned below the central axis of the separator stage model, the falling stroke of the separator stage model is larger, the device has the advantages of compact structure, reasonable layout, convenient use, high assembly precision, high separation speed, high use efficiency, good motion stability and high reliability, is more economical, can meet the requirement of rapid separation model in the process of wind tunnel model stage dynamic separation test, and has popularization and application values.
Description
Technical Field
The invention belongs to the technical field of wind tunnel tests, and particularly relates to a dynamic eccentric separation device applied to a model interstage dynamic separation wind tunnel test.
Background
At present, some aircrafts adopt a layout mode that a main body stage and a separation body stage are connected in series, and in the separation process of the main body stage and the separation body stage, a complex flow phenomenon exists between the main body stage and the separation body stage, and the aerodynamic characteristics and the flying posture of the main body stage and the separation body stage are seriously influenced along with mutual interference, and even the success or failure of a separation scheme is influenced. Therefore, it is necessary to develop a related wind tunnel test to investigate in advance how much the separation effect is, whether the separation failure is caused by collision of the main body stage and the separation body stage in the separation process.
In the process of the wind tunnel model interstage dynamic separation test, the main body stage and the separation body stage are firstly kept as a whole, the separation is started after the wind tunnel is started and the air flow is stable, the transient pressure or aerodynamic force of a model research position in the separation process is measured, and meanwhile, the dynamic process of the separation is recorded in real time by a high-speed shooting method.
The wind tunnel model interstage dynamic separation test is used as an important means for researching the separation process of the hypersonic aircraft, can simulate the flight attitude and the mutual position relationship of the aircraft main body and the separation body in the separation process, and can obtain the aerodynamic characteristics and the separation track of the aircraft main body and the separation body in the separation process through corresponding force measurement, pressure measurement and high-speed shooting. Accurate and reliable test data can be provided for the design of the aircraft separation scheme, so that the risk is reduced; meanwhile, the rationality and the safety of the existing hypersonic aircraft separation scheme can be evaluated.
Currently, development of a dynamic eccentric separation device applied to a model interstage dynamic separation wind tunnel test is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a dynamic eccentric separation device applied to a model interstage dynamic separation wind tunnel test.
The invention relates to a dynamic eccentric separation device applied to a model interstage dynamic separation wind tunnel test, which is characterized by sequentially comprising a three-arm support body, an extension shaft which is wrapped in a shaft sleeve and drives the three-arm support body to move, and a support connecting body which is connected with the shaft sleeve and is fixed on a wind tunnel middle mechanism from front to back; the radius of the connecting shaft sleeve is R;
the central axis of the support body of the three-arm support body, the central axis of the special-shaped pushing shaft and the central axis of the lengthening shaft are coaxial;
the support body is a step tubular body, the step I of the support body is a cylinder I with a radial section radius R1 from front to back, and R1 is less than or equal to R; the support body step II is a special-shaped prism I, and a cavity I is formed between the support body step I and the support body step II; the support body step III is a special-shaped prism II; the support body step IV is a cylinder II with a radial section radius R, and the tail end of the support body is inserted into the shaft sleeve and fixed by a radial set screw of the shaft sleeve;
the front end of the special-shaped pushing shaft is a triangular prism, and the front end of the special-shaped pushing shaft is positioned in a cavity I of the supporting body; the middle part of the special-shaped pushing shaft is a cylinder III, and the cylinder III is positioned on the central axis of the support body and reciprocates in the support body; the tail end of the special-shaped pushing shaft is a cylinder IV, and the cylinder IV is inserted into the front end of the lengthening shaft and is fixed at the front end of the lengthening shaft through threaded connection and nuts;
the radial section shapes of the special-shaped prism I and the special-shaped prism II are obtained by taking a circle with the radius r and respectively drawing a small equilateral triangle and a large equilateral triangle which are parallel with each other by taking the circle center as the center; the vertex of the small equilateral triangle is positioned in the circle, the left and right hypotenuses of the small equilateral triangle and the circular arc line segments corresponding to the bottom edges are connected into a closed curve I, and the shape of the closed curve I is the radial section shape of the special-shaped prism I; the vertex of the large equilateral triangle is positioned outside the circle, the left and right hypotenuses of the large equilateral triangle and the circular arc line segments corresponding to the bottom edges are connected into a closed curve II, and the closed curve II is the radial section shape of the special-shaped prism II; the special-shaped prism I and the special-shaped prism II are provided with shared cambered surfaces, the left tangential planes of the special-shaped prism I and the special-shaped prism II are parallel, and the right tangential planes of the special-shaped prism I and the special-shaped prism II are also parallel; the cross section of the triangular prism is an isosceles triangle, the left and right hypotenuses of the isosceles triangle are respectively overlapped with the left and right hypotenuses of the small equilateral triangle, the lengths of the left and right hypotenuses of the isosceles triangle are smaller than those of the left and right hypotenuses of the small equilateral triangle, the left tangent plane of the triangular prism and the left tangent plane of the special-shaped prism I are on the same plane, and the right tangent plane of the triangular prism and the right tangent plane of the special-shaped prism I are also on the same plane;
two movable supporting pads respectively clung to two tangent planes of the special-shaped prism II and a fixed supporting pad fixed on an arc surface shared by the special-shaped prism I and the special-shaped prism II are encircling between the step I and the step IV of the supporting body, and the upper surfaces of the movable supporting pad and the fixed supporting pad are arc surfaces; a groove-shaped support arm and a first-type support arm which are fixed by the axle pin of the support arm in a crossing way are arranged between the movable support pad and the support body; one end of the one-type support arm is fixed at the front end of the special-shaped pushing shaft through the special-shaped pushing shaft pin, and the other end of the one-type support arm is fixed on the movable support pad through the movable support pad shaft pin; one end of the groove-shaped support arm is fixed on the support body through a support body shaft pin fixed on a support body step III, and the other end of the groove-shaped support arm moves linearly in a groove in the movable support pad through a support pad pin;
the support connecting body sequentially comprises a fairing, a front plate, a middle plate and a rear plate from front to back; the lower ends of the front plate, the middle plate and the rear plate are fixed on a bottom plate, the bottom plate is fixed on a connecting plate, and the connecting plate is fixed on a wind tunnel middle mechanism; the outer parts of the front plate, the middle plate and the rear plate are covered with U-shaped covers, and the lower ends of the U-shaped covers are covered on the wind tunnel middle mechanism; the fairing is a cone which is facing the wind tunnel to flow, the front end of the cone is provided with a hole and sleeved on the shaft sleeve and is connected with the shaft sleeve through threads until the rear end of the cone is lapped on the circumferential outer edge of the front plate, and the front plate is connected with the middle plate through an arc plate;
the central axis of the support connecting body is provided with an extension shaft and a cylinder fixed on the back of the middle plate from front to back in sequence, and the extension shaft is connected to a piston rod of the cylinder through threads and is locked on the piston rod through a locking nut; the cavity II between the front plate and the middle plate is the operation space of the lock nut; the cavity III between the middle plate and the rear plate is the installation space of the air cylinder;
the piston of the cylinder linearly reciprocates to drive the extension shaft and the special-shaped pushing shaft to linearly reciprocate, the special-shaped pushing shaft drives the one-type support arm to reciprocate, the one-type support arm drives the groove-type support arm to linearly reciprocate in the one-type groove in the movable supporting pad, the one-type support arm and the groove-type support arm form scissor-type movement in the moving process to open and retract the movable supporting pad, the cambered surface of the movable supporting pad tightly pushes against the inner wall of the separation body stage model when the movable supporting pad opens, the cambered surface of the fixed supporting pad also simultaneously pushes against the inner wall of the separation body stage model, and the separation body stage model is released when the movable supporting pad retracts.
The baffle is arranged on the support body step I, the radius of the baffle is R, and the baffle seals the front end of the three-arm support body.
The cambered surfaces of the movable supporting pad and the fixed supporting pad are provided with patterns.
The support body shaft pin, the support arm shaft pin, the support pad pin and the special-shaped pushing shaft pin are made of 42CrMo.
The groove-shaped support arm and the one-shaped support arm are made of 38CrMoAl.
The piston of cylinder both sides each open and have a air vent, inserts trachea I, trachea II in the air vent respectively, trachea I, trachea II connect the gas outlet at the solenoid valve, solenoid valve control trachea I or trachea II admit air, leads to the piston linear reciprocating motion of cylinder.
The process of carrying out the inter-stage dynamic separation wind tunnel test by using the dynamic eccentric separation device applied to the model inter-stage dynamic separation wind tunnel test is as follows: before wind tunnel test, the main body stage model is arranged on the wind tunnel back support mechanism, and the separation body stage model is arranged on the dynamic eccentric separation device applied to the model stage dynamic separation wind tunnel test. When the wind tunnel is tested, the wind tunnel is started, after the flow field of the wind tunnel is stable, the two movable supporting pads are quickly retracted, the separator stage model is separated from the main body stage model, and the separator stage model freely moves under the influence of self gravity and aerodynamic force until the separator stage model falls on the shaft sleeve.
The central axis of the dynamic eccentric separation device applied to the model interstage dynamic separation wind tunnel test is positioned below the central axis of the separator stage model, deviates from the central axis of the separator stage model, and increases the falling free travel of the separator stage model.
The dynamic eccentric separation device applied to the model inter-stage dynamic separation wind tunnel test adopts a gas driving mode, and the back-and-forth reciprocating motion of the cylinder piston rod is converted into the relative orthogonal motion of the movable support pad of the model through the three-arm support body. The two movable support pads of the three-arm support body meet the synchronous requirement on machinery, and the three-arm support body has compact structure, good stability of movement function, high separation speed and high reliability.
The dynamic eccentric separation device applied to the model interstage dynamic separation wind tunnel test can bear the airflow impact when the wind tunnel is started. When the wind tunnel is started, strong shock waves can generate strong impact on the main body stage model, the separation body stage model and the dynamic eccentric separation device in the test section. The dynamic eccentric separating device applied to the model inter-stage dynamic separating wind tunnel test has enough static friction force between the movable supporting pad, the fixed supporting pad and the inner wall of the separating body stage model, and the static friction force can ensure that the separating body stage model is kept at an initial position and effectively avoid the phenomenon that the separating body stage model is blown off. The static friction force can be realized by three ways of increasing the roughness of the cambered surfaces of the movable supporting pad and the fixed supporting pad and increasing and maintaining the air supply pressure of the air cylinder.
The dynamic eccentric separation device applied to the model inter-stage dynamic separation wind tunnel test has the advantages of high separation speed, high reliability and high use efficiency, does not interfere the process of free movement of the separated body stage model in a flow field after separation, and avoids influencing the rationality and safety evaluation of an aircraft separation scheme due to inaccurate separation track of the separated body stage model.
In summary, the dynamic eccentric separation device applied to the model inter-stage dynamic separation wind tunnel test can resist the impact of air flow, so that the main body stage model and the separator stage model keep unchanged initial positions in the air flow, the separator stage model and the main body stage model are quickly separated after receiving a separation instruction, and the separator stage model moves freely in a wind tunnel flow field until the separator stage model falls down to be successfully recovered on the device. The dynamic eccentric separation device applied to the model inter-stage dynamic separation wind tunnel test has the advantages of compact structure, reasonable layout, convenient use, high assembly precision, high separation speed, high use efficiency, good motion stability and high reliability, and compared with other model inter-stage dynamic separation modes, the dynamic eccentric separation device has the advantages of more economy, larger free stroke of falling separation body models, capability of meeting the requirement of rapid separation models in the wind tunnel model inter-stage dynamic separation test process, and popularization and application values.
Drawings
FIG. 1 is a schematic view (front view) of a dynamic eccentric separator applied to a model interstage dynamic separation wind tunnel test according to the present invention;
FIG. 2 is a schematic view (side view) of a dynamic eccentric separator device of the present invention applied to a model interstage dynamic separation wind tunnel test;
FIG. 3 is a front view of a three-arm support in the dynamic eccentric separator of the present invention applied to a model interstage dynamic separation wind tunnel test;
FIG. 4 is a diagram of the motion of a three-arm support in the dynamic eccentric separator of the present invention applied to a model interstage dynamic separation wind tunnel test;
FIG. 5 is a schematic view of the installation of the dynamic eccentric separator in a wind tunnel of the present invention applied to a model interstage dynamic separation wind tunnel test;
FIG. 6 is a schematic view of the open state of the three-arm support body in the dynamic eccentric separating device applied to the model interstage dynamic separating wind tunnel test.
In the figure, 101, rear plate 102, bottom plate 103, connecting plate 104, U-shaped cover 105, cylinder 108, intermediate plate 109, arcuate plate 110, lock nut 111, front plate 113, extension shaft 114, fairing 115, bushing 116, nut 117, set screw 118, three arm support;
201. the special-shaped pushing shaft 202, the supporting body 203, the movable supporting pad 204, the supporting body shaft pin 205, the supporting pad pin 207, the groove-shaped supporting arm 210, the special-shaped pushing shaft pin 212, the baffle 214, the movable supporting pad shaft pin 215 and the fixed supporting pad.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
As shown in fig. 1 and 2, the dynamic eccentric separating device applied to the model inter-stage dynamic separating wind tunnel test sequentially comprises a three-arm support 118, an extension shaft 113 which is wrapped in a shaft sleeve 115 and drives the three-arm support 118 to move, and a support connecting body which is connected with the shaft sleeve 115 and is fixed on a wind tunnel middle mechanism; the radius of the connecting sleeve 115 is R;
the central axis of the support body 202 of the three-arm support body 118, the central axis of the special-shaped push shaft 201 and the central axis of the lengthening shaft 113 are coaxial;
as shown in FIG. 3, the support 202 is a stepped tubular body, and the step I of the support 202 is a cylinder I with a radial section radius R1, R1 is less than or equal to R from front to back; the step II of the support body 202 is a special-shaped prism I, and a cavity I is formed between the step I of the support body 202 and the step II of the support body 202; the step III of the support 202 is a special-shaped prism II; the step IV of the support body 202 is a cylinder II with a radial section radius R, and the tail end of the support body 202 is inserted into the shaft sleeve 115 and fixed by a radial set screw 117 of the shaft sleeve 115;
the front end of the special-shaped pushing shaft 201 is a triangular prism, and the front end of the special-shaped pushing shaft 201 is positioned in a cavity I of the supporting body 202; the middle part of the special-shaped pushing shaft 201 is a cylinder III, and the cylinder III is positioned on the central axis of the supporting body 202 and reciprocates in the supporting body 202; the tail end of the special-shaped pushing shaft 201 is a cylinder IV, and the cylinder IV is inserted into the front end of the lengthening shaft 113 and is fixed at the front end of the lengthening shaft 113 through threaded connection and a nut 116;
the radial section shapes of the special-shaped prism I and the special-shaped prism II are obtained by taking a circle with the radius r and respectively drawing a small equilateral triangle and a large equilateral triangle which are parallel with each other by taking the circle center as the center; the vertex of the small equilateral triangle is positioned in the circle, the left and right hypotenuses of the small equilateral triangle and the circular arc line segments corresponding to the bottom edges are connected into a closed curve I, and the shape of the closed curve I is the radial section shape of the special-shaped prism I; the vertex of the large equilateral triangle is positioned outside the circle, the left and right hypotenuses of the large equilateral triangle and the circular arc line segments corresponding to the bottom edges are connected into a closed curve II, and the closed curve II is the radial section shape of the special-shaped prism II; the special-shaped prism I and the special-shaped prism II are provided with shared cambered surfaces, the left tangential planes of the special-shaped prism I and the special-shaped prism II are parallel, and the right tangential planes of the special-shaped prism I and the special-shaped prism II are also parallel; the cross section of the triangular prism is an isosceles triangle, the left and right hypotenuses of the isosceles triangle are respectively overlapped with the left and right hypotenuses of the small equilateral triangle, the lengths of the left and right hypotenuses of the isosceles triangle are smaller than those of the left and right hypotenuses of the small equilateral triangle, the left tangent plane of the triangular prism and the left tangent plane of the special-shaped prism I are on the same plane, and the right tangent plane of the triangular prism and the right tangent plane of the special-shaped prism I are also on the same plane;
two movable supporting pads 203 which are respectively clung to two tangent planes of the special-shaped prism II and a fixed supporting pad 215 which is fixed on an arc surface shared by the special-shaped prism I and the special-shaped prism II are surrounded between the step I and the step IV of the supporting body 202, and the upper surfaces of the movable supporting pad 203 and the fixed supporting pad 215 are arc surfaces; a groove-shaped support arm 209 and a one-shaped support arm 210 which are fixed by the support arm shaft pin 205 in a crossing way are arranged between the movable support pad 203 and the support body 202; one end of a support arm 210 is fixed at the front end of the special-shaped pushing shaft 201 through a special-shaped pushing shaft pin 211, and the other end of the support arm 210 is fixed on the movable supporting pad 203 through a movable supporting pad shaft pin 214; one end of a groove-shaped support arm 209 is fixed on the support body 202 through a support body shaft pin 204 fixed on a step III of the support body 202, and the other end of the groove-shaped support arm 209 moves linearly in a groove in the movable support pad 203 through a support pad pin 207;
the support coupling body comprises a fairing 114, a front plate 111, a middle plate 108 and a rear plate 101 from front to back in sequence; the lower ends of the front plate 111, the middle plate 108 and the rear plate 101 are fixed on the bottom plate 102, the bottom plate 102 is fixed on the connecting plate 103, and the connecting plate 103 is fixed on the wind tunnel middle mechanism; the front plate 111, the middle plate 108 and the rear plate 101 are externally covered with a U-shaped cover 104, and the lower end of the U-shaped cover 104 is covered on the wind tunnel middle mechanism; the fairing 114 is a cone which is faced to the wind tunnel to flow, the front end of the cone is provided with a hole and sleeved on the shaft sleeve 115 and is connected with the shaft sleeve 115 through threads until the rear end of the cone is lapped on the circumferential outer edge of the front plate 111, and the front plate 111 is connected with the middle plate 108 through the arc plate 109;
the central axis of the support connecting body is provided with an extension shaft 113 and an air cylinder 105 fixed on the back of the middle plate 108 from front to back in sequence, the extension shaft 113 is connected to a piston rod of the air cylinder 105 through threads and is locked on the piston rod through a locking nut 110; the cavity ii between the front plate 111 and the intermediate plate 108 is the operating space of the lock nut 110; the cavity iii between the intermediate plate 108 and the rear plate 101 is the installation space of the cylinder 105;
the piston of the cylinder 105 linearly reciprocates to drive the extension shaft 113 and the special-shaped pushing shaft 201 to linearly reciprocate, the special-shaped pushing shaft 201 drives the one-type support arm 210 to reciprocate, the one-type support arm 210 drives the groove-type support arm 209 to linearly reciprocate in a groove in the movable support pad 203, the scissor-type movement formed by the one-type support arm 210 and the groove-type support arm 209 expands and retracts the movable support pad 203 in the moving process, as shown in fig. 4, when the movable support pad 203 expands, the cambered surface of the fixed support pad 215 pushes against the inner wall of the separator stage model, and when the movable support pad 203 retracts, the cambered surface of the fixed support pad 215 pushes against the inner wall of the separator stage model.
The step I of the support body 202 is provided with a baffle 212, the radius of the baffle 212 is R, and the baffle 212 seals the front end of the three-arm support body 118.
The cambered surfaces of the movable supporting pad 203 and the fixed supporting pad 215 are provided with patterns.
The support body shaft pin 204, the support arm shaft pin 205, the support pad pin 207 and the special-shaped pushing shaft pin 211 are made of 42CrMo.
The material of the groove-shaped support arm 209 and the one-shaped support arm 210 is 38CrMoAl.
The two sides of the piston of the cylinder 105 are respectively provided with a vent hole, the vent holes are respectively internally inserted with an air pipe I and an air pipe II, the air pipe I and the air pipe II are connected with the air outlet of the electromagnetic valve, and the electromagnetic valve controls the air pipe I or the air pipe II to enter air, so that the piston of the cylinder 105 linearly reciprocates.
Example 1
The interstage dynamic separation wind tunnel test of this embodiment has two stages.
The first stage: the model support phase may also be referred to as the model to-be-separated phase. As shown in fig. 5, at this stage, the separator is fixed in the test section at a certain attack angle, the separator stage model is mounted on the dynamic eccentric separator, the central axis of the separator stage model is above the central axis of the dynamic eccentric separator, the piston rod of the cylinder 105 moves forward, the extension shaft 113 and the special-shaped pushing shaft 201 are driven to move forward, the hinge is driven to enable the two pairs of groove-shaped support arms 209 and the one-shaped support arm 210 to move in a scissor-type manner, the movable support pad 203 is opened, the two movable support pads 203 and the fixed support pad 215 bear against the inner wall of the separator stage model in three directions, the separator stage model is fastened, and when the movable support pad 203 and the fixed support pad 215 bear against the inner wall of the separator stage model, the piston rod of the cylinder 105 moves still, and the cylinder 105 continuously provides thrust. As shown in fig. 6, after the dynamic eccentric separating device fastens the separating body model, the wind tunnel airflow impact can be resisted, so that the initial position of the model separating body model and the main body model under the wind tunnel airflow impact is kept unchanged.
And a second stage: the model separation stage may also be referred to as a model separation stage. The dynamic eccentric separator instantaneously releases the separator stage model, after release, the two movable support pads 203 are quickly retracted, the process of free movement of the separator stage model in the flow field after separation is not interfered, and the separator stage model finally falls on the shaft sleeve 115 to be recovered. The two vent holes of the cylinder in the model separation stage are reversely rotated in the ventilation and exhaust modes under the action of the electromagnetic valve and the exhaust valve, the piston rod of the cylinder 105 is rapidly pushed backwards, the extension shaft 113 and the special-shaped pushing shaft 201 are driven to move backwards, the hinge is driven to enable the two pairs of groove-shaped support arms 209 and the one-shaped support arm 210 to move in a scissor-type mode, and the two movable support pads 203 are simultaneously retracted and instantaneously separated from the separator-level model.
The foregoing examples merely represent exemplary embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. The dynamic eccentric separation device applied to the model interstage dynamic separation wind tunnel test is characterized by sequentially comprising a three-arm support body (118), an extension shaft (113) which is wrapped in a shaft sleeve (115) and drives the three-arm support body (118) to move, and a support connecting body which is connected with the shaft sleeve (115) and is fixed on a wind tunnel middle mechanism from front to back; the radius of the connecting shaft sleeve (115) is R;
the central axis of the support body (202) of the three-arm support body (118), the central axis of the special-shaped pushing shaft (201) and the central axis of the lengthening shaft (113) are coaxial;
the support body (202) is a step tubular body, and a step I of the support body (202) is a cylinder I with a radial section radius R1 from front to back, wherein R1 is less than or equal to R; the step II of the support body (202) is a special-shaped prism I, and a cavity I is formed between the step I of the support body (202) and the step II of the support body (202); the step III of the support body (202) is a special-shaped prism II; the step IV of the support body (202) is a cylinder II with a radial section radius R, and the tail end of the support body (202) is inserted into the shaft sleeve (115) and fixed by a radial set screw (117) of the shaft sleeve (115);
the front end of the special-shaped pushing shaft (201) is a triangular prism, and the front end of the special-shaped pushing shaft (201) is positioned in a cavity I of the supporting body (202); the middle part of the special-shaped pushing shaft (201) is a cylinder III, and the cylinder III is positioned on the central axis of the supporting body (202) and reciprocates in the supporting body (202); the tail end of the special-shaped pushing shaft (201) is a cylinder IV, and the cylinder IV is inserted into the front end of the lengthening shaft (113) and is fixed at the front end of the lengthening shaft (113) through threaded connection and nuts (116);
the radial section shapes of the special-shaped prism I and the special-shaped prism II are obtained by taking a circle with the radius r and respectively drawing a small equilateral triangle and a large equilateral triangle which are parallel with each other by taking the circle center as the center; the vertex of the small equilateral triangle is positioned in the circle, the left and right hypotenuses of the small equilateral triangle and the circular arc line segments corresponding to the bottom edges are connected into a closed curve I, and the shape of the closed curve I is the radial section shape of the special-shaped prism I; the vertex of the large equilateral triangle is positioned outside the circle, the left and right hypotenuses of the large equilateral triangle and the circular arc line segments corresponding to the bottom edges are connected into a closed curve II, and the closed curve II is the radial section shape of the special-shaped prism II; the special-shaped prism I and the special-shaped prism II are provided with shared cambered surfaces, the left tangential planes of the special-shaped prism I and the special-shaped prism II are parallel, and the right tangential planes of the special-shaped prism I and the special-shaped prism II are also parallel; the cross section of the triangular prism is an isosceles triangle, the left and right hypotenuses of the isosceles triangle are respectively overlapped with the left and right hypotenuses of the small equilateral triangle, the lengths of the left and right hypotenuses of the isosceles triangle are smaller than those of the left and right hypotenuses of the small equilateral triangle, the left tangent plane of the triangular prism and the left tangent plane of the special-shaped prism I are on the same plane, and the right tangent plane of the triangular prism and the right tangent plane of the special-shaped prism I are also on the same plane;
two movable supporting pads (203) which are respectively clung to two tangent planes of the special-shaped prism II and a fixed supporting pad (215) which is fixed on a cambered surface shared by the special-shaped prism I and the special-shaped prism II are encircling between the step I and the step IV of the supporting body (202), and the upper surfaces of the movable supporting pad (203) and the fixed supporting pad (215) are cambered surfaces; a groove-shaped support arm (209) and a type support arm (210) which are fixed in a crossing way through a support arm shaft pin (205) are arranged between the movable support pad (203) and the support body (202); one end of a support arm (210) is fixed at the front end of the special-shaped pushing shaft (201) through a special-shaped pushing shaft pin (211), and the other end of the support arm (210) is fixed on a movable supporting pad (203) through a movable supporting pad shaft pin (214); one end of the groove-shaped support arm (209) is fixed on the support body (202) through a support body shaft pin (204) fixed on a step III of the support body (202), and the other end of the groove-shaped support arm (209) moves linearly in a groove in the movable support pad (203) through a support pad pin (207);
the support connecting body sequentially comprises a fairing (114), a front plate (111), a middle plate (108) and a rear plate (101) from front to back; the lower ends of the front plate (111), the middle plate (108) and the rear plate (101) are fixed on the bottom plate (102), the bottom plate (102) is fixed on the connecting plate (103), and the connecting plate (103) is fixed on the wind tunnel middle mechanism; the front plate (111), the middle plate (108) and the rear plate (101) are externally covered with a U-shaped cover (104), and the lower end of the U-shaped cover (104) is covered on the wind tunnel middle mechanism; the fairing (114) is a cone which is faced to the wind tunnel to flow, the front end of the cone is provided with a hole and sleeved on the shaft sleeve (115) and is connected with the shaft sleeve (115) through threads until the rear end of the cone is lapped on the circumferential outer edge of the front plate (111), and the front plate (111) is connected with the middle plate (108) through the arc-shaped plate (109);
the central axis of the support connecting body is provided with an extension shaft (113) and an air cylinder (105) fixed on the back of the middle plate (108) from front to back in sequence, and the extension shaft (113) is connected to a piston rod of the air cylinder (105) through threads and is locked on the piston rod through a locking nut (110); the cavity II between the front plate (111) and the middle plate (108) is the operation space of the lock nut (110); the cavity III between the middle plate (108) and the rear plate (101) is the installation space of the cylinder (105);
the piston of the cylinder (105) linearly reciprocates to drive the lengthening shaft (113) and the special-shaped pushing shaft (201) to linearly reciprocate, the special-shaped pushing shaft (201) drives the one-type support arm (210) to reciprocate, the one-type support arm (210) drives the groove-type support arm (209) to linearly reciprocate in a groove in the movable support pad (203), the movable support pad (203) is opened and retracted by scissors-type movement formed by the one-type support arm (210) and the groove-type support arm (209) in the moving process, the cambered surface of the movable support pad (203) is propped against the inner wall of the separation body stage model when being opened, the cambered surface of the fixed support pad (215) is propped against the inner wall of the separation body stage model at the same time, and the separation body stage model is released when the movable support pad (203) is retracted;
a baffle plate (212) is arranged on the step I of the support body (202), the radius of the baffle plate (212) is R, and the baffle plate (212) seals the front end of the three-arm support body (118);
two sides of a piston of the cylinder (105) are respectively provided with a vent hole, an air pipe I and an air pipe II are respectively inserted into the vent holes, the air pipe I and the air pipe II are connected with an air outlet of an electromagnetic valve, and the electromagnetic valve controls the air pipe I or the air pipe II to enter air, so that the piston of the cylinder (105) moves linearly and reciprocally.
2. The dynamic eccentric separating device applied to the model inter-stage dynamic separating wind tunnel test according to claim 1, wherein the cambered surfaces of the movable supporting pad (203) and the fixed supporting pad (215) are provided with patterns.
3. The dynamic eccentric separating device applied to the model interstage dynamic separation wind tunnel test according to claim 1, wherein the support body shaft pin (204), the support arm shaft pin (205), the support pad pin (207) and the special-shaped pushing shaft pin (211) are made of 42CrMo.
4. The dynamic eccentric separating device applied to the model interstage dynamic separation wind tunnel test according to claim 1, wherein the groove-shaped support arm (209) and the one-shaped support arm (210) are made of 38CrMoAl.
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