CN113465867A - Single-side single-blade-grid high-speed wind tunnel gust simulation device - Google Patents
Single-side single-blade-grid high-speed wind tunnel gust simulation device Download PDFInfo
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- CN113465867A CN113465867A CN202110958085.4A CN202110958085A CN113465867A CN 113465867 A CN113465867 A CN 113465867A CN 202110958085 A CN202110958085 A CN 202110958085A CN 113465867 A CN113465867 A CN 113465867A
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a single-side single-blade-grid high-speed wind tunnel gust simulation device. The gust simulation device comprises 1 cascade which is arranged at the outlet of a wind tunnel spray pipe or the inlet of a test section, and a driving device which is arranged outside the test section and drives the cascade to do swing motion; taking the incoming flow of the high-speed wind tunnel as the front, and when the blade cascade swings in a sine curve, forming a high-speed gust flow field which changes in a sine form in an area which is 0-20% away from the side wall surface at the downstream of the test section and takes the side wall surface opposite to the blade cascade as an initial position; the blade cascade is a control surface or an airfoil surface which is symmetrical up and down, the span length is 25% -35% of the width of the test section, the root chord length is 25% -35% of the width of the test section, the span-chord ratio is 0.8-1.2, and the tip-root ratio is 0.5-1. The wing tip vortex and the tail vortex generated during the swing of the blade grid of the gust simulation device generate a high-speed gust flow field, the blade grid is small in size, the blockage degree in a high-speed wind tunnel is small, the pneumatic load is small, the generated high-speed gust flow field is high in strength, and the test requirements of gust simulation of high-speed wind tunnels with different calibers can be met.
Description
Technical Field
The invention belongs to the technical field of high-speed wind tunnel tests, and particularly relates to a single-side single-cascade high-speed wind tunnel gust simulation device.
Background
The high-speed gust that civil aircraft and cargo airplane met under high-speed cruising state is one of the important factors that influence flight safety, because flying speed is higher, the organism can receive great interference power and interference torque under the high-speed gust disturbance, bear very big unsteady load, make the stability of flight, structural strength and flight control all receive the influence, the flight in-process also can cause driver and passenger's travelling comfort to reduce because jolting that high-speed gust produced, also can disturb driver's normal operating violently jolting, lead to taking place the flight accident.
The dynamic characteristic of an aircraft in a high-speed gust environment is researched, the influence of high-speed gust on the flight process is reduced, a large amount of work is done by researchers, early researches mainly take flight tests and theoretical analysis, most of existing gust simulation devices are designed through low-speed wind tunnel tests, the high-speed wind tunnel is high in requirement on the blockage degree and large in running speed and pressure, the high-speed pneumatic load of the gust simulation devices with the same size is often multiple times of the low-speed wind tunnel pneumatic load, therefore, the gust generation device design scheme of the low-speed wind tunnel cannot be directly applied to the high-speed wind tunnel, the high-speed gust simulation device is difficult to develop, and the research on high-speed gust response and slow-down tests in the ground environment is relatively limited.
At present, it is necessary to develop a gust simulation test device suitable for a high-speed wind tunnel.
Disclosure of Invention
The invention aims to solve the technical problem of providing a single-side single-blade-grid high-speed wind tunnel gust simulation device.
The invention relates to a single-side single-cascade high-speed wind tunnel gust simulation device which is characterized by comprising 1 cascade which is arranged at the outlet of a wind tunnel spray pipe or the inlet of a test section and a driving device which is arranged outside the test section and drives the cascade to do swing motion; taking the incoming flow of the high-speed wind tunnel as the front, and when the blade cascade swings in a sine curve, forming a high-speed gust flow field which changes in a sine form in an area which is 0-20% away from the side wall surface at the downstream of the test section and takes the side wall surface opposite to the blade cascade as an initial position;
the cascade is a control surface or an airfoil surface which is symmetrical up and down, the span length is 25% -35% of the width of the wind tunnel test section, the root chord length is 25% -35% of the width of the wind tunnel test section, the span-chord ratio is 0.8-1.2, and the tip-root ratio is 0.5-1.
Furthermore, the gust simulation device is suitable for a temporary impulse type high-speed wind tunnel or a continuous type high-speed wind tunnel, and the incoming flow Mach number range is 0.4-0.95.
Furthermore, the swing angle of the blade cascade is 0-15 degrees.
Furthermore, the oscillating frequency of the blade cascade is 0-25 Hz.
Furthermore, the symmetrical plane of the blade cascade at the attack angle of 0 degree is superposed with the horizontal symmetrical plane of the wind tunnel test section.
Furthermore, the driving device comprises a mounting substrate fixed on the outer side wall of the test section, and a motor mounting seat and a sleeve rotating shaft mounting seat are fixed on the mounting substrate;
the driving motor is fixed on the motor mounting seat, an output shaft of the driving motor is connected with the front end face of the crank connecting shaft through the coupler and the ball bearing, an angle cushion block is mounted on the rear end face of the crank connecting shaft, the angle cushion block, the slider connecting seat and the slider are sequentially connected, the slider is clamped on a track of the guide rail rocker arm, the slider is rotatably connected with the slider connecting seat, and the slider is slidably connected with the guide rail rocker arm; the swing end of the guide rail rocker arm is fixedly connected with the middle part of the sleeve rotating shaft through a screw, and the front end and the rear end of the sleeve rotating shaft are connected with the sleeve rotating shaft mounting seat through bearings respectively embedded into the front end surface and the rear end surface of the sleeve rotating shaft mounting seat; the long transmission shaft is coaxial with the sleeve rotating shaft and is arranged on the central axis of the sleeve rotating shaft, the rear end of the long transmission shaft is fixed through an expansion sleeve, the expansion sleeve is arranged in a cavity at the rear end of the sleeve rotating shaft, and the front end of the long transmission shaft penetrates through the swinging end of the guide rail rocker arm and is fixedly connected with the cascade; the driving motor drives the crank connecting shaft to continuously rotate, the sliding block is driven to slide back and forth along the track of the guide rail rocker arm, the swinging end of the guide rail rocker arm swings, and the swinging end of the guide rail rocker arm drives the long transmission shaft, the blade grid interface and the blade grid to synchronously swing through the sleeve rotating shaft and the expansion sleeve, so that the unidirectional rotation of the driving motor is converted into the swinging of the blade grid;
the encoder mounting seat is fixed on the sleeve rotating shaft mounting seat, an input shaft of the encoder is inserted into a center counter bore at the rear end of the long transmission shaft, and the encoder swings along with the blade cascade through the long transmission shaft to measure the swing angle of the blade cascade in real time.
Furthermore, the long transmission shaft is replaced by a rod balance, the rod balance and the blade grid synchronously swing, and aerodynamic force and aerodynamic moment of the blade grid at different swing angles are measured.
Furthermore, the angle cushion block comprises a series of angle cushion blocks with different angles, and the angle cushion blocks adjust the distance between the crank connecting shaft and the sliding block; the angle of each angle cushion block is the maximum swing angle of the blade cascade after the angle cushion block is installed.
Furthermore, a central conical hole is formed in the sliding block connecting seat, a conical ball bearing matched with the central conical hole is arranged on the sliding block, and the sliding block connecting seat is rotatably connected with the sliding block in a conical hole matching mode.
The single-blade-grid high-speed wind tunnel gust simulation device generates a high-speed gust flow field by using wing tip vortexes and tail vortexes generated during blade grid swinging; compared with the commonly used wing surfaces of low-speed wind tunnels, the wing cascade is small in size, small in blocking degree in the high-speed wind tunnel, small in pneumatic load borne by the same swing angle, high in strength of a generated gust flow field, suitable for carrying out half-mode high-speed gust response and slow-down tests of aircrafts supported by side walls, and capable of meeting test requirements of gust simulation of high-speed wind tunnels with different calibers.
Drawings
FIG. 1 is a schematic view (a perspective view) of the installation of a single-sided single-cascade high-speed wind tunnel gust simulation device in a 0.6 m hypersonic wind tunnel;
FIG. 2 is a schematic view (front view) of the installation of the single-sided single-cascade high-speed wind tunnel gust simulation device in a 0.6 m hypersonic wind tunnel;
FIG. 3 is a schematic view (side view) of the installation of the single-sided single-cascade high-speed wind tunnel gust simulation device in a 0.6 m hypersonic wind tunnel;
FIG. 4 is a schematic view (cross-sectional top view) of the single-side single-cascade high-speed wind tunnel gust simulation apparatus of the present invention installed in a 0.6 m hypersonic wind tunnel;
FIG. 5 is a coordinate system definition of the single-sided single-cascade high-speed wind tunnel gust simulation apparatus of the present invention in a wind tunnel;
FIG. 6 is a curve of longitudinal air flow deflection angles at different Z-direction positions of the single-side single-cascade high-speed wind tunnel gust simulation device of the present invention with time;
FIG. 7 is a curve of longitudinal air flow deflection angles at different Y-direction positions of the single-side single-cascade high-speed wind tunnel gust simulation device of the present invention changing with time;
FIG. 8 is a longitudinal airflow declination peak value spatial distribution diagram of the single-sided single-cascade high-speed wind tunnel gust simulation apparatus of the present invention;
FIG. 9 is a schematic view (perspective view) of a driving device in the single-sided single-cascade high-speed wind tunnel gust simulation device of the present invention;
FIG. 10 is a schematic diagram (exploded view) of a driving device in the single-side single-cascade high-speed wind tunnel gust simulation device of the present invention;
FIG. 11 is a schematic view of a driving device (crank connecting shaft) in the single-side single-cascade high-speed wind tunnel gust simulation device of the present invention;
FIG. 12 is a schematic view (3-degree angle cushion block) of a driving device in the single-side single-cascade high-speed wind tunnel gust simulation device of the present invention;
FIG. 13 is a schematic view (12-degree angle cushion block) of a driving device in the single-side single-cascade high-speed wind tunnel gust simulation device of the present invention;
FIG. 14 is a working principle diagram of a driving device in the single-side single-cascade high-speed wind tunnel gust simulation device of the present invention.
In the figure, 1. a driving motor; 2. a coupling; 3. a ball bearing; 4. a crank connecting shaft; 5. an angle cushion block; 6. a slider connecting seat; 7. a slider; 8. a guide rail rocker arm; 9. a long transmission shaft; 10. expanding the sleeve; 11. a sleeve shaft; 12. a bearing; 13. an encoder mounting base; 14. an encoder; 15. a mounting substrate; 16. a cascade interface; 17. a cascade of blades; 18. a motor mounting seat; 19. sleeve pivot mount pad.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The single-side single-cascade high-speed wind tunnel gust simulation device comprises 1 cascade 17 arranged at the outlet of a wind tunnel spray pipe or the inlet of a test section, and a driving device arranged outside the test section and used for driving the cascade 17 to swing; taking the incoming flow of the high-speed wind tunnel as the front, and when the blade cascade 17 swings in a sine curve, forming a high-speed gust flow field which changes in a sine form in an area which is 0-20% away from the side wall surface at the downstream of the test section and takes the side wall surface opposite to the blade cascade 17 as an initial position;
the cascade 17 is a control surface or a wing surface which is symmetrical up and down, the span length is 25% -35% of the width of the wind tunnel test section, the root chord length is 25% -35% of the width of the wind tunnel test section, the span-chord ratio is 0.8-1.2, and the tip-root ratio is 0.5-1.
Furthermore, the gust simulation device is suitable for a temporary impulse type high-speed wind tunnel or a continuous type high-speed wind tunnel, and the incoming flow Mach number range is 0.4-0.95.
Further, the swing angle of the blade cascade 17 is 0-15 degrees.
Further, the oscillating frequency of the blade cascade 17 is 0-25 Hz.
Further, the symmetrical plane of the blade cascade 17 at the attack angle of 0 degree is superposed with the horizontal symmetrical plane of the wind tunnel test section.
Further, the driving device comprises a mounting substrate 15 fixed on the outer side wall of the test section, and a motor mounting seat 18 and a sleeve rotating shaft mounting seat 19 are fixed on the mounting substrate 15;
the driving motor 1 is fixed on a motor mounting seat 18, an output shaft of the driving motor 1 is connected with the front end face of a crank connecting shaft 4 through a coupler 2 and a ball bearing 3, an angle cushion block 5 is mounted on the rear end face of the crank connecting shaft 4, the angle cushion block 5, a slider connecting seat 6 and a slider 7 are sequentially connected, the slider 7 is clamped on a track of a guide rail rocker arm 8, the slider 7 is rotatably connected with the slider connecting seat 6, and the slider 7 is slidably connected with the guide rail rocker arm 8; the swing end of the guide rail rocker arm 8 is fixedly connected with the middle part of the sleeve rotating shaft 11 through a screw, and the front end and the rear end of the sleeve rotating shaft 11 are connected with the sleeve rotating shaft mounting seat 19 through bearings 12 respectively embedded into the front end surface and the rear end surface of the sleeve rotating shaft mounting seat 19; the long transmission shaft 9 is coaxial with the sleeve rotating shaft 11 and is arranged on the central axis of the sleeve rotating shaft 11, the rear end of the long transmission shaft 9 is fixed through an expansion sleeve 10, the expansion sleeve 10 is arranged in a rear end cavity of the sleeve rotating shaft 11, and the front end of the long transmission shaft 9 penetrates through the swinging end of the guide rail rocker arm 8 and is fixedly connected with the blade cascade 17; the driving motor 1 drives the crank connecting shaft 4 to rotate continuously, the sliding block 7 is driven to slide back and forth along the track of the guide rail rocker arm 8, the swinging end of the guide rail rocker arm 8 swings, the swinging end of the guide rail rocker arm 8 drives the long transmission shaft 9, the blade cascade interface 16 and the blade cascade 17 to swing synchronously through the sleeve rotating shaft 11 and the expansion sleeve 10, and the unidirectional rotation of the driving motor 1 is converted into the swinging of the blade cascade 17;
the encoder mounting base 13 is fixed on the sleeve rotating shaft mounting base 19, an input shaft of the encoder 14 is inserted into a central counter bore at the rear end of the long transmission shaft 9, the encoder 14 swings along with the blade cascade 17 through the long transmission shaft 9, and the swing angle of the blade cascade 17 is measured in real time.
Further, the long transmission shaft 9 is replaced by a rod balance, the rod balance and the blade grid 17 synchronously swing, and aerodynamic force and aerodynamic moment of the blade grid 17 at different swing angles are measured.
Further, the angle cushion block 5 comprises a series of angle cushion blocks 5 with different angles, and the angle cushion blocks 5 adjust the distance between the crank connecting shaft 4 and the sliding block 7; the angle of each angle block 5 is the maximum pivot angle of the blade cascade 17 after the angle block 5 is installed.
Furthermore, a central conical hole is formed in the slider connecting seat 6, a conical ball bearing matched with the central conical hole is arranged on the slider 7, and the slider connecting seat 6 is rotatably connected with the slider 7 in a conical hole matching mode.
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
The embodiment is a specific application of the single-side single-cascade high-speed wind tunnel gust simulation device in a 0.6-meter three-sound-velocity wind tunnel.
Fig. 1-4 are schematic views of the installation of the single-side single-cascade high-speed wind tunnel gust simulation device in a 0.6-meter three-sound-speed wind tunnel, taking the incoming flow of the high-speed wind tunnel as the front, during the test, the cascade 17 is installed on the left side of the inlet of the wind tunnel test section, and the flow field calibration device or the test model is installed in the flow field uniform area behind the gust simulation device. The section of the blade cascade 17 is an NACA0012 airfoil, the chord length of the root is 200mm, the span length is 200mm, the tip-root ratio is 0.5, and the central shaft of the sleeve rotating shaft 11 is located at 25% of the chord length of the blade cascade 17.
Fig. 5 is a coordinate system definition of the single-side single-cascade high-speed wind tunnel gust simulation device in the wind tunnel, the root front edge of the cascade 17 at an attack angle of 0 degree is taken as an original point O, the X-axis direction points to the wind tunnel incoming flow direction, the Y-axis and the side wall of the test section are parallel and point upwards, and the Z-axis points to the right. Under the definition of the coordinate system, the strength of the high-speed gust flow field in the test section adopts a longitudinal air flow deflection angle agRepresents:
αg＝arctan(VY/VX) (1)
in the formula, VXIs the speed of the air flow in the X direction, VYIs the Y direction air flow velocity.
Fig. 6 shows a curve of longitudinal airflow incidence angles of two monitoring points with time, where coordinates in a horizontal symmetrical plane of a test section are (0.9m, 0m, 0.48m) and (0.9m, 0m, 0.54m) respectively when a wind tunnel incoming flow mach number is 0.6, a blade cascade 17 swings at a swing amplitude of 12 ° and a frequency of 10Hz, and it can be seen from the figure that the longitudinal airflow incidence angles of the two monitoring points change regularly in a sine curve with time and the frequency is 10Hz, and the difference between the longitudinal airflow incidence angles of the two monitoring points at the same time is not large, which indicates that the uniformity of a gust flow field in the area range along the Z-axis direction is good.
Fig. 7 is a graph showing the variation of the longitudinal airflow incidence angles with time of three monitoring points, where the mach number of the wind tunnel incoming flow is 0.6, the coordinates of the test section when the blade cascade 17 swings at the swing amplitude of 12 ° and the frequency of 10Hz are respectively (0.9m, -0.04m, 0.48m), (0.9m, 0m, 0.48m) and (0.9m, 0.04m, 0.48m), and it can be seen from the graph that the longitudinal airflow deflection angles of the three monitoring points change with time in a sine curve rule, the frequency is 10Hz, and the difference of the longitudinal airflow deflection angles of the three monitoring points at the same time is not large, which indicates that the uniformity of the gust flow field in the area along the Y-axis direction is good.
Fig. 8 shows the peak value spatial distribution of the gust flow field of the transverse symmetric surface of the wind tunnel when the wind tunnel incoming flow mach number is 0.6, the blade cascade 17 swings at the swing amplitude of 12 ° and the frequency of 10Hz, and it can be seen from the figure that the high-speed gust flow field changes smoothly within the range of 0-20% of the distance from the sidewall wall surface at the opposite side of the blade cascade, and can be used as a uniform area of the high-speed gust flow field.
Fig. 9 is an implementation form of a driving device in the single-side single-blade-grid high-speed wind tunnel gust simulation device, fig. 10 is an exploded view of the driving device, and as can be seen from fig. 9 and 10, the driving device comprises a movable part, a fixed part, a measuring device and an angle cushion block.
The movable part comprises a driving motor 1, a coupler 2, a ball bearing 3, a crank connecting shaft 4, a slider connecting seat 6, a slider 7, a guide rail rocker arm 8, a long transmission shaft 9, an expansion sleeve 10, a sleeve rotating shaft 11, a bearing 12, a cascade interface 16 and a cascade 17; the driving motor 1 is fixed on the motor mounting seat 18, the output shaft of the driving motor 1 is connected with the crank connecting shaft 4 through the shaft coupling 2 and the ball bearing 3, the crank connecting shaft 4 is fixedly connected on the sliding block 7 through the angle cushion block 5 and the sliding block connecting seat 6, and the sliding block 7 is clamped on the track of the guide rail rocker arm 8; the swing end of the guide rail rocker arm 8 is fixedly connected with the middle part of the sleeve rotating shaft 11 through a screw, and the front end and the rear end of the sleeve rotating shaft 11 are connected with the sleeve rotating shaft mounting seat 19 through bearings 12 respectively embedded into the front end surface and the rear end surface of the sleeve rotating shaft mounting seat 19; the long transmission shaft 9 is coaxial with the sleeve rotating shaft 11 and is arranged on the central axis of the sleeve rotating shaft 11, the rear end of the long transmission shaft 9 is fixed through an expansion sleeve 10, the expansion sleeve 10 is arranged in a rear end cavity of the sleeve rotating shaft 11, and the front end of the long transmission shaft 9 penetrates through the swinging end of the guide rail rocker arm 8 and is fixedly connected with a blade cascade 17 through a blade cascade interface 16; the driving motor 1 drives the crank connecting shaft 4 to rotate continuously, the sliding block 7 is driven to slide back and forth along the track of the guide rail rocker arm 8, the swinging end of the guide rail rocker arm 8 swings, the swinging end of the guide rail rocker arm 8 drives the long transmission shaft 9, the blade cascade interface 16 and the blade cascade 17 to swing synchronously through the sleeve rotating shaft 11 and the expansion sleeve 10, and the unidirectional rotation of the driving motor 1 is converted into the swinging of the blade cascade 17.
The fixed parts include an encoder mounting base 13, a mounting base plate 15, a motor mounting base 18 and a sleeve rotating shaft mounting base 19. Mounting substrate 15 is the installation basis of whole gust analogue means, installs in wind-tunnel test section lateral wall when experimental, and motor mount pad 18 is driving motor 1's installation basis, installs in mounting substrate 15 and keeps away from wind-tunnel test section entry one side, and sleeve pivot mount pad 19 is the installation basis of sleeve pivot 11 and encoder 14, installs and is close to test section entry position in mounting substrate 15 front side, and encoder mount pad 13 is then installed on sleeve pivot mount pad 19.
The measuring equipment is an encoder 14, and the encoder 14 is connected with the rear end of the long transmission shaft 9 and used for measuring the swing angle of the blade cascade 17 in real time.
The angle cushion blocks 5 comprise angle cushion blocks corresponding to the maximum swing angle of the blade cascade 17.
The driving device adopts an eccentric wheel rocking handle structure, and the continuous rotation of a driving motor 1 is converted into the swinging motion of a blade cascade 17 through an eccentric wheel mechanism consisting of a crank connecting shaft 4, an angle cushion block 5 and a slide block connecting seat 6 and a slide block 7 which freely moves on a guide rail rocking arm 8. The crank connecting shaft 4 is shown in figure 11, the 3-degree angle cushion block 5 is shown in figure 12, and the 12-degree angle cushion block 5 is shown in figure 13.
The working principle of the driving device is shown in figure 14, and the central axis of the sleeve rotating shaft 11 is positioned at O1The rotating shaft of the crank connecting shaft 4 is positioned at O2Point, O1Point and O2The distance between the points is l, the central axis of the slide block 7 is positioned at an end point A, the end point A is provided with the slide block 7 which can freely slide on a guide rail rocker arm 8 connected with a sleeve rotating shaft 11, and the rocking handle of the crank connecting shaft 4 is O2A, rocking handle O2The length of A is R, the R is changed by replacing the angle cushion block 5, and the rocking handle O is arranged after the driving motor 1 works2A surrounds O at a constant angular velocity ω2The point rotates. Suppose an initial time rocking handle O2A and O1O2If the included angle α of the connecting line is 0 °, the motion equation of the swing angle θ of the cascade 17 can be written as follows according to the geometric relationship:
point B in FIG. 14 is O2Point is at O1The intersection point of the vertical lines on A.
As can be seen from the above equation, after the positions of the rotating shaft of the driving motor 1 and the rotating shaft of the blade cascade 17 are fixed, the swing of the blade cascade 17 is mainly determined by the rocking handle O2The length R of a. The angular velocity of the cascade 17 can also be written by the above equation:
if l/R is sufficiently large, the above formula can be approximated as:
in this case, the blade row 17 changes approximately in a sinusoidal manner.
When the swing amplitude of the blade cascade 17 is 15 degrees, the corresponding l/R is approximately equal to 5, at the moment, the angle of the blade cascade 17 is approximately changed in a sine curve, when the swing amplitude of the blade cascade 17 is less than 15 degrees, the l/R is more than 5, the smaller the swing amplitude is, the larger the l/R is, and the closer the swing angle change curve along with time is to the sine curve.
Although the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, but it can be applied to various fields suitable for the present invention. Additional modifications and refinements of the present invention will readily occur to those skilled in the art without departing from the principles of the present invention, and therefore the present invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.
Claims (9)
1. A single-side single-cascade high-speed wind tunnel gust simulation device is characterized by comprising 1 cascade (17) arranged at the outlet of a wind tunnel spray pipe or the inlet of a test section and a driving device arranged outside the test section and used for driving the cascade (17) to swing; taking the incoming flow of the high-speed wind tunnel as the front, and when the blade cascade (17) swings in a sine curve, forming a high-speed gust flow field which changes in a sine form in an area which is at the downstream of the test section and is 0-20% away from the side wall surface by taking the side wall surface opposite to the blade cascade (17) as an initial position;
the cascade (17) is a control surface or a wing surface which is symmetrical up and down, the span length is 25% -35% of the width of the wind tunnel test section, the root chord length is 25% -35% of the width of the wind tunnel test section, the span-chord ratio is 0.8-1.2, and the tip-root ratio is 0.5-1.
2. The unilateral single-cascade high-speed wind tunnel gust simulation device according to claim 1, wherein the gust simulation device is suitable for a temporary impulse type high-speed wind tunnel or a continuous type high-speed wind tunnel, and the incoming flow Mach number range is 0.4-0.95.
3. The unilateral single-cascade high-speed wind tunnel gust simulation device according to claim 1, wherein the swing angle of the cascade (17) is 0-15 °.
4. The unilateral single-cascade high-speed wind tunnel gust simulation device according to claim 1, wherein the oscillating frequency of the cascade (17) is 0-25 Hz.
5. The unilateral single-cascade high-speed wind tunnel gust simulation device according to claim 1, wherein the cascade (17) is coincident with a horizontal symmetry plane of the wind tunnel test section on a symmetry plane with an attack angle of 0 °.
6. The single-sided single-cascade high-speed wind tunnel gust simulation device of claim 1, wherein the driving device comprises a mounting substrate (15) fixed on the outer side wall of the test section, and a motor mounting seat (18) and a sleeve rotating shaft mounting seat (19) are fixed on the mounting substrate (15);
the driving motor (1) is fixed on a motor mounting seat (18), an output shaft of the driving motor (1) is connected with the front end face of a crank connecting shaft (4) through a coupler (2) and a ball bearing (3), an angle cushion block (5) is installed on the rear end face of the crank connecting shaft (4), the angle cushion block (5), a slider connecting seat (6) and a slider (7) are sequentially connected, the slider (7) is installed and clamped on a track of a guide rail rocker arm (8), the slider (7) is rotationally connected with the slider connecting seat (6), and the slider (7) is slidably connected with the guide rail rocker arm (8); the swing end of the guide rail rocker arm (8) is fixedly connected with the middle part of the sleeve rotating shaft (11) through a screw, and the front end and the rear end of the sleeve rotating shaft (11) are connected with the sleeve rotating shaft mounting seat (19) through bearings (12) respectively embedded into the front end surface and the rear end surface of the sleeve rotating shaft mounting seat (19); the long transmission shaft (9) is coaxial with the sleeve rotating shaft (11) and is arranged on the central axis of the sleeve rotating shaft (11), the rear end of the long transmission shaft (9) is fixed through an expansion sleeve (10), the expansion sleeve (10) is arranged in a cavity at the rear end of the sleeve rotating shaft (11), and the front end of the long transmission shaft (9) penetrates through the swinging end of the guide rail rocker arm (8) to be fixedly connected with the cascade (17); the driving motor (1) drives the crank connecting shaft (4) to rotate continuously, the sliding block (7) is driven to slide back and forth along the track of the guide rail rocker arm (8), the swinging end of the guide rail rocker arm (8) swings, the swinging end of the guide rail rocker arm (8) drives the long transmission shaft (9), the blade cascade connector (16) and the blade cascade (17) to swing synchronously through the sleeve rotating shaft (11) and the expansion sleeve (10), and the unidirectional rotation of the driving motor (1) is converted into the swinging of the blade cascade (17);
the encoder mounting seat (13) is fixed on the sleeve rotating shaft mounting seat (19), an input shaft of the encoder (14) is inserted into a center counter bore at the rear end of the long transmission shaft (9), the encoder (14) swings along with the blade cascade (17) through the long transmission shaft (9), and the swing angle of the blade cascade (17) is measured in real time.
7. The unilateral single-cascade high-speed wind tunnel gust simulation device according to claim 6, wherein the long transmission shaft (9) is replaced by a rod balance, the rod balance and the cascade (17) synchronously swing, and aerodynamic force and aerodynamic moment of the cascade (17) at different swing angles are measured.
8. The unilateral single-cascade high-speed wind tunnel gust simulation device according to claim 6, wherein the angle block (5) comprises a series of angle blocks (5) with different angles, and the angle blocks (5) adjust the distance between the crank connecting shaft (4) and the sliding block (7); the angle of each angle cushion block (5) is the maximum swing angle of the blade cascade (17) after the angle cushion block (5) is installed.
9. The unilateral single-cascade high-speed wind tunnel gust simulation device according to claim 6, wherein the slider connecting seat (6) is provided with a central conical hole, the slider (7) is provided with a conical ball bearing matched with the central conical hole, and the slider connecting seat (6) and the slider (7) are rotatably connected in a conical hole matching manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110958085.4A CN113465867B (en) | 2021-08-20 | 2021-08-20 | Single-side single-blade-grid high-speed wind tunnel gust simulation device |
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| CN114397085A (en) * | 2022-01-26 | 2022-04-26 | 北京航空航天大学 | Vertical flow direction coupling type gust generating system |
| CN114608783A (en) * | 2022-03-11 | 2022-06-10 | 西北工业大学 | Wind tunnel installation structure for sectional type mixed scaling airfoil |
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| CN114397085A (en) * | 2022-01-26 | 2022-04-26 | 北京航空航天大学 | Vertical flow direction coupling type gust generating system |
| CN114397085B (en) * | 2022-01-26 | 2022-12-16 | 北京航空航天大学 | Vertical flow direction coupling type gust generating system |
| CN114608783A (en) * | 2022-03-11 | 2022-06-10 | 西北工业大学 | Wind tunnel installation structure for sectional type mixed scaling airfoil |
| CN114608783B (en) * | 2022-03-11 | 2024-01-09 | 西北工业大学 | Wind tunnel installation structure for sectional type mixed scaling wing section |
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