JPH10115572A - Wind tunnel test apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain aerodynamic characteristics as for an arbitrary roll angle by single ventilation by obtaining data with a sample model rotated in a rolling direction while its elevation angle is varied by a motor in a pod. SOLUTION: When ventilation is started, a pod 13 slowly varies an elevation angle of a sample model 9 by motion of a strut 14 of a model support body 7 of a wind tunnel. The sample model 9 continues to rotate at a constant speed in a rolling direction 17 by a motor in the pod 13. If a speed of the elevation angle changing is 1 degree/sec and a speed of the roll angle changing is 360 degrees/sec, the elevation angle 16 changes by 1 degree while the roll rotates one rotation, so that picking up data in a time series can obtain aerodynamic characteristics data per degree of the elevation angle for the roll angle. After the obtained data is subjected to coordinate conversion, each aerodynamic characteristic data is interpolated by the roll angle and arranged in a format showing a change in the aerodynamic characteristics for the elevation angle per roll angle, thereby obtaining aerodynamic characteristic data on any roll angle by single ventilation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an efficient wind tunnel test using an interpolation wind tunnel balance.

[0002]

2. Description of the Related Art FIG. 5 shows an example of the configuration of an intermittent blow-out type wind tunnel test apparatus. 1 is an air storage tank for storing air, 2 is a main valve of the air storage tank, 3 is a pressure control valve, and 4 is a pressure control valve. A high-pressure pipe for flowing high-speed airflow toward the measuring cylinder, 5 is a collecting cylinder for rectifying the airflow, 6 is a measuring cylinder for measuring the aerodynamic load received by the model due to the airflow, and 7 is a model disposed in the measuring cylinder 6 8 is a diffuser. The ventilation of the intermittent blowing type wind tunnel is performed by opening the main valve 2 after the compressed air of a predetermined pressure is stored in the air storage tank 1 and controlling the pressure in the collecting cylinder 5 by the pressure control valve 3 while measuring the cylinder 6. It is implemented by sending a high-speed air flow into the inside.

FIG. 6 is a detailed view showing the vicinity of a measuring cylinder of a conventional wind tunnel test apparatus, 9 is a test model, and 10 is inserted in the model to detect the aerodynamic load received by the test model 9. In the wind tunnel balance, the test model 9 and the balance 10 are joined via a collet 11. 12 is a sting for arranging the test model 9 in the space inside the measuring cylinder 6, 13 is a sting 12
And 14 are struts for changing the angle of attack 16 of the test model 9 with respect to the high-speed airflow 15 during ventilation in a part of the model supporting cylinder 7.

In the intermittent wind tunnel, the deformation angle of the model during ventilation is two-dimensional in a vertical plane as shown in FIG. 6, and only the angle of attack 16 of the test model 8 is automatically controlled during ventilation. It is a general conventional test method to change the roll angle by changing the setting of the mounting of the test model on the balance for each air flow. If the cross-sectional area of the wind tunnel measuring section is large and the test model is large, it is conceivable to incorporate a roll deflection device inside the model. However, most high-speed wind tunnels in Japan have a measuring section within 1 m on one side. In many cases, the model cannot be large enough to incorporate the roll deflection device.

[0005] When acquiring the aerodynamic characteristics of a test model in a wind tunnel test, when conducting a test of a test model having an asymmetric shape, it is necessary to acquire data by changing the roll angle setting finely. . The same applies to a test in a high angle of attack region in which asymmetrical aerodynamic characteristics become remarkable, and several to ten to several dozen airflows are required only by the type of roll angle setting. The parameters of the wind tunnel test include a shape, a Mach number, and a wing steering angle in addition to the attitude angle. As a result, the number of times of ventilation as a whole becomes enormous.

[0006]

As described above, according to the conventional general wind tunnel test method, it is difficult to change the setting of the roll angle during ventilation. However, there was a problem that the number of times of ventilation as a whole becomes enormous.

The present invention has been made in order to solve such a problem. By rotating a model in a roll direction at a constant speed during ventilation, aerodynamic characteristics at an arbitrary roll angle can be improved by one ventilation. The purpose is to get.

[0008]

A wind tunnel test apparatus according to a first aspect of the present invention acquires data by rotating a test model in a high speed airflow in a roll direction while changing an angle of attack of the test model by a motor in a pod. is there.

A wind tunnel test apparatus according to a second aspect of the present invention
The roll angle of the test model during ventilation is detected by a potentiometer arranged in the pod.

A wind tunnel test apparatus according to a third aspect of the present invention comprises:
The structure of the test model is a double structure of the outer shell and the inner shell, and only the outer shell is rotated in the roll direction by the motor inside the model during ventilation.

A wind tunnel test apparatus according to a fourth aspect of the present invention comprises:
A motor is arranged between the collet for transmitting the load generated on the test model to the balance and the test model, and the test model is rotated in the roll direction.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a view showing Embodiment 1 of the present invention, in which FIG. 1A is a sectional view of a pod portion, and FIG. Pod 13 according to the invention
Is the servo motor 1 arranged behind the sting 12
The structure 8 rotates the sting 12 in the roll direction 17. Reference numeral 19 denotes a lead wire to a power supply of the servo motor 18. The output of the aerodynamic load of the test model sensed by the balance in front of the sting 12 is taken into the data processing computer via the lead wire 21 through the slip ring 20 arranged between the sting 12 and the servomotor 18.

A wind tunnel test using this pod is shown in FIG.
This will be described with reference to FIG. When the ventilation starts, the pod 13 gently changes the angle of attack 16 of the test model 9 by the movement of the strut 14 of the model support cylinder 7 in the wind tunnel. During this time, the test model 9 continues to rotate at a constant speed in the roll direction 17 by the motor in the pod. If the angle of attack is 1 deg / sec
c, If the roll change speed is 360 deg / sec, the angle of attack changes by 1 deg during one rotation of the roll. Therefore, if the roll angle data to be obtained is picked up in a time series, the transfer angle related to the roll angle is obtained. The aerodynamic characteristic data is obtained at every 1 degree angle.

The data thus obtained is the aerodynamic load on the balance shaft rotating with the pod. In general, aerodynamic characteristics in a wind tunnel test are represented by an airframe coordinate system in which a vertical upward direction of a test model is defined as a positive direction of a normal force. Therefore, it is necessary to convert the balance output, the amount of deflection of the sting 12, and the like from the balance coordinate system to the body coordinate system. After performing this coordinate conversion, each aerodynamic characteristic data is interpolated by the roll angle, and rearranged for each required roll angle into a format that shows the change in aerodynamic characteristics with respect to the angle of attack, so that a single ventilation Obtain aerodynamic characteristics data for all roll angles.

Embodiment 2 FIG. 2 shows a second embodiment of the present invention and is a sectional view of a pod portion. The pod of the wind tunnel test apparatus according to the present invention includes a potentiometer 22 as a means for detecting the roll angle of the test model 9.
It has. The rotation of the sting 12 is transmitted to the potentiometer 22 via the gear 23 and the potentiometer driving gear 24, and the signal of the potentiometer 22 is taken into the data processing computer together with the balance output through the lead wire 25.

Embodiment 3 FIG. 3 shows a third embodiment of the present invention and is a sectional view of a test model. The test model 9 has a double structure of an outer shell and an inner shell, and the outer shell and the inner shell are connected via a servomotor 18. The inner shell of the test model 9 is joined to the balance 10 via the collet 11 and when the motor 18 is started, the outer shell of the test model 9
6 smoothly rotates in the roll direction 17. In this embodiment, since only the outer shell of the test model 9 rotates in the roll direction, the balance 10 does not rotate in the roll direction.

Embodiment 4 FIG. 4 shows a fourth embodiment of the present invention and is a cross-sectional view of a test model. The motor 18 is held by the model, and the collet 11 holds the rotating shaft of the motor 18 and transmits the load generated on the model to the balance 10. In this embodiment, as in Embodiment 3, the balance 10
Can be rotated without rotating in the roll direction. At this time, the collet 11 is
Is transmitted to the balance 10, so that the aerodynamic load received by the test model 9 can be measured purely by the motor 1 before ventilation.
8, it is necessary to subtract the generated torque from the roll moment component of the aerodynamic load.

[0018]

According to the first aspect of the invention, the aerodynamic characteristics which can be obtained for only one kind of roll angle by one ventilation can be obtained for all roll angles by one ventilation.

According to the second aspect, in addition to the same effects as those of the first aspect, a roll angle required at the time of data processing can be detected.

Further, according to the third aspect, in addition to the same effect as the first aspect, the test model can be rotated without rotating the balance in the roll direction, so that the data processing is facilitated. In addition, since the entire length of the rotating portion is shortened, there is an effect that the displacement of the model due to the rotation is reduced.

Further, according to the fourth aspect, in addition to the same effects as those of the third aspect, the structure is simplified, which is advantageous for a small model.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a wind tunnel test apparatus according to the present invention.
FIG.

FIG. 2 is a second embodiment of the wind tunnel test apparatus according to the present invention.
FIG.

FIG. 3 is a third embodiment of the wind tunnel test apparatus according to the present invention.
FIG.

FIG. 4 is a fourth embodiment of the wind tunnel test apparatus according to the present invention.
FIG.

FIG. 5 is a diagram showing one configuration example of a wind tunnel test device.

FIG. 6 is a view showing a conventional wind tunnel test apparatus.

[Explanation of symbols]

1 storage tank, 2 way valve, 3 pressure control valve, 4 high pressure piping, 5 collecting cylinder, 6 measuring cylinder, 7 model support cylinder, 8 diffuser, 9 test model, 10 wind tunnel balance, 11 collet, 12 sting, 13 Pod, 14 strut, 15 Arrow indicating direction of high-speed airflow, 16 Arrow indicating angle of attack of test model, 17 Arrow indicating roll angle of test model, 18 Servomotor, 19 Lead wire, 20
Slip ring, 21 lead wire, 22 potentiometer, 23 gear, 24 potentiometer drive gear,
25 leads, 26 bearings.

Claims (4)

[Claims] 1. A wind tunnel balance inserted in a test sample, a sting for arranging the test model and the wind tunnel balance in an internal space of a measuring cylinder forming a part of the wind tunnel, and a sting for the wind tunnel. In a wind tunnel test apparatus equipped with a pod for supporting the model supporting cylinder forming a part and a computer for taking in the output of the balance and processing the data, the windshield is provided in the pod, and the test model is mounted on the balance and sting. A wind tunnel test apparatus, comprising: a motor for rotating in the roll direction together with the motor; and a slip ring provided between the sting and the motor, for transmitting an output from the rotating balance to the computer. . 2. The wind tunnel test apparatus according to claim 1, wherein a potentiometer for detecting a roll angle of the test model is provided inside the pod. 3. The test model has a double structure of an outer shell and an inner shell, and has a configuration in which only the outer shell rotates in the roll direction, and a roll rotation motion is generated inside the model outer shell. 2. A motor according to claim 1, further comprising:
Wind tunnel test equipment as described. 4. The test model is provided with a motor inside, the motor is configured to be rolled relatively to the balance by the motor, and further holds the rotation axis of the motor and is generated in the test model. The wind tunnel test apparatus according to claim 1, further comprising a collet for transmitting a load to the balance.