JPH0244224A - Intermittent blow off type wind tunnel tester - Google Patents

Abstract

PURPOSE:To achieve a higher measuring accuracy by a method wherein a sample model is drawn to a pod at the startup of a wind tunnel to fit a stopper ring at the tip of the pod securely into the sample model and a sting is slid ahead after the passage of an impact wave to release the fixing thereof. CONSTITUTION:A sample model 1 is drawn to a pod 2 at the startup of a wind tunnel and a stopper ring 6 at the top of the pod 2 is fitted into the sample model 1 to fix. After the passage of an impact wave, a pressure regulating valve 8 is opened with a pressure regulating valve controller 10 to send a specified high pressure air into the pod 2 from an air tank 7 and the air pushes a spindle 4 in the pod 2 so that the sample model 1 slides in a direction of the arrow (a) to release the fixing by the stopper ring 6. This can reduce a vibration load on a wind tunnel balance scale with the passage of the impact wave at the startup of the wind tunnel thereby improving a measuring accuracy.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an intermittent blow-out type wind tunnel test device that can reduce the load on a wind tunnel balance when the wind tunnel test device is activated and improve measurement accuracy during measurement. be.

[Conventional technology]

Fig. 3 is a diagram showing an example of the configuration of an intermittent blow-out type wind tunnel test device. valve, (18) is the collection cylinder, fil is the model support cylinder, and 4 is the diffusion cylinder. Figure 4 is a diagram showing the state of the measurement cylinder when conducting a wind tunnel test in the supersonic region. , (1) is the test model, (2) is the wind tunnel balance, (3) is Sting, (I21 is Po Sodo,
((3) is a strut.

During the supersonic test, the measuring section has a nozzle shape as shown in FIG. 4 due to aerodynamic requirements, and the shape is adapted to predetermined wind speed parameters. In addition, the test model (1) placed in the measurement section is the test model (1)
The aerodynamic characteristics under predetermined conditions are measured by a wind tunnel balance (2) interpolated into the .

[Problem to be solved by the invention]

When the wind tunnel is started to perform a supersonic test using an intermittent blow-out type wind tunnel test device, the pressure control valve port that sets the internal pressure of the collecting shell begins to open, and the pressure inside the collecting shell increases, causing the measurement shell ( A shock wave is generated in the nozzle section of No. 141. This shock wave becomes an unsteady flow and moves in the downstream direction inside the measurement cylinder. By the way, the test model (1) placed inside the measurement cylinder
When this unsteady shock wave passes through, the wind tunnel balance (2) undergoes rapid pressure fluctuations and is subjected to a very large vibration load. This vibration load sometimes exceeds the capacity of the wind tunnel balance (2) inserted into the test model (1), which poses the problem of damaging the wind tunnel balance (2).

Further, in order for the wind tunnel balance (2) to sufficiently withstand the vibration load, the wind tunnel balance (2) needs to have a large capacity. However, when measuring this capacity, the test model (
11, the small aerodynamic load must be measured using a wind tunnel balance with a large capacity, which poses the problem of poor measurement accuracy.

This invention was made to solve this problem, and aims to reduce the vibration load on a wind tunnel balance when a shock wave passes through when starting up a wind tunnel, and to improve measurement accuracy.

[Means to solve the problem]

The intermittent blowout wind tunnel test device according to the present invention has a stopper ring attached to the tip of the pod of the model angle changer, and
By incorporating a piston into the pod and feeding high-pressure air from an air tank installed outside, the sting that supports the test model and wind tunnel balance can slide back and forth within the pod.

[For production]

In this invention, when the wind tunnel is started, the test model is pulled to the pod, and the stopper ring at the tip of the pod is fitted into the test model, thereby fixing the test model and reducing the vibrations applied to the wind tunnel balance when the shock wave passes through. After the shock wave has passed, high-pressure air is sent into the bond from an external air tank, the sting is slid forward, and the test model is released from its fixation, allowing regular measurements to be taken.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention. In FIG. 1, (1) is a test model, (2) is a wind tunnel balance, and (3) is a test model.
) is Sting, (4) is Piston, (5) is 0 ring, (6) is Stopper ring, (7) is Air tank, (8
) is the pressure XFJ valve, (9) is the air piping, and the shout is the pressure wJ
Valve regulating control device, (t21 is the signal cable, (t21 is the pod, (the question is the strut 1-). As shown in Figure 1, the tip of the pod (2) is equipped with the test model (1) A stopper ring (6) with an outer diameter equal to the inner diameter is attached, a piston (4) is installed in the pod, and a sting (3) supporting the test model (11) and the wind tunnel balance (2) is attached to the piston (4). connected.

In addition, an air tank (7) is provided on the outside, and high pressure air can be sent into the pond (4) through the air piping (9). The amount is controlled by a pressure W regulating valve (8) and a pressure regulating valve control device O1.

On the other hand, an O-ring (5) is attached to the piston (4) to maintain airtightness within the pound (4).

FIG. 2 is a diagram showing the operation of the present invention. In the intermittent blowing wind tunnel test device configured as described above, when the wind tunnel is started, the test model (1) is placed in the pod as shown in FIG. tc! Pull the pod (■) to the test model (11) and insert the stopper ring (6) at the tip into the test model (11).
) to be fixed. After the shock wave has passed, the pressure regulating valve control device opens the pressure regulating valve (8) and sends a predetermined amount of high-pressure air from the air tank (7) into the pod (2). The inner piston (4) is pushed and the test model (1) slides in the direction of arrow (A), and the fixation by the stopper ring (6) is released.

As mentioned above, when the shock wave passes when starting the wind tunnel, the test model is drawn to the pod and fixed using a stopper ring, thereby reducing the vibration load applied to the wind tunnel balance inserted in the test model when the shock wave passes. It can be reduced.

〔Effect of the invention〕

As explained above, this invention draws the test model to the pod and fixes the test model when the shock wave passes through when starting the wind tunnel, so that when the shock wave passes, the wind tunnel balance inserted into the test model It becomes possible to reduce the applied vibration load, which has the effect of preventing W4 scratches on the wind tunnel balance. Furthermore, there is no need to use a wind tunnel balance with a large capacity that can withstand the vibration load, and there is an effect that the accuracy of measurement by a total of 11 m can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the present invention, FIG. 2 is a diagram showing the operation of the present invention, FIG. 3 is a diagram showing an example of the configuration of an intermittent blow-out type wind tunnel test device, and FIG. It is a diagram showing the state of the measurement cylinder when conducting a supersonic test, in which (1) is the test model, (2) is the wind tunnel balance, (3) is the sting, (4) is the piston, and (5) is the test model. (6) is the stopper ring, (7) is the air tank, (8) is the pressure regulating valve, (9) is the air piping, (3) is the pressure regulating valve restriction device, (Ill is the signal cable, (( 2) is pod, (agony is strut, (I4
1 is the measurement cylinder, (formerly the air storage tank, round) is the main valve, (r71 is the pressure control valve, f18+ is the collection cylinder, Ol is the model support cylinder, (4
) is a diffusion cylinder. In addition, it is shown. In the figures, the same symbols indicate the same or equivalent parts.

Claims (1)

[Claims] In an intermittent blow-out wind tunnel testing device for testing in the supersonic region using a model angle device in which a test model and a wind tunnel balance inserted into the test model are supported by a sting from behind, the model is connected to the sting. A piston built into a pod of the angle changer, an air tank that sends high-pressure air to the pod, a pressure adjustment valve that adjusts the high-pressure air sent from the air tank, and a pressure adjustment that controls the pressure adjustment valve. a valve control device; an air pipe connecting the pod, the pressure regulating valve, and the air tank; a ring provided on the outer periphery of the piston to maintain airtightness within the pod; and a ring provided at the tip of the pod and provided with the model. An intermittent blow-out type wind tunnel test device characterized by comprising a stopper ring incorporated into the angle change device.