Supersonic wind tunnel flow calibration pressure measuring hose protection device

Abstract

The invention discloses a supersonic wind tunnel flow calibration pressure measuring hose protection device. In the airflow direction of a wind tunnel, the protection device is located behind a bent blade support of a wind tunnel test section and comprises an inner-layer protection mechanism and an outer-layer protection mechanism, and the inner-layer protection mechanism is integrally arranged inthe outer-layer protection mechanism; and the outer-layer protection mechanism is composed of a rear protection cover, an installation base, a front protection cover and a cover plate, and a communicating cavity is formed in the outer-layer protection mechanism and used for containing the inner-layer protection mechanism. After being bundled, pressure measuring hoses led out from a cross pressuremeasuring bent frame penetrate out of the protection device and enter a wind tunnel plenum to be connected with a wind tunnel pressure measuring system. According to the protection device, the pressure measuring hoses are protected by a metal corrugated pipe, the metal corrugated pipe moves back and forth along with the lead screw and acts together with the outer-layer protection mechanism, so that the influence and damage of supersonic airflow to the pressure measuring hoses are avoided, the pressure measuring hoses of the flow calibration mechanism is effectively protected, the problem of wiring of multiple pressure measuring pipes of a flow channel in a supersonic wind tunnel is solved, and reliable acquisition of test pressure measurement data of the supersonic wind tunnel is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a protection device for a supersonic wind tunnel flow calibration and pressure measuring hose. Background technique [0002] When calibrating the flow field in a supersonic wind tunnel, in order to measure the pressure distribution in the test section, a moving measuring mechanism is used for measurement. The moving measuring mechanism is composed of a servo motor, a transverse transmission shaft, a bevel gear pair, and a lead screw nut pair, which converts the rotational motion of the motor into the forward and backward motion of the lead screw. During the test, the mobile measuring mechanism adopts the zero-position start-up and shutdown operation mode. When the supersonic flow field is successfully established in the supersonic wind tunnel, the mobile measuring mechanism runs to the front position, and then steps back to measure the pressure at each given...

AI Technical Summary

Problems solved by technology

It is impossible for the piezometric tube to bear the aerodynamic load when blowing in a supersonic wind tunnel. During the blowing process of a supersonic wind tunnel, the piezometric tube swings with the wind, which will cause damage to the piezometric tube

[0003] In order to solve the problem that the pressure measuring tube of the moving measurement mechanism is directly exposed to the flow channel in the wind tunnel after passing through the screw during the blowing process of the supersonic wind tunnel, it is necessary to develop a special supersonic wind tunnel flow calibration pressure measuring hose protective device

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