A device and method for cutting off non-effective test airflow in a shock tunnel

Abstract

The invention discloses a device and method for cutting off ineffective test air flow in a shock wave wind tunnel. The device adds a central valve body with a delay function in the conventional shock wave wind tunnel. The central valve body is installed in the rear section of the driven section and in front of the nozzle inlet. The effective test gas flow of the central valve body is not in the driven section. It is in the open state before the end, and when the effective test gas flows out and the test data collection is completed, the central valve body moves to the closed state. The method can seal the high-pressure driving gas in the driving section in the shock tube through the movement of the central valve body, cut off the non-effective test air flow from entering the test section, and prevent the scouring damage of the test model sensor caused by a large amount of residual gas entering the test section.

Description

technical field [0001] The invention belongs to the technical field of shock wave wind tunnels, and in particular relates to a device and method for cutting off ineffective test air flow in shock wave wind tunnels. Background technique [0002] The shock tunnel / shock tube is a test device that generates high temperature and high pressure airflow. Because the shock tube can easily heat, pressurize and accelerate the gas to a very high parameter, it is widely used in aerospace, aviation, explosion engineering, chemistry and physics and other fields. [0003] The shock tube of a conventional shock tunnel consists of two sections, separated by a main diaphragm, and the two sides of the main diaphragm are filled with gases of different pressures; the front section with higher pressure is called the high pressure section, also known as It is the driving section, and the driving section is filled with high-pressure driving gas; the latter section with lower pressure is called the ...

AI Technical Summary

Problems solved by technology

Generally speaking, the pressure of the high-pressure driving gas is tens or even hundreds of times that of the low-pressure test gas, and a large amount of high-pressure driving gas entering the test section can easily cause erosion damage to the test model sensor

Images