Device and method for improving local vacuum degree of pulse wind tunnel

Abstract

The invention discloses a device and a method for improving the local vacuum degree of a pulse wind tunnel. The device comprises a check ring, a bottom plate, a cover plate and a diaphragm. Under thecondition that the driving pressure is not changed, the vacuumizing capacity of a test section is improved, specifically, a diaphragm partition device is installed in a straight section of a vacuum tube, the test section and a vacuum container device are separated by the diaphragm partition device, and a bypass pipeline and a bypass valve are arranged in front of and behind the diaphragm partitiondevice; when a wind tunnel test is prepared, firstly, the bypass valve is opened, the test section, the vacuum tube straight section and the vacuum container device are communicated, and a vacuum unit is started to vacuumize gas in a relatively large volume space to the required vacuum requirement. The ratio of the driving pressure to the vacuum environment pressure of the test section is greatlyimproved, so that the effect of improving the wind tunnel driving capacity is achieved, and the problem that the arrangement of an existing vacuum unit and test section, a vacuum tube straight section and a vacuum container device cannot meet the use requirements is solved.

Description

technical field [0001] The invention belongs to the field of wind tunnel equipment, and in particular relates to a device and method for improving the partial vacuum degree of a pulse wind tunnel. Background technique [0002] The pulse wind tunnel is a wind tunnel device that can generate hypersonic test airflow. In hypersonic shock wave wind tunnels and expansion tube wind tunnels and other pulsed wind tunnel equipment, the high-pressure driving gas is usually used to rupture the membrane to generate a shock wave, and the shock wave heats and boosts the test gas to form the test gas. For the test environment and test airflow, in order to further improve the driving ability, in addition to using high-pressure driving gas, it is usually necessary to evacuate the test section and increase its vacuum degree as much as possible, that is, to increase the driving pressure of the high-pressure gas in the wind tunnel and the vacuum of the test section. The ratio of pressure, it ca...

AI Technical Summary

Problems solved by technology

However, the total volume space of the test section, the straight section of the vacuum flat tube and the vacuum container device is usually large, such as 250 cubic meters. In the range from atmospheric pressure to 10Pa, the existing vacuum unit is relatively quick to pump, and thereafter from 10Pa In the process of evacuating to 1Pa or even 0.5Pa, due to the fixed and relatively large evacuation volume, the evacuation efficiency of existing vacuum units is very low. In addition, due to leakage or precipitation, it is difficult to connect the large-volume test section with the vacuum container device. Pumping up to a vacuum pressure of 1Pa, let alone a vacuum pressure of 0.5Pa and higher, therefore, for the simulation of high-state tests, the existing vacuum unit and test section, vacuum tube straight section, vacuum container device The layout cannot meet the requirements, and it is necessary to develop a driving condition or capability that meets the high state simulation of the wind tunnel

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