A diaphragm-less shock tunnel throat device and its test method

Abstract

The invention discloses a diaphragm-less shock wave wind tunnel throat device and a test method thereof. The throat device includes a driven section, a piston supporting section and a throat section; a piston ring is arranged in the piston supporting section, and the piston ring moves back and forth to form a moving cavity; The air passage hole is equipped with a head at the front end, and the head and the piston ring form a ball head cone surface line sealing structure. There are also air-filling holes and breathing holes communicating with the moving cavity on the throat section. During the test, the high-pressure test gas pushes the piston ring to move backward, and the gas in the moving cavity is discharged through the breathing hole. The piston ring hits the front end of the throat section, and the sealing structure between the piston ring and the ball head cone of the head fails. The test gas enters the throat of the shock tunnel through the air inlet hole. The throat device and test method are simple, reliable, high in test efficiency, and have little damage to the test model and the test sensor on the test model.

Description

Technical field [0001] The present invention belongs to the field of exchanging wind tunnel, and in particular to a diaphragmous excipient wind tunnel throat device and a test method thereof. Background technique [0002] The reflective exciting wind hole is a pulse type wind hole that produces a high ultrasound speed test gas flow using a huper compression test gas. The reflective exciting wind hole is composed of a sequentially connected drive section, a driver section, a throat, a nozzle, a test section, and the like, wherein the drive section is separated from the drive section, the second diaphragm. The drive section is charged with the throat, and the driving segment is charged into the high pressure drive gas, and the test gas is filled in the test gas, the nozzle and test section of the driver, located within the test section. [0003] When the reflective excursable wind turbine is running, the main membrane is instantially broken, and the incident excitement of the downs...

AI Technical Summary

Problems solved by technology

[0004] During the instantaneous cracking process of the main diaphragm and the secondary diaphragm and after they are opened, under the action of airflow pressure, slag or even flaps are prone to drop off, and the diaphragm residue moves downstream with the airflow at high speed, which can easily cause damage to the throat and the test model. damage

In addition, the high-temperature, high-pressure, and stagnant effective test gas generated at the inlet of the reflective shock tunnel nozzle lasts for a short time. After the effective test time, the driving gas flowing into the nozzle has a higher pressure and a longer duration. The test sensor on the model caused a long washout, shortening the life of the test sensor

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