Supersonic velocity continuous variable mach number spray pipe based on center body

Abstract

The invention discloses a supersonic velocity continuous variable mach number spray pipe based on a center body. The spray pipe is a spray pipe box body, the upper surface of the spray pipe box body is a two-dimensional molded surface I, and the lower surface of the spray pipe box body is a symmetrical two-dimensional molded surface II. The center body is arranged on the center line of the box body and is symmetrical up and down, sliding grooves are formed at the left side and the right side of the center body, and the correspondingly-matched sliding rails are installed at the left side and the right side of the spray pipe box body. The center body can move forwards and backwards on the center line of the spray pipe box body through the cooperation of the sliding grooves and the sliding rails, a moving control mechanism is arranged outside the spray pipe box body to control the moving position and the moving speed of the center body, and sealing shrouds are arranged on the front end face and the rear end face of the spray pipe box body. The spray pipe adopts a sliding center body spray pipe technology, the Mach number of a wind tunnel can be changed from 2.0 to 3.5 or from 3.5 to 2.0 within 3 seconds, so that the high-speed wind tunnel can be ensured to have good flow field quality, and a reliable technical means is provided for the performance assessment and evaluation of an air inlet channel under the supersonic speed Mach number changing condition.

Description

technical field [0001] The invention belongs to the technical field of high-speed wind tunnel tests, and in particular relates to a supersonic continuously variable Mach number nozzle based on a central body. Background technique [0002] In the development process of high-speed aircraft, higher requirements are put forward for the performance assessment and evaluation of the inlet under the condition of supersonic continuously variable Mach number. It is hoped that the ground simulation equipment can provide relevant test data. [0003] Most of the supersonic continuous variable Mach number test techniques in high-speed wind tunnels adopt the form of soft-wall nozzles, that is, during the test process, the hydraulic-electrical system controls the actuator to deform the wall plate to realize the change of Mach number. In this way, due to the long time required for the deformation control of the wall plate, it takes at least tens of seconds or several minutes to change the sm...

AI Technical Summary

Problems solved by technology

However, due to the asymmetry of the upper and lower walls of the nozzle, this technology has problems such as large airflow deflection angle, velocity stratification, and poor Mach number uniformity in the flow field. Therefore, it is impossible to finely evaluate the performance of the inlet under variable speed conditions.

Images