Spray pipe section structure and method for realizing continuous variable mach number wind tunnel

Abstract

The invention provides a spray pipe section structure and method for realizing a continuous variable mach number wind tunnel. The spray pipe section structure comprises a protective shell, a spray pipe section upper wall face, a spray pipe section lower wall face, a spray pipe section side wall, a rotary spray pipe, a rotary shaft, a driving device and a transmission force arm. The positions of the spray pipe section upper wall surface and the spray pipe section lower wall surface are fixed and are used for connecting a downstream experiment section and an upstream stable section of the spray pipe section structure. When the rotating spray pipe rotates around the rotating shaft under the transmission action of the transmission force arm and the power action of the driving device, self-adaptive backflow areas are formed at the upstream position and the downstream position of the rotating spray pipe, and the self-adaptive backflow areas are used for generating pneumatic wall faces, so that flowing in a flow field where the rotating spray pipe is located is kept smooth. The lower wall surface of the rotary spray pipe and the lower wall surface of the spray pipe section form a throat part, airflow reaches sound velocity at the throat part, and when the rotary spray pipe is rotated, the deflection angle is adjusted by changing the position of the throat part, so that the sound velocity reaches a specific Mach number based on the deflection angle, and the continuous variable Mach number wind tunnel is realized.

Description

technical field [0001] The invention relates to the field of wind tunnel structures, in particular to a nozzle section structure and method for realizing a continuously variable Mach number wind tunnel. Background technique [0002] At present, the schemes of variable Mach number wind tunnel mainly include flexible wall type and symmetrical opening and closing type. The flexible-wall variable Mach number wind tunnel scheme uses a series of pistons to move up and down to drive the nozzle wall to undergo controllable deformation, thereby changing the Mach number of the nozzle flow field. The symmetrical opening and closing type variable Mach number wind tunnel scheme adopts the upper and lower symmetrical solid-wall nozzles. The nozzle profiles take one end of the nozzle as the rotation axis, and the other end moves up and down to change the shrinkage ratio of the nozzle, thereby changing the flow field Mach of the nozzle. number. [0003] The existing variable Mach number w...

AI Technical Summary

Problems solved by technology

[0003] The existing variable Mach number wind tunnel schemes mainly have the following defects: (1) The mechanical mechanism is complex and requires multiple driving mechanisms (such as flexible wall variable Mach number nozzles); (2) The response speed of variable Mach number adjustment is limited ( For example, flexible wall variable Mach number nozzle); (3) Mach flow field offset at non-design point is relatively large (such as symmetrical opening and closing variable Mach number nozzle)

Images