Research progress in nozzle design for supersonic variable Mach number wind tunnel

Abstract

The supersonic variable Mach number wind tunnel can operate at multiple Mach numbers during a single operation, which has unique advantages for studying supersonic maneuvering process and scramjet starting. The supersonic variable Mach number nozzle is the core component for adjusting Mach number during wind tunnel operation, and its design quality directly determines the flow field quality of the experimental section. The research progress of nozzle design in supersonic variable Mach number wind tunnels both domestically and internationally in recent years is reviewed in this paper, and four typical variable Mach number wind tunnel nozzle schemes（flexible wall, semi-flexible wall, profile rotation, asymmetric）are introduced, as well as their numerical simulation and experimental calibration results. The key considerations in the design of different variable Mach number nozzle schemes are summarized, and the application ofvariable Mach number wind tunnel nozzle in specific tests is prospected.

Keywords

• variable mach number wind tunnel nozzle
• flexible wall
• semi-flexible wall
• profile rotation
• asymmetric