Research progress in nozzle design for supersonic variable Mach number wind tunnel
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 su-personic variable Mach number nozzle is the core component for adjusting Mach number during wind tunnel opera-tion,and its design quality directly determines the flow field quality of the experimental section.The research prog-ress of nozzle design in supersonic variable Mach number wind tunnels both domestically and internationally in re-cent 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 ex-perimental 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 pros-pected.
variable Mach number wind tunnel nozzleflexible wallsemi-flexible wallprofile rotationasymme-tric
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