Design and Flow Field Characteristics of a Combined Wide Mach Number Wind Tunnel
Pulse wind tunnels are the important experimental equipment for developing hypersonic aircraft and conducting aerodynamic thermodynamic research.Based on the combination operation principle of shock wave wind tunnel and Ludwieg tube wind tunnel,a series of key technologies are broken through such as high-temperature external static heating technology,high-temperature and high-pressure gas isolation technology,and large-diameter high-temperature diaphragm design technology.The FL-63 impulse combined wide Mach number wind tunnel is designed and constructed,with a design Mach number range of 3.0 to 10.0,and adopts a combined operation mode.In the low Mach number range(Mach numbers 3.0～4.5),it adopts Ludwieg tube wind tunnel operation mode,with a maximum temperature of up to 900K,and can reproduce the total enthalpy and total pressure at flight altitude,with an effective operating time greater than 150ms;In the high Mach number range(Mach numbers 5.0～10.0),it adopts a shock tunnel operating mode,with an effective operating time greater than 20ms and a maximum driving pressure of 30MPa.By combining the operation modes and taking into account the different simulation requirements of low and high Mach number flow,the experimental capability of a wide Mach number range achieved.
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