高温燃气流超声速风洞扩压器热防护设计

Thermal Protection Design of Diffuser for High Temperature Supersonic Combustion Tunnel

为实现高热流环境下高温燃气流超声速风洞系统的重复使用,采用数值方法对扩压器热环境进行了分析,采用沸腾换热方法对扩压器进行了热防护设计,并通过试验验证了沸腾换热理论应用的可行性。结果表明,沸腾换热在水流速2 m/s的情况下可实现热流2 MW/m2的热防护,应用沸腾换热可以有效降低设计难度,在较低的速度和压力损失下达到更好的换热效果。

To achieve the repeated use of high temperature supersonic gas tunnel suffering from high heat flux, the thermal environment of the diffuser is simulated numerically, the thermal protection is designed with the adoption of the boiling heat transfer method and is verified by experiment. The result shows that the method of boiling heat transfer can protect the diffuser from the heat flux of 2 MW/m^2 by the sub-cooled water with a velocity of 2 m/s. The application of boiling heat transfer can make the design much easier, which can achieve a better heat transfer effect at a lower speed and pressure loss of the sub-cooled water.