一种无烧蚀自适应的减阻防热新方法研究

为了解决传统激波针方法在高超声速实际应用中存在的问题,结合逆向喷流方法以及激波针方法,提出了一种无烧蚀自适应的高超声速减阻防热新方法一可伸缩姿态自调整喷流激波针方法(TSAJS).通过数值模拟的方法,针对不同L/D参数的TSAJS外形,对不同攻角、来流马赫数以及喷流马赫数状态下的流场结构、壁面压力和热流分布以及阻力系数等进行了对比研究.结果表明,TSAJS方法在有攻角状态仍然能够有效降低外形的阻力以及壁面热流,L/D为1的TSAJS外形可使壁面热流峰值及阻力系数均降低65％左右.在喷流作用下,TSAJS方法还可避免激波杆头部直接暴露于来流而产生严重的气动加热,从而不需要再特别考虑激波针的防热问题.

Investigation on a new method of adaptive drag reduction and non-ablation thermal protection system for hypersonic vehicles

A new adaptive drag reduction and non-ablation thermal protection method named Telescopic Self-aligning Jet-Spike(TSAJS) is proposed to improve the conventional spiked method employed in hypersonic vehicles.Firstly,the paper analyzes the mechanism of the new method,which is based on the forward-facing jet and the spike method.And then numerical simulations are carried out for TSAJS geometries with different L/D ratios,free stream and jet Mach numbers and angles of attack.The flow structures,pressure and heat flux distributions on nose surface and geometry drags are analyzed as well.Results demonstrate that the TSAJS method is able to reduce the drag and surface heat effectively even at large angles of attack.For the L/D=1 TSAJS configuration,the drag coefficient and maximum surface heat are reduced by 65%.Moreover,in our method,the spike nose is not exposed directly to the free stream,which discards the necessary of thermal protection for the spike.