电弧加热试验条件下钝舵表面热环境数值研究

摘要

The flowfield and aeroheating environment of an blunt-fin in an arcjet heating condition is simulated with computational fluid dynamics(CFD) method in this paper. the characteristic of surrounding flowfield under different experiment condition was analyzed as well as the corresponding surface heat flux on fin front and sidewall. A comparison was conducted between computational result and experiment. When there’s only a single oblique shockwave on fin front, the computation result meets the experiment well. There exist several high-heatflux spots on the front and a triangular area of low heatflux in this case. The mechanism of this distribution was explained by flowfield analysis result. But when oblique shockwaves occur at the nozzle exit, the reflected shockwave interacts with boundary layer which caused very high aeroheating at the interaction spot. But restricted to the measurement devices, the shockwave/boundary layer interaction features cannot be reflected in the experiment result, so the computation results are not coincident with the experiment.%采用计算流体动力学（CFD）方法模拟钝舵在电弧加热试验中的流场和气动热环境，分析不同来流状态下舵周围流场的特征，以及对应的舵前缘和侧面热流分布规律，并与试验结果进行对比。当仅存在舵前缘斜激波时，计算结果和试验结果符合较好，根据流场分析结果解释了舵前缘多个局部高热流区和侧面三角形低热流区的成因机理：当喷管出口出现斜激波系时，出现斜激波系与舵前缘边界层的相互干扰，导致干扰区热流变高，从而改变舵前缘热流分布规律。但是由于测量手段的限制，某些流场特征无法在试验结果中体现，导致计算结果和试验结果不完全符合。