高超声速流动中液滴蒸发对流动参数的影响研究

Study of the droplet evaporation impact on flow parameters in hypersonic flow

采用带有非平衡相变模型的数值方法对高超声速流动中液滴蒸发的影响进行了研究,重点探讨了液滴蒸发对斜激波下游区域流场和劈面参数的影响。研究结果表明:液滴在激波后区域的蒸发存在弛豫现象,蒸发弛豫过程与激波强度相关,并影响模型表面气动参数的均匀性;当偏转角从3°增大至16°时,研究发现特别是偏转角为10°时,激波强度刚好能使液滴在整个激波下游区域完全蒸发,此时蒸发引起的流场参数不均性影响最大,与不考虑蒸发时相比,液滴质量含量、压强、静温减小幅度分别达到27.2g/kg、401Pa、54K,该三项参数变化量的比分别达到96.8%、4.8%、14.2%。

The analysis of droplet evaporation in hypersonic flow by the numerical method with nonequilibrium phase transition model is presented.Influence of the droplet evaporation on the parameters of the post-oblique shock flow field and wedge surface are mainly discussed.Research results show that relaxation phenomenon exists in droplets evaporation in after-shock area.Such kind of the evaporation relaxation process is related to the intensity of shock wave and affects the uniformity of aerodynamic parameters on the wedge surface.During the increasing process of the deflection angle from 3°to 16°,it is found that when the deflection angle is 10°,the shock wave intensity can exactly make the droplets completely evaporate in the shock wave downstream.This is a critical condition that the evaporation affects the uneven flow field parameters most.Compared with non-evaporation case,the reduction of the droplet mass content,static pressure and static temperature reaches 27.2 g/kg,401Pa and 54K,respectively,and the variations are 96.8%,4.8%and 14.2%correspondingly.