火花放电合成射流与超声速来流相互干扰特性数值模拟研究

为了指导火花放电式合成射流激励器在超声速流动控制中的应用，数值模拟研究了火花放电合成射流与超声速来流的相互干扰特性。研究表明火花放电式合成射流在超声速流场中产生强烈扰动，产生较强的激波结构；随着射流的喷出，激励器上游分离区和流场中激波呈先增强后减弱的趋势，激波由弓形激波逐渐弱化为斜激波，并且随着放电能量的增加射流与主流的动量通量比不断增大，射流的干扰和控制能力显著增强。由于超声速流的较大惯性及其对腔内气体的引射作用，激励器的腔体回填速率大幅下降、回填时间明显增长，使得激励器的工作频率受到很大限制。

Numerical simulation of interaction of spark discharge synthetic jet with supersonic flow

By equating the physical effects of the spark discharge with gas Joule heating and adding source term in energy equation,a phenomenological simulation of spark discharge syn-thetic jet issuing into supersonic flow was accomplished.The interaction of the spark discharge synthetic jet with the supersonic crossflow was investigated,the results show that spark dis-charge synthetic jet can cause separation and reattachment in the supersonic flow,and relatively strong bow shake waves are generated.The upstream separation length and strength of shake wave increase at first and then decrease as jet spouts out.The shake wave is bow-shaped at the beginning and gradually becomes oblique as it weakens.The jet-to-crossflow momentum flux ratio and interaction effect increase greatly as discharge energy rises.Because of the big inertia and injection of supersonic flow,the refill mass rate of actuator declines.