电弧放电减弱激波强度的仿真研究

Numerical Simulation of Shock Wave Intensity Reduction by Arc Discharge

为了研究电弧等离子体数学建模,首先分析了等离子体与超声速流场相互作用的机理,然后开展了不同放电组数、放电位置与电弧温度对激波减阻效果影响的仿真研究。结果表明:随着激励位置的前移,主流激波强度减小;随着激励组数的增加,主流激波前移,主流激波强度减小;热量源项温度存在一个阈值,能够使流场出现热节流现象。因此当温度继续增大后,激波变化不明显。最后进行了实验验证。研究结果表明施加等离子体激励减弱了尖劈前方斜激波的强度。同时,进一步证明了等离子体与超声速流场耦合的热机理。

This paper firstly analyzes the principle of the interaction of the plasma and supersonic flow and then establishes a mathematic model of the plasma on the basis of the main factors affecting the interaction.The simulation of interaction of plasma and supersonic flow has been performed and tested by experiment.The results of the study show that the plasma actuation reduces the shock wave intensity and proves the energy mechanism of interaction to be proper.The numerical simulation of shock wave intensity alteration with different plasma positions,different plasma groups and different plasma temperatures has been performed.The results show that： shock wave intensity reduces with plasma position moving ahead and plasma groups increasing;there is a threshold of the temperature of plasma which could make the flow throttling.The changes of shock wave intensity become inconspicuous because 2000k has already exceeded the threshold.