等离子体激励控制细长体分离流动研究

Study on the separation flow of thin body controlled by plasma excitation

为研究等离子体激励对细长体大迎角分离流场的控制作用,运用了模拟等离子体激励作用效果的唯象学模型,将等离子体对流动的控制作用简化为对流场的能量注入,数值模拟研究了等离子体放电能量密度、放电位置对控制效果的影响。结果表明:在细长体头部施加等离子体激励,能够控制细长体背涡结构,实现对细长体大迎角下产生的侧向力进行控制;当等离子体激励位置不变时,放电功率越大,对细长体大迎角分离流场的影响越大;当等离子体激励越远离头部时,对细长体分离流场的控制作用越弱;当等离子体激励与低位涡同侧并且远离迎风面对称面附近时,才能实现对细长体分离流场的控制。

In order to study the control effect of plasma excitation on the separated flow field of a slender body at high angles of attack,a phenomenological model is used to simulate the effect of plasma excitation,and the control effect of plasma on the flow is simplified as the energy injection into the flow field.The influence of plasma discharge energy density and discharge position on the control effect is studied by numerical simulation.The results show that the back vortex structure of the slender body can be controlled by applying plasma excitation at the head of the slender body,and then the lateral force generated by the slender body at high angles of attack can be controlled.When the plasma excitation position is constant,the larger the discharge power is,the greater the influence on the separation flow field of the slender body at high angle of attack is;When the plasma excitation is far away from the head,the control effect on the separation flow field of the slender body is weaker;When the plasma excitation is on the same side of the low vortex and far away from the symmetrical surface of the windward surface,the separation flow field of the slender body can be controlled.