论文部分内容阅读
本文简要介绍了微射流作动器的工作原理及结构形状 ,应用涡量 流函数法对二维、粘性、非定常、不可压微射流流场进行了数值分析。针对微射流形成的特点 ,构造了一种微射流作动器出囗处周期性变化的吸 /排气速度边界条件。计算结果与已有的实验和理论分析结果进行了比较 ,证明了该方法的可行性。数值分析结果表明虽然微射流的净质量流率为零 ,但其动量流率却不为零 ;由于微射流作动器出口处速度的交替变化 ,在紧贴出囗处产生了旋涡对并向下游迁移形成微射流
In this paper, the working principle and structure of micro-jet actuator are briefly introduced. The flow field of two-dimensional, viscous, unsteady and incompressible micro-jet is numerically analyzed by using the eddy current function method. According to the characteristics of micro-jet formation, a suction / exhaust velocity boundary condition with periodic changes at the exit of micro-jet actuator was constructed. The calculated results are compared with the existing experimental and theoretical results, which proves the feasibility of the method. The results of numerical analysis show that although the net mass flow rate of the micro-jet is zero, the momentum flow rate is not zero. Due to the alternation of the velocity at the exit of the micro-jet actuator, The downstream migration to form a micro-jet