超声速脉冲风洞起动过程数值模拟

为研究超声速脉冲风洞起动激波的传播过程和流场建立过程中流场结构的变化,对其起动过程进行了数值模拟.包含组分扩散的控制方程为二维粘性、可压缩、非定常的守恒型Navier-Stokes方程.用中心有限体积法进行空间离散,用隐式双时间步方法处理非定常时间项.计算结果与试验结果基本一致.研究表明,起动激波速度由于内型面的变化而改变,并在隔离段中达到最大值.

Numerical Simulation of Starting Process of Supersonic Pulse Wind Tunnel

To analyze the transmitting process of incident shock and the transient flows,the starting process was simulated numerically.In the simulation,the control equations were the conservational Navier-Stokes equations with a species diffusion term,which describe two-dimensional viscous,compressible and unsteady flows.The cell-centered finite volume scheme was used for space discretization,and the dual-time stepping method was taken to calculate the unsteady term.The calculated results reasonably agreed with the experimental ones.The research shows that during the starting process,the velocity of incident shock changes due to the variation in inner profile,and gets its maximum at the isolator.