瞬时起动的空腔初期流动

采用有限体积方法求解非定常可压缩Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程，研究了受限空腔在射流驱动下瞬时起动的空腔初期流动问题，数值计算结果给出了时间序列的速度矢量图和空腔出口流量随时间的变化，展示了射流、分离、剪切层和旋涡的相互作用及其演变过程。根据流动结构特征，将空腔的初期流动过程分为三个阶段：初始涡结构形成阶段、三涡结构形成阶段和两涡结构形成阶段。

Initial Stage of Impulsively-Started Cavity Flow

The numerical investigation of initial flow in confined cavity driven impulsively by jet was performed. The unsteady compres- sible Navier-Stokes equations were solved by finite volume nlethod based on TVD scheme. The numerical results present the development of outlet flow rate and the time serial velocity vcctors plots,which show the interaction of jet,separation, shear layer and vortexes in the cavity,and their evolution process.According to the characteristic features,the cavity initial flow is divided into three stages,i.e. ,initial-vortexes flow pattern,three-vortexes flow pattern and two-vortexes flow pattern.