论文部分内容阅读
采用间断有限元方法对轴对称可压缩Euler方程组进行数值离散,并对非稳态垂直冲击射流进行了仿真模拟。计算结果表明,采用该方法能够较好地捕捉到起始冲击波在平板上反射后形成的曲面激波、马赫反射以及三波交点等复杂流场波系结构;随着时间的发展,冲击平板中心区域有明显的回流现象;平板表面的压力系数分布曲线与实验测量结果吻合较好;表明该方法是有效的,为冲击射流的数值仿真提供一种新的手段。
The discontinuous finite element method is used to discretize the axially symmetric and compressible Euler equations. The unsteady vertical impact jet is simulated. The calculation results show that this method can capture the wave structure of complex flow field, such as surface shock, Mach reflection and three-wave intersection, which are formed by the reflection of the initial shock wave on the flat plate. With the development of time, The phenomenon of reflow is obvious. The curve of the pressure coefficient on the flat surface agrees well with the experimental result. It shows that this method is effective and provides a new method for the numerical simulation of impinging jet.