燃气自由射流的正格式数值模拟  

Numerical simulation of gas free jet by positive schemes

作　　者：朱孙科[1] 陈二云[2] 马大为[1] 乐贵高[1] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]上海理工大学动力学院,上海200093

出　　处：《空气动力学学报》2011年第3期380-384,共5页Acta Aerodynamica Sinica

基　　金：国防基础科研项目(A2620061288);上海高校选拔培养优秀青年教师科研专项基金(slg09003);上海市教委重点学科项目(J50501)

摘　　要：采用二阶正格式方法对复杂燃气自由射流进行了数值模拟。将二维守恒方程的正格式方法发展到轴对称Euler方程组的求解,并对不同欠膨胀压力比下的燃气射流进行了数值计算。计算结果表明,该方法能够较好捕捉到波胞、滑移线、射流边界以及三波点等复杂射流流场波系结构,与实验照片反映的流动特征及高精度、高分辨率的三阶间断有限元方法的计算结果吻合较好,马赫盘位置与理论预估值和实验测量结果误差较小。证明该方法对激波具有较强的捕捉能力,为此类流动的数值研究提供了一种新手段。Gas free jet with varies underexpanded pressure ratio was simulated numerically using second order positive schemes,which was developed to solve the axisymmetric Euler equations based on two dimensional conservation laws.Computational results indicate that the method can capture the wave structures of jet flow fields including shock cell structure,slip streams,jet boundary and the triple point well.Agreement between the numerical results and experimental data or third order discontinuous Galerkin finite element method is fairly satisfactory.For the Mach disk locations,excellent agreement is obtained between numerical results and experimental measurements.It indicates that the method have high capability in capturing shocks.A new method for this flow numerical study is presented.

关 键 词：气体动力学 燃气射流 正格式 数值模拟 

分 类 号：O354[理学—流体力学] V211[理学—力学]