燃气射流复燃流场的数值计算

Numerical Simulation for Non Equilibrium Chemically Reacting Jet Flow

目的 研究非平衡化学反应流动的数学模型，进行火箭燃气射流复燃流场的数值研究； 方法 从Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程出发，采用１２ 组分１１ 个反应的化学动力学模型，建立化学反应流动的微分方程组，然后采用差分方程离散，其中对流项采用了高精度的３ 阶ＥＮＯ格式； 结果 计算得到了包含各组分在内的流场诸参数的分布，分析了燃气射流复燃流场的特点； 结论 化学反应集中在混合层内，近尾核心区可视为化学反应冻结流；

Aim The mathematical model of non equilibrium chemically reacting flow was studied and the re burning jet flow field of a rocket was simulated numerically. Methods With chemical kinetic model for 12 species and 11 steps reaction, the partial differential equations of chemically reacting flow were given based on full Navier Stokes equations. Difference schemes, one of which was third order ENO for convective terms, were used to discretize them. Results The distributions of parameters in the flow, including species, were obtained and the structure of the re burning flow was analyzed. Conclusion The chemical reactions were concentrated in the mixing layer of a jet and the flow in the core can be regarded as the chemical frozen flow.