Abstract: A row of jets discharging normally into a confined cylindrical crossflow was numerically investigated using the control volume based finite difference method. The relationship between the temperature trajectory and the upstream flow and geometric variables was determined.Parameter variations studied include nozzle diameter, nozzle number, duct radius, jet and mainstream volume flow, temperature ratio and dynamic pressure ratio. It was found that the dynamic pressure ratio, the number of nozzle and nozzle spacing are significant variables. A logarithmic function describing the relationship between penetration depth and dynamic pressure divided by the square of nozzle number was derived by fitting the data of the computation results. For an optimal mixing the values for penetration depth and the nozzle spacing were described. A suggested design procedure was presented which can be used as a first approach in configuration design.

Key words: Jet flow;Gas turbine;Turbulent mixing;Numerical simulation

摘要： 用基于控制体的有限差分方法对一排射流横向喷入管流的流场进行了数值分析 ,以建立流场温度分布和上游流动条件及几何参数的关系。可变的参数包括 :喷嘴直径 ,喷嘴数 ,圆柱管半径 ,射流与主流的体积流量比、温度比和动压比。结果发现 ,动压比、喷嘴个数和喷嘴间距是三个重要变量。通过对模拟结果的函数拟合 ,发现射流喷射深度与动压比除以喷嘴数的平方之间的关系可用一个对数函数很好地描述。给出了适于最佳混合的喷射深度和喷嘴间距 ,提出了可用于结构初步设计的程序

关键词: 射流;燃气轮机;湍流混合;数值仿真