横向紊动射流流场结构的数值分析

利用：RNG k-ε模型对横流中单股紊动射流流场的流动特性进行了数值模拟。运用SIMPI,EC算法求解了适体坐标系下的控制方程，采用壁面函数法处理近壁区流动。射流内部有分叉现象，射流喷孔背风侧的流动出现了分离并形成了尾迹区，分析了分叉及尾迹涡的生成机理。文中给出了射流与主气流速度比等于2和4的速度场、涡量场和压力场，计算与实验的结果吻合较好。结果表明：射流与主气流速度比直接影响流场特性，其值越大射流对主气流的影响越大。

A NUMERICAL SIMULATION OF THREE-DIMENSIONAL TURBULENT JETS IN CROSSFLOW

By using the RNG k-e turbulent model numerical simulation has been performed for investigating the characteristics of the turbulent jet issuing normally into a crossflow. The SIMPLEC algorithm in the body-fitted coordinates and wall-function method are adopted to simulate the flow at two jet-crossflow velocity ratios, 2 and 4. Mean and turbulent statistics computed from the simulations match experimental measurements reasonably well. The larger jet-crossflow velocity ratio can change the flow characteristics more obviously. There is a bifurcation in the jet, and the separation events and the wake in the lee of the jet exit are found, and the forming mechanism is also analyzed.