静水环境中径向紊动射流数值模拟

为了对径向射流的流速场进行分析研究，进行了静水环境中径向射流的实验。基于PIV测速仪得到了多种工况射流中线流速分布资料。进而分别采用Realizable k-ε模型和RNG k-ε模型对径向射流进行了数值计算，计算结果与实验资料的对比表明，Realizable k-ε模型比较适合径向射流的数值模拟，然后利用Realizable k-ε模型对6种不同工况下静止环境中径向射流进行了数值模拟。数值模拟的结果分析表明，径向射流横截面上流速分布为高斯分布、射流速度半宽沿程增大且与距射流出口的距离成正比以及中线流速沿程衰减与距射流出口的距离成反比，通过引入特征长度的概念，使射流的无量纲中线流速衰减和无量纲速度半宽沿程变化呈现出较强的规律性。

Numerical simulation of turbulent radial jets in static ambient

Radial jets in static ambient were studied both by experimental and numerical modeling. The jets centerline velocity distributions were measured by the PFV for a wide range of operating conditions. The Realizable κ-ε model and RNG κ-ε model were used to calculate the radial jets. It is concluded that the Realizable κ-ε model is more efficient than RNG κ-ε model in simulating the characteristics of the radial jets by comparing with experimental results. And then the Realizable κ-ε model is used to simulate the radial jets for six different conditions in static ambient. The radial jets velocity distributions in different cross-section satisfy Gaussian. Along the radial direction, the centerline velocities decrease and the jets half-widths increase with the distance. By introducing the concept of characteristic length, the decay of the non-dimensional jets centerline velocity and the non-dimensional velocity half-width have obvious regularities.