| 李志伟,槐文信,钱忠东.静水环境中径向紊动射流数值模拟[J].水利学报,2009,40(11): |
| 静水环境中径向紊动射流数值模拟 |
| Numerical simulation of turbulent radial jets in static ambient |
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| DOI： |
| 中文关键词: 径向射流 流速半宽 PIV 湍流模型 |
| 英文关键词: radial jets velocity half_width PIV turbulence model. |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Radial jets in static ambient were studied both by experimental and numerical modeling. The jets centerline velocity distributions were measured by the PIV for a wide range of operating conditions. The Realizable k-εmodel and RNG k-εmodel were used to calculate the radial jets. It is concluded that the Realizable k-εmodel is more efficient than RNG k-εmodel in simulating the characteristics of the radial jets by comparing with experimental results. And then the Realizable k-εmodel 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. |
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