| 基于空化流动计算的混流式水轮机尾水管的压力脉动 | |
| 周凌九 ; 王正伟 ; ZHOU Lingjiu ; WANG Zhengwei | |
| 2010-05-13 ; 2010-05-13 | |
| 关键词 | 尾水管 空化涡带 压力脉动 空化流计算 draft tube cavity vortex rope pressure fluctuations simulation of cavitating flow TV734.1 |
| 其他题名 | Pressure fluctuations in a Francis turbine draft tube calculated by cavitating flow simulation |
| 中文摘要 | 为了保证混流式水轮机运行安全,分析了尾水管内部的空化流场。假设气液混相均质,并考虑不可凝结气相,采用基于组份输运方程,求解了尾水管内气液混相均质流的雷诺平均N-S方程以及气相组分输运方程。结果表明:不同装置空化系数下尾水管压力脉动主频率变化不大,但在极低的装置空化系数下,削波现象导致更低频率成分的出现。在较大的装置空化系数下,空化涡带直径较小,压力脉动幅值随装置空化系数的变化不明显;当装置空化系数小于某一临界值后,随装置空化系数的降低,压力脉动幅值增加并达到一个最大值。计算结果解释了模型试验现象。; Vortex cavitations in a Francis turbine draft tube were simulated to study the turbine safety by solving the 3-D unsteady Reynolds averaged Navier-Stokes equations with a transport-equation-based cavitation model of pseudo-homogeneous flow theory.The results show that the Thomas number,σp,has little influence on the main frequencies of the pressure fluctuations.However,for very small σp values,there are lower frequencies components in the pressure fluctuation spectrum since the troughs of the pressure waves are "cut-off" at the vaporization pressure.For large σp values,the pressure fluctuation amplitudes vary little with the σp value since the cavity rope diameter is small.As the σp value decreases the cavity vortex rope becomes thicker and the pressure amplitudes increase rapidly to the maximum.The calculated results agree well with experimental data to give reasonable explanations to the phenomena in model tests. |
| 语种 | 中文 ; 中文 |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/31660]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 周凌九,王正伟,ZHOU Lingjiu,等. 基于空化流动计算的混流式水轮机尾水管的压力脉动[J],2010, 2010. |
| APA | 周凌九,王正伟,ZHOU Lingjiu,&WANG Zhengwei.(2010).基于空化流动计算的混流式水轮机尾水管的压力脉动.. |
| MLA | 周凌九,et al."基于空化流动计算的混流式水轮机尾水管的压力脉动".(2010). |
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