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| 1 | Analysis of ventilated cavitation around a cylinder vehicle with nature cavitation using a new simulation method显示文摘In the present paper, a new simulation method is developed for unsteady cavitating flow with air ventilation,which is very useful for alleviating the pressure oscillation in hydroturbine draft tube and reducing the drag force on an underwater vehicle. Because the fluid includes three components, i.e., the water, vapor, and air, the interactions between water–air and water–vapor are treated by applying the level set method, and the effect of surface tension is taken into account in governing equations. Further, the phase change between the water and the vapor is modeled by a homogeneous model,where the effect of air injection is considered by applying the air volume fraction in the mass transport equation. For calibration, the cavitating flows around a cylinder vehicle were simulated using the proposed method, and the numerical results were compared with the experimental data at three different ventilation conditions. The good agreement of cavitation evolutions between the simulation and the experiment indicated that the proposed method was acceptable for the simulation of ventilated cavitating flows with nature cavitation and would be usable for various engineering applications.Moreover, the vorticity analysis depicts that the vortex is closely related to cavitation evolution, and air injection much changes the vorticity production in cavitating flow. It was also revealed that vorticities only occurred in regions with high vapor/air volume fraction and the vortex stretching term created the most vorticities. | An Yu Xianwu Luo Bin Ji | 2015 | Science Bulletin2015，60，21： | 5 |
| 2 | 多能互补条件下转轮优化对水轮机低负荷区稳定性能的影响显示文摘多能互补系统中新能源发电的不稳定性使得作为调能机组的水电机组频繁在水力效率低、振动剧烈的低负荷区运行,严重影响机组的寿命。该研究以多能互补系统中的混流式水轮机为研究对象,在前期考虑工况权重系数的转轮多工况优化设计结果基础上,对比分析了优化前后转轮叶片的几何参数变化,不同负荷区的水轮机内部流动状态及压力脉动特征差异。研究结果表明:优化后叶片包角、安放角以及叶片长度均有所增加,叶片表面压力分布及转轮进出水边速度矩分布更加均匀,有助于改善水轮机低负荷区的空化性能、提高能量转换能力。转轮进出口安放角的增加很好地抑制了转轮进口背面脱流涡及出水边的脱流涡区,改善了尾水管的入流条件,使得尾水管涡带的强度和影响范围明显减小。叶片优化后,转轮内各频率的压力脉动幅值均有不同程度的降低,尾水管内压力脉动改善明显。尾水管内0.2f_(n)(f_(n)为转频)和14f_(n)压力脉动在低负荷工况(OP1)幅值降幅分别为45%和40%,额定工况(OP4)尾水管内0.2f_(n)压力脉动基本消除,14f_(n)压力脉动幅值降幅为31%。本文所得研究结果对多能互补系统中水轮机转轮的设计优化及运行具有参考意义。 | 赵亚萍 郑小波 张欢 郭鹏程 | 2023 | 农业工程学报2023，39，7： | 1 |
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