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| 1 | Hydraulic fluctuations during the pump power-off runaway transient process of a pump turbine with consideration of cavitation effects显示文摘A runaway transition after the pump power interruption and the simultaneous guide vane servomotor failure is one of the most dangerous and complex transitions for a pumped storage power system(PSPS).This paper analyzes the fluctuation behavior and mechanism of a PSPS during a runaway transition caused by the pump power interruption.The transient cavitation flow in the PSPS is simulated by using a one-dimensional and three-dimensional coupling flow simulation method for the runaway transition.Subsequently,the effects of the transient fluctuation of the radial hydraulic thrust on the runner and transient pressures are analyzed using the short-time Fourier transform method.Finally,the mechanisms are analyzed based on the analysis of the internal flow field.This study suggests that the extreme fluctuation generally occurs near the critical transformation points between the two operation modes.In addition,the extreme fluctuation behavior is primarily related to the local backflow near the runner inlet and the unstable cavitation phenomena in the runner and the draft tube.This finding helps for optimizing the runner design to resolve the instability problems of a PSPS. | Xiao-long Fu De-you Li Hong-jie Wang Yong-guang Cheng Xian-zhu Wei | 2021 | Journal of Hydrodynamics2021，33，6： | 4 |
| 2 | 高压水射流喷水推进装置空化流动及推力特性仿真分析显示文摘高压水射流喷水推进器是一种新型推进装置,其高速射流具有强剪切作用并将引起剧烈的剪切空化,从而对推力性能会产生重要影响。利用大涡模拟对推进装置的强剪切空化射流特性进行了仿真研究,探究了空化射流的流动机理及空化云演变规律,分析了空化现象对反推力特性的影响。结果表明:高速射流射入自由水域时将产生大量低压旋涡从而诱导剪切空化,并对反推力具有一定的增强作用,反推力增幅随空化程度的增强而增大;但受空化云形态变化影响,反推力将呈现脉动特性,其脉动幅值随着空化程度加剧逐渐增大,脉动主频随空化程度加剧而逐渐减小。 | 暴春航 龙新平 梁蕴致 张祖提 张增磊 | 2023 | 液压与气动2023，47，1： | 1 |
| 3 | 调节阀内瞬态空化压力脉动特性分析显示文摘基于计算流体动力学方法,数值研究了液压调节阀内瞬态流动及其压力脉动特性。通过对近壁面的压力信号进行频谱分析,讨论空化形态的变化过程与壁面压力波动之间的关系。结果表明:调节阀内云状空穴变化呈现出准周期性的发展过程,空化频率为565 Hz,其空化变化过程包括:附着型空穴生长、附着型空穴断裂和脱落以及游离型空穴生长和溃灭;空穴尾部近壁面处的逆压力梯度是引起反向射流的主要原因,反向射流与主流相切形成漩涡,促使附着型空穴脱落;此外,空穴发展变化也对流道内压力脉动产生影响,阀内不同截面上的平均压力变化具有相同的主导频率,且该频率与附着型空穴非定常准周期生长、断裂、脱落频率基本吻合。 | 刘秀梅 谢永伟 李贝贝 贺杰 陈劲松 | 2022 | 振动与冲击2022，41，19： | 0 |
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