期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
高速深冷介质动压密封液膜汽化相变性能分析 被引量:3
1
作者 冯瑞鹏 马润梅 +2 位作者 宋仁龙 李双喜 张志慧 《流体机械》 CSCD 北大核心 2020年第9期50-57,共8页
动压密封端面间液膜发生汽化相变,直接改变了端面间的流体润滑方式,对密封的稳定性产生重要影响。建立了液膜汽化相变数值计算模型,研究了不同工况和结构参数对液膜汽化相变程度和区域的影响,分析了液膜汽化相变后密封性能的变化规律。... 动压密封端面间液膜发生汽化相变,直接改变了端面间的流体润滑方式,对密封的稳定性产生重要影响。建立了液膜汽化相变数值计算模型,研究了不同工况和结构参数对液膜汽化相变程度和区域的影响,分析了液膜汽化相变后密封性能的变化规律。结果表明:工况和结构参数对液膜的汽化相变有着不同程度的影响,随着转速、压力和槽深的增加,液膜的汽化相变被抑制。当转速高于3×10^4 r/min、压力高于0.6 MPa、螺旋角大于20°、槽深大于7μm时,液膜会发生逆汽化现象。液膜的汽化相变对密封性能产生直接的影响。合理选择密封结构参数,可有效利用和控制相变,提高密封性能。 展开更多
关键词 汽化相变 螺旋槽 动压密封 相态分布 逆汽化
下载PDF
Experimental investigations of a prototype reversible pump turbine in generating mode with water head variations 被引量:1
2
作者 LI JinWei ZHANG YuNing YU JiXing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2018年第4期604-611,共8页
Influences of water head variations on the performances of a prototype reversible pump turbine are experimentally studied in generating mode within a wide range of load conditions(from 25% to 96% of the rated power). ... Influences of water head variations on the performances of a prototype reversible pump turbine are experimentally studied in generating mode within a wide range of load conditions(from 25% to 96% of the rated power). The pressure fluctuations of the reversible pump turbine at three different water heads(with non-dimensional values being 0.48, 0.71 and 0.90) are measured and compared based on the pressure data recorded in the whole flow passage of the turbine. Furthermore, effects of monitoring points and load variations on the impeller-induced unstable behavior(e.g. blade passing frequency and its harmonics) are quantitatively discussed. Our findings reveal that water head variations play a significant role on the pressure fluctuations and their propagation mechanisms inside the reversible pump turbine. 展开更多
关键词 reversible pump turbine pumped hydro energy storage pressure fluctuation generating mode prototype part load mode
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部