| 间隙尺寸对水翼叶顶旋涡空化流动影响的试验研究 |
| |
| 引用本文： | 刘雷鸣,刘影,赵宇,王国玉.间隙尺寸对水翼叶顶旋涡空化流动影响的试验研究[J].排灌机械工程学报,2016,34(7):573-578. |
| |
| 作者姓名： | 刘雷鸣 刘影 赵宇 王国玉 |
| |
| 作者单位： | 北京理工大学机械与车辆学院, 北京 100081 |
| |
| 摘 要： | 采用试验方法对不同间隙尺寸的水翼叶顶旋涡空化流动进行研究.试验在闭式空化水洞中进行,应用高速全流场显示技术对旋涡空化形态进行观测,采用图像处理技术对结果进行处理,并对比分析间隙尺寸分别为0.5和2.0 mm的2种工况下间隙空化流动的发展规律.研究结果表明:随着空化数的减小,叶顶空化流动可以分为涡空化初生阶段、间隙内部附着空化发展阶段和剪切层空化发展阶段3个典型阶段;在涡空化初生阶段,大间隙工况下涡空化沿流动方向延伸距离大于小间隙工况;在间隙内部附着空化发展阶段,随着空化数的降低,大间隙工况下附着空化的初生和发展均领先于小间隙工况;在剪切层空化发展阶段,大间隙工况下剪切层空化形态趋于稳定时对应的空化数大于小间隙工况,并且其向下游延伸距离大于小间隙工况.
|
| 关 键 词： | 水翼 叶顶间隙涡 空化 间隙尺寸 高速摄像 |
| 收稿时间： | 2015-11-18 |
Experimental investigation into influence of clearance size on cavitating vortical flows in hydrofoil tip |
| |
| LIU Leiming,LIU Ying,ZHAO Yu,WANG Guoyu.Experimental investigation into influence of clearance size on cavitating vortical flows in hydrofoil tip[J].Journal of Drainage and Irrigation Machinery Engineering,2016,34(7):573-578. |
| |
| Authors: | LIU Leiming LIU Ying ZHAO Yu WANG Guoyu |
| |
| Institution: | School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China |
| |
| Abstract: | Cavitating vortical flows in a hydrofoil tip with different tip clearance sizes are studied experimentally. A series of experiments are conducted in a closed-loop cavitation tunnel. The cavities are observed with a high speed camera and are analyzed by using image processing.The cavitating flow developing characters in the different size clearances(0.5 mm, 2.0 mm)are compared. Based on the results, three typical cavitation stages can be defined with decreasing cavitation number, namely incipient cavitation(I), attached cavitation(II), and shear layer cavitation(III). In stage I, the streamwise length of cavity in the big gap is larger than that in the narrow gap. In stage II, the attached cavity inside the large gap develops faster than that in the small gap in both the cavitation inception and the developing phases with decreasing cavitation number. In stage III, the critical cavitation number for the formation of triangular shear layer cavitation in the large gap is higher than that in the small gap; meanwhile, the cavity extends further downstream in the large gap than in the small gap as well. |
| |
| Keywords: | hydrofoid tip leakage vortex cavitation tip clearance size high speed camera |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《排灌机械工程学报》浏览原始摘要信息 |
| 点击此处可从《排灌机械工程学报》下载免费的PDF全文 |
|
