Effect of J-Groove on the Suppression of Swirl Flow in a Conical Diffuser

被引：42

作者：

Kurokawa, Junichi ^{[3
]}

Imamura, Hiroshi ^{[2
]}

Choi, Young-Do ^{[1
]}

机构：

[1] Mokpo Natl Univ, Dept Mech Engn, Jeonnam 534729, South Korea

[2] Wind Energy Inst Tokyo Inc, Minato Ku, Tokyo 1050004, Japan

[3] Yokohama Natl Univ, Fac Engn, Hodogaya ku, Yokohama, Kanagawa 2408501, Japan

来源：

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME | 2010年 / 132卷 / 07期

关键词：

fluid machinery; diffuser; swirl flow; draft surge; J-groove;

D O I：

10.1115/1.4001899

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The purpose of this study is to examine the validity of J-grooves in controlling and suppressing the swirl flow in a conical diffuser, for draft surge suppression in a Francis turbine, which is caused by the swirl flow from the runner outlet into the draft tube. "J-groove" composed of shallow grooves and mounted parallel to the pressure gradient on the diffuser wall is a very simple passive device to suppress several abnormal phenomena in turbomachinery. The experimental study has been performed using the conical diffuser with a divergent angle of 20 deg. The measured results of the velocity distribution in the diffuser show that a considerable reduction in the swirl intensity is attained by using J-grooves. Besides, the amplitude of pressure fluctuation caused by the rotation of the vortex core around the dead water region near the diffuser inlet is reduced by J-grooves. [DOI: 10.1115/1.4001899]

引用

页码：071101 / 071101

页数：8