Effects of Axial Clearance on Hydraulic Characteristics of Counter-Rotating Water-Jet Pump

被引：0
|
作者：
Han W. [1 ,2 ]
Xu D.-D. [1 ]
Guo W. [1 ]
Su M. [3 ]
Chen Y. [1 ]
Han Y. [1 ]
机构：
[1] College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou
[2] State Key Laboratory of Gansu Fluid Machinery and System, Lanzhou
[3] College of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2019年 / 40卷 / 09期
关键词：
Axial clearance coefficient; Contra-rotating axial flow pump; External characteristic; Internal flow; Water jet propulsion;
D O I：
10.13675/j.cnki.tjjs.180713
中图分类号：
学科分类号：
摘要：
The axial clearance coefficient δ between first and secondary stage impeller is defined to investigate the effects of axial clearance on hydraulic performance and thrust characteristic of the contra-rotating water-jet pump. Refering to the range of axial clearance between guide vane and impeller, 5 water-jet pump models with different axial clearance coefficient were designed. Based on the RNG k-ε turbulence model and SIMPLEC algorithm, the numerical simulation of five groups water-jet pump models with different clearance coefficient were carried out. The pump external characteristics, internal flow characteristics and thrust characteristics are analyzed with different axial clearance coefficients. Numerical results agree well with the experience results, which verify the effectiveness of numerical simulation method. With the increase of δ within the scope of the study, the low pressure area of the front impeller can be improved effectively. The energy from the front impeller is difficult to be absorbed by the rear impeller with 0.13<δ<0.17. The efficiency of the water-jet pump can be promoted as the axial clearance coefficient range from 0.09 to 0.13, the efficiency can be up to 85% as δ=0.09. When the axial clearance coefficient is greater than 0.17, the value of thrust displays a significant downtrend. As a result, the axial clearance coefficient δ has been proved as a significan factor to hydraulic characteristics of counter-rotating water-jet pump through the analysis of internal flow, external characteristics and thrust characteristics. © 2019, Editorial Department of Journal of Propulsion Technology. All right reserved.
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页码：2144 / 2152
页数：8
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