Comparative investigation on axial flow pump rotors of free vortex and non-free vortex design

被引：0
|
作者：
Vad, János [1 ]
Bencze, Ferenc [1 ]
Benigni, Helmut [2 ]
Glas, Wolfgang [2 ]
Jaberg, Helmut [2 ]
机构：
[1] Department of Fluid Mechanics, Budapest Univ. of Technol. and Econ., H-1521 Budapest, Hungary
[2] Inst. for Hydraulic Fluid Machinery, Technical University of Graz, Graz, Austria
来源：
Periodica Polytechnica Mechanical Engineering | 2002年 / 46卷 / 02期
关键词：
Axial flow turbomachinery - Boundary conditions - Computational fluid dynamics - Computer simulation - Design - Intake systems - Reynolds number - Turbomachine blades - Viscosity of liquids - Vortex flow;
D O I：
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中图分类号：
学科分类号：
摘要：
Comparative computational investigation has been carried out on two axial flow pump rotors having identical basic geometrical and flow rate parameters but differing in the design methods. The two rotors were designed for free vortex (FV) and non-free vortex (NFV) operation. The global as well as pitchwise-averaged and pitchwise resolved blade passage flow characteristics were investigated in detail. It has been concluded that NFV design is an effectual method for increase of specific performance but the increased risk of cavitation requires careful blade optimisation. It was found that the design blade circulation must kept constant near the hub in order to diminish the risk of corner stall. Furthermore, it has been anticipated that for the NFV rotor the efficiency drops more intensely with increase of tip clearance and the noise level may be lower than for the FV rotor.
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页码：107 / 116
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