Effects of Inflow Distortion due to Hub Cap's Shape on the Performance of Axial Flow Fan
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概要
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Performance characteristics of an axial flow fan having distorted inlet flow have been investigated using numerical analysis. Two kinds of hub-cap, rounded and right-angled front shape, are tested to investigate the effect of inlet flow distortion on the fan performance. In case of right-angled front shape, axisymmetric distorted inflow is induced by flow separation at the sharp edge of hub-cap, and the characteristics of the inflow depend on the distance between hub-cap and blade leading edge. Three-dimensional Reynolds-averaged Navier-Stokes equations are introduced to analyze the flow characteristics inside the blade passage. Numerical solutions are validated in comparison with experimental data measured by a five-hole probe downstream of the fan rotor. It is found from the numerical results that non-uniform axial inlet velocity profile near the hub results in the change of inlet flow angle. Large recirculation flow upstream the fan rotor for the right-angled hub-cap induces separated flow on the blade surfaces near the hub region, and thus deteriorates the performance of fan rotor. The effect of the distance between hub-cap and blade leading edge on the efficiency is also discussed.
- 一般社団法人 日本機械学会の論文
著者
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Kim Kwang-yong
Department Of Mechanical Engineering Inha University
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Jang Choon-man
Fire & Engineering Services Research Department Korea Institute Of Construction Technology
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CHOI Seung-Man
Department of Mechanical Engineering, Inha University
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JANG Choon-Man
Fire & Engineering Services Research Dept., Korea Institute of Construction Technology
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