Influence of tip clearance on performance of a contra-rotating fan |
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Authors: | Jian Xu Chunqing Tan Haisheng Chen Yangli Zhu Dongyang Zhang |
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Affiliation: | [1]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [2]Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 1 O0190, China |
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Abstract: | Influences of tip clearance on the tip flow and associated loss mechanism in a contra-rotating axial flow fan has been studied
in the paper, based on three dimensional numerical results. The results with different tip clearance are compared in terms
of stage efficiency, relative total pressure loss coefficient, flow angle. It is found that the efficiency of the contra-rotating
fan changes almost linearly with increment of the tip clearance, however, efficiency of the rear rotor is observed to decrease
more dramatically than that of the forward rotor given same tip clearance variation. The analysis on the flow structure indicates
that the tip region flow field is qualitatively similar in both rotors. However, with the same clearance value, the leakage
flow in the rear rotor is effected by a tip leakage vortex of greater intensity caused by relative loading levels and the
inter rotor interaction. |
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Keywords: | |
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