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《Numerical Prediction of Sound Intensity and Pressure Fluctuation of Aerodynamic Noise of a CounterRotating Axial Flow Fan》
ZHANG Yong-chao;WANG Wei-bin;BEI Guang-xia;ZHANG Yong-jian;CHEN Qing-guang
2010, 30 (1):
127-131.
DOI: 10.3969/j.issn.1006-1355.2010.01.127
Numerical simulation of a threedimensional steady turbulent flow in the overall flow field, from the inlet of the collector to the outlet of the diffuser, of a counterrotating axialflow fan is performed. Unstructured grid is used to discrete the domain for computation. Pressure boundary conditions are specified to the inlet and the outlet. The SIMPLE algorithm in conjunction with the RNG kε turbulence model is used to solve the threedimensional NavierStokes equations. The moving reference frame is adopted to transfer data across the interface between the rotating field and the stationary field. The broadband noise source model based on the Lighthill noise analogy theory is introduced to simulate the aerodynamic noise field of the fan. The sound intensity distribution inside the fan, on the impellers, the blades and the shell of the fan are predicted. The pressure fluctuation of three interfaces around impellers caused by the rotating impellers and blades vibration is studied by the Fast Fourier Transform (FFT) method. The simulation results are of important significance to the optimal design and noise control of the fan.
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