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Vortex and Noise Characteristics Analysis of the Flow-field Between the Two Impellers of a Contra-rotating Axial Fan

CHEN Qing-guang;FANG Fei;ZHANG Yong-chao;J IA Xiang-xing

2012, 32 (1): 89-92. DOI: 10.3969/j.issn.1006-1355-2012.01.021

Abstract （1779）

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The LES technique was used to simulate the 3-D unsteady full flow-field of a contra-rotating axial fan. Several monitoring faces were arranged in the flow-field between the two impellers. The monitoring points were arranged in each monitoring face. The FW-H technique was used to simulate the aerodynamic noise of the flow-field between the two impellers. The contours of vorticity magnitude of the monitoring faces and the sound pressure levels of the monitoring points were processed. The vortex and the aerodynamic noise characteristics in the monitoring faces were analyzed. This study may be useful for the analysis of fan’s aerodynamic noise.

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《Numerical Prediction of Sound Intensity and Pressure Fluctuation of Aerodynamic Noise of a CounterRotating 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

Abstract （2120）

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Numerical simulation of a threedimensional steady turbulent flow in the overall flow field, from the inlet of the collector to the outlet of the diffuser, of a counterrotating axialflow 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 kε turbulence model is used to solve the threedimensional NavierStokes 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.