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Streamline Computation Study on Rotation Aerodynamic Noise Prediction of Cross-flow Fan

  • ATMOSPHERIC AND AEROACOUSTICS
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Abstract

The approach of resolving analysis the cross-flow relative motion streamline on the cross-flow straight blade is presented to predict the rotation aerodynamic noise performance of cross-flow fan by solving the dipole source term of Ffowcs Williams and Hawkings equation, while the cross-flow fan is applied in the indoor unit of split-type air-conditioner and operated in the rated condition. The calculating results of the method are respectively drawn by programming in Matlab computational language, and compared with the results of CAA numerical simulation and noise experiment. There are some differences in the distribution condition of aerodynamic force fluctuation amplitude on the blade surface, and sound pressure in the related frequency on the indoor unit casing, or on the sphere far field, between the streamline computation approach and numerical simulation. The orders of magnitudes of these calculating results solved by the analysing streamline method are similar with that attained by the numerical simulation. The resolving analysis approach has the characteristics of decreasing the computing cost and not constructing the acoustics grid model of fan, compared with the numerical simulation. The error between the result of numerical simulation and noise test is larger than that between the result of theoretical calculation and noise test, so the approach could be used for the rotation aerodynamic noise analysis of the cross-flow fan.

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ACKNOWLEDGMENTS

The author thanks Fluid Machinery Laboratory of Huazhong University of Science and Technology for helping the author to take the noise experiment of the cross-flow fan.

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Authors and Affiliations

  1. School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China

    Hui Li

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  1. Hui Li
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Hui Li Streamline Computation Study on Rotation Aerodynamic Noise Prediction of Cross-flow Fan. Acoust. Phys. 65, 418–431 (2019). https://doi.org/10.1134/S1063771019040110

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  • DOI: https://doi.org/10.1134/S1063771019040110

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