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    • Study of Aerodynamic Noise of a Diesel Turbocharger Compressor Based on Acoustic Finite Element Method
    DOI：10.13949/j.cnki.nrjgc.2020.03.011
    Key Words:turbocharger  compressor  aerodynamic noise  acoustic finite element method  marine diesel engine
    Author NameAffiliation
    LIU Yang，LIU Chen，CHEN Shifan，SHEN Hua 1.Chongqing Jiangzeng Shipbuilding Industry Co., Ltd., Chongqing 402263, China； 2.College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China 
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    Abstract:In order to study the aerodynamic noise of a marine low-speed diesel turbocharger compressor, a hybrid calculation method of the computational fluid dynamics(CFD) and acoustic finite element method(FEM) was used to predict it, and verified by bench test. The unsteady flow field in the compressor was calculated under three different operating conditions, where the pressure fluctuation was used as a noise source in the acoustic simulation. Results indicate that the hybrid calculation method has a higher calculation accuracy and can be used for numerical prediction of the compressor's aerodynamic noise. Moreover, the main components of aerodynamic noise at the compressor inlet include discrete tonal noise and broadband noise. As observed, the discrete tonal noise exhibits an obvious acoustic directivity at blade passing frequency(BPF) and has two prominent peaks.
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