Analysis of influencing factors and prediction of aeroacoustic noise induced by cruise chimney exhaust pipelinene
[Objectives]This study analyzes the influencing factors of the aeroacoustic noise of cruise ship chimney exhaust pipelines,and predicts the noise level in the open area of a domestic cruise ship.[Methods]A hybrid approach combining Large Eddy Simulation and Lighthill Analogy is used to conduct a numerical sim-ulation of the pipeline's aeroacoustic noise under the actual working conditions of a cruise ship.The impacts of the inlet flow rate,outlet pressure,cross-section shape and bending angle on the aerodynamic noise are stu-died.A real-size cruise ship chimney exhaust pipeline model is then established to analyze the main noise sources and predict the noise level in the open areaa.[Results]The results show that the larger the inlet ve-locity and bending angle,the greater the aeroacoustic noise.Furthermore,the aeroacoustic noise of a pipeline with a zero pressure-outlet is greater than that with a non-zero pressure-outlet.It is also found that the aeroacoustic noise of a rectangular cross-sectional pipeline is marginally smaller than that of a circular one.In addition,the narrowband peak frequency decreases as the bending angle increases.Except for the chimney out-let,the noise level in the open area is low.[Conclusions]This study has significant reference value for con-trolling the aeroacoustic noise of cruise ship chimney exhaust pipelines and improving passenger comfort in open areas.
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