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Acoustic performance of silencer based on temperature field and sound field coupling

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Many power plants， especially the large ship diesel engine， not only produce loud noise affecting the comfort of operators， but also the high temperature of exhaust gas。 So the spray type exhaust cooling silencer is not only to reduce noise， but also to spray cooling water making the gas temperature drop rapidly， This causes the unsteady temperature field with the temperature gradient。 Temperature gradient directly influences the sound velocity and gas density， and changed the laws of sound transmission。 In this paper， to start with， the two-dimensional finite element method is used to solve the sound transmission problem by the programming software。 Then the temperature field of the silencer is calculated by CFD method and the temperature gradient function is obtained。 The temperature gradient function is used as a boundary condition for numerical calculation。 At the same time， the calculation result is compared with the one obtained from the CFD result through grid mapping to Virtual Lab。 The comparison results are analysed。 The applicability of CFD temperature field coupled with Virtual Lab sound field is discussed。

unsteady temperature fieldtemperature field and sound field couplesound transmission

Kai Qi、Xinyu Zhang、Wenping Zhang

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Research Institute of Power Engineering Technology 145 Nantong Street, Harbin, Heilongjiang, China

International Congress and Exposition on Noise Control Engineering

Madrid(ES)

49th International Congress and Exposition on Noise Control Engineering: Advances in Noise and Vibration Control Technology

2346-2354

2020