船用燃气轮机进气管道声辐射特性计算与分析

Calculation and analysis of acoustic radiation characteristics of marine gas turbine intake ducts

动力装置的进排气系统噪声研究多集中在进排气管口声辐射问题,鲜有研究关注管道壁面本身的声辐射问题。针对大型船用燃气轮机进气管道的声辐射问题,本文分别使用解析计算和数值计算方法,分析了在燃气轮机噪声源激励下进气管口的声辐射和管壁振动引起的舱室内辐射声场。研究表明:加大管道尺寸和增大管道壁厚均可降低管壁引起的舱室噪声;在不采取控制措施的情况下,该进气管道相邻舱室内的噪声可高达89dBA;在管道壁面采取声包覆手段可有效降低舱室内的辐射噪声。

Most of the studies on the noise of intake and exhaust system of power plant focus on the sound radiation of intake and exhaust pipe ports,and few studies focus on the sound radiation of the pipe wall itself.In this paper,based on analytical and numerical calculation methods,we analyze the sound radiation at the inlet and the radiation field in the cabin caused by the vibration of the pipe wall under the excitation of the gas turbine noise source.The study shows the following conclusions.Increasing the pipe size and wall thickness can reduce the cabin noise caused by the pipe wall.Without control measures,the noise in the adjacent cabin of the inlet pipe can be as high as 89 dBA.Adopting acoustic cladding on the pipe wall can effectively reduce the radiation noise in the cabin.