汽轮机动力系统通常配备两套输运管路，由安全阀门控制连通，防止动力系统在进行海上作业时出现意外事故。输运系统要在狭窄的船舶内合理布置，需要在管路中安装大量非标准连接件。这使得管路内流通的高温高压蒸汽常处于高度紊乱状态，导致强烈的气动噪声传播现象。该现象主要表现为管壁压力脉动引起的偶极子噪声源与管中蒸汽流动的内部应力导致的四极子噪声源。气动噪声在紧凑的管路中难以耗散和快速传播，使得船舶管路系统与动力系统核心部件时常遭受高周疲劳（Highcycle Fatigue）。对管路内部噪声源进行数值预测，能够预知管路中潜在危险位置，为后续零件定期检修，延长管路系统运行寿命提供帮助。

Aiming at the spatial location of the aerodynamic noise sources in the steam regulating pipe of a marine power system under different valve opening and closing conditions, a detailed numerical study of computational aeroacoustics was carried out. Shear stress transport (SST) turbulence model was used to obtain the complex threedimensional steam flow field distribution in the pipe; combined with Curle acoustic analogy model and Proudman acoustic analogy model, the distribution characteristics of dipole noise source on the pipe wall and quadrupole noise source in the fluid domain of the pipe were calculated respectively. The research result shows that compared with T type and Z type pipelines with one inlet and one outletwhen the valve is closed, the intensity of aerodynamic noise source "h" type pipeline with two inlets and one outlet increases significantly after the valve is open. Among them, the dipole noise source is mainly distributed in the pipeline convergence and the wall of outlet elbow area, which is closely related to the local fluid shear stress. The quadrupole noise source is mainly located in the outlet elbow, which is strongly related to higher turbulent kinetic energy distribution of flow field in pipe caused by suddenly becoming small of elbow diameter and the change of flow direction.

TH134

国家自然科学基金（11802177）