二回路冷却系统通海管路-艇体流固耦合噪声特性分析OA

To investigate the influence of pipe support stiffness in the secondary loop cooling system on the flow-induced noise and flow-induced vibration noise of the seawater piping,taking the fluid in the secondary loop cooling system and a simplified model of seawater piping-hull as the research object,the flow field of the seawater piping and the vibration response of the hull under four different pipe support stiffnesses were calculated using a two-way fluid-structure interaction method.Based on this,the pulsating pressure in the piping flow field and hull vibration data were used as excitation sources.Combined with acoustic boundary element method,the flow-induced noise of the sea-water piping and the flow-induced vibration noise of the hull were calculated and analyzed.The research results indi-cate that:the flow-induced noise of the seawater piping decreases gradually with the increase of pipe support stiff-ness;reducing the support stiffness of the piping near the seawater inlet cannot effectively suppress the flow-induced vibration noise of the hull,and may easily increase the overall sound radiation of the secondary loop cooling system.Therefore,the piping near the seawater inlet section should adopt connection methods with larger support stiffness.