Flow noise reduction of outboard valves based on internal flow path optimization

In view of the characteristics of the flow noise,created by valves of ships and submarine seawater pipeline systems,the numerical simulation of the inner flow field distribution of outboard valves was accomplished with the common computational fluid dynamics software Fluent.The reason which affects the capability and leads to the noise of hull valve was researched based on the visual results of simulation.The structure of outboard valve was improved,and a new structure of flow field was proposed,which is believed to effectively reduce the minimum pressure,increase the maximum velocity,decrease the maximum turbulent kinetic energy,eliminate eddies,and provide additional benefits to the reduction of the flow noise of outboard valve drastically.Meanwhile,a safe and smooth internal flow channel is proposed for high pressure outboard vale.Guiding suggestions for outboard valve structure and optimization of flow field are addressed.