喷水推进器进水流道在来流含气条件下的内部流动特性分析OACSTPCD

To investigate the internal flow characteristics in the intake duct of water-jet propulsion under the condition of gas-entrained incoming flow,taking the axial-flow water-jet propulsion machine as research object,the numerical simulation of the water-jet propulsion under different incoming gas-entrained conditions was carried out,and the distribution characteristics of the meteorological volume fraction and the unevenness change rule of each section in the intake duct under different gas-entrained incoming flow were obtained.The calculation results show that in the low speed range,the flow in the inlet channel is small,and the flow velocity is low.Affected by the geometric structure of pipeline,the fluid accumulation phenomenon at the lower elbow is obvious.As the speed is increased,the flow rate is increased,and the flow velocity is increased.The flow separation occurs at the upper elbow,which causes the accumulation area to shift to the upper elbow.Under the condition of gas-entrained incoming flow,the increasing of inlet gas content and bubble diameter can cause the interference between gas and liquid to become stronger,resulting in gas accumulation.The phenomenon is aggravated and affects the unevenness of the flow surface.