Experimental Research and Numerical Analysis of Pressure Fluctuation Characteristics of Rim Driven Propulsion Pump Outlet

The pressure fluctuation characteristics of a rim driven propulsion pump are studied by an experimental method firstly, and then its unsteady inner flow is numerical simulation to reveal the generating mechanism fluctuation. In experiment, monitoring point was set in downstream region with distance 1D (D, Diameter impeller) impeller. point’s dominant frequencies within low frequency band 1APF (APF, Axial Passing Frequency) 2APF. simulation, main near impeller appears at 1BPF (BPF, Blade as moves downstream, amplitude becomes smaller. nearly disappears when exceeds 1D, 2APF, which good agreement results band. transient velocity, vorticity distribution were causes 1BPF, 2APF cause jet from tail blade movement large-scale double vortex structure on both sides low-pressure zone. group wall may be that induces