Transient characteristics of pump-jet propelled submarine under different start-up conditions
GUO Rong1, WANG Yuan1, WANG Xiaoyu2, LI Rennian1, LI Jingsheng1
Author information+
1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Military Representative Office of Air Force Equipment Department in Xinxiang Area, Xinxiang 453000, China
In order to investigate the transient behavior during the startup phase of pump-jet thruster propelled submarine, a comprehensive full-domain unsteady numerical simulation was performed on an integrated “pump-submarine” model, utilizing the DES turbulence model, a linear startup approach was applied to assess the influence of startup duration on the internal characteristics of the pump-jet propellor and the wake flow field. The result show that, during startup, the flow rate exhibits a linear growth pattern with increasing rotational speed, while thrust and shaft power display exponential growth; furthermore, there is a gradual amplification of pressure differentials between the pressure and suction surfaces of the moving and stator cascades; the high-vorticity region undergoes a transition from being localized around the impeller blade's leading edge and hub surface to encompassing the entire flow channel; inlet backflow is progressively mitigated, and vortices manifest in various regions; the jet boundary shifts from an initial state of inconspicuous velocity gradients and nearly axisymmetric distribution to a conspicuous local velocity gradient with a “sinuous” profile; the three-dimensional vortex system in the wake field evolves from simple shear layer vortices at the jet nozzle and conical-shaped trailing vortices in the early stages of startup to a complex system encompassing core vortices, trailing-end vortices, and blade-generated vortices; with prolonged startup time, there is an overall decrease in pressure within the moving and stator cascades when reaching the same rotational speed; the distance the jet trail extends becomes increasingly extended, and the “sinuous” characteristic becomes more pronounced; the structures of the various vortex systems become more clearly defined, and the form of the tail vortices undergoes complex, irregular variations.
GUO Rong1, WANG Yuan1, WANG Xiaoyu2, LI Rennian1, LI Jingsheng1.
Transient characteristics of pump-jet propelled submarine under different start-up conditions[J]. Journal of Vibration and Shock, 2024, 43(15): 56-62
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