To solve problems of leakage, vibration, and noise caused by disorders of flow field distribution and working pulsation in the\nrotating-sleeve distributing-flow system, governing equations of plunger and rotating sleeve and computational fluid dynamics\n(CFD) model are developed through sliding mesh and dynamic mesh technology to simulate flow field and working pulsation.\nSimulation results show that the following issues exist: obviously periodic fluctuation and sharp corner in flow pulsation, backward\nflow when fluid is transformed between discharge and suction, and serious turbulence and large loss in kinetic energy around\nthe damping groove in transitional movements. Pressure in the pump chamber rapidly rises to 2.2MPa involving over 10% more\nthan nominal pressure when the plunger is at the Top Dead Center (TDC) considering changes about damping grooveââ?¬â?¢s position\nand flow area in two transitional movements. Shortly pressure overshoot gradually decreases to a normal condition with increasing\nflow area. Similarly, pressure in the pump chamber instantaneously drops to a saturated vapor pressure âË?â??98.9 KPa when the plunger\nis at the Bottom Dead Center (BDC). With increasing flow area the overshoot gradually increases to the normal condition. This\nresearch provides foundations for investigating flow field characteristic and structure optimization of rotating-sleeve distributingflow\nsystem.
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