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The deforming computational mesh in the gerotor pump.
Features: CFD Modeling of an Internal Rotary Pump
Posted Wed November 14, 2001 @06:18PM
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Application The internal rotary pump is a positive displacement type device that is commonly used to pump the oil in an automobile engine. For a simple positive displacement device, it exhibits relatively low pulsation compared to other gear type pumps. Internal rotary pumps feature an inner gear (idler) mounted eccentrically within a larger gear (rotor). Pumping action is generated when the gear teeth unmesh, causing the gear-gear cavity to expand (inflow), and mesh, causing the gear-gear cavity to contract (outflow).

A generic internal rotary pump. (courtesy

Internal rotary pumps are used for practically all capacities and pressures. Internal rotary pumps can be operated at varying speeds and in reverse which provides a large amount of flexibility. The mechanical efficiency of internal rotary pumps when handling liquids with good lubricating value is good. Overall efficiency increases with flow rate and discharge pressure to a maximum of around 75%.

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