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Image Caption

Flow streak lines in the ports and rotor colored by speed.
Lower speed is blue, and higher speed is red.

From:

Features: CFD Modeling of an Internal Rotary Pump

Posted Wed November 14, 2001 @06:18PM

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 pumpschool.com)

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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