The Transient Pressure Characteristic of a Positive Displacement Vane Pump

Abstract

The precompression and load pressure characteristics of a fixed displacement vane pump are studied both experimentally and theoretically for the pump in its new condition and for two different working fluids. Conventional mineral oil and a 60 per cent oil-40 per cent water emulsion are both considered for a range of pump load pressures. Flow losses are shown to be non-linear and an appropriate mathematical model is developed to embrace this characteristic with the two-displacement geometry design of the pump. The mathematical model is refined to include vane intermediate pressure effects, leading to slightly better performance prediction, and the comparison with measurements is shown to be promising, particularly for the precompression part of the cycle.