Abstract
A numerical three-dimensional CFD analysis of a variable displacement vane pump has been conducted, investigating the effects on the pressure ripple caused by the vane detaching from the pressure ring. The volume of the fluid over the vane tip has been re-meshed at every time step as a function of the forces acting on the bottom and the top of each vane. The numerical model has been developed using the commercial tool, Simerics MP+, including turbulence and cavitation models. The validation of the model has been done comparing numerical and experimental data. It has been observed that the detachment of the vane occurs during the transition zones when unwanted pressure spikes are generated by a nonoptimized valve plate design. The prediction of vane detachment is crucial for designing a quieter and more durable pump. Vane collision on the stator ring can be a source of noise producing premature wear of both components. Vane detachment from the stator ring has a large effect on pressure ripple even if the volumetric efficiency is only slightly influenced.
Highlights
Geist et al [2] analyzed a vane pump used for lubrication of an internal combustion engine
An accurate numerical model has been built to account for the effect of eccentricity rate of change on the internal forces and torques acting on the variable displacement mechanism within a pivoting vane pump
A Computational Fluid Dynamics (CFD) numerical model has been developed showing that pump speed has a greater influence than eccentricity on internal forces, and that the maximum value of the internal moment occurs at high speeds and maximum eccentricity
Summary
Geist et al [2] analyzed a vane pump used for lubrication of an internal combustion engine. A three dimensional CFD numerical models has been previously developed by the team [7,8] with good results, but the approach had critical issues that influences construction and calculation times For this reason, a faster methodology using a lumped approach. The clearance around the stator ring depends on manufacturing tolerances To remove this clearance, a screw alters the thrust block position, an offset perpendicular to the pump eccentricity (later called Y-offset). The Y-offset can be positive or negative, affecting the maximum and minimum volume angular position of the displacement between vanes, shifting the valve plate timing [4 - 5] This can cause an unwanted premature closing of the delivery kidney reducing the effective pump displacement below the nominal geometrical displacement from the manufacturer. To create a more accurate numerical model, the authors measured the Y-offset before the pump tests, and considered it in the numerical model
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