Abstract
A numerical model is developed for the complete oil supply system of a scroll compressor. The system includes oil sump, pickup tube, oil gallery, bearings, and associated oil feed holes, vent, and port. There are two fluids, oil and gas, inside the system. The flow is numerically simulated as a heterogeneous Eulerian-Eulerian turbulent multi-phase flow. The investigation covers the entire working process of the scroll compressor from dry-start to steady state. Two design parameters, initial oil sump depth and viscosity, are studied comparatively. The detailed oil-gas flow inside the oil supply system is characterized by the field quantities. The physical mechanisms controlling oil supply rate are defined. The oil supply rate and the bearing prime time (the time after which oil is flowing through a bearing) are obtained. The results can be used to design and optimize the oil supply system to improve the reliability and efficiency of scroll compressors.
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