An analysis of flow in rotary positive displacement machines has been carried out using a standard CFD package by separating out the motions of the fluid and the instantaneous volume in which it is contained. Examples are given of both twin screw and scroll compressors. Pressure-volume diagrams obtained from such analyses are compared with experimental results and good agreement shown. Longer term aims of such studies are to obtain a better understanding of the internal flow processes, especially where two component flow, such as oil/air mixtures are involved.
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