ANALYTICAL AND EXPERIMENTAL STUDY OF HIGH SPEED ROTARY SLIDING VANE COMPRESSOR DYNAMICS WITH APPLICATION TO TRANSFER SLOT DESIGN
Abstract
In this study a mathematical computer simulation was developed which is capable of being used to study the influences of the transfer slot on the work of compression in rotary sliding vane compressors. In the process of developing this simulation model, several new items which were not present in previous simulation models were incorporated. Among these were (1) consideration of the transfer slot-discharge port combination and the chamber preceding the throat section as two distinct chambers during the majority of the cycle of operation, (2) a method of modeling a discharge valve whose midplane is in the shape of a circular cylindrical surface, and (3) an alternative to the traditionally used quasi-steady flow model which considers the inertia of gas in restrictions. The developed flow model and valve model along with the polytropic process relation and a formulated set of volume equations were assembled into an overall simulation of the cycle of operation of the compressor. The outputs from this simulation were (1) pressure histories in the chambers formed during rotor rotation, (2) valve displacement history, and (3) theoretical energy input of the rotor. In order to verify the simulation, an operating compressor was instrumented with pressure transducers to obtain pressure histories in chambers and a displacement transducer to monitor valve deflection. Comparison of pressure and valve histories predicted by the simulation model to those from experiment indicated that the simulation is capable of adequately predicting the pressure and valve histories. Subsequently, the simulation model was used in parameter variations of the transfer slot geometry and shown to be capable of minimizing the work of compression with respect to a given parameter. From these parameter variations it was concluded that angular location, depth, and width of the transfer slot have in general important influences on power consumption, but variations of the magnitude of production tolerances are of negligible influence.
Degree
Ph.D.
Subject Area
Mechanical engineering
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