Basic design procedure for an internally geared screw compressor

The internally geared gerotor type of positive displacement machine is widely used for pumping applications, but can also be to achieve internal compression or expansion a working fluid. A further development this configuration the application helical twist inner and outer rotors. Previous studies have shown that decrease power transferred between rotors, increase relative maximum flow areas at inlet discharge ports. There are possible benefits when compared conventional twin-screw machines, including reduced leakage area, stiffer co-directional thermal However, no experimental data currently available configuration, optimising geometry screw requires detailed understanding porting, flows mechanical losses. An programme being conducted investigate influence these factors on performance. This paper discusses preliminary results from geometrical analysis leading simple design procedure. basic an air compressor demonstrated, based operation characteristics twin machine.