Key Technology Research And CFD-based Simulation Of The Single Screw Compressor

The single screw compressor is a new type of screw compressor，whichdevelopes in abroad in70th，mainly depending on the accurate mesh of the stars andscrew to carry out its work process..In the domestic，only a few factories can producethis type of compressor，and a lot of problems should to be resolved in theory andpractice. The inner flow in single screw compressors is very complex, which affectscompressor performance directly，so it’s significant to research the inner flow withCFD software. Because CFD can greatly shorten the mechanical design, optimization,validation and production cycles, so making use of CFD software has become animportant research means in recent yearsIn this paper, and the main research works of single screw compressor arecompleted as following.Based on the principle of differential geometry and classical meshing theory，aseries of formulas have been deduced in this paper,such as the meshingcharacteristics of screw and gators of the single screw compressor,left and right spiralgroove surface equations of screw, meshing equations of inverse envelope of gatorsand surface equations of gators.The geometry parameters of the single screw compressor were confirmed.Combined with the software UG and matlab, the3D solid models of screw and gatorswere established, the plastic model of screw and gators were completed inprojet3Dsystem SD3000.The internal flow field model of single screw compressor was extracted, whichcan be divided into two parts: the spiral groove and the pipe flow. Using dynamicmesh and moving mesh simulates the internal flow of spiral groove and the pipe flow.then, the velocity field, pressure field and temperature field changes of compressorwere analyzed.The testing platform of single screw compressor was accomplish in laboratory,which can measures the temperature，pressure, speed of single screw compressor in5different operating conditions, then, compared with the experimental data and theoutcomes of simulation, which prove the simulation is correct and feasible.