Abstract
The screw compressor in the early stage of development is generally known as the oil-injection type. However, escalating environmental problems and advances in electronic components have spurred continuous R & D to minimize the oil content in compressed air. The oil-free twin-screw compressor is continuously compressed by inner volumetric change between rotors and casing. For this reason, in order to predict the overall performance of the screw compressor at the early stage of the design process, industry still relies on the empirical method. However, it is difficult using the existing empirical method to gain more information of the inner fluid flow of the twin-screw compressor. Flow simulation techniques using CFD are required. This study presents applications of a recently proposed overset grid method to the solution of the flow around a moving boundary. In order to analyze the performance of a 4 × 6 oil-free screw compressor, the 3-D, unsteady and compressible flow fields were numerically calculated with a shear stress transport (SST) turbulence model, and implemented by the commercial software, Star-CCM+. The pressure distributions were calculated and graphically depicted. Results also showed that the volumetric and adiabatic efficiencies of the screw compressor measured by the experiments were 78% and 71%, respectively.
Highlights
A screw compressor is provided with a male rotor and female rotor, which intermesh with each other when they rotate
In order to improve the performance of the screw compressor, a designer is faced with various problems
The experimental model ofmodel this study showed that the that cooling that wasthat installed installed cooled the working fluid during the compression process, resulting in a measured value installed cooled the fluid working fluid the compression process, in value a measured cooled the working during theduring compression process, resulting in resulting a measured that wasvalue close that was close to the isothermal process
Summary
A screw compressor is provided with a male rotor and female rotor, which intermesh with each other when they rotate. These screw rotors are asymmetrical in their contour, and usually have quite complicated profiles. A screw rotor profile usually contains various kinds of functions, and it consists of mostly circular, Background cycloid, and arc curves. A screw rotor profile usually contains various kinds of functions, and it consists of mostly system,circular, which cycloid, is fixedand to arc thecurves. The rotor conversion formula ofthe thefemale x-y and u-vthe coordinate in R f Rm. Equation [13,14]: in the x-y plane. # [13,14]: systems is defined in Equation (1)
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