Simulation Analysis Of Balanced Twin Screw Compressor And Its Optimization Of Structural Parameters

Screw compressor is divided into single screw compressor and twin-screw compressor.As for twin-screw compressor, the widely used type in the current market is single-suctionnon-equilibrium type screw compressor. It’s referred to as a single-suction one instead of abalanced one, because the air pressure of its outlet greatly outweigh that of its intake, thuscausing the one-way bearing of the screw rotor inside the cavity as well as the one-waybearing of the direction of the axial force and its value is relatively high. Once suffering froma long-standing neglect, the machine will be affected either in it regular maintenance or itsservice life. What’s worse, it is very likely to cause serious dangers.A balanced twin-screw compressor has two symmetrical working cavity, with a Yinrotor, a Yang rotor and a diaphragm in between. While these two rotors have identical tooth,their directions are on the contrary to each other. While working, the axial force generated bythe symmetrical pair of rotors offset each other as to solve the unidirectional stress of therotors and its bearing parts structurally.In order to effectively improve the performance of the balanced double-suctiontwin-screw compressor such as better volume efficiency, decreased pressure fluctuation ofinternal cavity and noise caused by inlet and outlet of air, the key lies in reasonably adjustingthe structures of the screw rotors, the structure of its cavity and its flow channel. What’s more,its working process and required parameters during the movement of its compression mediumshould be ensured. Therefore, the study of the fluctuations of its characteristics during themeshing process of a balanced double-suction twin-screw compressor precisely and in anall-round way is of significant importance in the course of the development of the project.This paper focuses on the numerical simulation and verification of the balanceddouble-suction twin-screw compressor during its working process by ANSYS software.This paper used Fluent, a fluid simulation software, to simulate the value of theestablished balanced double-suction twin-screw compressor flow model and analyze itssimulation. During the data pretreatment, Realizable turbulence calculation model has beenused because of its feasibility of dealing with rotation and reflux. Then, PISO algorithm hasbeen resorted to due to its higher likeability of convergence. Moreover, precision of eachimpact factor has been increased to second-order upwind mode. When boundary conditionsare set, pressure of inlet and outlet are set in terms of the conditions of inlet and outlet;material attribute on the wall and fluid points area have been separately and hierarchically setas entities and fluid. During post-treatment of simulation, CFD-Post software is used to generate a vector velocity diagram of the mesh process, near wall flow pressure contours andtemperature contours and three section stress nephogram and temperature contours. Thispaper analyzes and compares from the perspectives of theory, chart, so on and so forth. It alsomakes conclusions and analyses about the host backflow intensity, pressure pulsation andstructure optimization of the principal machine.