Optimization Design And Analysis Of The Rotor Profile Of Twin Screw Compressor

Due to its advantages of compact structure,high reliability,high speed,strong balance and wide adaptability,the twin screw compressor is not only used in the construction,food,chemical,pharmaceutical,metallurgy and other industries to provide compressed gas,but also used in industrial refrigeration,Air-conditioning refrigeration and vehicle supercharger,the market share of the compressor continues to expand.In the twin-screw compressor,the intermeshing male and female screw rotors are the most important components,and the rotor profile is the key to forming the rotor.With the continuous improvement of the performance of the twin-screw compressor rotor profile,the performance of the twin-screw compressor is improved.Significantly increased and rapidly expanded market share.Therefore,the research of rotor profile has always been the focus of attention.But our country’s current research on the rotor profile of twin-screw compressors has not yet made outstanding products facing the competitive market.In this paper,based on the study of the rotor profile of the twin screw compressor,the cubic B-spline is applied to the design of the rotor profile and contact line,the rotor profile is expressed by the cubic B-spline,and the contact is optimized by building an optimization model The line length achieves the purpose of rotor profile optimization and improves the performance of the twin screw compressor rotor.Based on CFD simulation analysis,the compressor performance before and after rotor profile optimization is compared.Finally,the correctness and reliability of theoretical research and simulation analysis are verified by experiments the specific research contents are as follows:(1)This paper analyzes the working process of the twin screw compressor,on this basis,studies the elements and principles of rotor profile design,further clarifies the method of solving the rotor profile,conjugate curve and envelope conditional expression,and then The geometric characteristics that affect the performance of the rotor are studied,and the solution methods of the rotor performance parameters such as rotor contact line,inter-tooth area and area utilization coefficient are analyzed,which lays the foundation for the design of the three B-spline rotor profile in this paper.(2)On the basis of studying the basic theory and fitting method of cubic B-spline,this paper studies the application of cubic B-spline curve in the design of rotor profile and contact line,and expresses the rotor profile with the help of cubic B-spline And,based on the cubic B-spline curve,the rotor conjugate curve and contact line design method were studied,which provided a theoretical basis for the optimal design of the subsequent cubic B-spline rotor profile.(3)In the optimization design of the rotor profile,the mathematical model of the cubic B-spline rotor profile optimization is established,and the Fmincon function in Matlab is used to optimize the rotor’s cubic B-spline contact line and obtain the optimized cubic B-spline rotor profile and its conjugate curve were compared and analyzed.(4)Based on the related theories of fluid dynamics,the factors that affect the working performance of the compressor are deeply analyzed,including: pressure field and velocity field,revealing the flow law of the internal flow field of the compressor.The compressor performance of the optimized rotor profile and the original profile were simulated and compared,and the flow field characteristics of the two were analyzed.Finally,the reliability of the theoretical analysis and simulation results was tested through experiments.The study of compressor rotor profiles provides a reliable method.