Analysis And Research On The Internal Flow Field Characteristics Of Double Screw Compressor

Because of its convenient transportion and pollution-free characteristics,air is widely used in the double screw compressor,thus the twin-screw air compressor equipment was born at the right moment,and it become the new favorite in agriculture,industry,energy and many other industries.But due to its complex internal structure and narrow space,it is difficult to measure the true air flow by experiment,which attracted a lot of industry insiders conducting research on its internal air flow characteristics.What's more,the development of modern computer technology remedy for this defect,we can process numerical simulation to the internal flow field for compressor so as to track the real gas flow within its internal effectively through the computer software.Rotor vice is the core component of screw compressor,whose movement form is mainly depend on the flow field environment the rotors are located in,the characteristics of flow field influence the movement form of rotors conversely.In order to ensure the security of the rotor system and improve the performance of screw compressor further.Established the three-dimension virtual model of the rotors through SolidWorks,done simulation calculation to the internal flow field of compressor by Fluent,and got the thermal deformation distribution of the rotors under the fluid-structure interaction,which provides foundation for reasonable compensation gap to the rotors.The main contents are arranged as followings:First,established computational domain mode for the linternal flow field of double screw compressor.Gained internal flow field calculation domain model of the compressor include:the inlet channel,the compression chamber and exhaust channel which is based on the fluid flow theory,combined with the actual operation condition of the compressor.Second,analyzed on internal flow field of the double screw compressor.Divided grid to the fluid model adopting module,setting corresponding dynamic mesh,boundary conditions and solving conditions in Fluent,finally obtained the distribution of air pressure,velocity and temperature at different time.Third,analyzed on fluid-structure coupling thermal deformation of the screw rotors.Based on the theory of fluid-structure interaction mechanics and combined with thethermodynamic principle fluid-solid coupling heat transfer model to the rotors were established,besides thermal deformation distribution of the rotor system under the effect of temperature field and force field was received.Forth,analyzed on leakage mechanism of the compressor.Analyzed on clearance distribution from the formation principle of rotor,established corresponding leakage model at the same time,put forward four kind of clearance compensation methods and illustrated by rotor machining experiment which conducted in Shaanxi Hanjiang machine tool plant.This article is based on the theory of fluid mechanics,aerodynamics,combined with the thermodynamics principle,modeling and simulation were carried out on the double screw compressor with the help of computer software,implemented the aim of tracking the internal air flow effectively.The analysis results have a certain reference value to optimizing the structure of the compressor and improving the performance of compressor.