Abstract
High-temperature gas will cause stress and deformation of the rotor during the operation of the twin-screw compressor, which will affect the structural performance of the screw rotor. Based on the CFD/CSD coupling solution technology, the method of thermal solid numerical analysis is developed. The fluid control equations are time-averaged differential equations, and the turbulence model is a two-equation Realizable K-ε model. The thermal deformation and thermal stress of the rotor are obtained by solving the structural static equilibrium equation. The reliability of the proposed method is verified by solving the thermal deformation of the L-shaped large-diameter buried pipeline. Finally, the thermal deformation and thermal stress of the rotor under different exhaust pressures and different speeds are mainly studied. Through simulation analysis, the variation law of rotor deformation, stress and modal under different temperature fields of the compressor is obtained, which can provide a certain theoretical reference for the compressor structural design and optimization.
Highlights
In recent years, with the rapid development of Chinese economy, huge progress has been made in construction, industrial manufacturing, cold chain logistics and other fields
Cao et al [16] based on the theory of elastic mechanics and finite element method, used the first type of thermal boundary conditions to analyze the three-dimensional steady-state temperature field of the rotor, solving the problem that the deformation of the 3D screw rotor can only be simplified to 2D calculation for a long time
Considering the coupling effect of the temperature field generated by the compressor and the screw rotor, under the working condition of 0.2-0.4 MPa, the maximum stress of the female rotor decreases with the increase of the rotating speed
Summary
With the rapid development of Chinese economy, huge progress has been made in construction, industrial manufacturing, cold chain logistics and other fields. Long et al [12] used STAR-CCM+ software to simulate the internal flow field of the screw compressor, and proved that the pressure value of the flow field in the compressor periodically changed with time He et al [13] increased the meshing clearance and tooth clearance of the twin screw compressor rotor to millimeter level through ANSA and Fluent software, which provided a method for accurately analyzing the pressure change of the flow field in the compressor. Cao et al [16] based on the theory of elastic mechanics and finite element method, used the first type of thermal boundary conditions to analyze the three-dimensional steady-state temperature field of the rotor, solving the problem that the deformation of the 3D screw rotor can only be simplified to 2D calculation for a long time. The influence of the compressor temperature field on the rotor structure is studied by solving the rotor structural static balance equation
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