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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
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Abstract: Aiming at the problems of interference, wear and locking of twin-screw compressor rotor in working process,a bidirectional computational fluid dynamics(CFD)/computational structural dynamics(CSD)fluid-solid coupling calculation method was proposed,and the strength and vibration characteristics of screw structure of twin-screw compressor under one-way and two-way fluid-solid coupling were studied.Firstly, based on the N-S equation and the k-ε turbulence model, the aerodynamic load was obtained by solving the compressor flow field through the finite volume method. In the system coupling, the aerodynamic load was taken as the external load of the screw through the conservation interpolation method, and the displacement field was obtained by solving the balance equation of the screw structure.Then, the displacement field was applied on the flow field, and the data exchange between the flow field and the structure field was repeatedly realized. Finally, after the convergence of the flow field and the structure, the displacement, stress and modal distribution of the screw were obtained. The results show that the distribution trend of compressor flow field pressure is the same as that of pneumatic load on screw. The deformation and stress of the screw under bidirectional fluid-solid coupling are greater than those under unidirectional fluid-solid coupling, and the rotation speed of 14880r/min corresponding to the first-order modal frequency of the screw under two kinds of coupling is much higher than the maximum rotation speed of the screw, so resonance will not occur. It can provide a new idea for the structural optimization of screw compressor.
Key words: screw compressor; mechanical strength; computational fluid dynamics(CFD); computational structural dynamics(CSD); vibration performance; displacement field; deformation and stress
HOU Xuan.Rotor strength of twin-screw compressor with two-way fluid-structure coupling[J].Journal of Mechanical & Electrical Engineering,2023,40(7):1130-1136.
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