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| Numerical analysis of unsynchronizing motion of ring inlet valve in reciprocating compressor |
| Zhang Manlai1, Zhang Qin1, Liao Ruiquan2, Li Yong3 |
| 1.College of Mechanical Engineering, Yangtze University, Jingzhou, Hubei 434023, China; 2.CNPC Key Laboratory of Oil and Gas Production, Yangtze University, Jingzhou, Hubei 434023, China; 3.Tuha Gas Lift Technology Center, CNPC, Hami, Xinjiang 838200, China)〓〓〓 |
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Abstract In order to clarify motion characteristics of the ring inlet valve in a reciprocating compressor the expansion or suction process in the compressor was simulated with CFD approach by exploring the unsynchronizing motion of valve plates. During the unsteady flow simulations, a user defined C subroutine was composed to involve the motion functions of piston and four valve plates, displacement boun-dary conditions, impact criteria between valve plate and seat or lift limiter, displacement constrains for impact and rebound velocity boundary, eventually the displacement increments of four valve plates were determined at the end of each time step. Besides, the moving mesh technique was applied to update the mesh to realize a dynamic simulation of motion of various valve plates. Based on the mesh-independent feature identified, the effects of spring stiffness and crank shaft speed on the motion of the four valve plates and the flow rate through them were investigated. The simulated results show that the unsynchronizing motion of valve plates magnifies itself by showing different opening and closing angles from inner to outer of the plates. With increasing spring stiffness and decreasing crankshaft speed, the unsynchronizing motion among four valve plates becomes more and more evident. Additionally, the inner or the first valve plate flutters initially at the speed of 300 r/min, however, when the spring stiffness is increased to 6 000 N/m from 4 000 N/m, the second valve plate starts to flutter, and the flow rate is reduced to 0.8 times the flow rate without unsynchronizing motion. This suggests that the unsynchronizing motion must be considered when a flow rate is under determination.
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Received: 17 June 2013
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