Simulation for VIV of high pressure drop labyrinth-sleeve combined regulating valves

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (3) : 95-103.

LI Shuxun1,2, ZHANG Wannian1,2, WANG Weibo1,2, XU Xiaogang1,2, ZHU Lu1,2

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Abstract

Aiming at vortex-induced vibration (VIV) phenomena of high pressure drop type regulating valves, a high pressure drop regulating valve with combination of multi-channel labyrinth discs and multi-stage sleeves was designed.Based on CFD and the fluid-structure coupled modal analysis, inner transient flow field and structural modes of the valve were calculated to obtain its 3 typical open fluid flow cases, lift coefficient’s time domain and frequency domain characteristic curves as well as modal frequencies and modal shapes.The results showed that at 4 s time instant, with decrease in the valve’s opening, the maximum flow velocity of fluid decreases, and large vortex in outer flow channel of the fourth-stage sleeve gradually forms small one; fluctuation of fluid lift coefficient during the valve being fully open is more violent than those during the valve having 70% and 40% openings, the 1st and 2nd order modal frequencies of the valve increase with increase in valve opening; the valve’s modal frequencies don’t fall in range of vortex shedding main frequency, the valve can’t have VIV locking phenomenon.

Key words

high pressure drop / labyrinth sleeve / computational fluid dynamics (CFD) / transient flow field / vortex-induced vibration (VIV)

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LI Shuxun1,2, ZHANG Wannian1,2, WANG Weibo1,2, XU Xiaogang1,2, ZHU Lu1,2 . Simulation for VIV of high pressure drop labyrinth-sleeve combined regulating valves[J]. Journal of Vibration and Shock, 2020, 39(3): 95-103

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