Numerical simulation for suitable working conditions of surface-textured plunger based on CFD
HU Song1, ZHANG Xinming2, ZHENG Long1*, REN Luquan1
1. Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, Jilin 130022, China; 2. College of Mechanical and Electrical Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, China.
Abstract：The flow field between barrel and plunger with textured-surface in a pumpjack was investigated numerically by using CFD method and effects of size of the gap between the barrel and the plun-ger and pressure difference on pumpjack oil leakage flow ratio, load-carrying capacity ratio and friction coefficient ratio were analyzed. Results show that the texture on the plunger surface affects the pressure and velocity fields in the gap. Under the same pressure difference, the oil leakage flow rate and oil mean velocity in the gap increase with increasing gap size. As a result, the influence of the texture on the velocity and pressure fields gets dominated, resulting in a decrease in both leakage flow ratio and friction coefficient ratio, and an increase in load-carrying capacity ratio. For the same gap size, with the increase of pressure difference, the pressure gradient in the gap rises, and the mean velocity becomes fast. Due to the influence of texture on the flow field, the leakage flow rate and friction coefficient ratios decrease but the load-carrying capacity ratio increases. This suggests that surface-textured plungers should be applied in oil fields properly. A bigger gap size and a larger pressure difference will allow the surface texture to demonstrate a resisting effect on the oil fully. In sequence, oil leakage through the gap can be reduced effectively and wear of the plunger can be mitigated to achieve the objectives such as improvement of pump efficiency and prolonging service life-span of the plunger.
胡嵩,张心明,郑龙*,任露泉. 基于CFD织构表面柱塞适用工况的数值模拟[J]. 排灌机械工程学报, 2019, 37(9): 746-751.
HU Song, ZHANG Xinming, ZHENG Long*, REN Luquan. Numerical simulation for suitable working conditions of surface-textured plunger based on CFD. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(9): 746-751.
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