Effects of valve body clearance on valve performance and internal flow field distribution
MA Guangfei1,2,3,4*, JI Jiankang1, YAO Dan3, JIANG Chao1, FANG Yong1
1. Standard & Quality Control Research Institute, Ministry of Water Resources and Hangzhou Machine Design & Research Institute, Ministry of Water Resources, Hangzhou, Zhejiang 310012, China; 2. National Joint Engineering Laboratory of Fluid Transfer System, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China; 3. International Centre on Small Hydropower, Ministry of Water Resourcos, Hangzhou, Zhejiang 310002, China; 4. Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, Sichuan 610039, China
Abstract：Three-dimensional numerical simulations of the flow in a ball valve-pipe channel model with and without clearance are carried out based on the finite volume method and standard k-ε turbulence model to study effects of ball body clearance on hydraulic performance and internal flow characteristics of ball valve. The results show that the flow coefficient, resistance coefficient, pressure reco-very coefficient and cavitation coefficient of ball valve are relevant to ball body clearance. Specially, these coefficients all vary significantly with valve opening angle as it is over 40-50°. This is because there is a large local pressure zone and two symmetrical, separated vortices downstream of the ball body. The ball body clearance influences the distributions of pressure, velocity and vortex downstream of the valve but also makes the flow pattern even more complicated. Moreover, the valve opening angle has a certain influence on the pressure distribution in a cross-section of the valve. In consequence, for accurately predicting the hydraulic performance of a ball valve the clearance should not be ignored by simplification treatment, instead the influence of the clearance on the performance and internal flow field must be taken into account.
马光飞,,,*,季健康,姚丹,蒋超,方勇. 阀体间隙对球阀性能和内部流场分布的影响[J]. 排灌机械工程学报, 2019, 37(11): 960-966.
MA Guangfei,,,*, JI Jiankang, YAO Dan, JIANG Chao, FANG Yong. Effects of valve body clearance on valve performance and internal flow field distribution. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(11): 960-966.
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