|
|
|
| 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.
|
|
Received: 13 April 2019
|
|
|
|
[1]崔宝玲, 马光飞, 王慧杰,等. 阀芯结构对节流截止阀流阻特性和内部流动特性的影响[J]. 机械工程学报, 2015, 51(12):178-184.
CUI Baoling, MA Guangfei, WANG Huijie, et al. Influence of valve core structure on flow resistance characteristics and internal flow field of throttling stop valve[J]. Journal of mechanical engineering, 2015, 51(12):178-184.(in Chinese)
[2]LIN Zhe, MA Guangfei, CUI Baoling, et al. Influence of flashboard location on flow resistance properties and internal features of gate valve under the variable condition[J]. Journal of natural gas science & engineering, 2016, 33:108-117.
[3]袁士豪, 楼盼龙, 吕剑昊. 基于熵值分析的节流阀口节流特性[J]. 排灌机械工程学报, 2015, 33(1):61-66.
YUAN Shihao, LOU Panlong, LYU Jianhao. Study on throttle performance of throttling orifice based on entropy analysis[J]. Journal of drainage & irrigation machinery engineering, 2015, 33(1):61-66.(in Chinese)
[4]ZHANG J, YANG L, DEMPSTER W, et al. Prediction of blowdown of a pressure relief valve using response surface methodology and CFD techniques[J]. Applied thermal engineering, 2018, 133: 713-726.
[5]ASIM T, CHARLTON M, MISHRA R. CFD based investigations for the design of severe service control valves used in energy systems[J]. Energy conversion and management, 2017, 153:288-303.
[6]YANG He, WANG Wen, LU Keqing. Cavitation redu-ction of a flapper-nozzle pilot valve using continuous microjets[J]. International journal of heat and mass transfer, 2019,133: 1099-1109.
[7]邹志超, 王福军, 王玲. 泵站有压输水系统启动过程中蝶阀非定常流场研究[J]. 水利学报, 2018, 49(6):678-686.
ZOU Zhichao, WANG Fujun, WANG Ling. Study on unsteady flow field of butterfly valve in startup process of driven water diversion system in pumping station[J]. Journal of hydraulic engineering, 2018, 49(6):678-686.(in Chinese)
[8]YAOBAO Y, JIAYANG Y, SHENGRONG G. Numeri-cal study of solid particle erosion in hydraulic spool valves[J]. Wear, 2017, 392/393:174-189.
[9]陆培文. 实用阀门设计手册:阀门设计手册[M].北京:机械工业出版社, 2007.
[10]章华友, 晏泽荣, 陈元芳, 等. 球阀设计与选用[M]. 北京:北京科学技术出版社, 1994.
[11]CUI B, LIN Z, ZHU Z, et al. Influence of opening and closing process of ball valve on external performance and internal flow characteristics[J]. Experimental thermal & fluid science, 2017, 80:193-202.
[12]丁欣硕, 焦楠. FLUENT 14.5流体仿真计算从入门到精通[M].北京:清华大学出版社, 2014. |
|
|
|
