Depressurization stage number of disc in high pressure drop labyrinth control valve
Li Shuxun1,2, Hou Yingzhe1,2, Xu Xiaogang1,2, Hu Jian3, Hao Jiaoshan3
1.College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Center of Engineering and Research for Pumps and Special Valves in Machinery Industry, Lanzhou, Gansu 730050, China; 3.Chongqing Chuanyi Control Valve Co. Ltd., Chongqing 400700, China
Abstract：How to confirm depressurization stage number on disc is the key design problem for high pressure drop labyrinth control valve. According to the compressible fluid dynamic theory, the calculation formula of depressurization stage number on disc was deduced and analyzed. Numerical simulation of the internal flow in three path models with different stage number were performed by using commercial software CFX, and the distribution of pressure and velocity were obtained, while the changing curve were analyzed. The results show that increasing the stage number is beneficial to reach smooth depressurization and equally distribute pressure, as well as to reduce velocity and outlet energy. In addition, it′s useless to increase the stage number if the path model has been satisfied with the outlet energy criteria. This study could be used as a reference for design of labyrinth control valve.
李树勋,, 侯英哲,, 徐晓刚,, 胡建, 郝娇山. 高压差迷宫式调节阀盘片降压级数[J]. 排灌机械工程学报, 2013, 31(12): 1072-1076.
Li Shuxun,, Hou Yingzhe,, Xu Xiaogang,, Hu Jian, Hao Jiaoshan. Depressurization stage number of disc in high pressure drop labyrinth control valve. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(12): 1072-1076.
[1]吴杰.低噪音迷宫调节阀设计[J].阀门,2000(4):6-8. Wu Jie. Labyrinth regulating valves with low noise [J]. Valve, 2000(4): 6-8.(in Chinese)[2]张小兵. KOSO-VeCTor 系列流速控制阀的特点及其应用[J].中国仪器仪表,2009(9):94-96. Zhang Xiaobing. The feature and application of KOSO-VeCTor series control valve [J].China Instrumentation, 2009(9): 94-96.(in Chinese)[3]Kwon W C,Kim G R,Park S C,et al. Design of a tor-tuous path trim for a high-pressure turbine bypass valve [J]. Process Mechanical Engineering, 2010, 224(2): 149-153.[4]Miller H L. Piping vibration involving control valves [C]//Proceeding of 2001 International Joint Power Generation Conference. New Orleans, USA:ASME, 2001(2):241-248.[5]Miller H L, Samy S. Cavitation testing of a multi-path multi-stage control valve [C]//Proceeding of Valve World Conference and Expo.Netherlands:[s.n.], 2006:1-8.[6]Zhang Jun, Zhao Wanhua, Tang Yiping. Structural optimization of labyrinth channel emitters based on hydraulic and anti-clogging performances [J]. Irrigation Science, 2011, 29(5): 351-357.[7]Miller H L, Stratton L R. Fluid kinetic energy as a selection criteria for control valves [C]//Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting. Vancouver, Canada: ASME, 1997:1-8.[8]金多文.迷宫式调节阀及其在电厂中的应用[J].水利电力机械,2001,23(1): 9-13. Jin Duowen. The concept and applications of labyrinth regulating valves in power station [J]. Water conservancy & Electric power machinery, 2001, 23(1): 9-13.(in Chinese)[9]Thompson P A. 可压缩流体动力学[M]. 北京:科学出版社,1986.[10]江伟,郭涛,李国君,等. 离心泵流场流固耦合数值模拟[J].农业机械学报,2012, 43(9):53-56. Jiang Wei, Guo Tao, Li Guojun, et al. Numerical calculation on flow field in centrifugal pump based on fluid-structure interaction theorem [J]. Transactions of the Chinese Society for Agricultural Machinery, 2012, 43(9):53-56.(in Chinese)[11]李树勋,徐登伟,李确,等.倒吊桶先导式蒸汽疏水阀的设计与数值模拟[J]. 排灌机械工程学报, 2012, 30(3):347-350. Li Shuxun, Xu Dengwei, Li Que, et al. Design and numerical simulation of inverted bucket pilot-operated steam traps [J]. Journal of Drainage and Irrigation Machinery Engineering, 2012, 30(3):347-350.(in Chinese)[12]杨敏官,张宁,李忠,等. 基于CFD的离心泵侧壁式压水室优化设计[J]. 江苏大学学报:自然科学版, 2013, 34(1):28-32. Yang Minguan, Zhang Ning, Li Zhong, et al. Optimal design of centrifugal pump with tilt volute based on CFD [J]. Journal of Jiangsu University:Natural Science Edition, 2013, 34(1):28-32.(in Chinese)[13]谢龙汉,赵新宇,张炯明. ANSYS CFX流体分析及仿真[M]. 北京:电子工业出版社,2012.[14]Youn C, Asano S, Kawashima K, et al. Flow characteri-stics of pressure reducing valve with radial slit structure for low noise [J]. Journal of Visualization, 2008, 11(4): 357-364.
