大口径活塞套筒式调流调压阀流动特性分析
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摘要
调流调压阀用于实现管线不同流量和压力工况的转换,其良好的调节性能和流动特性对管道系统的高效运行意义重大。本文以2400LT-41X-10Q型大口径活塞套筒式调流调压阀为研究对象,通过数值分析软件Fluent结合RNG k-ε湍流模型及动网格,研究了不同开度下稳态工况及开、关阀过程中瞬态工况的流动特性。结果表明,由于活塞套筒的运动产生阻流作用,故开阀和关阀的动态流量系数均小于稳态值,而对应的动态流阻系数则均大于稳态值。同时,对应开阀和关阀过程,活塞套筒将受到反向的瞬态侧向力,且以轴向力为主。因固定套筒的需要,在全开度附近保留了一段空行程,使得竖向和水平的侧向力在该开度下出现了陡升的峰值,可能影响阀门驱动机构的操作或引起阀门的卡塞。另外,通过对比不同阀门开度下的阀内流速、压力、湍动能和湍流耗散率等流场分布来对该其工作原理和流动特性进行说明。分析结果为活塞套筒式调流调压阀的选型和使用提供了参考。
Various flow and pressure conditions of pipeline can be adjusted by the flow and pressure regulating valve whose hydraulic regulation performance and flow characteristics greatly influence the efficient operation of pipeline system. In this research,the large-diameter flow and pressure regulating valve with piston sleeve of 2400 LT-41 X-10 Q type was investigated by the CFD code Fluent,combined with RNG k-εturbulence model and dynamic mesh. And flow characteristics of the valve was analyzed by comparing the steady-state conditions in different valve openings as well as transient conditions of the opening and closing processes. The results indicate that the dynamic flow coefficients in opening and closing processes are both less than the corresponding static flow coefficients in steady-state conditions,while the dynamic resistance coefficients are larger than the static ones instead, which is caused by the flow obstruction from piston sleeve movement. Corresponding to the opening and closing processes respectively,opposite transient lateral forces will exert on the piston sleeve and the force component in axial direction is significantly greater than those in other two directions. Due to the vacant travel used for fixing the sleeve near full valve opening,the lateral forces in vertical and horizontal direction will get to their peak magnitudes,which may influence the operation of driving mechanism or make the piston sleeve get stuck in these directions. Moreover,flow field distributions of velocity,pressure,turbulent kinetic energy and turbulent dissipation rate in different openings were compared to illustrate operation and flow characteristics of the flow and pressure regulating valve. The analysis results provide a guidance for selection and utilization of the flow and pressure regulating valve with piston sleeve.
Various flow and pressure conditions of pipeline can be adjusted by the flow and pressure regulating valve whose hydraulic regulation performance and flow characteristics greatly influence the efficient operation of pipeline system. In this research,the large-diameter flow and pressure regulating valve with piston sleeve of 2400 LT-41 X-10 Q type was investigated by the CFD code Fluent,combined with RNG k-εturbulence model and dynamic mesh. And flow characteristics of the valve was analyzed by comparing the steady-state conditions in different valve openings as well as transient conditions of the opening and closing processes. The results indicate that the dynamic flow coefficients in opening and closing processes are both less than the corresponding static flow coefficients in steady-state conditions,while the dynamic resistance coefficients are larger than the static ones instead, which is caused by the flow obstruction from piston sleeve movement. Corresponding to the opening and closing processes respectively,opposite transient lateral forces will exert on the piston sleeve and the force component in axial direction is significantly greater than those in other two directions. Due to the vacant travel used for fixing the sleeve near full valve opening,the lateral forces in vertical and horizontal direction will get to their peak magnitudes,which may influence the operation of driving mechanism or make the piston sleeve get stuck in these directions. Moreover,flow field distributions of velocity,pressure,turbulent kinetic energy and turbulent dissipation rate in different openings were compared to illustrate operation and flow characteristics of the flow and pressure regulating valve. The analysis results provide a guidance for selection and utilization of the flow and pressure regulating valve with piston sleeve.
引文
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[16]冯卫民,周春灌,程千,等.调节阀流量特性分析及网孔型套筒阀优化计算[J].中国农村水利水电,2015(1):172-175.
[17]张勤昭,刘福生,王宏.三偏心蝶阀的流场和阻力特性研究[J].流体机械,2013(11):1-5
[18]张伟政,俞树荣,张希恒,等.调节阀内部流场的数值模拟与试验分析[J].兰州理工大学学报,2008,34(3):65-68.
[19]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.
[20]AMIRANTE R,VESCOVO G D,LIPPOLIS A.Flow forces analysis of an open center hydraulic directional control valve sliding spool[J].Energy Conversion&Management,2006,47(1):114-131.
[21]LISOWSKI E,CZYZYCKI W,RAJDA J.Three dimensional CFD analysis and experimental test of flow force acting on the spool of solenoid operated directional control valve[J].Energy Conversion&Management,2013,70:220-229.
[2]陈庆华.长距离输水管道调压调流阀设置探讨[J].水利科技,2011(3):37-38,43.
[3]杨富超,马韧韬,高普新,等.套筒式调流调压阀在水利水电工程中的应用[J].水利水电工程设计,2018,37(2):33-35.
[4]阎秋霞.大口径调流阀应用研究[J].水利建设与管理,2012,32(5):20-22.
[5]靳卫华,谢鸿玺,冯玉林,等.供水工程中调流调压阀的选型及应用[J].中国设备工程,2018(4):103-105.
[6]杨开林.适应水击控制的多喷孔套筒式调流阀设计原理[J].水利水电技术,2010,41(7):36-39.
[7]向国玲.D600调流调压阀流场分析[J].模具工程,2012(3):85-88.
[8]邓君.活塞式调节阀流场特性分析与结构优化[D].株洲:湖南工业大学,2015.
[9]CHATTOPADHYAY H,KUNDU A,SAHA B K,et al.Analysis of flow structure inside a spool type pressure regulating valve[J].Energy Conversion&Management,2012,53(1):196-204.
[10]宋学官,汪林,姜正浩,等.蝶阀流动特性的数值模拟及分析[J].流体机械,2008(5):25-29.
[11]HUANG C,KIM R H.Three-dimensional analysis of partially open butterfly valve flows[J].Journal of Fluids Engineering,1996,118(3):562-568.
[12]张征宇,张治权,吴湘莲,等.湍流模型对阀门数值模拟精度的影响[J].阀门,2008(1):18-19.
[13]王福军.计算流体动力学分析--CFD软件原理与应用[M].北京:清华大学出版社,2004.
[14]杨纪伟.调节阀流量调节特性评价[J].阀门,1999(4):11-15.
[15]杨纪伟.调节阀流量调节理论研究[J].流体机械,2003,31(3):24-26.
[16]冯卫民,周春灌,程千,等.调节阀流量特性分析及网孔型套筒阀优化计算[J].中国农村水利水电,2015(1):172-175.
[17]张勤昭,刘福生,王宏.三偏心蝶阀的流场和阻力特性研究[J].流体机械,2013(11):1-5
[18]张伟政,俞树荣,张希恒,等.调节阀内部流场的数值模拟与试验分析[J].兰州理工大学学报,2008,34(3):65-68.
[19]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.
[20]AMIRANTE R,VESCOVO G D,LIPPOLIS A.Flow forces analysis of an open center hydraulic directional control valve sliding spool[J].Energy Conversion&Management,2006,47(1):114-131.
[21]LISOWSKI E,CZYZYCKI W,RAJDA J.Three dimensional CFD analysis and experimental test of flow force acting on the spool of solenoid operated directional control valve[J].Energy Conversion&Management,2013,70:220-229.
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