| 李燕辉,廖志芳,蒋劲,王玉成,罗爽.大口径活塞套筒式调流调压阀流动特性分析[J].水利学报,2019,50(4):516-523 |
| 大口径活塞套筒式调流调压阀流动特性分析 |
| Flow characteristics analysis of large-diameter flow and pressure regulating valve with piston sleeve |
| 投稿时间：2018-10-25 |
| DOI：10.13243/j.cnki.slxb.20180950 |
| 中文关键词: 调流调压阀 流量系数 流阻系数 侧向力 流动特性 |
| 英文关键词: flow and pressure regulating valve flow coefficient resistance coefficient lateral force flow characteristics |
| 基金项目:国家自然科学基金资助项目（51879201） |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Various flow and pressure conditions of pipeline can be adjusted by the flow and pressure regu-lating valve whose hydraulic regulation performance and flow characteristics greatly influence the efficient op-eration of pipeline system. In this research, the large-diameter flow and pressure regulating valve with pis-ton sleeve of 2400LT-41X-10Q type was investigated by the CFD code Fluent, combined with RNG k-ε turbulence 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 influ-ence 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 differ-ent openings were compared to illustrate operation and flow characteristics of the flow and pressure regulat-ing valve. The analysis results provide a guidance for selection and utilization of the flow and pressure regu-lating valve with piston sleeve. |
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