大型灌溉管网减压阀特性数模分析与试验研究  

Numerical and experimental study on characteristics of pressure relief valve in large irrigation pipe network

作　　者：于贤磊 陈松山 杨夏威 周明耀 YU Xianlei;CHEN Songshan;YANG Xiawei;ZHOU Mingyao(School of Hydraulic Energy and Power Engineering,Yangzhou University,Yangzhou,Jiangsu 225009,Chin)

机构地区：[1]扬州大学水利与能源动力工程学院,江苏扬州225009

出　　处：《排灌机械工程学报》2018年第9期824-829,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家科技支撑计划项目(2015BAD24B02-02)

摘　　要：为了探求大型灌溉管网中适用性更强的减压阀型式,提出了一种新型减压阀结构设计方案,阐述了其结构组成和工作原理.运用Gambit和CFX软件建立了阀瓣在5个开度工况下整体结构的三维模型,对阀体进行了数值模拟,分析得到了阀体的静态特性.探明了不同进口流量条件下,减压阀进出口压差变化规律和阀瓣所受驱动力变化规律,同时分析了阀体及特殊截面的压强和速度分布云图.通过模型试验测得阀瓣开度分别固定在1.0,1.6,2.4 cm时,不同进口流量条件下进出口压差值,结果表明:试验与数模结果偏差在2.8%~7.9%,数值模拟和物理模型试验结果证明结构改进设计方案是合理的.为减压阀阀体结构设计提供了理论指导,并为今后同类产品开发提供了参考依据.In order to explore a type of pressure relief valve with an even more suitability to a large irrigation pipe network, a new type design of pressure relief valve was proposed, and its structure and working principle were explained. Using Gambit and CFX software , three-dimensional models of the valve were established at five openings （i. e. 0.8, 1, 1.2, 1.6 and 2.4 cm） of the valve clack and numerical simulations were conducted to analyze static characteristics of the valve body. The variation rules of inlet and outlet pressure difference and the driving force on the valve clack were demonstrated under various inlet flow conditions. Meanwhile, the pressure and velocity contours in the valve body and a few specially chosen cross-sections were also analyzed. The pressure differences between inlet and outlet under different inlet flow conditions were measured on an experimental model when the clack openings were at 1.0, 1.6 and 2.4 cm, respectively. The results show that the deviation between measurement and simulation is between 2.8% and 7.9% , suggesting the preoposed design is reasonable. This outcome provides a theoretical guidance for hydraulic design of the valve body, and offers reference for similar product development in the future.

关 键 词：减压阀 结构设计 静态特性 数值模拟 模型试验 

分 类 号：S277.9[农业科学—农业水土工程]