摘要
为研究间接作用式燃气调压器系统中一级调压器调压性能,采用标准k-ε湍流模型,结合动网格技术进行数值模拟,研究在不同进口压力下流动特性及内部流场随开度的变化规律。结果表明:在不同进口压力下,随着开度增大,驱动压力与流阻系数先急剧减小再逐渐保持稳定,质量流量与流量系数呈现出抛物线型增加,各流动特性曲线之间相差不大。一级调压器具有较好的流动特性,在小开度下消能降压效果显著。在四种开度下,阀口处存在较大的压力与流速梯度,气体经过阀口两侧形成高速对冲射流,在阀口中心处汇聚后向下游喷射流出。对冲射流和回流在阀芯近壁面处相互作用产生湍流旋涡,使阀芯近壁面处形成低压区。随着开度的增大,内流场中最小压力、湍流旋涡区域逐渐减小,阀口处流速、对冲射流向下游延伸范围逐渐增大。研究结果可为该类型调压器的运行与结构优化提供参考。
In order to study the indirect action gas regulator system in a regulator regulator performance,using standard k-εturbulence model,combined with dynamic mesh technology for numerical simulation,to study the flow characteristics under different inlet pressures and the internal flow field with the change rule of the opening degree.The results show that under different inlet pressures,with the increase of opening degree,the driving pressure and flow resistance coefficient first decreases sharply and then gradually remain stable,the mass flow rate and flow coefficient shows a parabolic increase,the flow characteristics of the curve is not much difference between the curves.The primary regulator has better flow characteristics,and the effect of energy dissipation and pressure reduction is significant at small openings.In four openings,there is a large pressure and flow rate gradient at the valve opening,the gas passes through both sides of the valve opening to form a high-speed convective jet,which converges at the centre of the valve opening and then jets out downstream.The convective jet and return flow interact with each other near the wall of the spool to produce turbulent vortices,forming a low-pressure area near the wall of the spool.As the opening increases,the minimum pressure and turbulent vortex region in the internal flow field decreases,and the flow velocity at the valve opening and the downstream extension of the convective jet increases.The results of the study can provide a reference for the operation and structure optimisation of this type of regulator.
作者
陈强
石艳
邹文胜
唐威
徐广琦
Chen Qiang;Shi Yan;Zou Wensheng;Tang Wei;Xu Guangqi(College of Mechanical Engineering,Sichuan University of Science and Engineering,Sichuan Yibin 644000,China;TA Valves&Regulators Company,Sichuan Zigong 643000,China)
出处
《燃气轮机技术》
2024年第4期26-31,39,共7页
Gas Turbine Technology
基金
四川省科技计划重点研发项目(2022YFG0068)
宜宾市科技计划项目(2022GY003)。
关键词
调压器
流动特性
流场
流量系数
流阻系数
regulator
flow characteristics
flow field
flow coefficient
flow resistance coefficient
