摘要
以汽轮机常用的GX-1型调节阀为研究对象,通过在阀座喉部、阀座渐扩段等阀体内各关键部位设置测点,利用微小型高频动态压力传感器及其采集系统进行多工况和多方位的试验研究,同时利用有限差分方法进行三维可压缩湍流数值模拟.通过理论分析、试验研究和数值模拟深入研究了阀内复杂的流动特性.结果表明,中小压比时阀内气流会出现流型反复交变,阀喉部附近流场最不均匀且不稳定,至使阀门的主要损失集中在喉部附近,而且可能引起气流的脉动.
For a commonly used control valve in steam turbine of GX-1 type, some measurement points are installed in key positions of the valve such as valve seat throat, valve seat diffuser and so on. Some mini-sensors of pressure with the collection system that have high frequencies and dynamic performances are employed successfully. The collection and measurement for many working conditions are carried out. The numerical simulation is to calculate the three dimensional, compressible and turbulent flow in steam turbine control valve by finite difference method. The complicated flow characteristics in control valve are studied by theoretical analysis, experimental investigation and numerical simulation. The results show that under the conditions of middle and small pressure ratio, the flow patterns in control valve are repeatly changed and the flow field is extremely nonuniform near the valve throat and is unstable. The energy loss mainly occurs near the valve throat, moreover the unsteady flow may induce its oscillation.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2003年第11期1124-1127,共4页
Journal of Xi'an Jiaotong University
基金
教育部博士学科点专项科研基金资助项目 (1 9990 6981 7)
关键词
调节阀
流动特性
试验研究
数值模拟
Compressible flow
Computer simulation
Finite difference method
Flow of fluids
Pressure measurement
Three dimensional
Turbulent flow
Valves (mechanical)
