燃气轮机气体燃料控制阀流动性能分析与设计优化研究

Flow performance analysis and design optimization of gas fuel control valvefor gas turbine

以燃气轮机气体燃料控制阀为研究对象,基于计算流体力学方法,研究了气体燃料控制阀在实际运行工况下的流场分布以及流量变化规律,拟合了该阀的流动特性曲线。结果表明:在阀前压力2.650 MPa、阀后与阀前压力比为0.49~0.78,相同开度下的控制阀质量流量与阀后压力变化无关,处于阻塞流状态;相同压比下的流量系数与开度近似线性相关,与工程实际要求相吻合;流量系数与喉部面积具有线性相关关系,通过优化阀芯型线,改善喉部面积随开度的线性曲线,提高了流量特性曲线的线性度。

Taking the gas fuel control valve of gas turbine as the research object,based on the computational fluid dynamics method,the flow field distribution and flow change rule of the gas fuel control valve under the actual operating conditions are studied,and the flow characteristic curve of the valve is fitted.The results show that the mass flow of the control valve at the same opening has nothing to do with the change of the pressure behind the valve,and is in a blocked flow state when the pressure in front of the valve is 2.650 MPa and the pressure ratio behind the valve to that in front of the valve is 0.49~0.78;Under the same pressure ratio,the discharge coefficient is approximately linear with the opening,which is consistent with the actual requirements of the project;There is a linear correlation between the flow coefficient and throat area.By optimizing the valve core profile,the linear curve of throat area with opening is improved,and the linearity of the flow characteristic curve is improved.