不同阀芯扩散型线对汽轮机调节阀流动特性的影响

Study on flow characteristics of steam turbine control valves with different spool diffusion lines

  • 摘要: 【目的】为了解决某型汽轮机组存在运行不稳,振动和异响等问题,提出了通过内切式阀芯结构改变调节阀内部流动特性的方法。【方法】使用全尺寸高精度建模方法,建立某型调节阀的全尺寸通流区域。基于超音速膨胀抑制原则设计了两型内切式调节阀阀芯,采取多尺度混合网格与多类型边界层的网格划分方法,通过多轮迭代计算实现加速收敛。【结果】最终计算结果与试验测量误差小于5%。仿真结果分析表明:新型内切阀在节流区与阀芯底部蒸汽流动性能得到优化,有助于降低阀芯下部非对称流动导致的能量损失与振动噪声;新的阀芯结构还使汽体对调节阀的作用力减少20%~30%。【结论】调节阀阀芯结构对流场特性有重要影响,内切式阀芯的设计对优化流场分布具有一定指导意义。

     

    Abstract: The method of changing the internal flow characteristics of the control valve by using an internally-cut control valve spools structure is proposed to solve the problems of unstable operation, vibration, and abnormal noise in a certain type of turbine unit. Methods By utilizing the full-scale high-precision modeling approach, the complete flow area of a specific type of control valve is established. Two types of internally-cut control valve spools were designed based on the principles of supersonic expansion suppression. The grid division method employs a multi-scale hybrid grid and multiple types of boundary layer grids. Accelerated convergence is achieved through multiple iterative calculations. Results The final computational results showed less than 5% error compared to experimental measurements. The simulation analysis indicates that the new internally-cut valve enhances steam flow performance in the throttle area and at the base of the valve spool. This optimization helps reduce energy loss and vibration noise caused by asymmetric flow beneath the spool. Additionally, the new spool structure reduces the steam's force on the control valve by 20% to 30%.Conclusions The structure of the control valve spool significantly influences the characteristics of the flow field. The design of the internally-cut control valve spools offers valuable guidance for optimizing flow field distribution.

     

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