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利用数值模拟的方法研究了波浪形非均匀间隙封严结构和均匀轴向间隙封严结构下轮缘封严气流对涡轮性能的影响.研究表明:燃气入侵与出流结构受到静盘、动盘及主流切向速度的影响,以低于动盘转速同向旋转,并改变了转子的进气条件,增强了压力面马蹄涡强度,因此对转子出口流场造成很大影响.封严气流与上游导叶尾迹的相互作用引起转子通道内熵增,造成涡轮效率的下降.与均匀轴向间隙封严结构相比,波浪形非均匀间隙封严结构使大的入侵与出流结构破碎为小的结构,对涡轮性能的负面影响减小,涡轮效率提高了0.9%.结果证明了波浪形非均匀间隙封严结构在具有较好的封严效果的同时提高了涡轮性能.
The effects of the seal ring flow on the turbine performance under the non-uniform gap seal structure and the uniform axial gap seal structure were studied by means of numerical simulation. The results show that the structure of gas intrusion and outflow is affected by static disk, And the influence of the main tangential speed at the same rotation speed lower than that of the moving disk, and changed the conditions of intake of the rotor and enhanced the intensity of the horseshoe vortex on the pressure surface, thus greatly affecting the flow field at the rotor outlet. The interaction of upstream guide vanes causes the entropy increase in the rotor channel, resulting in the decrease of the turbine efficiency. Compared with the uniform axial gap sealing structure, the wavy non-uniform gap sealing structure breaks the large invasion and outflow structure into small The results show that the wavy non-uniform gap sealing structure has a better sealing effect and improves the turbine performance at the same time.