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由于轮毂封严气将会对涡轮的流场结构和气动性能产生一定的影响,采用数值模拟研究了不同封严气流量条件下轮毂缘板进口圆角半径对涡轮气动性能和内部流动结构的影响。结果表明,圆角半径的改变导致封严腔内部的流动、封严气在涡轮通道中的传播轨迹以及涡轮通道涡的发展发生改变,进而使涡轮级的载荷系数、反力度和流量系数的分布发生变化,最终影响到涡轮的气动性能。对于本研究的算例,缘板进口圆角半径的变化对涡轮效率的影响幅度能达到0.3%,圆角半径的影响随封严气量的增大而增强。
Because the wheel seal gas will affect the flow field and aerodynamic performance of the turbine, numerical simulation is used to study the influence of the fillet radius of the hub flange on the aerodynamic performance and internal flow structure of the turbine under different seal air flow rates . The results show that the change of fillet radius leads to the flow inside seal chamber, the propagation path of seal gas in turbine passage and the development of turbine passage vortex change, so that the distribution of load factor, reaction force and flow coefficient of turbine stage Changes, eventually affecting the aerodynamic performance of the turbine. For the example in this study, the influence of the change of fillet radii on the efficiency of the turbine can reach 0.3%, and the influence of fillet radius increases with the increase of seal gas.