叶尖泄漏流/尾迹掺混对串列转子非设计点性能影响

在串列转子设计中,为研究前后排叶片周向位置的变化所引起的泄漏流/尾迹之间掺混的变化对串列转子近失速点性能的影响,首先建立了泄漏流/尾迹掺混分析模型.模型分析结果指出流动掺混可以有效减小通道下游堵塞.在模型分析的基础上,进一步在高负荷串列转子中进行了不同周向位置的对比研究,对模型进行了验证;研究发现在近失速工况,对比无掺混情况,后排叶尖泄漏流/前排尾迹掺混使叶尖堵塞减少了近20%,从而使得高负荷串列转子的失速裕度相对提高了11.7%. 

Effect of tip leakage flow and wake interactions on off-design point performance of tandem rotors

Interactions of tip leakage flow and wake in tandem rotors were researched based on the changes of the circumferential position of back rotor in relation to the front rotor.An analysis flow model was established for studying the effect of above flow interactions.The model results indicate the mixing of tip leakage flow and wake can reduce the blockage greatly.3-D numerical simulations were further carried out in high loading tandem rotors with three typical circumferential arrangments and the model results were verified by the numerical results.According to the research,the mixing of back rotor tip leakage flow and front rotor wake can reduce tip blockage almost by 20% compared with non-mixing case and the stall margin of the tandem rotors increases by 11.7% relatively.