【作者】 王凯；

【导师】 董平；

【作者基本信息】 哈尔滨工程大学 ， 动力工程及工程热物理， 2016， 硕士

【摘要】 高负荷压气机是先进燃气轮机的重要组成部分,采用流动控制技术提高压气机性能越发受到研究人员的重视。本文利用主/被动式旋涡发生器对某压气机矩形叶栅端区进行流动控制,提高叶栅性能。本文利用数值计算软件,研究了主/被动式旋涡发生器对某压气机矩形叶栅端区流动的影响,其中主动式旋涡发生器为一个射流管,被动式旋涡发生器为前缘处凸起的几何结构。对于主动式旋涡发生器而言,研究了零攻角下射流管不同轴向位置、不同周向位置、不同侧向倾角和不同射流总压对压气机矩形叶栅内部流动性能的影响,在此基础上研究变攻角下压气机矩形叶栅的内部流动性能。对于被动式旋涡发生器而言,研究了不同攻角和不同夹角下压气机矩形叶栅的内部流动性能。研究结果表明:对于主动式旋涡发生器,能够有效改善压气机矩形叶栅零攻角和正攻角下的流动性能,扩大正攻角稳定工作范围,在+3°攻角时总压损失降幅高达42.2%,且射流流量一般为主流流量的0.3%左右,耗费较小代价的同时取得了较好的效果。负攻角时,主动式旋涡发生器对压气机平面矩形叶栅性能的影响随攻角的变化而不同。对于被动式旋涡发生器,能够有效提高压气机矩形叶栅零攻角和正攻角下的流动性能,扩大正攻角稳定工作范围,在+3°攻角时总压损失降幅高达44.8%。在负攻角时,随攻角绝对值的增大,流动损失相应增大,在-6°攻角时,总压损失有最大增幅6.3%。更多还原

【Abstract】 Highly loaded compressor plays an important role in advanced gas turbine. Adopting flow control technology to improve the performance of compressor has drawn the researchers’attention.This paper employed the active/passive vortex generator which can control the flow of certain compressor’s rectangular endwall region to improve the cascade performance.Based on the numerical calculation software, this paper studied the main influences,which caused by the active/passive vortex generator, on the endwall flow of a compressor rectangular cascade. The active vortex generator was a jet pipe and the passive one was the geometry that had a convex at the leading edge. For the active vortex generator, this paper studied the influences of different axial positions, circumferential positions, lateral angles and jet total pressures on the internal flow performance of a compressor rectangular cascade at zero angle of attack. And on this basis, further study on the internal flow performance of a compressor rectangular cascade at different angles was conducted. Besides, the internal flow performance of a compressor rectangular cascade at different angles and incidence angles which was defined in the passive vortex generator was studied.The results indicated that the active vortex generator could effectively improve compressor cascade flow performance at the 0° incidence angle and positive incidence angle.Expanding stable working range of positive incidence angle to +3°, total pressure loss was reduced by 42.2%, and the jet flow mass was about 0.3% of the mainstream flow mass generally, the good results have been achieved with less cost at the same time. When under negative incidence angle, the active vortex generator caused different influences on the performance of compressor rectangular cascade with different incidence angles. As for the passive vortex generator, it could effectively improve compressor cascade flow performance at the 0° and positive incidence angle. Meanwhile, expanding stable working range of positive incidence angle to +3°, total pressure loss was reduced by 44.8%. With the increase of absolute value of negative incidence angle, the flow loss increased correspondingly. And total pressure loss’ maximum increase could reach to 6.3% at -6° incidence angle.更多还原