机匣凹槽对轴流压气机性能的影响  

The Influence of the Casing Grooves on the Performance of An Axial Compressor

作　　者：Naseem Ahmad Ghulam Ishaque Arif Aziz Zubair Ali Shah Mushayyed Muhammad Ali Khan 郑群 Naseem Ahmad;Ghulam Ishaque;Arif Aziz;Zubair Ali Shah;Mushayyed Muhammad Ali Khan;Qun Zheng(Department of Mechanical Engineering,Institute of Space Technology,Islamabad,Pakistan;College of Power and Energy Engineering,Harbin Engineering University,Harbin,China)

机构地区：[1]不详

出　　处：《风机技术》2021年第5期27-32,I0006,共7页Chinese Journal of Turbomachinery

摘　　要：燃气轮机压气机的稳定运行范围由于每级最大负荷而减少。最大性能与稳定运行状态密切相关,如果运行状态发生一些快速变化,则会导致流动失稳,并导致旋转失速。为避免这种情况,应保持适当的失速裕度,使轴流压气机性能更好。通过叶尖和机匣壁面处理可以提高失速裕度。为提高轴流压气机的失速裕度,机匣处理被广泛用于被动流动控制。当前的CFD研究使用NASA转子37通过有限体积技术离散3D RANS方程来研究凹槽的性能。为了验证转子37,对一个通道进行了稳态仿真。仿真结果与总压比和效率的实验测量数据非常吻合。根据收敛标准来预测失速。提出了矩形端壁凹槽模型并进行了数值验证。对矩形凹槽和光滑壁面的性能进行对比评估,发现与光滑壁面相比,矩形凹槽的失速裕度增加了6.37%。通过安装凹槽使TLV减至最小,矩形CGCT模型减少了涡流停滞区,有助于延迟失速的发生。机匣凹槽显著提高了轴流压气机的失速裕度,但导致了效率的略微下降。The stable range of the gas engine compressors is reduced due to per stage maximum loading.The performance of the engine is closely associated with stable operating conditions.The instabilities of the flow occur if some rapid changes happen in the operating conditions and it leads to a rotating stall.To avoid such conditions,the proper stall margin should be maintained for the performance of the axial flow compressor.The stall margin can be enhanced by the blade tip and casing treatment.The casing treatment is commonly used to increase the stall margin of the axial compressor.The present numerical study investigated the performance of casing grooves on NASArotor 37 by discretizing 3DRANS equations with the help of the finite volume method.One passage steady simulation is carried out for validation.The simulation results agree well with the experimental data for total pressure ratio and efficiency.The stall is predicted according to convergence criteria.The rectangular grooves model has been proposed and tested numerically.The performance of rectangular grooves and smooth wall casing is evaluated.The stall margin of the rectangular grooves model is increased by 6.37%as compared to the smooth casing.TLV is minimized with the help of the installation of grooves that reduced the vortex stagnation zone and supports to improve the stall.The stall margin of the axial compressor with casing grooves is remarkably enhanced but efficiency is slightly reduced.

关 键 词：轴流压气机 失速裕度 最大负荷 旋转失速 稳态仿真 机匣处理 流动失稳 稳定运行状态 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]