Controlling secondary flow in high-lift low-pressure turbine using boundary-layer slot suction
作者机构:School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Key Laboratory of Light-Duty Gas-TurbineInstitute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China School of Aeronautics and AstronauticsUniversity of Chinese Academy of SciencesBeijing 100190China
出 版 物:《Chinese Journal of Aeronautics》 (中国航空学报(英文版))
年 卷 期:2024年第37卷第3期
页 面:21-33页
核心收录:
学科分类:082502[工学-航空宇航推进理论与工程] 08[工学] 0825[工学-航空宇航科学与技术]
基 金:support for this work was provided by the National Natural Science Foundation of China(No.52206060) the National Science and Technology Major Project of China(Nos.J2019-Ⅱ-0021-0042 and J2019-Ⅱ-0002-0022)
主 题:Low-pressure turbine Secondary flow Flow control Boundary-layer suction Incoming wake
摘 要:The design of high-lift Low-Pressure Turbines(LPTs)causes the separation of the boundary layer on the suction side of the blade and leads to a strong secondary *** present study aims to minimize secondary losses through endwall slot suction and incoming wakes in a front-loaded high-lift LPT cascade with Zweifel of 1.58 under low Reynolds number of *** slotted schemes for the boundary layer of the endwall were designed(Plan A and Plan B),and the effects of suction mass flow on secondary flow were *** underlying physics of the endwall boundary layer of the suction and secondary flow under unsteady wakes was *** results show that slot suction at the endwall boundary layer can significantly suppress the secondary flow by removing low-momentum *** A and B significantly reduced the secondary kinetic energy by 44.2%and 36.9%,respectively,compared with the baseline cascade at the suction mass flow ratios of 1%.With an increase in the mass flow ratio of suction,the secondary flow was gradually reduced in both Plans A and *** is more beneficial to control the secondary flow to destroy the intersection of the pressure side and suction side of the horseshoe vortex before it develops into a passage *** unsteady wakes,the combined effects of incoming wakes and endwall boundary layer suction can further suppress the secondary flow at the suction mass flow ratios of 2%for Plan A,because the positive and negative vorticity inside upstream wakes accelerated the mixing of the main flow and secondary flow and thus increased the energy of secondary vortices.