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Controlling secondary flow in high-lift low-pressure turbine using boundary-layer slot suction

Chinese Journal of Aeronautics 2024年第3期37卷 21-33页

作者： Xiao QU Liunan LI Yingjie ZHANG Xingen LU Junqiang ZHU Yanfeng ZHANG School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Light-Duty Gas-turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing 100190China

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.

关键词： low-pressure turbine Secondary flow Flow control Boundary-layer suction Incoming wake

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Unsteady wakes-secondary flow interactions in a high-lift low-pressure turbine cascade

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Chinese Journal of Aeronautics 2020年第3期33卷 879-892页

作者： Xiao QU Yanfeng ZHANG Xingen LU Junqiang ZHU Key Laboratory of Light-Duty Gas-turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100190China

Detailed experimental measurements were conducted to study the interactions between incoming wakes and endwall secondary flow in a high-lift low-pressure turbine(LPT)*** of the measurements were conducted in both the presence and absence of incoming wakes,and numerical analysis was performed to elucidate the flow *** increasing Reynolds number,the influence of the incoming wakes on suppressing the secondary flow gradually increased owing to the greater influence of incoming wakes on reducing the negative incidence angle at higher Reynolds numbers,leading to a lower blade loading near the leading edge and suppression of the pressure Side(PS)leg of the horseshoe ***,the effect of unsteady wakes on suppressing the profile losses gradually became weaker owing to the reduced size of the Suction Side(SS)separation bubble and increased mixing loss in the free-flow region at high Reynolds *** wakes clearly improved the aerodynamic performance of the low-pressure turbine cascade at low Reynolds numbers of 25,000 and 50,*** contrast,at the high Reynolds number of 100,000,the profile loss at the midspan and mass-averaged total losses downstream of the cascade were higher in the presence of wakes than in the absence of wakes,and the unsteady wakes exerted a negative influence on the aerodynamic performance of the LPT cascade.

关键词： Experimental study High-lift Incoming wakes low-pressure turbine Secondary flow

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Numerical investigation on bowed blades of large meridional expansion turbine

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Journal of Harbin Institute of Technology(New Series) 2010年第5期17卷 735-740页

作者：唐洪飞黄洪雁王振峰韩万金 School of Energy Science and Engineering Harbin Institute of Technology

To improve the performance of the Turbofan engine,several measures should be considered during design *** measures,relating to aerodynamic characteristic design,include the maximum enthalpy per stage,the shortest axial length,the minimum blade rows and the highest efficient in design and off design *** satisfy theses design characters,the meridian geometry of the engine will be excurvature at a high degree transition part between HP and LP *** study is to investigate the effect of blade bowing on flow loss at blade tip and root of the type of *** turbine,tending towards separation,with severe secondary flow at the tip and strong radial flow at exit,was simulated by the 3D N-S solver Numerca,and there were several different stacking line bowing schemes in *** results show that tip negative bowing and root positive bowing is able to weaken radial flow,consequently reduce the flow loss at the tip and root.

关键词： meridional expansion spanwise flow bowed blade low-pressure turbine numerical simulation

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