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Full blended blade and endwall design of a compressor cascade

Chinese Journal of Aeronautics 2021年第11期34卷 79-93页

作者： Tongtong MENG Guang YANG Ling ZHOU Lucheng JI School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Poly Technologies Inc. Beijing 100010China Institute for Aero Engine Tsinghua UniversityBeijing 100084China

In the current state-of-the-art,high-loss flow in the endwall significantly influences compressor ***,the control of endwall corner separation in compressor blade rows is important to *** on the previous research of the Blended Blade and End Wall(BBEW)technique,which can significantly reduce corner separation,in combination with a nonaxisymmetric endwall,the full-BBEW technique is proposed in this study to further reduce the separation in endwall *** principle of the unchanged axial passage area is considered to derive the geometric method for this *** models are further classified based on different geometric characteristics of this technique:the BBEW model,Inclining-Only End Wall(IOEW)model,and full-BBEW *** most effective design of each model is then found by performing several optimizations at the design point and related numerical investigations over the entire operational *** with the prototype,the total pressure loss coefficient decreases by 7%–9%in the optimized full-BBEW at the design ***,the aerodynamic blockage coefficient over the entire operational range decreases more than the other models,which shows its positive effect for *** approach has a larger decrease at negative incidence angles where the intersection of the boundary layer plays an important role in corner *** analysis shows that the blended blade profile enlarges the dihedral angle and creates a span-wise pressure gradient to move low momentum fluid towards the ***,the inclining hub geometry accelerates the accumulated flow in the corner downstream by increasing the pressure ***,though losses in the mainstream grow,especially for large incidences,the full-BBEW technique effectively reduces the separation in corners.

关键词： Aerodynamics Blended Blade and End Wall(BBEW) Corner separation endwall profiling Flow control Turbomachinery

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