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Stall Behaviour in a mixed-flow compressor with Axial Slot Casing Treatment

Journal of Thermal Science 2022年第1期31卷 13-24页

作者： QIU Jiahui ZHANG Qianfeng ZHANG Min DU Juan ZHANG Wenqiang MAROLDT Niklas SEUME Joerg R. Advanced Gas Turbine Laboratory Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Advanced Energy and Power Chinese Academy of SciencesBeijing 100190China Innovation Academy for Light-Duty Gas Turbine Chinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China China Aerodynamics Research and Development Center Beijing 100029China University of Nottingham Nottingham NG72RDEngland Institute of Turbomachinery and Fluid Dynamics Leibniz University HannoverGarbsen 30823Germany

Casing treatment is an effective technique in extending stall margin of axial and centrifugal ***,its impacts on the stall behaviour of mixed-flow compressor are still not completely understood until *** conquer this issue,unsteady full-annulus simulations were conducted to investigate the stall mechanism of a mixed-flow compressor with and without axial slot casing treatment(ASCT).The circumferential propagating speed of spike inception resolved by the numerical approach is 87.1%of the shaft speed,which is identical to the test *** numerical results confirmed that the mixed-flow compressor fell into rotating stall via spike-type with and without *** flow structure of the spike inception was investigated at 50%design rotational *** static pressure traces extracted upstream of the leading edge had shown a classic spiky ***,it was found that with and without ASCT,the mixed-flow compressor stalled through spike with the characteristic of tip leakage spillage at leading edge and tip leakage backflow from trailing edge,which is different from a fraction of the centrifugal *** resultant phenomenon provides conoborating evidence for that unlike in axial-flow compressor,the addition of ASCT does not change the stall characteristics of the mixed-flow *** flow structure that induced spike inception with ASCT is similar to the case with smooth *** the throttling process,tip leakage flow vortex had been involved in the formation of tornado vortices,with one end at the suction side,and the other end at the *** low-pressure region relevant to the downward spike is caused by leading-edge separation vortex or tornado *** high-pressure region relevant to the upward spike is induced by blockage from the passage *** results not only can provide guidance for the design of casing treatment in mixed-flow compressor,but also can pave the way for the stall waring in the highly-l

关键词： mixed-flow compressor casing treatment spike-type stall inception unsteady simulation tornado vortex

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Understanding of tip clearance flow structure in high speed mixed flow compressor

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Propulsion and Power Research 2023年第3期12卷 356-379页

作者： Hemant Kumar Chetan S.Mistry Department of Aerospace Engineering Indian Institute of TechnologyKharagpurWest Bengal 721302India

This paper addresses the necessity to make a physical interpretation of a highly complex three-dimensional tip clearance flow field study for high-speed mixed-flow compressor having stage exit static pressure to inlet total pressure ratio of 3.8 with 39,836 rpm rotor *** four different tip configurations namely the constant(l Z 0.016 and 0.019)and variable(l Z 0.011(inlet)-0.019(exit)and 0.019(inlet)-0.022(exit))tip clearances were numerically analysed using available experimental *** numerical investigation reveals that in contrast to the classic jet-wake pattern,two anomalous velocity profiles formed at the impeller exit which results in pressure losses in the vaneless *** the impeller inlet,the tip leakage flow rolls up to discrete tip leakage vortex structure for each tip clearance *** results in the formation of a region of momentum deficit,recirculation zone,which gets weakened as it moves *** tip clearance configuration is observed to profoundly influence the extent and vorticity of the tip leakage *** the splitter blade passage,the tip leakage flow and Coriolis flow interact with passage flow,resulting in the formation of two secondary passage vortices that move downstream along the pressure and suction surface of the splitter *** tip clearance configuration directly influences the impeller exit jetwake pattern by modulating the secondary passage vortices trajectory and ***,off-design analysis for tip clearances l Z 0.016 and l Z 0.019,depict distinctive tip leakage vortex *** operating near the stall conditions(80%of design mass flow rate),l Z 0.019 exhibits bubble shape tip leakage vortex breakdown occurring near the impeller *** result in a substantial change in the tip leakage vortex nature;expansion of the recirculation zone and early weakening of the vorticity in the tip leakage *** is observed that vortex breakdown plays a vital role in characte

关键词： Recirculation zone Vortex breakdown Tip leakage flow mixed-flow compressor Jet-wake flow Vaned-diffuser

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