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Aerodynamic Performance Improvement of a Highly Loaded Compressor Airfoil with coanda jet flap

Journal of Thermal Science 2022年第1期31卷 151-162页

作者： ZHANG Jian DU Juan ZHANG Min CHEN Ze ZHANG Hongwu NIE Chaoqun North China Electric Power University Beijing 100096China 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 100190China Changsha University of Science&Technology Changsha 410114China

coanda jet flap is an effective flow control technique,which offers pressurized high streamwise velocity to eliminate the boundary layer flow separation and increase the aerodynamic loading of compressor ***,there is only single-jet flap on the blade suction side.A novel coanda double-jet flap configuration combining the front-jet slot near the blade leading edge and the rear-jet slot near the blade trailing edge is proposed and investigated in this *** reference highly loaded compressor profile is the Zierke&Deutsch double-circular-arc airfoil with the diffusion factor of ***,three types of coanda jet flap configurations including front-jet,rear-jet and the novel double-jet flaps are designed based on the 2D flow fields in the highly loaded compressor blade *** Back Propagation Neural Network(BPNN)combined with the genetic algorithm(GA)is adopted to obtain the optimal geometry for each type of coanda jet flap *** simulations are then performed to understand the effects of the three optimal coanda jet flaps on the compressor airfoil *** indicate all the three types of coanda jet flaps effectively improve the aerodynamic performance of the highly loaded airfoil,and the coanda double-jet flap behaves best in controlling the boundary layer flow *** the inlet flow condition with incidence angle of 5°,the total pressure loss coefficient is reduced by 52.5%and the static pressure rise coefficient is increased by 25.7%with coanda double-jet flap when the normalized jet mass flow ratio of the front jet and the rear jet is equal to 1.5%and 0.5%,*** impacts of geometric parameters and jet mass flow ratios on the airfoil aerodynamic performance are further *** is observed that the geometric design parameters of coanda double-jet flap determine airfoil thickness and jet slot position,which plays the key role in supressing flow separation on the airfoil suction ***

关键词： coanda jet flap high loaded compressor active flow control aerodynamic performance

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