Numerical Investigation on Flow and Cooling Characteristics of a Micro-Ribbed Vane Endwall  

作　　者：DU Kun CHEN Qihao LI Yang SUNDEN Bengt LIU Cunliang LI Wei 

机构地区：[1]School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China [2]Yangtze River Delta Research Institute of NPU,Northwestern Polytechnical University,Taicang 215400,China [3]Shaanxi Key Laboratory of Thermal Sciences in Aero-Engine System,Northwestern Polytechnical University,Xi'an 710129,China [4]NPU-KAI International Joint Laboratory of Advanced Aero-Engine Thermal Structure,Northwestern Polytechnical University,Xi'an 710129,China [5]AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China [6]Department of Energy Sciences,Lund University,Lund SE-22100,Sweden

出　　处：《Journal of Thermal Science》2023年第2期786-799,共14页热科学学报（英文版）

基　　金：the support of National Natural Science Foundation of China(No.52006178);National Key R&D Program of China(No.Y2019-Ⅷ-0007-0168);the Fundamental Research Funds for the Central Universities;the Innovation Capacity Support Plan in Shaanxi Province of China(Grant No.2023-CX-TD-19);the Swedish Research Council(VR);the Swedish National Energy Agency(EM).

摘　　要：The secondary flow originated from the inherent pressure gradient inside the vane cascade has a strong impact on the endwall cooling performance as the crossflow sweeps the upstream coolant jet towards the suction side,resulting in intensifying thermal load near the pressure side endwall.Hence a novel ribbed-endwall is introduced to suppress passage crossflow.The effects of the mass flow ratio and the rib layout were examined using numerical simulations by solving the three-dimensional Reynolds-averaged Navier-Stokes(RANS)equations with the shear stress transport(SST)k-ωturbulence model.The results indicate that the ribs effectively prevent the coolant migrating from the pressure side to the suction side,helping the coolant jet to spread along the lateral orientation.Therefore,the endwall adiabatic film cooling effectiveness is substantially improved.The maximum cooling effectiveness is achieved for the case with three-ribs when the height of the rib equals one hole diameter among all cases.The area-averaged adiabatic cooling effectiveness is enhanced by 31.6%relative to the flat endwall when the mass flow ratio of coolant to mainstream equals to 0.52%.More importantly,the ribbed-endwall obtains a relatively lower level of aerodynamic loss owing to the reduced lateral migration inside the vane cascade.

关 键 词：vane endwall micro-ribbed endwall adiabatic film cooling effectiveness flow structure numerical study 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]