Numerical Investigation of Flow and Heat Transfer in Vane Impingement/Effusion Cooling with Various Rib/Dimple Structure  

作　　者：WANG Mingrui ZHU Huiren LIU Cunliang WANG Rui WU Zhuang YAO Chunyi 

机构地区：[1]School of Power and Energy,Northwestern Polytechnical University,Xi’an,710129,China

出　　处：《Journal of Thermal Science》2023年第4期1357-1377,共21页热科学学报（英文版）

基　　金：This study is financially supported by the National Science and Technology Major Project(2017-III-0003-0027).

摘　　要：By investigating heat transfer and flow structures of dimples,orthogonal ribs,and V-shaped ribs in the impingement/effusion cooling,the article is dedicated to selecting a best-performing internal cooling structure for a turbine vane.The overall cooling effectiveness and coolant consumption are adopted to evaluate the cooling performance.To analyze the influence of structural modification,the flow field is investigated on chordwise/spanwise sections and the target surface.The blockage effect on crossflow can protect jet flow,resulting in higher heat transfer performance of the target surface.Ribs own a stronger blockage effect than dimples.Compared with the blockage effect,the influence of the rib shape is negligible.By installing dimples between ribs,heat transfer is augmented further.The introduction of ribs/dimples leads to higher discharge coefficients of jet nozzles but lower discharge coefficients of film holes.Thus,the film cooling deteriorates.Meanwhile,the installation of the ribs and dimples decreases total coolant consumption.The effect of ribs/dimples on heat transfer and effusion condition of internal and external cooling is analyzed.The best-performing cooling structure is the target surface with dimples and orthogonal ribs,which decreases the wall temperature and coolant consumption by 14.57-28.03 K and 1.19%-1.81%respectively.This article concludes the flow mechanism for dimples and influence factors on the cooling performance,which may serve as guidance for the turbine vane design.

关 键 词：conjugate heat transfer impingement cooling DIMPLE V-shape rib discharge coefficient 

分 类 号：O35[理学—流体力学] TK124[理学—力学] V231[动力工程及工程热物理—工程热物理]