稀疏孔阵层板冷却结构的主要参数影响数值研究  

Numerical Investigation on Influence of Main Structural Parameters in Lamilloy Cooling Configuration with a Sparse Hole Array

作　　者：季钧 张靖周[1,2] 王春华 JI Jun;ZHANG Jingzhou;WANG Chunhua(College of Energy and Power Engineering,Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Techonology,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China;Collaborative Innovation Center of Advanced Aero-engine,Beijing,100191,China)

机构地区：[1]南京航空航天大学能源与动力学院,航空发动机热环境与热结构工业和信息化部重点实验室,南京210016 [2]先进航空发动机协同创新中心,北京100191

出　　处：《南京航空航天大学学报》2019年第6期848-856,共9页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家自然科学基金（U1508212）资助项目

摘　　要：针对燃烧室火焰筒的气动热力条件,在给定的单位壁面面积冷却空气质量流量下,通过数值模拟较为系统地研究了稀疏孔阵层板结构主要参数对冷却性能的影响,冲击孔、扰流柱和气膜孔数之比为1∶10∶1。在本文研究的结构参数范围内,气膜孔和冲击孔直径对于层板的综合冷却效果和压降影响相对较大,增大气膜孔直径有利于改善综合冷却效果并降低冷却气流通过层板的压力损失,增大冲击孔直径虽降低了冷却气流压力损失但同时也导致综合冷却效果有一定的减弱;射流冲击间距和扰流柱直径的改变对压力损失影响甚微,扰流柱直径增加可以提升层板综合冷却效果,小射流冲击间距比的层板综合冷却效果略优。A series of numerical simulations were performed to investigate the effects of geometric parameters on cooling performance of a laminate porous plate with a sparse hole array,under a given coolant massflow rate per unit wall-surface area and the combustor linear representative conditions.The relationship between impinging-hole number,pin-fin and film-holes number is 1∶10∶1.Among the current ranges of geometric parameters,it is found that the film-hole diameter and impinging-hole diameter have relatively stronger influence on overall cooling effectiveness and pressure drop across the laminate porous plate.Increasing film-hole diameter is helpful for improving overall cooling effectiveness and reducing pressure drop.Increasing film-hole diameter results a reduction of pressure drop and overall cooling effectiveness.The variation of pin-fin diameter or impinging distance has nearly no influence on the pressure drop.The increase of pin-fin diameter results in a little increase of overall cooling effectiveness.Small dimensionless impinging distances seems to be a little advantageous.

关 键 词：多孔层板 稀疏孔阵 综合冷却效果 相对压力损失 流量系数 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]