Numerical study on film cooling mechanism and characteristics of cylindrical holes with branched jet injections

作     者：Yu Yao Jingzhou Zhang Yang Yang 

作者机构：School of Aircraft EngineeringNanchang Hangkong UniversityNanchang 330063China College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 2І00І6China 

出 版 物：《Propulsion and Power Research》 (推进与动力（英文）)

年 卷 期：2013年第2卷第1期

页      面：30-37页

学科分类：080704[工学-流体机械及工程] 08[工学] 0820[工学-石油与天然气工程] 0817[工学-化学工程与技术] 080103[工学-流体力学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0827[工学-核科学与技术] 0802[工学-机械工程] 0703[理学-化学] 0825[工学-航空宇航科学与技术] 0823[工学-交通运输工程] 0801[工学-力学（可授工学、理学学位）] 

主　　题：Film cooling Branched jetinjection holes Cooling effectiveness Heat transfer Numerical simulation 

摘      要：The film cooling mechanism and characteristics of a row of cylindrical holes with branched jet injections were investigated by numerical *** geometries for the branched jet injection holes and four blowing ratios were *** results led to the following conclusions:(1)when additional branched jet injections supplement the primary holes,the kidney vortices are suppressed,and film lateral coverage is enlarged,which improves the film cooling effectiveness;(2)suppression of kidney vortices from the primary holes is due to anti-vortex and coolant-distribution actions by the additional branched jet injections;(3)when the exit of the branched jet injection holes is located in line with the primary film cooling holes,a lower heat transfer coefficient ratio and higher film cooling effectiveness are achieved;(4)the film cooling effectiveness is clearly improved by additional branched jet injections under higher blowing ratios.