摘要
为深入了解带侧向出流通道内部换热特性,采用热色液晶瞬态测量技术对带侧向出流孔的梯形通道内表面换热进行了测量,重点分析侧流孔孔间距、通道进口雷诺数及侧流比对梯形通道内表面换热特性的影响。实验结果表明:侧流孔孔间距的增大使努塞尔数沿整个面的分布趋于均匀;进口雷诺数的增加会明显加强通道内的换热;随着侧流比的增大,通道沿主流方向同一位置处的换热明显减弱,整个通道内表面的平均努塞尔数亦有所下降。
In order to deeply understand the heat transfer mechanism of the channel with side - outflow, a transient measurement technique of using narrow - band thermochromic liquid crystal is employed to determine heat transfer characteristics on the inner surfaces of trapezium channel with ejection through the suction holes. Experimental studies are carried out to investigate inner surface Nusselt numbers under various spaces between holes, Reynolds numbers and suction - holes - flow ratios. The result indicates that the increase of space between holes has weak influence on surface average Nusseh numbers, but makes the Nusseh numbers distribute more uniformly and the heat transfer intensity is enhanced with the increase in inlet Reynolds numbers. With the increase of the suction - holes -flow ratio, heat transfer are declined obviously in the same position along the main flow, and the surface average Nusselt number is also declined.
出处
《空军工程大学学报（自然科学版）》
CSCD
北大核心
2009年第2期14-18,共5页
Journal of Air Force Engineering University(Natural Science Edition)
基金
国家"973"计划资助项目(2007CB707701)
关键词
侧流孔
液晶
瞬态
内流通道
换热系数
suction hole
liquid crystal
transients
internal passage
heat transfer coefficient
