摘要
研究了喷嘴直径（D）、相邻喷嘴距离（L）和喷射压力（P）对驻点区和紊流区换热的影响。结果表明：在高压（500kPa）下,紊流区心部换热效果比驻点区心部强;当喷嘴直径和喷射压力一定,相邻喷嘴距离对厚板冷却有影响,距离越小,相邻涡对互相干扰越大,紊流区冷却强度加大;当L/D=8~14时,从470℃冷至300℃的平均冷却速率出现波谷,L/D=14~20间出现波峰。
Impingement heat transfer is not only related to the types of fluid,the impacted surface morphology and the pressure of injection,but also related to the size and layout of nozzles.This article studied the influence of diameter（D） of nozzles,the distance（L） of adjacent nozzles and the injection pressure（P） to the heat transfer in the stagnation and turbulent.The results show that the effect of heat exchange in turbulent region of samples centre is stronger than that of stagnation region by 500kPa impinging.When D and P is fixed,different L has different influence on the cooling of thick plate.The smaller the L,the greater the mutual interference of adjacent vortex,and at the same time the turbulent cooling intensity increased.When L/D=8~14,it appears trough at the average cooling rates from 470 ℃ to 300 ℃,while when L/D=14~20,it appears peak.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2011年第1期31-35,共5页
Journal of Aeronautical Materials
基金
国家重点基础研究计划资助项目(2005CB623700)
关键词
冲击换热
喷射流
喷嘴
铝合金
heat transfer of impinging jet
spraying jet flow
nozzle
aluminum alloy
