点击次数：

所属单位：能源与动力学院

发表刊物：INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER

关键字：Conjugated convective heat transfer Hot jet impingement Conical surface Chevron nozzle

摘要：Experimental investigations were carried out to study the conjugated convective heat transfer on the leading edge of a conical wall subjected to external cold flow and internal hot jet impingement by a single chevron nozzle. The geometric effects, including the chevron penetration depth (p/d ranging from 0.1 to 0.2) and chevron length (I/d ranging from 0.1 to 0.3) on the conjugated convective heat transfer performances were experimentally analyzed for a typical 6-chevrons nozzle under non-dimensional jet-to-leading edge distance (H/d) of 2-4 and jet Reynolds number (Re-j) of 7800-39,400. The results show that the chevron jet is proved to be capable of improving the heating effectiveness in the vicinity of the conical surface leading edge, especially under a small jet Reynolds number. For the specified zone with a chordwise length of 5d apart from the leading edge, the area-averaged heat effectiveness could be increased approximately 20% by the chevron nozzle in relative to the conventional nozzle. The heat transfer enhancement is improved with the increase of chevron penetration length for a fixed chevron length or the decrease of chevron length for a fixed chevron penetration length. The influence of chevron penetration depth or the chevron length on the specified area-averaged heating effectiveness becomes weaker gradually as the jet Reynolds number increases. For the current conditions, the non dimensional jet-to-leading edge distance seems to have little influence on the specified area-averaged heating effectiveness. (C) 2016 Elsevier Ltd. All rights reserved.

ISSN号：0017-9310

是否译文：否

发表时间：2017-03-01

合写作者：Guan, Tao,单勇,Hang, Jin

通讯作者：张靖周