Affiliation of Author(s):能源与动力学院
Journal:Tuijin Jishu
Abstract:To improve the effects of cross-flow and the usage of coolant heat sinks, the numerical simulation is carried out in the present study for a typical heat transfer unit in a new type of suspending tube cooling structure of a blade tip clearance control system. The effects of some key parameters are studied on the heat transfer characteristics of the cooling structure, such as the impinging Reynolds number, distance of jet to jet and outflow type. It is found that a phenomenon of 'fountain flow' appears formed by the interaction of adjacent impinging jets of suspending tubes. With decreasing the impinging Reynolds number and increasing the distance of jet to jet, the heat transfer on the target is weakened and the phenomenon of 'fountain flow' is no more significant. Due to the space limitation caused by the suspending tubes and the cover plate, the circumferential and axial cross-flows are formed in impinging chamber. When the coolant flow exits from the side of the case, the axial cross-flow is most significant on the casing surface. Compared to the outflow from the side of the case, the heat transfer between the two high ribs is enhanced considerably when the outflow is from the top of the case, or from both the top and the side of the case. A maximum increase is up to around 20% when the outflow is from the top. © 2019, Editorial Department of Journal of Propulsion Technology. All right reserved.
ISSN No.:1001-4055
Translation or Not:no
Date of Publication:2019-02-01
Co-author:Zhang, Yang,Liu, Yuan-Jian,Li, Rui,lzh,Liu, Zhao-Ying
Correspondence Author:Zhang, Yang,mao junkui