Flow and thermal analyses of regenerative cooling in non-uniform channels for combustion chamber. (5th June 2017)

• Record Type: Journal Article
• Authors: Jing, Tingting; He, Guoqiang; Li, Wenqiang; Qin, Fei; Wei, Xianggeng; Liu, Yang; Hou, Zhiyuan
• Is Part Of: Applied thermal engineering. Volume 119(2017)
• Page Start: 89
• Page End: 97
• Publication Date: 2017-06-05
• Subjects: Thermal protection -- Engine -- Regenerative cooling -- Flow uniformity -- Conjugated heat transfer; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2017.03.062
• Languages: English
• ISSNs: 1359-4311

Abstract

Abstract: Regenerative cooling is considered one of the most prospective thermal protection techniques in hypersonic vehicles. However, the non-uniform flow distribution in the cooling channels has the potential to lead the combustion chamber to overheat. In the present study, the regenerative cooling channels designed in a variety of non-uniform patterns are proposed. The conjugated flow and heat transfer behaviors of coolant and solid combustion chamber are numerically investigated. The scaling factor (Ω), i.e., height/width ratio, channel inlet/outlet manifold configuration, and relative angle ( ω ) of the inlet/outlet tube on flow and heat transfer characteristics are discussed. The numerical prediction is in reasonable agreement with previous numerical and experimental data. Results reveal that the basic configuration (Ω = 1) contributes dramatic non-uniform flow in the channels near the inlet tube. The non-uniformity becomes more evident in the case of ω = 60°. The scaling factor (Ω) exerts stronger influence on flow distribution in channels and the reformed case of Ω = 0.9 for Ch-1–4 gives the best flow uniformity and temperature distribution. The flow distribution is less sensitive to the outlet manifold than the inlet manifold.