Gaseous film cooling investigation in a multi-element splash platelet injector. (March 2018)

• Record Type: Journal Article
• Authors: Yin, Liang; Liu, Weiqiang
• Is Part Of: Acta astronautica. Volume 144(2018)
• Page Start: 353
• Page End: 362
• Publication Date: 2018-03
• Subjects: Splash platelet injector -- Film cooling -- GCH4 -- Wall temperature distribution -- Cooling effect; Astronautics -- Periodicals; Outer space -- Exploration -- Periodicals; Astronautics; Periodicals; 629.405
• DOI: 10.1016/j.actaastro.2017.12.045
• Languages: English
• ISSNs: 0094-5765

Abstract

Abstract: Film cooling is an effective technique that protects chamber walls in rocket combustion against chemical attacks and heat fluxes. This study discusses cooling effect in a multi-element GO2 /CH4 splash platelet injector. Influence parameters, such as slot height, slot number, percentage of coolant, and injection position on cooling effect, were investigated. GCH4 with 298.15 K was applied as film coolant. In the first step, slot heights of 0.2 and 0.4 mm were compared by applying a constant film mass flow rate. Temperature, CH4 mole fraction distribution, and flow field structure were obtained. The effects of slot number, percentage of coolant, and injection position on wall temperature distribution were then determined. Finally, the reasons for the low cooling efficiency were analyzed. Improvement in the method is proposed to achieve improved cooling effect for splash platelet injectors. Highlights: A splash platelet injector with film cooling slot was designed. An eddy dissipation concept with a reduced O2 /CH4 mechanism was considered. Slot height, slot number, percentage of coolant and injection position were examined. A significant contribution to the understanding of film cooling for platelet engines.