Experimental Study of Vitiation Effects on Combustion Characteristics of a Supersonic Combustor. Issue 9 (2nd September 2017)

• Record Type: Journal Article
• Authors: Wang, Yanhua; Song, Wenyan; Shi, Deyong; Fu, Qiang; Wang, Yuhang
• Is Part Of: Combustion science and technology. Volume 189:Issue 9(2017)
• Page Start: 1500
• Page End: 1509
• Publication Date: 2017-09-02
• Subjects: Combustion characteristic -- Experiment -- Scramjet -- Vitiation effects; Combustion -- Periodicals; Combustion engineering -- Periodicals; 541.36105
• DOI: 10.1080/00102202.2017.1305368
• Languages: English
• ISSNs: 0010-2202

Abstract

ABSTRACT: An experimental study was conducted to characterize the effects of vitiate species (H2 O and CO2 ) on supersonic combustion. These species were added to an initially clean airflow that was supplied by an electrically heated direct-connected facility. Wall pressures were measured by pressure sensors, combined with combustion optical images, and the influence of major vitiate species (H2 O and CO2 ) on supersonic combustion was analyzed. Experimental results showed that the presence of vitiate species decreased combustor pressures by 3% to 30% for the same fuel equivalence ratio. The combustion flame images indicated that the flame-spreading angle decreased with the increase of the molar fraction of H2 O and CO2, and when the molar fraction of CO2 was increased to 3.5%, an illogical oscillation, specifically embodying as the flame round switching between the upstream cavity and the downstream cavity, could be observed in the combustion, which might possibly cause the flame extinction.