Comparison of Scramjet Engine Performance in Mach 6 Vitiated and Storage-Heated Air

Mitani, Tohru; Hiraiwa, Tetsuo; Sato, Shigeru; Tomioka, Sadatake; Kanda, Takeshi; Tani, Kazuo

doi:10.2514/2.5228

Cited by 106 publications

(28 citation statements)

References 15 publications

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“…Compared with experimental and numerical results referred to [6][7][8][9][10][11][12][13][14], the essential tendency of vitiation effects on scramjet performance is identical, which evidenced that the method based on thermodynamic cycle analysis can validate and predict ground test results effectively and offer forecast when choosing simulation criterions and heating mediums. Therefore, this method will economize lots of costs and time.…”

Section: Calculated Resultsmentioning

confidence: 99%

“…It was discovered that as the increase of the level of H 2 O, CO 2 or H 2 O and CO 2 in vitiated air, the pressure rise due to combustion and isolator shock train length decreased and the combustion mode might be changed [10]. The fuel equivalence ratio at which mode transition takes place raised when compared with clean air [11,12], and the influence of water and carbon dioxide on combustor performance was nonlinear as the concentration of vitiation species increased [13]. Li Jianping et al [14] made two-dimensional calculations of kerosene-fueled supersonic combustion, finding that the presence of vitiation components lead to combustor performance deterioration characterized by the decrease of temperature rise, combustion efficiency and stream wise impulse relative to those in clean air.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Air Vitiation on Scramjet Performance Based on Thermodynamic Cycle Analysis

Chang¹

2014

J Aeronaut Aerospace Eng

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The influences of air vitiation on scramjet performance were studied in this paper based on thermodynamic cycle analysis. By the aid of NASA Glenn's computer program Chemical Equilibrium with Applications (CEA), parameters of vitiated air at combustion heater exit could be calculated. Based on thermodynamic cycle analysis, scramjet performance, including internal thrust, specific thrust, and specific impulse, were analyzed with 9 simulation criterions under Mach 4.5 and 6.5 conditions, respectively. The results show that, (1) specific heat and specific heat ratio of vitiated air are mainly affected by combustion heating medium, and also have minor connection with temperature criterions. Moreover, choosing different simulation criterions influences the temperature or pressure between clean air and vitiated air significantly; (2) the internal thrust and specific thrust of scramjet with hydrogen heated airstream are greater than that of scramjet with alcohol and kerosene heated airstream; (3) matching static pressure and dynamic pressure will obtain higher internal thrust compared to total pressure, and the effect of pressure criterions on internal thrust is more remarkable than temperature criterions. On the other hand, these findings proved that the method based on thermodynamic cycle analysis is a simple, dependable, and effective approach to evaluate the scramjet performance affected by air vitiation.

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Section: Calculated Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Air Vitiation on Scramjet Performance Based on Thermodynamic Cycle Analysis

Chang¹

2014

J Aeronaut Aerospace Eng

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“…6a-6c shows the distributions of the local equivalence ratio, local combustion efficiency, and local Mach number, respectively. They are calculated with the mole fraction in the sampled gas 14) . The broken lines in the figures indicate the positions of rockets.…”

Section: Properties At the Exit Planementioning

confidence: 99%

Ramjet-Mode Operation in a Combined Cycle Engine Combustor

Kato¹,

Kudo²,

Murakami³

et al. 2009

Trans. JSASS Space Tech. Japan

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A rocket-ramjet combined-cycle engine was tested in ramjet-mode. The combustor model had two rockets in the combustor section. They were used as an igniter in this operation mode. In the preliminary tests, the downstream combustion ramjet-mode was demonstrated with a 1.4-degree of divergent duct condition. In this study, the upstream and downstream combustion ramjet-mode operations were applied to the combined cycle engine model with large angle of divergent duct condition. In the case of upstream combustion ramjet-mode, the combustion condition at the exit of the combustor showed high combustion efficiency.

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“…Some previously experimental tests showed that considerable thrust reductions occurred with engine un-start (1) . They also showed that the flow speed in the combustor reduced from supersonic to subsonic due to a pseudo shock wave, PSW for short, as to increasing fuel equivalence ratios (1) . This flow mode-transition from supersonic to subsonic is known as a dual-mode transition.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Mode Transition in a Supersonic Combustor

Noda

Murakami

Kudo

et al. 2013

JTST

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A quasi-one dimensional calculation was carried out to figure out supersonic combustor performances. Three flow tubes were considered in the combustor region. Those were an air-flow-tube, a combustion-flow-tube and a fuel-flow-tube. A Mach=1 condition was assumed in the combustion-flow-tube. The estimation of a mode-transition was considered as a result of thermal choking. Both clean and vitiated inflows were tested with the calculation model. Experimental combustion tests were also carried out to compare and confirm the validity of calculated results. Mode-transition equivalence ratios and combustor wall pressure distributions were focused to compare between calculated and experimental results. The calculation model estimated the mode-transition equivalence ratio and the thrust performance with the relative errors at about 11% and 6% compared to the experimental results, respectively.

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Comparison of Scramjet Engine Performance in Mach 6 Vitiated and Storage-Heated Air

Cited by 106 publications

References 15 publications

Effects of Air Vitiation on Scramjet Performance Based on Thermodynamic Cycle Analysis

Effects of Air Vitiation on Scramjet Performance Based on Thermodynamic Cycle Analysis

Ramjet-Mode Operation in a Combined Cycle Engine Combustor

Estimation of Mode Transition in a Supersonic Combustor

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