Investigation on 3-Dimensional Effect of Shock Waves Caused by a Strut-Cowl System in a Scramjet Engine

Sato, Shigeru; Munakata, Toshihiko; Ishikawa, Miyuki

doi:10.2514/6.2010-7037

Cited by 3 publications

(6 citation statements)

References 5 publications

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“…M6S43 is reported by Sato et.al. 18 The CFD result agrees well with the experiment. 18 Figure 4, 5 and 6 show the stream lines in the base flow of the strut in 5/5-Height Strut configuration and the Boat-tail Strut configuration.…”

Section: ⅳ．Resultssupporting

confidence: 86%

“…The improvements are reducing the strut drag and bringing the fluid residence time in the base flow of the strut with keeping the hot triangle. 18 In the comparison of the mass flux distributions, the Boat-tail Strut configuration produces the distribution relatively close to plain distribution. If the fuel can be injected into the core of this mass flux, the fuel equivalence ratio distribution, higher near the side walls and the top wall, found in the 5/5-Height Strut configuration 4 may be relaxed.…”

Section: B Mass Flux Distribution Along the Enginementioning

confidence: 86%

“…The outline of the grid system is shown in the literature. 18 These calculations were performed on the supercomputer system "Numerical Space Engine" (till 2008) of Kakuda Space Center and on JAXA's present Supercomputer System "JSS". …”

Section: ⅲ．Calculation Methodsmentioning

confidence: 99%

“…The effect on engine performance difference is minutely considered of the interaction of the shock wave caused by the cowl leading edge and shock waves caused by the strut leading edge, and the hot triangle is found. 18 And three applications of the hot triangle are reported. 19 In this paper two engine configurations which have different strut shapes are investigated by means of CFD.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Fluid Transport brought by a Strut-Cowl System in a Scramjet Engine

Sato

Fukui²,

Watanabe

et al. 2013

49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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Japan Aerospace Exploration Agency (JAXA) has been investigating scramjet engines inKakuda Space Center using Ram Jet Engine Test Facility (RJTF) et al. The engine tested at the flight condition of Mach 6 in RJTF showed very important characteristics depending on internal geometry. The authors found in the result of CFD research that a "hot triangle" is caused by 3-dimensional interaction of the cowl shock wave and the strut shock wave and that the hot triangle contributes to intensive combustion transition. Based on this hot triangle, an engine configuration with boat-tail strut is compared to that with 5/5-height strut which showed good thrust performance in the engine test. CFD is carried out to solve the inner air flow, and the two configurations are compared in the view point of the superiority of scramjet engine. It is found that fluid is transported from the top wall side to the cowl side automatically in the base flow behind the strut. Especially in the configuration with boat-tail strut produces a large circulation there. It suggests that the base flow behind the boat-tail strut can promote the uniformity of fuel distribution.

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Section: ⅳ．Resultssupporting

confidence: 86%

Section: B Mass Flux Distribution Along the Enginementioning

confidence: 86%

Section: ⅲ．Calculation Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Fluid Transport brought by a Strut-Cowl System in a Scramjet Engine

Sato

Fukui²,

Watanabe

et al. 2013

49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

Self Cite

View full text Add to dashboard Cite

Japan Aerospace Exploration Agency (JAXA) has been investigating scramjet engines inKakuda Space Center using Ram Jet Engine Test Facility (RJTF) et al. The engine tested at the flight condition of Mach 6 in RJTF showed very important characteristics depending on internal geometry. The authors found in the result of CFD research that a "hot triangle" is caused by 3-dimensional interaction of the cowl shock wave and the strut shock wave and that the hot triangle contributes to intensive combustion transition. Based on this hot triangle, an engine configuration with boat-tail strut is compared to that with 5/5-height strut which showed good thrust performance in the engine test. CFD is carried out to solve the inner air flow, and the two configurations are compared in the view point of the superiority of scramjet engine. It is found that fluid is transported from the top wall side to the cowl side automatically in the base flow behind the strut. Especially in the configuration with boat-tail strut produces a large circulation there. It suggests that the base flow behind the boat-tail strut can promote the uniformity of fuel distribution.

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“…[18][19][20][21] The authors are focusing the influence of strut-cowl system shock wave on the fuel distribution by using CFD, and have found advantages of configuration with a strut. 21,22 The authors describe here the result of virtual experiments for optimization of fuel distribution in a scramjet engine using streamlines in CFD simulations based on the experimental data obtained in RJTF, JAXA.…”

mentioning

confidence: 99%

Virtual Experiment for Optimization of Fuel Distribution in a Scramjet Engine

Sato¹,

Fukui²,

Watanabe³

et al. 2015

20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference

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Japan Aerospace Exploration Agency (JAXA) has been investigating scramjet engines in KakudaSpace Center using RamJet Engine Test Facility (RJTF) et al. The engine tested at the flight condition of Mach 6 showed very steep fuel distribution. The authors are researching the influence of shock wave from strut-cowl system on the fuel distribution by using CFD based on RJTF tests, and have found advantages of strut in the engine. Here describe the authors the result of virtual experiments for optimization trial of fuel distribution in the engine by means of tracing back along streamlines in the view point where to set the fuel injection positions in order to let the fuel go into high mass flux area in the engine.Ⅰ．Introduction n hypersonic air-breathing engine researches many different trials have been done in order to obtain better propulsion performance or to create new systems. 1-4 In Japan since around 1985 National Aerospace Laboratory (present JAXA) has been carrying out scramjet engine research, and Ramjet Engine Test Facility (RJTF) was built in Kakuda Research Center (present Kakuda Space Center) in 1993 for the research.Kakuda Space Center has been conducting the scramjet engine tests for flight condition of Mach 4, 6, 8 and the higher in RJTF and another facility respectively. [5][6][7][8][9][10][11][12][13][14][15] In the scramjet engine tests carried out in the RJTF it has been found that the difference of engine inner configuration, mainly strut shape, produces large difference of thrust performance in the condition of Mach 6. 5 In addition to the above it has been also found that the fuel cannot spread all over the engine cross section and concentrates to the top wall side. 5 Some fraction of the fuel is exhausted without burning and does not contribute the thrust production. This prevents the engine from fully performing. Optimization for the fuel distribution is needed.In this viewpoint researches have been made on fuel injection for scramjet engines. Roughly classifying, they are a) how I 1 Senior Researcher,

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