Experimental investigation of inclined hydrogen injection into a supersonic flow

Arai, T.; Fukuzoe, Hideo; Miura, Junji; Nagata, Harunori; Hosokawa, Hiroshi

doi:10.2514/6.1999-4915

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…3,7,[11][12][13][14][15][16][17] We used it to investigate the timeaveraged mixing conditions of the 2-D hydrogen-air supersonic mixing layer in previous studies. 15,16) We clarified that…”

Section: Introductionmentioning

confidence: 99%

“…For example, the freestream remains supersonic in the combustor, so mixing of fuel jets with the freestream must be quick. Some injection schemes to enhance the mixing for the SCRAMJET have been suggested, [2][3][4][5][6][7][8][9][10][11] such as wedge shaped injector schemes 2,3) and their derivations, 4,5) rampinjector schemes 6,7) and their derivations 8,9) and inclined-injector schemes. 10,11) It is important to evaluate the mixing condition in the SCRAMJET in order to suggest or develop these injection schemes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Correlation between Mass Flux Fluctuation and Fluctuation of Hydrogen Concentration in 2-D Air-Hydrogen Supersonic Mixing Layer

Sakima

Arai²,

Edward

et al. 2005

Trans. Japan Soc. Aero. S Sci.

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An experiment was carried out to confirm the validity of time series evaluation of supersonic mixing conditions by using the catalytic reaction on a platinum wire. Gaseous hydrogen was injected parallel to a supersonic freestream (M 1 % 1:81) from a slit injector, located at a backward-facing step. The time series condition of supersonic mixing was evaluated using a W-type probe with a platinum wire and a reference (nickel) wire. The evaluation was done by simultaneously measuring each electric power supplied by each electric circuit keeping the temperature of the wire constant. Electric power supplied to the Pt wire depended on the catalytic heat release rate (giving hydrogen concentration) and flow convection. Meanwhile electric power supplied to the Ni wire depended on flow convection. The results show that the correlation coefficient between these electric powers increased as mixing developed. Investigations were also conducted for the cases of helium, air, and no secondary injectant to compare with the hydrogen-injectant case. The results indicate that this evaluation method can measure the time-series behavior of the air-hydrogen supersonic mixing layer or coherent motion of turbulence.

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“…3,7,[11][12][13][14][15][16][17] We used it to investigate the timeaveraged mixing conditions of the 2-D hydrogen-air supersonic mixing layer in previous studies. 15,16) We clarified that…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Correlation between Mass Flux Fluctuation and Fluctuation of Hydrogen Concentration in 2-D Air-Hydrogen Supersonic Mixing Layer

Sakima

Arai²,

Edward

et al. 2005

Trans. Japan Soc. Aero. S Sci.

Self Cite

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show abstract

“…[2][3][4][5][6][7][8][9] For example, a ramp injector is one of the schemes to enhance mixing by using induced vorticity. [2][3][4] An inclined injection scheme was suggested to reduce the total pressure loss of the freestream.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] An inclined injection scheme was suggested to reduce the total pressure loss of the freestream. 5,6) Meanwhile, a wedge shaped injector [7][8][9] was developed to minimize both total pressure loss and jet-boundary layer interaction. Regarding investigations about wedge injectors, as far as we know, gaseous hydrogen has not been used as the injectant in the previous studies.…”

Section: Introductionmentioning

confidence: 99%

“…We have developed a new mixing condition evaluation method as described in our previous papers. 4,6,[10][11][12][13][14][15] It was conducted by using a catalytic reaction on a platinum wire. In the previous studies, it was used to quantitatively inves-Ó 2004 The Japan Society for Aeronautical and Space Sciences tigate the mixing condition of a two-dimensional hydrogenair supersonic mixing layer.…”

Section: Introductionmentioning

confidence: 99%

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Mixing of a Hydrogen Jet from a Wedge Shaped Injector into a Supersonic Cross Flow

Sakima

Arai²,

Kasahara³

et al. 2004

Trans. Japan Soc. Aero. S Sci.

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A new measurement by using a catalytic reaction on a platinum wire was conducted spatially to evaluate a mixing condition in a supersonic flow field. A spatial mixing field was created by a transverse hydrogen jet injected into a cold supersonic cross flow (Mach 1.81) through a wedge shaped injector. The half-vertical angles of 8 or 18 were chosen as that of the wedge shaped injector. These results were compared with that of a circular injector case. The results showed that this method could evaluate a spatial mixing condition. The results also clarified that a jet plume in the cases of wedge injectors penetrated higher than that of the circular injector case and separate from the lower wall when going downstream. To observe jet/supersonic flow interaction, Schlieren visualization and oil flow visualization were carried out. It was shown that the extent of the separation region around the 8 wedge injector was the smallest among those injectors. Pitot pressure measurements were also conducted. These indicated that a wedge injector scheme was more beneficial than that of a circular injector for the supersonic combustion and combustor wall cooling.

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Time series evaluation of 2-D air and hydrogen supersonic mixing layer by using catalytic reaction

et al. 2005

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Experimental investigation of inclined hydrogen injection into a supersonic flow

Cited by 10 publications

References 7 publications

Correlation between Mass Flux Fluctuation and Fluctuation of Hydrogen Concentration in 2-D Air-Hydrogen Supersonic Mixing Layer

Correlation between Mass Flux Fluctuation and Fluctuation of Hydrogen Concentration in 2-D Air-Hydrogen Supersonic Mixing Layer

Mixing of a Hydrogen Jet from a Wedge Shaped Injector into a Supersonic Cross Flow

Time series evaluation of 2-D air and hydrogen supersonic mixing layer by using catalytic reaction

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