H2 concentration profile in cold supersonic hydrogen-air mixing layer - Evaluation using catalytic reaction on constant temperature Pt wire

Arai, T.; Morita, Shuji; Sugiyama, Hiromu; Nagata, Harunori

doi:10.2514/6.1998-1623

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…The authors have proposed a hydrogen concentration probe (3) - (6) as a new simple method of evaluating hydrogen concentration. This probe makes use of the catalytic reaction on the surface of platinum wire and the technique of the constant-temperature hot-wire anemometer.…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Response of Catalytic Heat Release Rate on Platinum Wire to a Shock Wave in Hydrogen-Air Mixture

Nakamura

Nagata

Totani

et al. 2005

JSME international journal. Ser. B, Fluids and thermal engineer

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The authors have proposed the use of a hydrogen concentration probe as a new simple method of evaluating hydrogen concentration. We propose a method of evaluating the rate of change of catalytic heat release in order to evaluate hydrogen concentration history for the condition under which the boundary layer is likely to be immature. By using a shock tube, the rate of increase of heat budget of platinum wire was investigated experimentally. Experimental results indicate that the rate of increase of difference due to catalytic heat release is the maximum value when the hydrogen concentration is 30%, which agrees well with a previous result. As a result, this method can be used to evaluate the rate of increase of difference due to catalytic heat release. It is clear that the rate of change due to catalytic heat release is strongly correlated with the rate of change of hydrogen concentration.

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Section: Introductionmentioning

confidence: 99%

Research on Dynamic Response of Catalytic Heat Release Rate on Platinum Wire to a Shock Wave in Hydrogen-Air Mixture

Nakamura

Nagata

Totani

et al. 2005

JSME international journal. Ser. B, Fluids and thermal engineer

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“…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%

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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H2 concentration profile in cold supersonic hydrogen-air mixing layer - Evaluation using catalytic reaction on constant temperature Pt wire

Cited by 8 publications

References 4 publications

Research on Dynamic Response of Catalytic Heat Release Rate on Platinum Wire to a Shock Wave in Hydrogen-Air Mixture

Research on Dynamic Response of Catalytic Heat Release Rate on Platinum Wire to a Shock Wave in Hydrogen-Air Mixture

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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