2002 Fiscal Year Final Research Report Summary
Development Study of High-response Hydrogen Concentration Probe for Supersonic Flows
| Project/Area Number |
12450390
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Aerospace engineering
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
NAGATA Harunori Hokkaido Univ., Grad. School of Eng., Asso. Prof., 大学院・工学研究科, 助教授 (40281787)
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| Co-Investigator(Kenkyū-buntansha) |
ARAI Takakage Muroran Inst. Of Tech., Asso. Prof., 工学部, 助教授 (10175945)
TOTANI Tsuyoshi Hokkaido Univ., Grad. School of Eng., Inst., 大学院・工学研究科, 助手 (00301937)
KUDO Isao Hokkaido Univ., Grad. School of Eng., Prof., 大学院・工学研究科, 教授 (10281784)
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| Project Period (FY) |
2000 – 2002
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| Keywords | Scramjet Engine / Supersonic Combustion / Mixing in Share Layer / Catalytic Reaction |
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| Research Abstract |
Scramjet engine is a strong candidate for use as thrusters for space planes and supersonic civil transporter in the next generation. Supersonic mixing is a key challenge to in realizing scramjet engines. Regarding this, the main purpose of this research is to develop a simple method to evaluate hydrogen concentration in a supersonic mixing layer without the need for costly apparatus. The investigators have proposed a hydrogen concentration probe using catalytic reaction on Pt wire surface. To use this probe to detect a concentration change in a supersonic mixing layer, the response of the catalytic heat release rate must depend only on concentration change around the probe. Catalytic heat release rate on the Pt wire surface in unsteady state is measured using a constant temperature type hotwire anemometer technique and a shock tube to investigate the relation of the response of the catalytic heat release rate and Pt wire temperature. The increasing rate of the catalytic heat release depends on the Pt wire temperature when the wire temperature is low. However, the dependence is very weak when the wire temperature is over about 680 K. This shows that not the catalytic reaction but moleculartransfer from the flow to the Pt wire surface is the controlling step when Pt wire temperature is high enough. As a conclusion, catalytic reaction rate on the Pt wire is high enough comparing with the molecular transfer rate with the temperature over about 680 K, yielding high response frequency as hotwire anemometers(over a hundred kHz).
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