Development of a Simultaneous Measurement Method of Velocity, Temperature, and Concentration using a Diode Laser in a Supersonic Combustion Flow
| Project/Area Number |
11555254
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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 | 展開研究 |
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| Research Field |
Aerospace engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
KOBAYASHI Hideaki Tohoku University, Institute of Fluid Science, Associate Professor, 流体科学研究所, 助教授 (30170343)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIMORI Toshiro Ishikawajima-Harima Heavy Industries Co., Ltd.Research Laboratory, Assistant Manager, 基盤技術研究所, 課長代理(研究職)
MITANI Tohru National Aerospace Laboratory, Kakuda Research Center, Laboratory Manager, 角田宇宙推進技術研究センター, 室長(研究職)
HANAI Hironao Tohoku University, Institute of Fluid Science, Research Associate, 流体科学研究所, 助手 (30312664)
丸田 薫 秋田県立大学, システム科学技術学部, 助教授 (50260451)
じゅ 詒光 東北大学, 工学研究科, 助教授 (60261468)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥11,200,000 (Direct Cost: ¥11,200,000)
Fiscal Year 2000: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1999: ¥6,800,000 (Direct Cost: ¥6,800,000)
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| Keywords | Supersonic Combustion / Laser Diagnostics / Diode Laser / Velocity Measurement / Temperature Measurement / Concentration Measurement |
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| Research Abstract |
This research was aimed to develop a new measurement method of velocity, temperature, and concentration in supersonic combustion flow by using a compact diode laser. This method is based on the infrared absorption characteristics of H_2O molecules.
A InGaSaP diode laser was selected to detect 1.393 μm band of H_2O vibration-rotation transition. The investigation of the transition lines of H_2O molecules proved that two pairs of transition line are suitable for the temperature measurement in the range of 1300 K - 2000 K and 300 K - 1300 K separately. By collaboration research with a scientist in USA, the diode laser controller, laser corrector optics, and the measurement code were developed, and the assembling of the optical fibers and diode-laser laser optics were conducted.
By using a supersonic-combustion test facility of Institute of Fluid Science, Tohoku University, measurement tests of supersonic air-flow and the combustion flow behind a flame holding strut were conducted to confirm
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the performance of the system developed in this research. For installing the laser probes to the measurement section of the wind tunnel, AR coated optical windows, pin-hole structure, and nitrogen-purge system were employed in order to minimize the effects of the surface reflection, flame radiation, and laser absorption by surrounding air. Results of the measurements showed that, in supersonic air-flow, data of temperature and velocity agreed well with the numerically estimated values without any data compensation. H_2O concentration agreed with estimated value when the background H_2O concentration caused by the residual H_2O via the air reheater of the wind tunnel was reduced. The velocity data for the combustion region was compared with the mean velocity measured by LDV and they agreed well. H_2O concentration was also agreed well with the values estimated based on chemical equilibrium of H_2-air flames in the wake region. From these results, the accuracy and feasibility of the diagnostic method developed in this research were confirmed. Less
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Report
(3 results)
Research Products
(3 results)
