1998 Fiscal Year Final Research Report Summary
Advancement of Multidimentional Imaging for the Clarification of Thermofluid Phenomena
| Project/Area Number |
08305006
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
KAMIMOTO Takeyuki Faculty of Engineering, Tokyo Institute of Technology, Professor, 工学部, 教授 (00016429)
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| Co-Investigator(Kenkyū-buntansha) |
MAEDA Masanobu Faculty of Science & Engineering, Keio University, Professor, 理工学部, 教授 (90051466)
NISHINO Koichi Graduate School of Engineering, Yokohama National University, Associate Professo, 大学院・工学研究科, 助教授 (96550230)
NIIMI Tomohide Graduate School of Engineering, Nagoya University, Associate Professor, 大学院・工学研究科, 助教授 (70164522)
KOBAYASHI Toshio Institute of Industrial Science, University of Tokyo, Professor, 国際・共同研究センター, 教授 (50013206)
FUJIMOTO Hajime Faculty of Engineering, Doshisha University, Professor, 工学部, 教授 (90051630)
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| Project Period (FY) |
1996 – 1998
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| Keywords | Imaging / PIV / Cross-Correlation PIV / Laser Induced Fluorescence / Spectrum Analysis / Laser Speckle / Multiphase Flow / 混相流 |
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| Research Abstract |
Multidimensional imaging in the studies of thermofluid dynamics aims at visualizing or quantifying instantaneous distributions of velocity, temperature and concentration. As for velocity measurement, PIV (Particle Imaging Velocimetry) which tracks small particles suspended in the flow allowed three dimensional velocity measurement with the help of Holographic technique. A cross- correlation PIV was used to measure the temporal and spatial characteristics of turbulence in a turbulent circular jet, and the result showed a good agreement with that measured by the hot wire anemometry. A technique for the simultaneous measurement of velocity and particle size of droplets in a spray was developed which employs LIF (Laser Induced Fluorescence) technique and high resolution digital image analysis.
Measurement of temperature in a fluid made a great progress which uses LIF techniques. A newly developed technique which focuses on LIF spectrum of oxygen in the air generated by a wide range ArF laser made it possible to measure the temperature as high as 5000K with an error of 25K.Another technique which measures the ratio of intensities of Iodine LIF signals at two wave lengths permitted the measurement of temperature distribution in a high speed gaseous jet. In addition, temperature distribution in the flow in a micro-channel was measured in success using the exciplex LIF technique.
Regarding the concentration measurement, a method was developed which measures velocity and concentration simultaneously at multipoints using PIV and LIF, and the distributions of vorticity and concentration was correlated quantitatively. LIF technique focusing on pholmaldehyde was applied to a reacting fuel spray in a high temperature environment and the ignition process has been imaged for the first time.
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