| Project/Area Number |
09450090
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Thermal engineering
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
YOSHIKAWA Norihiko Nagoya University, School of Engineering, Associate Professor, 工学研究科, 助教授 (60135423)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SHIRAISHI Hiroyuki Nagoya University, School of Engineering, Research Associate, 工学研究科, 助手 (50273272)
LEBLANC E,Joseph Nagoya University, School of Engineering, Research Associate, 工学研究科, 助手 (30283419)
ENDO Takuma Nagoya University, Center for Integrated Research in Science and Engineering, Associate Professor, 理工科学総合研究センター, 助教授 (90232991)
|
|---|
| Project Period (FY) |
1997 – 1999
|
| Project Status |
Completed (Fiscal Year 1999)
|
| Budget Amount *help |
¥10,800,000 (Direct Cost: ¥10,800,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1997: ¥6,800,000 (Direct Cost: ¥6,800,000)
|
|---|
| Keywords | Free Radicals / Spectroscopy / Ignition / Combustion |
|---|
| Research Abstract |
Injection of free radicals into fresh gas mixtures enhances the ignition mechanism. There are two ways to inject free radicals. One way is to inject hot burned gas into fresh mixture. The other is to generate free radicals using ultra-violet photochemical dissociation of molecules. The present research pursued the fundamental aspects of these ignition phenomena. The main conclusions are summarized below.
(1) Simulation of ignition phenomena in ozone-oxygen mixtures
Reaction mechanism of ozone-oxygen mixtures for the cases of high-temperature and/or O radicals injection are analyzed assuming uniform constant volume conditions. Time evolutions of non-uniform flow fields of initial distributions of temperature and O radical concentrations are also analyzed. The distinguishing conditions between volumetric ignition and point ignition are obtained.
(2) Effects of free radicals injection in hydrogen-oxygen mixtures
Reaction enhancements by injection of O, H, OH radicals are comparatively discussed with heated ignition in the gas mixture. The reaction process is divided into the induction process and the thermal explosion process. The ignition by free radicals injection requires 0.1-1% of the initial enthalpy of the heated gas mixture. This means the free radicals injection method has a great advantage over the conventional point source ignition methods like spark, pilot flame, etc.
(3) Laser ignition in hydrogen-oxygen-nitrogen dioxide
The ultra-violet irradiation of 355nm of the 3rd harmonic of Nd : YAG laser is used to induce the photochemical dissociation of nitrogen dioxide to oxygen atom and nitric oxide. Volumetric ignition of the mixture is achieved due to the reaction enhancement. The ignition phenomena are observed by high-speed photography. The experimental results are compared with the computational analysis.
|
