1998 Fiscal Year Final Research Report Summary
Study on Mechanism of Extinction and Re-ignition of turbulent Diffusion Flame by Skeletal Chemistry
| Project/Area Number |
09650234
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Thermal engineering
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
YAMASHITA Hiroshi Nagoya University , Graduate School of Engineering, Professor, 工学研究科, 教授 (40111835)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Keywords | Skeletal Chemistry / Turbulence / Diffusion Flame / Extinction / Reignition / Numerical Analysis |
|---|
| Research Abstract |
The turbulent diffusion flame is one of the most fundamental flames used in a wide variety of applications. However, combustion is an extremely complex phenomenon combining a lot of physical, chemical processes and enough elucidation is not yet done. Some problems exist in these techniques though there are a numerical calculation by the computer and an experiment by the laser measurement technology in the research technique to accomplish outstanding development recently. The Upwind difference scheme of higher-order accuracy and the skeletal chemistry based on the large detailed elementary reaction mechanism were adopted to cope with the problems of the turbulent flow model and the chemical reaction mechanism in a numerical calculation. On the other hand, the instrumentation technology which had accumulated up to now was adopted to cope with the problems of taking a picture to the fast process and the resolution on the image processing in the experiment.
Following researches were done based on such techniques.
1. First of all, the laminar counterflow diffusion flame was calculated by using the skeletal chemistry and this reaction model was clarified that enough validity was possessed. Moreover, the unsteady calculation was done and a detailed extinction process was clarified.
2. Next, the triple flame was calculated to examine the influence of the fuel equivalence ratio on the flame structure by using the skeletal chemistry, and the validity of the calculation technique for the two-dimensional flow was verified.
3. In addition, two-dimensional turbulent jet diffusion flame was calculated for the various Reynolds numbers to examine the extinction and the re-ignition of flame. Moreover, the role of each elementary process was examined.
4. The high speed and the high-resolution evaluation were measured as an experiment corresponding to a numerical calculation of the above-mentioned with an existing laser measurement system and a high-speed video camera.
|
