Observation of stagnation-flow premixed-spray flame structure by high-speed imaging and local chemiluminescence measurement (Effects of oxygen concentration in gaseous phase on flame behavior)

被引：0

作者：

Saitoh, Hiroyasu ^{[1
]}

Akamatsu, Fumiteru ^{[1
]}

Katsuki, Masashi ^{[1
]}

机构：

[1] Department of Mechanical Engineering, Osaka University, 2-1 Yamadaoka, Suita-shi, Osaka, 565-0871, Japan

来源：

Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2003年 / 69卷 / 684期

关键词：

Chemiluminescence - Combustion - Composition effects - Flow of fluids - Free radicals - Gases - Image analysis - Laser applications - Liquid fuels - Oxygen - Particle size analysis;

D O I：

10.1299/kikaib.69.1943

中图分类号：

学科分类号：

摘要：

We conducted an experimental observation of polydisperse premixed-spray flames of kerosene in a stagnation flow. For monitoring behaviors of fuel droplet and flame we adopted laser sheet visualization consisting of a high-speed digital CCD camera and Ar-ion laser, and OH-radical and CH-band emissions detected from local region in the vicinity of propagating flame by using a light-collecting probe. Three flames with different oxygen concentration in gaseous phase (21%, 19% and 17%) were examined. These flames had the same initial droplet size-distribution measured by Phase Doppler Anemometry at the burner exit, and all the other experimental conditions were kept same except oxygen concentration. In the case of oxygen concentration of 21%, various shape of spray boundary was formed depending on time, and combustion reaction zone overlapped considerably with spray area. On the other hand, in the case of 17%, the flame showed relatively flat-shaped spray boundary. Furthermore, we compared these flame behaviors and structures with those of premixed-spray flames we had observed before.

引用

页码：1943 / 1950