回転流中における火炎の安定機構 : 水素・空気混合気中に形成される管状火炎の燃焼特性

Mechanism of Flame Stability in a Rotating Flow : Combustion Characteristics of Tubular Flames in a Hydrogen/Air Mixture

Yamamoto Kazuhiro

Asai Hiroshi

Ishizuka Satoru

Onuma Yoshiaki

日本機械学會論文集. B編

The effects of rotation on the stability and structure of tubular flames have been investigated for a lean hydrogen/air mixture, and mechanism of flame stability in a rotating flow has been discussed. Results show that with increasing intensity of rotation, (1) the flame diameter increases, while thickness of the luminous zone decreases, (2) the fuel concentration at the extinction decreanes, i. e., the stable region expands, (3) the radial temperature distribution becomes an M-shaped profiles, and (4) flame temperature T_f increases near extinction. These results are almost the same as those obtained for a methane/air mixture. The mechanism for these phenomena is supposed to be explained with the coupled effects of pressure diffusion and stretch effect. The present experimental results provide very useful information for discussing the flame stability and the transport phenomena in a vortex flow.

Premixed Combustion

Swirling Flow

Stability

Extinction

Mass Transfer

Structure

Tubular Flame

Technology. Engineering [ 500 ]

jpn

一般社団法人日本機械学会

社団法人日本機械学会

本文データは学協会の許諾に基づきCiNiiから複製したものである

[ISSN] 0387-5016

[NCID] AN00187441

[NAID] 110002397203 isVersionOf