イメージインテンシファイアを用いた渦輪中の伝ぱ火炎の観察 : 熱工学, 内燃機関, 動力など

Observations of the Propagating Flames in Vortex Rings Using an Image Intensifier

Morimoto Youhei

Ikeda Mio

Maekawa Takuya

Ishizuka Satoru

Taki Shiro

日本機械学會論文集. B編

Using a high-speed video camera with an image intensifier, observations have been made on the propagating flames in the vertex rings. From their intensified images, variations of the flame speed and the flame diameter along the vortex axis have been determined. Results show that there are four types of flame propagation, (1) steady flame propagation, (2) periodic flame propagation, (3) unsteady flame propagation, and (4) random flame propagation. The steady flame propagation occurs for the maximum tangential velocity V_<θmax>>7 m/s (Re<__-10^4) and its local flame speed is almost constant during the propagation. The periodic flame propagation is originated from the longitudinal instability of the vortex ring, which occurs around V_<θmax> &ap; 7 m/s in this experiment. (3) The unsteady flame propagation is accompanied with strong flame acceleration and deceleration, while its mean flame speed from ignition to the end is almost equal to the maximum tangential velocity. The random flame propagation occurs in turbulent vortex rings. The flame speed changes randomly. The luminous zone is quenched shortly behind the flame and its mean flame speed becomes much lower than the maximum tangential velocity.

Flames

Flame Speed

Flame Propagation

Vortex Ring

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] 110002397461 isVersionOf