乱流拡散火炎に及ぼす重力の影響

フォーマット:

論文

責任表示:

石井, 哲人 ; 佐藤, 博之 ; 天谷, 賢児 ; 新井, 雅隆

言語:

日本語

出版情報:

日本機械学会, 2006-01-25

著者名:

• 石井, 哲人
• 佐藤, 博之
• 天谷, 賢児
• 新井, 雅隆

掲載情報:

日本機械学會論文集. B編

ISSN:

0387-5016    

巻:

72

通号:

713

開始ページ:

194

終了ページ:

201

バージョン:

VoR

概要:

application/pdf<br />Journal Article<br />The effects of gravity on the fluctuation characteristics of turbulent diffusion flames were experimentally investigated. Super gravity fields were formed using a spin tester. The gravity level G was changed from 1 to 20, where G was defined as the value of super gravity per normal gravity. Flame states such as laminar, flickering and turbulent flames were observed under the various conditions of … gravity level, G and Reynolds number, Re. The transition from laminar to turbulent and blow out limit were summarized on a G-Re map. Characteristics of turbulent fluctuation were measured by a laser light reflection method. Power spectra and auto-correlations were derived from the signal of laser intensity. As the result, it was found that the turbulent flame was begun to periodic oscillation with increasing the gravity level. Time scale of turbulent fluctuation in the super gravity became long than that in the normal gravity. Spectrum component in power spectrum shifted to the low frequency side when the gravity level became high. And the full width at half-maximum of autocorrelation peak became wider in the super gravity conditions. 続きを見る