2024-03-29T00:33:17Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00007657
2023-01-16T03:53:07Z
320:321:322
Numerical Study on Unsteady Two-Dimensional Premixed Flame Using Elementary Reaction Mechanism (The Validity of Progress Variable and Its Gradient as Descriptor of Premixed Flame Structure)
二次元非定常予混合火炎に関する素反応機構による数値解析 (予混合火炎構造を支配する物質量としての反応進行度とその勾配の妥当性)
加藤, 敏宏
21673
KATOH, Toshihiro
21674
林, 直樹
21675
HAYASHI, Naoki
21676
山下, 博史
21677
YAMASHITA, Hiroshi
21678
中村, 祐二
21679
NAKAMURA, Yuji
21680
山本, 和弘
21681
YAMAMOTO, Kazuhiro
21682
Premixed Flame
Unsteady Behavior
Progress Variable
Flame Curvatute
Flame Propagation Direction
Numerical Analysis
The flame structure of unsteady two-dimensional premixed flame is numerically simulated with elementary reaction mechanism. In order to investigate unsteady behavior, a sinusoidal fluctuation is added to the inlet velocity of methane-air premixed mixture as follows: u0=um{1+A・sin(2πky)・sin(2πft)}. The average volocity um is 1.25-2.00 m/s, the amplitude A is fixed to 1.0, the frequency f is 100, 250, 500 Hz, and the wavenumber k is 0.1-0.4 mm^-1. The Smooke's skeletal mechanism is adopted as the elementary reaction mechanism. The equivalence ratio is fixed to 0.75. The unsteady behavior and flame structure of premixed flame are examined by using the progress variable defined with mass fraction of oxidizer Cq and its gradient (dC/dn)q at flame front. The obtained results are as follows: The total heat release rate, the temperature gradient, the maximum concentration of species are determined by Cq and (dC/dn)q. Consequently, they are the most important descriptors of premixed flame which dominate the flame structure of premixed flame. The unsteady behavior is classified by the flame curvature and the flame propagation direction, and the classified regions are related to Cq and (dC/dn)q.
journal article
日本機械学会
2005-12-25
application/pdf
日本機械学會論文集 B編
712
71
3038
3045
http://hdl.handle.net/2237/9362
0387-5016
https://nagoya.repo.nii.ac.jp/record/7657/files/JsMecEngB_71-712-3038.pdf
jpn
http://ci.nii.ac.jp/naid/110005051770
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。