Experimental characterization of strain and curvature effects on the instantaneous structure of lean premixed turbulent methane-air flames
30th International Symposium on Combustion, Abstracts of Works-in-Progress Poster Presentations, Chicago, IL, Amerika Birleşik Devletleri, 25 - 30 Temmuz 2004, ss.199, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Basıldığı Şehir: Chicago, IL
- Basıldığı Ülke: Amerika Birleşik Devletleri
- Sayfa Sayıları: ss.199
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
The aim of the present work is to improve the understanding of lean premixed turbulent flames. Average and instantaneous flame characteristics were studied for varying equivalence ratio and turbulence parameters of turbulent lean methane-air open conical flames, where the turbulence structure was generated by perforated plates and the flame stabilized by a pilot flame. A statistical study of instantaneous flame front curvatures was performed. Maximum temperature gradients and those corresponding to preheating regions of instantaneous flame fronts were considered. When the flamelet was subjected to the combined effect of strain and curvature, the instantaneous temperature gradients were reduced compared to strained laminar flame computations. When the curvature was zero and the strain acted alone, the instantaneous temperature gradients within the flamelet were increased compared to strained laminar flame computations. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).