NUMERICAL INVESTIGATIONS ON FLASHBACK LIMITS OF PREMIXED METHANE-HYDROGEN-AIR LAMINAR FLAMES
23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022, İstanbul, Türkiye, 26 - 30 Haziran 2022, ss.1206-1208, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Basıldığı Şehir: İstanbul
- Basıldığı Ülke: Türkiye
- Sayfa Sayıları: ss.1206-1208
- Anahtar Kelimeler: Flame flashback, Hydrogen, Laminar premixed flames, Numerical simulations, OpenFOAM
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
Premixed laminar methane-hydrogen combustion contains a potential flashback risk, which may be detrimental for home appliances. The present study investigates the effect of hydrogen addition to methane-air premixed laminar flames with two-dimensional transient computations performed by the CFD code OpenFOAM. The effect of wall temperature on flame flashback propensity is examined. After a stabilized flame is achieved, flashback conditions are approached by gradually decreasing the inlet premixture bulk velocity. At flame flashback velocities, flame symmetry is found to be broken because of the oscillations at the flame leading edge. Flashback tendency is found to be increasing with increasing wall temperature and increasing hydrogen addition rate. Flashback limits for 600K wall temperature case are calculated as 0.368 m/s, 0.62 and 0.99 m/s for 0 mol%, 10 mol% and 20 mol% of H2 additions to CH4-air mixture respectively. For 300K wall temperature case, they are calculated as 0.165 m/s, 0.265 m/s and 0.44 m/s for 0 mol%, 10 mol% and 20 mol% of H2 additions to CH4-air mixture respectively.