Experimental Investigation of Effects of The Ratio of Swirler Hub Diameter to Outer Diameter (Dh/Do) on Synthetic Gas Flames: Part 2: Dynamic Flame Behaviour at Externally Altered Acoustic Conditions

YILMAZ H., ÇAM Ö., YILMAZ İ.

The 16th International Conference of Young Scientists on Energy Issues (CYSENI 2019), Kaunas, Lithuania, 23 - 24 May 2019, pp.329, (Summary Text)

  • Publication Type: Conference Paper / Summary Text
  • City: Kaunas
  • Country: Lithuania
  • Page Numbers: pp.329
  • Erzincan Binali Yildirim University Affiliated: Yes

Abstract

In a combustion device, unsteady heat release causes acoustic energy to increase when acoustic damping (energy loss) is not that effective, and as a result, thermos-acoustic flame instabilities occur. In this study, effects of swirler dh/do ratio (at different swirl numbers) on dynamic flame behaviour of premixed 20%CNG 30%H2 30%CO 20%CO2 mixture under externally altered acoustic boundary conditions and stability limits (flashback and blowout equivalence ratios) of such mixture were investigated in a laboratory scale, variable geometric swirl number combustor. Therefore, swirl generators with different dh/do ratio (0.3 and 0.5) and geometric swirl number (0.4, 0.6, 0.8, 1.0 1.2 and 1.4) were designed and manufactured. Acoustic boundary conditions in the combustion chamber were altered using loudspeakers, and flame response to these conditions was perceived using photodiodes and pressure sensors. Dynamic flame behaviour of respective mixture was evaluated using luminous intensity and pressure profiles. Results showed that dh/do ratio has a minor impact on dynamic flame behaviour.