Journal of the Korean Society of Combustion (한국연소학회지)
- Volume 13 Issue 4
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- Pages.26-36
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- 2008
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- 1226-0959(pISSN)
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- 2466-2089(eISSN)
Effects of Burner Distance on Flame Characteristics at Low Strain Rate Counterflow Edge Flames
저 신장율 대향류 확산화염에서 화염 특성에 관한 버너 간격 효과
Abstract
Experimental study is conducted to identify the existence of a shrinking flame disk and to clarify its flame characteristics through the inspection of critical mole fraction at flame extinction and edge flame oscillation at low strain rate flames. Experiments are made as varying global strain rate, velocity ratio, and burner distance. The transition from a shrinking flame disk to a flame hole is verified through gradient measurements of maximum flame temperature. The evidence of edge flame oscillation in flame disk is also provided through numerical simulation in microgravity. It is found at low strain rate flame disks in normal gravity that buoyancy effects are importantly contributing to lateral heat loss to burner rim, and is proven through critical mole fraction at flame extinction, edge flame oscillation, and measurements of flame temperature gradient along flame disk surface.
Keywords
- Burner Distance;
- Critical Mole Fraction at Extinction;
- Edge Flame Oscillation;
- Flame Disk;
- Flame Hole;
- Global Strain Rate;
- Lateral Heat Loss;
- Velocity Ratio