난류 예혼합 화염 선단부의 통계적 특성에 관한 수치적 연구
Leading Edge Statistics of a Turbulent Premixed Flame
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초록
Leading edge statistics are obtained by direct numerical simulation (DNS) of freely propagating incompressible and stagnating compressible turbulent premixed flames. Conditional averages of velocities in terms of reaction progress variable, , and local flame surface density, , are defined and compared through the flame brush. It holds asymptotically that and with the characteristic length scale of variation, . It also holds that for a freely propagating flame under no mean strain rate. The turbulent burning velocity, ST, is determined by the conditional statistics at the leading edge under large activation energy.
Abstract
Leading edge statistics are obtained by direct numerical simulation (DNS) of freely propagating incompressible and stagnating compressible turbulent premixed flames. Conditional averages of velocities in terms of reaction progress variable, , and local flame surface density, , are defined and compared through the flame brush. It holds asymptotically that and with the characteristic length scale of variation, . It also holds that for a freely propagating flame under no mean strain rate. The turbulent burning velocity, ST, is determined by the conditional statistics at the leading edge under large activation energy.
참고문헌 (10)
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