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자료유형
연구보고서
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한국자동차공학회 한국자동차공학회 기타 간행물 한국자동차공학회 기타간행물(Proceedings of UK)
발행연도
1998.11
수록면
1 - 9 (9page)

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Laminar burning veloctities should be quated for stretch-free conditions and the effect of stretch on the burning velocity, given by appropriate Markstein numbers. The procedures for doing this are outlined. Flames are inherently unstable, but may be partially stabilised by thermo-diffusive effects at high Markstein numbers. At low markstein numbers thermo-diffusion can enhance the underlying hydrodynamic instability. Flame instabilities increase as the radius of a propagating flame and the pressure increase. The increases wrinkling of the flame associated with the instability results in an ever increasing flame speed as the flame propagates in uncomfined explosions. These effects can also be important in engine combustion. There are diffculties in defining the laminar burning velocity once the flame becoms unstable. Should the quoted laminar burning velocity include the effects of instability? There is increasing evidence that, to a good approximation, a turbulent flame of be regarded as an array of stretched laminar flames, but the consequences of any flamelet instability are not fully understood. Correlations of turbulent burning velocity are discussed and also the importance of the Karlovitz stretch factor, particularly in the context of reaction quenching and mixing.

목차

Abstract

1.Measurement of laminar burning velocity, flame stretch rates and Markstein lengths

2.Flame instabilities and cellularity

3.Theoretical explosion flame stability limits and flame speeds

4.Turbulent burning velocity

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