Landmark Number

Surname

Landmark Number

{\ displaystyle {\ mathit {Ma}}}

dimension

dimensionless

definition

{\ displaystyle {\ mathit {Ma}} = {\ frac {\ mathcal {L}} {\ delta _ {f}}}}

${\ displaystyle {\ mathcal {L}}}$	Marckstein length
${\ displaystyle \ delta _ {f}}$	characteristic flame thickness

Named after

George Marckstein

scope of application

Combustion theory

The mark stone number is the ratio of the mark stone length to the thickness of the flat, unstretched premixed flame. It characterizes the influence of the flame curvature on the burning rate and depends on the fuel, mixture composition, preheating temperature and thermodynamic pressure. The longer the marker length, the greater the influence of the flame curvature on the local burning rate.

The index is named after the fluid mechanic George Markstein (1911–2011), who was able to show that thermal diffusion stabilizes curved flame fronts and thus establishes a relationship between the critical wavelength for the stability of a flame front (Markstein length) and the thermal width of the flame Has.

literature

SG Davisa, J. Quinarda, G. Searby: Determination of Markstein numbers in counterflow premixed flames , in: Combustion and Flame , 130 (1-2), 112-122, doi: 10.1016 / S0010-2180 (02) 00369-3
Gabriel D. Roy: Combustion processes in propulsion: control, noise, and pulse detonation . Butterworth-Heinemann, 2006, ISBN 978-0-12-369394-5

Web links

N. Peters: Final report on the research project Pe 241 / 9-2 "Turbulent burning rate" , page 9 (PDF; 617 kB)
Glossary on Explosion Dynamics

Individual evidence

↑ Torsten Voigt: Numerical simulation of vortex dynamic instability behavior of turbulent premixed flames . KIT Scientific Publishing, 2015, ISBN 3-7315-0266-6 , pp. 61 ( limited preview in Google Book search).
↑ Oran ES: A tribute to Dr. George H. Markstein (1911-2011) . In: Combustion and Flame . 162, No. 1, 2015, pp. 1-2. doi : 10.1016 / j.combustflame.2014.07.005 .

[1] Torsten Voigt: Numerical simulation of vortex dynamic instability behavior of turbulent premixed flames . KIT Scientific Publishing, 2015, ISBN 3-7315-0266-6 , pp. 61 ( limited preview in Google Book search).

[2] Oran ES: A tribute to Dr. George H. Markstein (1911-2011) . In: Combustion and Flame . 162, No. 1, 2015, pp. 1-2. doi : 10.1016 / j.combustflame.2014.07.005 .