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Analysis of flame propagation in small adiabatic tubes characterized by different degrees of the end opening

Gutkowski Artur N., Cebulski Zbigniew

Mechanics and Mechanical Engineering

2021

Vol. 25, nr 1

32--38

In the present work, we study numerically freely propagating flame in the stoichiometric propane-air mixture. The adiabatic small tubes with one end fully open and the second one characterized by different degrees of opening are examined. The degree of opening of the tubes was equal to: 0% (completely closed), 25%, 50%, 75% and 100% (fully opened) of the tube cross-sectional area. Several mechanisms, such as thermal expansion of the burned gas that can leave the tube freely (fully opened left end of the tube), frictional forces and movement of the unburned mixture generated by a pressure gradient, occur simultaneously during flame propagation. As a result, a nearlyexponential dependence of flame propagation speed as a function of time is observed. For fully open right end (100%), normalized flame speed reaches about 75-80 at the end of the tubes. By partially closing the right end, this effect is delayed and reduced - for 25% of the opening normalized flame speed is about 20 for all tube diameters.

Optyczne badania rozkładu prędkości w płomieniu kinetycznym podczas spalania lpg i cng

Czajka J., Pielecha I., Wisłocki K.

Logistyka

2008

nr 6

CD-CD

W pracy przedstawiono badania rozkładu prędkości w płomieniu kinetycznym dla dwóch alternatywnych paliw gazowych cng i lpg. obserwacje przeprowadzono dla tzw. płomieni kinetycznych powstających przy zastosowaniu palnika bunsena. w badaniach wykorzystano optyczne metody pomiarowe oraz cyfrową obróbkę materiału zdjęciowego z wykorzystaniem programu davis.

In the abstract the research on speed distribution in kinetic flame for two alternative gas fuels (cng and lpg) has been presented. the observation has been conducted for so called kinetic flames, which emerged by the use of bunsen burner. in the research both optical measure methods and digital processing of the photographic material, by means of the davis program, have been used.