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

• Autorzy: Gutkowski Artur N. , Cebulski Zbigniew

Identyfikatory

DOI

10.2478/mme-2021-0005

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

premixed flame; small tubes; flame propagation speed; flame shape

PL

płomień kinetyczny; małe rurki; prędkość propagacji płomienia; kształt płomienia

• Wydawca: Wydawnictwo Politechniki Łódzkiej
• Czasopismo: Mechanics and Mechanical Engineering
• Rocznik: 2021
• Tom: Vol. 25, nr 1
• Strony: 32--38
• Opis fizyczny: Bibliogr. 21 poz., il. kolor., rys., wykr.

Twórcy

autor

Gutkowski Artur N.

• Lodz University of Technology, Institute of Turbomachinery, Łódź, Poland

autor

Cebulski Zbigniew

• Lodz University of Technology, Institute of Turbomachinery, Łódź, Poland

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).