Abstract
Experiment has been carried out to examine the fundamental combustion characteristics of DME fuel-air mixtures using micro-gravity technique, which is achieved in freely falling chamber. The initial conditions of temperature and pressure are 293 K and 0.10 MPa, respectively and the equivalence ratio is the range from stoichiometoric proportion to near the lower flammability limit. The results obtained in the study are as follows:(1) micro-gravity technique is very useful to analyze the flame behavior even at very lean mixtures, and (2) the burning velocity of DME fuel- air mixture is nearly the same with that of methane-air mixture at the range of all the equivalence ratios investigated and those values of DME fuel are 10.0 cm/s and 32.0 cm/s at 0.62 and 0.90 of equivalence ratio, respectively, and (3) from these experimental data it is suggested that the application to the engine combustion of DME fuel is not so impossible.
Highlights
At the present day, the development of new types of fuels such as DME (Di-Methyl Ether, CH3-O-CH3) and waste and bio-mass fuels is strongly required from the viewpoint of energy saving and air pollution prevention on exhaust combustion gases generated from many kinds of combustors
As the first step of the study, experiment has been carried out to elucidate the essential data on combustion of DME fuel-air mixtures such as burning velocity, flammability limits and quenching distance in both conditions of normal and micro-gravity
Micro-gravity environment makes it possible to realize the spherical flame propagation even for near the flammability limits by eliminating buoyant effect induced from gravity and one can obtain the burning velocity with very high accuracy in this environment
Summary
Obecnie ze wzglêdu na koniecznoœæ oszczêdzania energii i zapobiegania zanieczyszczeniu œrodowiska oczekuje siê rozwoju nowych rodzajów paliw jak eter dimetylowy DME (Di-Methyl Ether, CH3-O-CH3) czy paliw uzyskiwanych z przeróbki odpadków i biomasy. W3aœnie o eterze mówi siê jako o paliwie korzystnym z punktu widzenia ograniczenia emisji, tak z silników jak i z kot3ów, a ponadto zachowanie mieszaniny eteru z powietrzem bardzo przypomina zachowanie mieszaniny powietrza z metanem i propanem pomimo jej ma3ej wartoœci opa3owej. Pierwszym krokiem w badaniach by3o przeprowadzenie doœwiadczeñ w celu uzyskania podstawowych danych jak szybkoœæ spalania, granice zapalnoœci oraz odleg3oœæ wygaszenia p3omienia zarówno w warunkach ci1¿enia normalnego jak i mikroci1¿enia. W szczególnoœci, warunki mikoroci1¿enia umo¿liwiaj uzyskanie kulistego rozchodzenia siê p3omienia nawet w pobli¿u granic zapalnoœci przez wyeliminowanie zjawiska wyporu hydrostatycznego wywo3anego ciê¿arem i dziêki temu okreœlenie dok3adnej wartoœci prêdkoœci spalania dla danego oœrodka
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