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2212 Y.Anda et al./Energy 90(2005)2206;2218 <br /> 1 --a-•Re-0 <br /> —*—Re-dM <br /> 0.8 -1-1tsr10000 <br /> 0.6 <br /> 1 <br /> -�z 0.4 1 <br /> 0.2 <br /> 0 <br /> 0.2 0.6 1 1.4 1.8 2.2 <br /> Air Stews Ratio <br /> S.MW Apparent Same propagation limits of hornogaeoas gams of aDhen*-sir—dtrogpt MUtnm[l].`Re..Reynolds <br /> number. <br /> the other hand,in case of substances such as C2H6 and C3Hs,whose dMsivities are smaller than 02 <br /> peals shift is in the opposite direction, ' <br /> Fig.8[1]shows the flammable limits as a function of the Reynolds number,Re.As can be seen from <br /> this flgure,at any given stream velocity,the flammable mixture range becomes narrower rapidly as the <br /> concentration of N2 increases in the methane--nitrogen fuel mixture.For sufficiently fast w1rams,flame <br /> propagation cannot be achieved event in the stoichiometric mixtures since the We of dissipation of the <br /> energy released from the flame is too fast to provide adequate time for the chemical energy to be released <br /> and for further propagation of the reaction. Additionally, blowouts, due to flame stretching, occur <br /> frequently as Reynolds number increases or combustion speed decreases. Therefore, the flammable <br /> mixture range becomes narrower as Reynolds.number increases, and the effect of selective diffusion <br /> make the flammable range shift to the lean side.Eventually the stable operating range lies on lean side <br /> and becomes narrower as angme speed increases for engine operation with Gas 2 (methane rich low- <br /> BTU gas). <br /> —metiune <br /> --brdroom <br /> 0.2 OA 0.6 0.8 1 1.2 IA l.6 1.8 2 2.2 <br /> Air Excess mno <br /> Fig.9.Quenching distance[2]. <br /> V <br />