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Y.Ando or at/Energy 30(2W5)22o -njS 2215 <br /> ♦--clog 1 Ne;2a00min•t <br /> 20 —002 Xe;Mftin-1 <br /> $-nan+rslgss Na,2a00m1o•1 <br /> _ 15 <br /> 10 <br /> 3 <br /> 4 <br /> 0.3 1 1.5 2 <br /> AirExcessRatio <br /> Pig 13.Mets of air excess ratio on No,,anission. <br /> In the case of dual-fueled engine, because of compression ignition, ignition timing cannot be <br /> advanced much earlier. But ignition becomes multipoint ignition, so we can expect improvements of <br /> combustion. <br /> Fig. 12 shows normalized cumulative heat release profiles for the stoichiometric,fuel-rich,and fuel- <br /> lean mixtures of each heel gas,respectively.Because of the differences in flammable rich limit,values of <br /> air excess ratio are different. <br /> At fuel-lean conditions,excellent combustion of Gas 1 can be achieved.For the combustion of Gas 2, <br /> the beat release profiles are similar to those obtained from natural gas combustion, the latter being <br /> midway between the results of Gas i and Gas 2.Also,for On 2,we do not observe the persistent dull <br /> combustion that is characteristic of the combustion of the other two fuels. <br /> At fuel-rich combustion,Gas 2 combustion is similar to that of natural gas.Ignition delay becomes <br /> longer and combustion speed becomes slower than those at stoichiometric condition.But in the case of <br /> Gas 1,ignition delay remains unchanged. <br /> --;-(las l Ne;2800mia' <br /> 1100 ,t-0"2 Ne;2000min'� <br /> -•-$—natural gas Ne;28M in � <br /> low <br /> 1100 <br /> OL <br /> 1�r <br /> 800 or <br /> 600 <br /> 300 <br /> 0s 1 1.5 2 <br /> Air Excess Redo <br /> Pig. 14.Effects of air excess ratio on exhaust temperature. <br /> N <br /> .r <br /> F> <br />