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Y.Ando et aL/Emrgy 30(20015)22o&2218 2211 <br /> --B <br /> 100 so m:2800MIR41 <br /> 90 <br /> to / <br /> I <br /> 70 <br /> 60 <br /> 40 <br /> 0.5 1 1.5 2 <br /> Air Excess Ratio <br /> Fig.0.13$ecta of air excess ratio on bmke combustion effid my.-Nr••eagine speed. <br /> 3.2. Combustion test results <br /> 3.2.1. Combustion characlerodcs elf, methane with diluents <br /> For the methane-rich low-BTU gas (Gas 2), only 50% of the overall heating value is attributed to <br /> methane gas.Therefore,the combustion characteristics of this fuel gas depend greatly on the combustion <br /> of diluted methane.Thetnfore basic combustion characteristics of methane are shown in Figs.7-9.Fig.7 <br /> f 1]shows the turbulent flame speed as a function of air excess ratio at various dilution rates.Decrease of <br /> combustion temperature by diluents causes a lowering of the combustion speed.It can also be on that <br /> peaks of flame speed shift slightly from rich side to lean side of the AN ratio.This behaviour is due to <br /> selective diffusion.Effect of selective.diffusion depends on diffusivity of the substance And incase of <br /> substances such as CH4 and H3,whose diff Wvities are larger than Oz,peak shift is from rich to lean.On <br /> 1.1 <br /> 1 �--cF1 l00% <br /> Lt <br /> 70% <br /> 0.9FL 50% <br /> 04 FL 34% <br /> 0.7 <br /> 0.6 <br /> 0.5 <br /> 0.4 <br /> 0.3 <br /> 0.2 0.6 1 1.4 1.6 2.2 <br /> Air Excess Rador <br /> Fiw,7.Typical voiationa of the apparent flame speed with air excess ratio in homogeneous streaming ,ixwm(Reynolds <br /> nnmber-2000)of methene-carfipu dioxide in air j1l. <br />