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首页> 美国政府科技报告 >HIGH PRESSURE FLAME SYSTEM FOR POLLUTION STUDIES WITH RESULTS FOR METHANE-AIR DIFFUSION FLAMES
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HIGH PRESSURE FLAME SYSTEM FOR POLLUTION STUDIES WITH RESULTS FOR METHANE-AIR DIFFUSION FLAMES

机译：用于甲烷 - 空气扩散火焰的污染研究的高压火焰系统

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A high-pressure flame system has been designed and constructed for studying nitrogen oxide formation in fuel-air combustion. Its advantages and limitations have been demonstrated by tests with a confined laminar methane-air diffusion flame over the pressure range from 1 to 50 atm. The methane issued from a 3.06-mm-diameter port concentrically into a stream of air contained within a 20.5-mm-diameter chimney. As the combustion pressure is increased, the flame changes in shape from wide and convex to slender and concave, and there is a marked increase in the amount of luminous carbon. The height of the flame changes only moderately with pressure.nMeasured values of average nitric oxide formation rate are greater than those predicted by the conventional two-step Zeldovich mechanism with oxygen atoms assumed to be in equilibrium with oxygen molecules. The molar emission index for NOx (the moles of total nitrogen oxides formed per mole of methane consumed) increases rapidly as pressure is increased, reaches a maximum at about 9 atm, and thereafter decreases slowly until at 50 atm it has returned to approximately the same value that it was at 1 atm. This maximum occurs in spite of the fact that the peak temperature in the flame decreases as pressure is increased. Unfortunately, the present data are insufficient to permit a clear choice among several alternatives offered for explaining this maximum.

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