Results of a program to determine the effects of fuel properties on the pollutant emissions of two US Air Force aircraft gas turbine engines are presented. Thirteen test fuels, including baseline JP-4 and JP-8, were evaluated in a cannular (J79) and a full annular (F101) combustor. The principal fuel variables were hydrogen content, aromatic structure, volatility, and distillation end point. Data analysis shows that fuel hydrogen content is a key fuel property, particularly with respect to high power emissions (oxides of nitrogen and smoke), and that low power emissions (carbon monoxide and hydrocarbons) are more dependent on fuel atomization and evaporation characteristics.
study period at any of the other types of stations. Of course, this table does not indicate whether the absolute values of the component indices are increasing or decreasing, but it does identify the problem pollutants towards which special attention should be paid in the formulation of control programs. Three other pollutants, SO2, CO, and O3, surpass their respective standards less frequently than TSP. Only NO2 is generally well under its standard.A result of the study is that there is consistent agreement between EVI and NAQI. A disparity may arise when pollutants frequently exceed their standards. In this case, one would expect EVI to be considerably greater in value than NAQI because it accumulates excess values rather than taking only the maximum value in excess of the standard. Additionally, NAQI could also be greater than EVI because it includes an additional annual term. It also has an additional subindex for NO2, but the effects of this pollutant are probably negligible in this case.
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