Measurement of Gaseous HAP Emissions from Idling Aircraft as a Function of Engine and Ambient Conditions (2012) / Chapter Skim
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Pages 71-76
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From page 71... ...
Thus significant emphasis has been placed on a well defined "near-idle" test matrix for the measurements described in this work. This section will examine emission index and fuel flow trends in the ICAO databank and perform a comparison with the data collected here.
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From page 72... ...
The cockpit controls were used to enable the cabin climate control system. In order to investigate the no-bleed air engine state two different scenarios were employed.
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within each category in order to better depict points which are very close in fuel flow. Fan Speed, Exhaust Gas Temperature, and the Relationship with Fuel Flow In addition to fuel flow rate, two other engine characteristics, N1 and exhaust gas temperature (EGT)
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From page 74... ...
The overall CO2 mixing ratio by volume at the engine exhaust plane is greater for the high bleed air demand condition than when N1 = 25%. Despite the complexity of accounting for bleed air demand in the engine conditions (between the lowest fuel flow rate -- minimum engine idle, no bleed -- and the greatest fuel flow rate -- 7% thrust or N1 = 25%)
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From page 75... ...
The triangles, squares and circles denote different aircraft tests. The dark blue points reflect lower N1 rotational speeds for two of the starts than the lighter blue points.
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From page 76... ...
Washington, DC: Transportation Research Board. Yelvington, P
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