1 lecture 8: environmental emissions eric loth for ae 440 a/c lecture sept 2009
TRANSCRIPT
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Lecture 8: Environmental Emissions
Eric Loth
For AE 440 A/C LectureSept 2009
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Some Emissions Responsibilities
a. Identify emission sources (acoustical, chemical and particulate) for flight & operations
b. Develop concepts to reduce emissions
c. Develop quantitative analysis for sources
d. Develop schemes to quantitatively minimize emissions (AE 441)
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Acoustic Emissions
Reference: Aeroacoustics of Flight Vehicles, Vol. 1 and 2, 1995, H.H. Hubbard (on reserve)
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Turbo-Fan and Airframe Noise
2 6
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sin V SOASPL in dB 10log 28.0
r AR
2 6
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sin V SOASPL in dB 10log 28.0
r AR
t inlet
Peak OASPL in dB
T40log 20log U 10log A 164
T
2 6wing
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OASPL in dB
V Ssin10log 28.0
r AR
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Suggestions for Noise Emissionsfor CDR
• Review FAA Limits and determine Team Design noise constraints
• Examine noise levels of various engines (impacts Propulsion choice)
• Examine noise levels of various airframes
(impacts Aerodynamics choice)• Consider noise mitigation strategies• Investigate techniques to quantify noise levels
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Particulate Flux by Engine
http://www.trbav030.org/pdf/TRB05Ann_685_j_pehrson.pdf
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Suggestions for Chemical and Particulate Emissions
• Review FAA Limits and determine Team design emission constraints
• Examine emissions of various fuels and engines (impacts Propulsion choice)
• Consider mitigation strategies for soot and chemical species
• Investigate techniques to quantify chemical and particulate emissions