ACRP-Problem-No-12-02-12.pdf
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1、ACRP Problem No. 12-02-12 Improved Take-Off Thrust Setting Estimates for Airport Emissions Inventories ACRP Staff Comments: The proposed research would build on and would need to consider ACRP Project 02-03A, Measurement of Gaseous HAP Emissions from Idling Aircraft as a Function of Engine and Ambie
2、nt Conditions; ACRP Report 9, Summarizing and Interpreting Aircraft Gaseous and Particulate Emissions Data; ACRP Report 11 and Web-Only Document 2, Guidebook on Preparing Airport Greenhouse Gas (GHG) Emissions Inventories; ACRP Project 02-08, Quantifying Contributions to Local Air Quality Impacts fr
3、om Airport-Related Emissions; and ACRP Project 02-12, Environmental Optimization of Aircraft Departures: Fuel Burn, Emissions, and Noise. TRB Aviation Group Committees Comments: AIRCRAFT/AIRPORT COMPATIBILITY CMTE - The ultimate deliverable is not well defined, and that is key to the research having
4、 value. The resulting model should be able to predict thrust settings and the emission levels that result. ENVIRONMENTAL IMPACTS OF AVIATION CMTE - Support. This problem statement is essentially identical to Problem Statement 12-02-09, Modeling Reduced Thrust Takeoffs in Standard Environmental Tools
5、, except that it focuses on emissions rather than noise. Actually, its not so much a noise or emissions issues but rather one of aircraft performance and operations. Both of these proposed projects will help fill a gap in the Integrated Noise Model (INM)/Emissions Dispersion Modeling System (EDMS) a
6、nd the Aviation Environmental Design Tool (AEDT) that have persisted for a long time. Although the funding level for this project is $450,000, it can be combined with 12-02-09 for a total of $400,000. Review Panel Comments: Recommended Consider combining this with ACRP Problem Statement 12-02-09, wi
7、th 12-02-12 serving as the primary problem statement. Should have a combined emphasis on noise and air quality. Some work has been done, but questions remain on the compatibility between modeling results and actual data. Other research in this area of inquiry is not completely verified against field
8、 data. If additional data is required, budget should be increased to cover both air quality and noise. AOC Disposition: Approved and funded at $450,000. Some questioned whether this was beyond the purview of ACRP and more appropriately handled by the FAA; however, their research funding has been red
9、uced. This effort should be combined with Problem Statement 12- 02-09, Modeling Reduced Thrust Takeoffs in Standard Environmental Tools. The AOC cautioned the research panel to make sure the information needed to undertake the study is available and readily obtained; otherwise, the project should no
10、t be undertaken. PROPOSED RESEARCH PROBLEM STATEMENT FOR AIRPORT COOPERATIVE RESEARCH PROGRAM FY 2012 A AC CR RP P Problem NumberProblem Number: 12-02-12 I. PROBLEM TITLE Improved Take-Off Thrust Setting Estimates for Airport Emissions Inventories II. RESEARCH PROBLEM STATEMENT The take-off roll con
11、tributes a large fraction (typically 40%) of ground-level NOx emissions from aircraft. Although the duration of the roll is relatively short, the emission rate is high because both emission index (g NOx per kg fuel) and fuel flow (kg/s) increase with thrust for most aircraft types, so that NOx emiss
12、ion rate is roughly proportional to the square of thrust. This also means that the emission rate is very sensitive to the thrust used. Although NOx emissions are particularly sensitive to thrust, fuel use (and therefore CO2 and other emissions) are also thrust-dependent (approximately proportional).
13、 Emissions of PM are somewhat dependent on thrust, but slightly less sensitive than fuel. At many airports, aircraft routinely use less than full thrust when taking off, primarily to reduce wear on the engines and increase the life of the high temperature components. The extent of this thrust reduct
14、ion is limited by operational regulations, but may be as much as a 25% reduction from full thrust (and may be greater if engine derate is used as well). However, the actual thrust settings used on take-off are not readily available to compilers of inventories, leading to uncertainty in the results o
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- ACRP Problem No 12 02
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