Commercial Aircraft Propulsion and Energy Systems Research Reducing Global Carbon Emissions (2016) / Chapter Skim
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6 Findings, Recommendations, Roles, and Resources
6 Findings, Recommendations, Roles, and Resources
Pages 88-94
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From page 88... ...
Agencies and organizations in government, industry, and academia with an interest in developing propulsion and energy system technologies that could reduce CO2 emissions from global civil aviation and that could be introduced into service during the next 10 to 30 years should execute a national research agenda that places the highest priority on four approaches: • Advances in aircraft–propulsion integration, • Improvements in gas turbine engines, • Development of turboelectric propulsion systems,1 and • Advances in sustainable alternative jet fuels. Finding.
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From page 89... ...
System studies indicate that turboelectric propulsion systems, in concert with distributed propulsion and boundary layer ingestion, have the potential to ultimately reduce fuel burn up to 20 percent or more compared to the current state of the art for large commercial aircraft.2 • Sustainable alternative jet fuels research. Sustainable alternative jet fuels (SAJF)
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From page 90... ...
Low fan pressure ratios are needed to reduce exhaust velocities and thereby improve propulsive efficiency, regardless of whether the fan is driven by a gas turbine or an electrical motor. For a constant level of thrust, this requires that the effective fan area increase so as to avoid commensurate increases in weight, drag, and integration losses.4 • Thermodynamic efficiency.
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From page 91... ...
• SAJF fuel testing, qualification, and certification. It takes longer than it should to commercialize new SAJF production methods, in part because of the cost and time required to complete current fuel qualification and certification processes.
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From page 92... ...
Develop research facilities for megawatt-class electric power and thermal management systems suitable for testing turboelectric aircraft propulsion systems. • Sustainable Alternative Jet Fuels Research -- SAJF industry modeling and analysis.
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From page 93... ...
DOE and its national laboratories would contribute primarily to the development of batteries, fuel cells, gas turbines, and SAJF feedstocks and conversion processes. The primary contributions of the Department of Agriculture and Environmental Protection Agency would be feedstock development and modeling of the SAJF industry, and the Department of Transportation would also make broad contributions to the SAJF research projects.
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From page 94... ...
Currently available resources are making technological advances relevant to turboelectric propulsion and SAJF. Financial requirements, however, will increase substantially as the level of technology readiness increases and the next step requires, for example, flight tests of prototypes of high-power turboelectric systems or the development of full-scale SAJF production facilities.
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