J.L. Bettner and S. StrattonAllison Engine Company, Indianapolis, Indiana

Unique Systems Analysis Task 7, AdvancedSubsonic Technologies Evaluation Analysis

NASA/CR—2004-212468

September 2004

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J.L. Bettner and S. StrattonAllison Engine Company, Indianapolis, Indiana

Unique Systems Analysis Task 7, AdvancedSubsonic Technologies Evaluation Analysis

NASA/CR—2004-212468

September 2004

National Aeronautics andSpace Administration

Glenn Research Center

Prepared under Contract NAS3–25459, Task Order 7

Document History

This research was originally published internally as AST004 in December 1996.

Available from

NASA Center for Aerospace Information7121 Standard DriveHanover, MD 21076

National Technical Information Service5285 Port Royal RoadSpringfield, VA 22100

Trade names or manufacturers’ names are used in this report foridentification only. This usage does not constitute an officialendorsement, either expressed or implied, by the National

Aeronautics and Space Administration.

This report contains preliminaryfindings, subject to revision as

analysis proceeds.

Available electronically at http://gltrs.grc.nasa.gov

Note that at the time of research, the NASA Lewis Research Centerwas undergoing a name change to the

NASA John H. Glenn Research Center at Lewis Field.Both names may appear in this report.

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NASA CR—2004-212468

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WU–538–06–11–00NAS3–25459, Task Order 7

32

Unique Systems Analysis Task 7, Advanced Subsonic TechnologiesEvaluation Analysis

J.L. Bettner and S. Stratton

Propulsion; Turbine engines; Subsonic transports

Unclassified -UnlimitedSubject Category: 07 Distribution: Nonstandard

Allison Engine CompanyP.O. Box 420Indianapolis, Indiana 46206–0420

This research was originally published internally as AST004 in December 1996. Project Manager, Joseph D. Eisenberg(retired). Responsible person, Susan M. Johnson, organization code 2200, 216–433–2163.

To retain a preeminent U.S. position in the aircraft industry, aircraft passenger mile costs must be reduced while at thesame time, meeting anticipated more stringent environmental regulations. A significant portion of these improvementswill come from the propulsion system. A technology evaluation and system analysis was accomplished under this task,including areas such as aerodynamics and materials and improved methods for obtaining low noise and emissions.Previous subsonic evaluation analyses have identified key technologies in selected components for propulsion systemsfor year 2015 and beyond. Based on the current economic and competitive environment, it is clear that studies withnearer turn focus that have a direct impact on the propulsion industry’s next generation product are required. This studywill emphasize the year 2005 entry into service time period. The objective of this study was to determine which technolo-gies and materials offer the greatest opportunities for improving propulsion systems. The goals are twofold. The first goalis to determine an acceptable compromise between the thermodynamic operating conditions for A) best performance, andB) acceptable noise and chemical emissions. The second goal is the evaluation of performance, weight and cost ofadvanced materials and concepts on the direct operating cost of an advanced regional transport of comparable technologylevel.