20030067980 · Efficient, Low-Cost Fan System Research for General Aviation and Commuter Aircraft

NASA · 2003

Open the PDFPublic domain · NASATechnical Reports

Overview

This document reports research investigations into efficient, low-cost fan system concepts for high bypass turbofans for future general aviation and commuter aircraft. The research specifically addressed lower pressure ratio fans for good propulsive efficiencies in the 200 to 400 knot flight speed…

Pages: 80
Chapters: 69

Key points

The research focuses on efficient, low-cost fan system concepts for high bypass turbofans intended for general aviation and commuter aircraft.
Aerodynamic design analyses predicted fan efficiency in the range of 91 to 92 percent (adiabatic).
The study identified an aluminum blisk rotor and investment cast stator as the lowest cost manufacturing option.
The fan design demonstrated excellent vibratory characteristics and the ability to withstand one- and four-pound bird strikes.
Estimated community noise levels for the low-speed, low-pressure fans are 24 to 30 EPNdB lower than those of larger, high pressure ratio transonic fans.

Frequently asked questions

What is the main focus of this research?

The research investigates efficient, low-cost fan system concepts for high bypass turbofans for general aviation and commuter aircraft.

What efficiency levels were predicted for the fan systems?

Aerodynamic design analyses yielded predicted efficiency levels in the area of 91 to 92 percent (adiabatic).

What materials were identified as the lowest cost for manufacturing?

The study identified an aluminum blisk rotor and investment cast stator as the lowest cost manufacturing option.

How does the fan design perform in terms of bird strike resistance?

The fan design has excellent vibratory characteristics and is capable of passing one- and four-pound bird strikes satisfactorily.

What are the expected community noise levels for the fans studied?

The low-speed and low-pressure fans are estimated to have community noise levels that are 24 to 30 EPNdB lower than those of larger, high pressure ratio transonic fans.

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69 NASA/CR—2003-212476 Form Approved REPORT DOCUMENTATION PAGE OMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503.

2. REPORT DATE 3. REPORT TYPE AND DATES COVERED 1. AGENCY USE ONLY ( Leave blank) Final Contractor Report August 2003 4. TITLE AND SUBTITLE 5. FUNDING NUMBERS Efficient, Low-Cost Fan System Research for General Aviation and Commuter Aircraft WU–505–65–10–00 6. AUTHOR(S) NAS3–27644 G.L. Merrill 8. PERFORMING ORGANIZATION 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) REPORT NUMBER Advanced Propulsion, Inc.

E–14014 2849 South 44th Street Phoenix, Arizona 85040 10. SPONSORING/MONITORING 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) AGENCY REPORT NUMBER National Aeronautics and Space Administration Washington, DC 20546– 0001 NASA CR—2003-212476 11. SUPPLEMENTARY NOTES This research was originally published internally as AST020 in December 1997. This report is a formal draft or working paper. Project Manager, Joseph D. Eisenberg (retired). Responsible person, Susan M. Johnson, organiza- tion code 2200, 216–433–2163.

12b. DISTRIBUTION CODE 12a. DISTRIBUTION/AVAILABILITY STATEMENT Unclassified - Unlimited Subject Category: 07 Distribution: Nonstandard Available electronically at http://gltrs.grc.nasa.gov This publication is available from the NASA Center for AeroSpace Information, 301–621–0390.

13. ABSTRACT (Maximum 200 words) This document reports research investigations into efficient, low-cost fan system concepts for high bypass turbofans for future general aviation and commuter aircraft. The research specifically addressed lower pressure ratio fans for good propulsive efficiencies in the 200 to 400 knot flight speed regime. Aerodynamic design analyses yielded pre- dicted efficiency in area of 91 to 92 percent (adiabatic). Low-cost manufacturing studies yielded an aluminum blisk rotor and investment cast stator having lowest cost. Structural design analyses yielded a design having excellent vibratory characteristics and the ability to pass One- and Four-pound bird strikes satisfactorily. The low speed and low pressure fans of the study are estimated to have 24 to 30 EPNdB lower community noise levels than larger, high pressure ratio transonic fans.

14. SUBJECT TERMS 15. NUMBER OF PAGES Turbofan; Fan system; General aviation; Commuter aircraft 16. PRICE CODE 19. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION 17. SECURITY CLASSIFICATION 20. LIMITATION OF ABSTRACT OF ABSTRACT OF THIS PAGE OF REPORT Unclassified Unclassified Unclassified NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std. Z39-18 298-102