CORE ENGINE NOISE PROGRAM. VOLUME III. PREDICTION METHODS -- SUPPLEMENT I. - EXTENSION OF PREDICTION METHODS

The core noise prediction technique described in Volume III was validated using several additional sets of engine data. The data included discernible core noise at high power settings and were derived from both General Electric and external tests, on engines by GE and other manufacturers. The three line power level prediction method was collapsed to single unified line prediction through addition of a turbine work extraction term to account for the low frequency noise attenuation due to turbine blading. Data from combustor component tests were compared to engine noise levels and found to indicate significant attenuation of low frequency noise in propagation through turbine stages. An analytical method for predicting this low frequency noise attenuation is provided. (Author)

• Supplemental Notes:
  • Supplement to report dated Aug 74, Rept. no. FAA-RD-74-125-3, Volume 3, AD-A013 131.
• Corporate Authors:

  General Electric

  Marine Turbine & Gear Engineer, 1100 Western Ave
  Lynn, MA  United States  01910
• Authors:
  • Emmerling, J J
  • Kazin, S B
  • Matta, R K
• Publication Date: 1976-3

Media Info

• Pagination: 51 p.

Subject/Index Terms

• TRT Terms: Acoustic measuring instruments; Acoustics; Aircraft noise; Civil aircraft; Engine components; Jet engines; Low frequency; Noise; Noise control; Noise sources; Turbofan engines
• Uncontrolled Terms: Attenuation; Noise reduction
• Old TRIS Terms: Acoustic measurement; Jet engine noise
• Subject Areas: Aviation; Environment; Vehicles and Equipment;

Filing Info

• Accession Number: 00146053
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FAA-RD-74-125-3-1 Final Rpt., R76AEG305-V3-Supl
• Contract Numbers: DOT-FA72WA-3023
• Files: NTIS, TRIS
• Created Date: Jan 16 1977 12:00AM