Noise reduction with lobed mixers: Nozzle-length and free-jet speed effects

3rd AIAA/CEAS Aeroacoustics Conference

Volumn , Issue , 1997, Pages 725-735

  Mengle, Vinod G ^a   Dalton, William N ^a   Bridges, James C ^b   Boyd, Kathy C ^c  

^a ROLLS ROYCE CORPORATION   (United States)

^b NYMA Setar   (United States)

^c NASA GLENN RESEARCH CENTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

AEROACOUSTICS; BYPASS RATIO; MIXERS (MACHINERY); NOISE ABATEMENT; NOZZLES; TURBOFAN ENGINES;

ACOUSTIC DATA; ACOUSTIC TESTS; ENHANCED MIXING; HIGH-FREQUENCY NOISE; LOW-FREQUENCY NOISE; NOZZLE LENGTH; SPEED EFFECT; SUBSONIC JETS;

ACOUSTIC NOISE;

EID: 84977123368     PISSN: None     EISSN: None     Source Type: Conference Proceeding    
DOI: 10.2514/6.1997-1682     Document Type: Conference Paper

References (10)

1. Packman, A. B. and Eiler, D. C. (1977): Internal Mixer Investigation for JT8D Engine Jet Noise Reduction, Vol. I-Results. U. S. Dept. of Transportation, Federal Aviation Administration Report No. FAARD-77-132. 1, Dec. 1977.
2. Shumpert, P. K. (1980): An Experimental Model Investigation of Turbofan Engine Internal Exhaust Gas Mixer Configurations. AIAA-80-0228. AIAA 18th Aerospace Sciences Mtg., Jan. 14-16, 1980.
3. Kuchar, A. (1980): Scale Model Performance Test Investigation of Exhaust System Mixer for an Energy Efficient Propulsion (E3) System. AIAA-80-0229, AIAA 18th Aerospace Sciences Mtg., Jan. 14-16, 1980.
4. Larkin, M. J. and Blatt, J. R. (1984): Energy Efficient Engine Exhaust Mixer Model Technology Report Addendum, Phase III Test Program. NASA CR 174799, April 1984.
5. Saiyed, N. H., Bridges, J. E. and Krejsa, E. A. (1996): Core and Fan Stream’s Mixing Noise Outside the Nozzle for Subsonic Jet Engines with Internal Mixers. AIAA Paper 96-1667, AIAA Aeroacoustics Conf., May 6-8, 1996.
6. Booher, M. E., Kwon, O., Barta, A. B., Vittal B. R. and Krishnan, M. R. (1993): Development of an Advanced Exhaust Mixer for a High Bypass Ratio Turbofan Engine. AIAA 93-2435, AIAA/SAE/ASME/ASEE 29th Joint Propulsion Conference, June 1993.
7. Castner, R. S. (1994): The Nozzle Acoustic Test Rig-An Acoustic and Aerodynamic Free-Jet Facility. NASA TM 106495, 1994.
8. Elliott, J. K., Manning, T. A., Qiu, Y. J., Greitzer, E. M. and Tan, C. S. (1992): Computational and Experimental Studies of Flow in Multi-Lobed Forced Mixers. AIAA Paper 92-3568, 28th Joint Propulsion Conference, July 6-8, 1992.
9. Durbin, P. A. (1983): High-Frequency Green’s Function for Aerodynamic Noise in Moving Media-Part I. General Theory. J. Sound & Vibration, 91(4), 1983, 519-525.
10. Abramovich, G. N. (1963): The Theory of Turbulent Jets. The M. I. T. Press, Cambridge, MA., ch. 5.