Author: James R. Stone
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
Book Description
An Empirical Model for Inverted-velocity-profile Jet Noise Prediction
Author: James R. Stone
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
Book Description
NASA Technical Paper
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 84
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 84
Book Description
NASA Technical Paper
Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 416
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 416
Book Description
NASA Technical Memorandum
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 492
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 492
Book Description
The Aeroacoustics of Supersonic Coaxial Jets
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723430411
Category :
Languages : en
Pages : 184
Book Description
Instability waves have been established as the dominant source of mixing noise radiating into the downstream arc of a supersonic jet when the waves have phase velocities that are supersonic relative to ambient conditions. Recent theories for supersonic jet noise have used the concepts of growing and decaying linear instability waves for predicting radiated noise. This analysis is extended to the prediction of noise radiation from supersonic coaxial jets. Since the analysis requires a known mean flow and the coaxial jet mean flow is not described easily in terms of analytic functions, a numerical prediction is made for its development. The Reynolds averaged, compressible, boundary layer equations are solved using a mixing length turbulence model. Empirical correlations are developed for the effects of velocity and temperature ratios and Mach number. Both normal and inverted velocity profile coaxial jets are considered. Comparisons with measurements for both single and coaxial jets show good agreement. The results from mean flow and stability calculations are used to predict the noise radiation from coaxial jets with different operating conditions. Comparisons are made between different coaxial jets and a single equivalent jet with the same total thrust, mass flow, and exit area. Results indicate that normal velocity profile jets can have noise reductions compared to the single equivalent jet. No noise reductions are found for inverted velocity profile jets operated at the minimum noise condition compared to the single equivalent jet. However, it is inferred that changes in area ratio may provide noise reduction benefits for inverted velocity profile jets. Dahl, Milo D. Glenn Research Center AEROACOUSTICS; COAXIAL FLOW; GAS JETS; JET AIRCRAFT NOISE; NOISE PREDICTION (AIRCRAFT); NOISE REDUCTION; SUPERSONIC JET FLOW; COMPUTATIONAL FLUID DYNAMICS; FLOW STABILITY; MACH NUMBER; MIXING LENGTH FLOW THEORY; TEMPERATURE RATIO; VELOCITY DISTRIBUTION...
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723430411
Category :
Languages : en
Pages : 184
Book Description
Instability waves have been established as the dominant source of mixing noise radiating into the downstream arc of a supersonic jet when the waves have phase velocities that are supersonic relative to ambient conditions. Recent theories for supersonic jet noise have used the concepts of growing and decaying linear instability waves for predicting radiated noise. This analysis is extended to the prediction of noise radiation from supersonic coaxial jets. Since the analysis requires a known mean flow and the coaxial jet mean flow is not described easily in terms of analytic functions, a numerical prediction is made for its development. The Reynolds averaged, compressible, boundary layer equations are solved using a mixing length turbulence model. Empirical correlations are developed for the effects of velocity and temperature ratios and Mach number. Both normal and inverted velocity profile coaxial jets are considered. Comparisons with measurements for both single and coaxial jets show good agreement. The results from mean flow and stability calculations are used to predict the noise radiation from coaxial jets with different operating conditions. Comparisons are made between different coaxial jets and a single equivalent jet with the same total thrust, mass flow, and exit area. Results indicate that normal velocity profile jets can have noise reductions compared to the single equivalent jet. No noise reductions are found for inverted velocity profile jets operated at the minimum noise condition compared to the single equivalent jet. However, it is inferred that changes in area ratio may provide noise reduction benefits for inverted velocity profile jets. Dahl, Milo D. Glenn Research Center AEROACOUSTICS; COAXIAL FLOW; GAS JETS; JET AIRCRAFT NOISE; NOISE PREDICTION (AIRCRAFT); NOISE REDUCTION; SUPERSONIC JET FLOW; COMPUTATIONAL FLUID DYNAMICS; FLOW STABILITY; MACH NUMBER; MIXING LENGTH FLOW THEORY; TEMPERATURE RATIO; VELOCITY DISTRIBUTION...
NASA Reference Publication
Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 1092
Book Description
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 1092
Book Description
Empirical Source Noise Prediction Method with Application to Subsonic Coaxial Jet Mixing Noise
Author: W. E. Zorumski
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 82
Book Description
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 82
Book Description
An Empirical Method for Predicting the Mixing Noise Levels of Subsonic Circular and Coaxial Jets
Author: James W. Russell
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 128
Book Description
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 128
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 440
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 440
Book Description
ICASE/LaRC Workshop on Benchmark Problems in Computational Aeroacoustics (CAA)
Author: Jay C. Hardin
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 412
Book Description
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 412
Book Description