A Correlation of Mixing Noise from Coannular Jets with Inverted Flow Profiles PDF Download
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Author: S. Paul Pao
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 132
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Book Description
Author: S. Paul Pao
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 132
Get Book Here
Book Description
Author: S. Paul Pao
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 132
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Book Description
Data are correlated for jet mixing noise from coannular jets with inverted flow velocity profiles. The acoustic performance of coannular jets is compared to the performance of a hypothetical single jet with the same total mass flow, thrust, and total enthalpy flow as the coannular jet. The study shows that coannular jets with velocity ratios greater than 1.2 produce less noise than their corresponding equivalent tests and that optimum noise reduction of coannular jets in the data set occurs within a range of equivalent velocities between 500 and 700 meters per second and velocity ratios between 1.6 and 2.3. The maximum sound power reduction is found to be about 4 decibels. Directivity indices and a special set of spectral curves were developed to describe the characteristic double peak spectra of coannular jet noise. The temperature ratio between the inner and outer streams was not found to be important in this acoustic correlation. However, the mean temperature effect was included in the computations of sound pressure levels.
Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 604
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Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 582
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 442
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 798
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 964
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Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 1092
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Book Description
Author: J. W. Russell
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 164
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Book Description
A coannular jet was equated with a single stream equivalent jet with the same mass flow, energy, and thrust. The acoustic characteristics of the coannular jet were then related to the acoustic characteristics of the single jet. Forward flight effects were included by incorporating a forward exponent, a Doppler amplification factor, and a Strouhal frequency shift. Model test data, including 48 static cases and 22 wind tunnel cases, were used to evaluate the prediction method. For the static cases and the low forward velocity wind tunnel cases, the spectral mean square pressure correlation coefficients were generally greater than 90 percent, and the spectral sound pressure level standard deviation were generally less than 3 decibels. The correlation coefficient and the standard deviation were not affected by changes in equivalent jet velocity. Limitations of the prediction method are also presented.
Author: J. W. Russel
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 164
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Book Description
