NDLI: Shjar jet noise data and power spectral laws

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Shjar jet noise data and power spectral laws

Content Provider	NASA Technical Reports Server (NTRS)
Author	Khavaran Sr., Abbas Bridges Sr., James
Copyright Year	2009
Description	High quality jet noise spectral data measured at the Aeroacoustic Propulsion Laboratory at the NASA Glenn Research Center is used to examine a number of jet noise scaling laws. Configurations considered in the present study consist of convergent and convergent-divergent axisymmetric nozzles. The measured spectral data are shown in narrow band and cover 8193 equally spaced points in a typical Strouhal number range of 0.0 to 10.0. The measured data are reported as lossless (i.e., atmospheric attenuation is added to measurements), and at 24 equally spaced angles (50deg to 165deg) on a 100-diameter (200-in.) arc. Following the work of Viswanathan, velocity power factors are evaluated using a least squares fit on spectral power density as a function of jet temperature and observer angle. The goodness of the fit and the confidence margins for the two regression parameters are studied at each angle, and alternative relationships are proposed to improve the spectral collapse when certain conditions are met. As an immediate application of the velocity power laws, spectral density in shockcontaining jets are decomposed into components attributed to jet mixing noise and shock noise. From this analysis, jet noise prediction tools can be developed with different spectral components derived from different physics.
File Size	12954192
Page Count	63
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20090015382
Archival Resource Key	ark:/13960/t10p61z06
Language	English
Publisher Date	2009-03-01
Access Restriction	Open
Subject Keyword	Acoustics Shock Waves Jet Mixing Flow Jet Aircraft Noise Emission Spectra Scaling Laws Atmospheric Attenuation Aerodynamic Noise Propulsion Spectra Aeroacoustics Noise Prediction Narrowband Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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