Algorithm for the Nonlinear Propagation of Broadband Jet Noise

Toward Active Control of Noise from Hot Supersonic Jets

“…Approved for Public Release -Distribution is Unlimited propagation effects through the standard atmosphere are not scalable (these discrepancies have also been observed by Gallagher (1982), Petitjean et al (2006), McLaughlin et al (2010) and Saxena et al (2009)). As an example, a successful capture of cumulative non-linear waveforms produced by a full-scale engine by Gee et al (2008) comprised observer distances of 300 m (410 D,); most laboratory-scale studies are restricted by chamber walls that extend only a few meters from the source region.…”

“…Aside from conventional spectral analysis, Laufer et al (1976), Gallagher (1982), Petitjean et al (2006) and Veitin et al (2011) studied the temporal characteristics of the acoustic pressure waveform in a laboratory (rangerestricted) environment while Gee et al (2008) focused on the nonlinear propagation effects of a full-scale static jet engine and compared the experimental data successfully to a numerical model based on the generalized Burgers equation. Some of the more relevant numerical studies include the large-eddy simulation of an overexpanded Mach 3.3 jet by de Cacqueray et al (20116) as well as the frequency-domain algorithm for simulating nonlinear noise propagation by Saxena et al (2009). Where the development of robust acoustic analogies are concerned, one may wish to review the work of Morris & Farassat (2002), Tarn et al (2008), Tam (2009) and .…”

“…However, only weak observations of cumulative nonlinear effects have been made using a laboratory-scale setup, all the while being observed under full-scale conditions. Examples of full-scale jet and rocket tests can be found in the literature (Morfey & Howell 1981;Mclnerny 1996;Mclnerny & Olgmen 2005;Gee et al 2008;Saxena et al 2009). In particular, significant nonlinear effects from full-scale engine tests were found in the spectra presented by Morfey & Howell (1981) and Gee et al (2008).…”

Prediction of nonlinear propagation of noise from a solid rocket motor

“…Additional arbitrary waveform modeling developments took place in the context of nonlinear sonic boom propagation, [15][16][17] but much of the recent interest has been the noise propagation from modern high-performance tactical aircraft. Nonlinear F/A-18E noise propagation was calculated by Gee et al, 18 Brouwer, 19 and Saxena et al 20 using different GBE-based algorithms. A more comprehensive treatment of the noise radiated by the F-22A Raptor was carried out by Gee et al 4,5 and algorithm refinements were incorporated in a study of the noise propagation from the F-35AA Joint Strike Fighter.…”

Prediction of nonlinear propagation of noise from a solid rocket motor

“…Additional arbitrary waveform modeling developments took place in the context of nonlinear sonic boom propagation, [15][16][17] but much of the recent interest has been the noise propagation from modern high-performance tactical aircraft. Nonlinear F/A-18E noise propagation was calculated by Gee et al, 18 Brouwer, 19 and Saxena et al 20 using different GBEbased algorithms. A more comprehensive treatment of the noise radiated by the F-22A Raptor was carried out by Gee et al 4,5 and algorithm refinements were incorporated in a study of the noise propagation from the F-35AA Joint Strike Fighter.…”