To better understand the characteristics of the dominant noise components, we will examine the jet noise spectra at
afterburner in Figs. 9 and 10, as well as the noise spectra of Gee et al. [2]. From the known jet mixing noise characteristics
(see Tametal. [6,7]) we expect fine-scale turbulence noise to be the dominant noise component at low inlet angles. Fig. 16
shows the noise spectrum at a 601 inlet angle.The fine-scale turbulence noise spectrum from Fig. 2 is plotted in this figure as
a dotted curve.It is seen that, indeed,the fine-scale turbulence noise is dominant ,as evidenced by the good match between
the spectrum from Fig. 2 and the measured data.However,in the range of 600 800Hz,there is a noise peak that is
distinctly unrelated to the fine-scale turbulence noise.This peak is possibly that of a new noise component . To see how this