Abstract
The noise source characteristics of subsonic jets have been investigated using a directional microphone system in an anechoic chamber. The directional microphone system used is of the reflector type having a diameter of 36 in. and a focal length of 2612 in. As expected, this system is diffraction limited, thereby resulting in a loss of resolution. A special numerical method was used to recover the axial source strength distribution from the diffracted data. Measurements have been performed in the farfield of both a 1- and 2-in. diameter jet operating at exit Mach numbers ranging from 0.6 to 1. Results are presented for both source strength distribution along the jet and spectra of noise radiated from localized regions of the jet. These results were then integrated to obtain the overall noise power and spectrum for comparison with measurements obtained by means of a single nondirectional microphone. [This work has been supported by the Department of Transporation under Grant No. DOT-OS-00002.]
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