Abstract by Kevin Leete
Physics and Astronomy
Kent Gee, Traci Neilsen
Trends in Military Aircraft Jet Noise Across Engine Condition
The primary source of noise from high-performance military aircraft is the turbulent mixture of the exhaust with the ambient air. The condition at which the engine runs (from idle to maximum afterburner) significantly changes certain features of the radiated field. This study examines data collected from static measurements of a tethered military aircraft as it operated under various engine conditions. Additionally, an advanced field imaging technique called Multisource, Statistically Optimized Near-field Acoustical Holography was employed to visualize the field in locations where measurements were unobtainable. Multiple radiation lobes are identified in the direction of maximum radiation which shift in directivity and relative importance in the field as engine condition increases.