Thursday, April 19, 2012
Mechanical and Civil Engineering Seminar
Supersonic Jet Noise Prediction Using Unstructured Large-Eddy Simulation
Joseph William Nichols, Stanford Unversity
The aeroacoustics of supersonic jets are intricately connected to turbulence in the jet shear layers and just downstream of the potential core. For pressure mismatched jets, the interplay between this turbulence and shocks is also important. Despite significant scientific investigation into this complex multiscale dynamic phenomenon, jet noise remains a large component of the overall noise generated by supersonic aircraft. This is of particular concern on aircraft carriers, where it is necessary for deck personnel to be in close proximity to aircraft at takeoff and landing. In such harsh acoustics environments (150 dB), even the most advanced hearing protection cannot offer complete protection from long-term exposure.