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Updated: May 10, 2026

Visualization of High Speed Liquid Jet Impaction on a Moving Surface
Published on: April 17, 2015
Skewness and shock formation in laboratory-scale supersonic jet data
Kent L Gee1, Tracianne B Neilsen, Anthony A Atchley
1Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA. kentgee@byu.edu
Abstract:
Spatial properties of noise statistics near unheated, laboratory-scale supersonic jets yield insights into source characteristics and near-field shock formation. Primary findings are (1) waveforms with positive pressure skewness radiate from the source with a directivity upstream of maximum overall level and (2) skewness of the time derivative of the pressure waveforms increases significantly with range, indicating formation of shocks during propagation. These results corroborate findings of a previous study involving full-scale engine data. Further, a comparison of ideally and over-expanded laboratory data show that while derivative skewness maps are similar, waveform skewness maps are substantially different for the two cases.
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