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Showing 1 to 4 of 4 for “"Mach waves"”.
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Space-time Description of Supersonic Jets with Thermal Non-uniformity
… velocity deficit into a perfectly expanded Mach 1.5 jet. The results indicate $2 pm 0.5$ dB reductions in peak narrowband spectral sound pressure levels upstream of peak directivity directions for the non-uniform jet compared to a thermally uniform baseline, even for static thrust matched …
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The Effect of Thermal Non-Uniformity on Coherent Structures in Supersonic Free Jets
… to generate a perfectly expanded, heated flow of Mach 1.5 and a nozzle pressure ratio (NPR) of 3.67. The unheated plume was introduced at the center of the nozzle, with a total temperature ratio (TTR) of 2. Comparison of the mean velocity fields shows that the introduction of the cooler …
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Coalescence of nonlinear acoustic waves, with application to supersonic jet noise
… an explanation for the observation of steepened Mach waveforms and crackle close to a lab-scale, Mach 3 jet flow in prior studies, which contradicted theoretical predictions for that jet. A numerical model based on the Khokhlov–Zabolotskaya–Kuznetsov (KZK) nonlinear wave equation is developed to …
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Fundamental physics and application of plasma actuators for high-speed flows
… included plasma generated by laser energy, microwaves, and electric arc. The plasma generated by laser energy was also applied to a sonic transverse jet in a supersonic cross flow. Lastly, the particle image velocimetry diagnostic was considered and a technique developed to evaluate measurement …