000014807 001__ 14807
000014807 005__ 20161115100202.0
000014807 04107 $$aeng
000014807 046__ $$k2016-08-21
000014807 100__ $$aBuchta, David
000014807 24500 $$aMechanisms of jet crackle

000014807 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014807 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014807 506__ $$arestricted
000014807 520__ $$2eng$$aCrackle is a particularly intense and annoying characteristic of the noise radiated by high-speed (supersonic) jets. Pressure traces show evidence of relatively strong compression in the sound field and more extreme positive than negative pressure fluctuations thus leading to positive skewness. To study its mechanisms, a turbulent free shear flow and its near acoustic field is directly simulated without modeling approximations. The simulations confirm that the ‘footprint’ of pressure skewness originates close to or within the turbulence. A supersonic flow which includes weak gas dynamic nonlinearities over a wavy-wall, with characteristics set to match scales of the turbulence, suggest a basic mechanism that potentially underlies the generation of crackle’s near-field pressure fluctuations.

000014807 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014807 653__ $$a

000014807 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014807 720__ $$aBuchta, David
000014807 8560_ $$ffischerc@itam.cas.cz
000014807 8564_ $$s167375$$uhttps://invenio.itam.cas.cz/record/14807/files/TS.FS01-2.01.pdf$$yOriginal version of the author's contribution as presented on CD,  page 3049, code TS.FS01-2.01
.
000014807 962__ $$r13812
000014807 980__ $$aPAPER