Screech tones of supersonic jets from bevelled rectangular nozzles
نویسندگان
چکیده
منابع مشابه
Flow structure and acoustics of supersonic jets from conical convergent-divergent nozzles
Conical convergent-divergent (CCD) nozzles represent an important category of supersonic jet-engine nozzles which require variable throat areas and variable exit areas to adapt to a range of operating conditions. CCD nozzles with design Mach numbers of 1.3, 1.5, and 1.65 are examined experimentally over a range of fully expanded Mach numbers from 1.22 to 1.71. The characteristics of the flow an...
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Experiments have characterized the acoustics of axisymmetric high-speed jets at a variety of Mach numbers and velocities and at pressure-matched, overexpanded, and underexpanded conditions. The effect of an annular secondary ow on noise emission was also investigated.The fully expanded jet velocity ranged from 630 to 920m/s and the fully expanded jet Mach number ranged from 1.27 to 1.75.The s...
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The mixing noise in jet engine exhaust is one of the main noise sources in aviation. Nozzle lip serrations, commonly called chevrons, are one of the technologies deployed to address the issue in modern civilian aircraft. These nozzle serrations impinge on the shear layer and change its dynamics; the jet plume becomes lobed or serrated near the nozzle in a time-averaged sense, but reverts to a r...
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We study the viscous spatial linear stability characteristics of the time-averaged flow in turbulent subsonic jets issuing from serrated (chevroned) nozzles, and compare them to analogous round jet results. Linear parabolized stability equations (PSE) are used in the calculations to account for the non-parallel base flow. By exploiting the symmetries of the mean flow due to the regular arrangem...
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The space-time conservation element and solution element (CE/SE) method is used to solve the conservation law form of the compressible axisymmetric Navier-Stokes equations. The equations are time marched to predict the unsteady flow and the near-field screech tone noise issuing from an underexpanded circular jet. The CE/SE method uses an unstructured grid based data structure. The unstructured ...
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ژورنال
عنوان ژورنال: AIAA Journal
سال: 1997
ISSN: 0001-1452,1533-385X
DOI: 10.2514/3.13636