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Showing 1 to 5 of 5 for “"Precessing Vortex Core"”.
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Flow Field and Soot Formation Characteristics in Swirl-stabilized Non-premixed Turbulent Flames
… flames exhibited a large-scale structure of precessing vortex core which was then suppressed under reacting conditions. In Jet A-1 flames, spray pattern changed from V-shaped hollow cone to semi-solid cone when air flow rate increased by 20%, resulting in a 60% reduction in peak time-averaged …
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On Turbulent Swirling Jets: Vortex Breakdown, Coherent Structures, and their Control
… Durch das sogenannte Aufplatzen des Wirbelkerns (vortex breakdown) entsteht eine Rückströmblase auf der Strahlachse wodurch sich eine innere und eine äußere Scherschicht manifestiert. Die Analyse und Kontrolle dieser komplexen Strömungskonfiguration stellt allgemein eine große Herausforderung für …
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The Evaluation of Time-Dependent Flow in Swirl Burners
… with time-dependent<br/>flows to simulate the Precessing Vortex Core.<br/><br/>This investigation showed very good agreement with experimental velocity data with less constrained boundary conditions that had previously obtained. The time-dependent simulation was limited by the computer speed …
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Applications of femtosecond coherent anti-stokes Raman scattering in combustion
… the characteristic thermo-acoustic pulsation and precessing vortex core frequency previously reported in the literature by DLR. The real limitation of CPP fs-CARS thermometry has proven to be that of detector dynamic range. Signal levels were observed to be approximately a factor of 1000 times …
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Simulations of turbulent swirl combustors
… flames are investigated, such as precession or vortex formation caused by flow oscillations, as well as various combustion aspects such as localized extinctions and flame lift-off. All the above affect flame stabilization in different ways and are explored through focused simulations. The first …