{"id":30217,"date":"2020-08-21T12:54:27","date_gmt":"2020-08-21T12:54:27","guid":{"rendered":"http:\/\/tugraztestweb.asol.at\/gesamtverzeichnis\/unkategorisiert\/analysis-of-the-dynamics-at-the-base-of-a-lifted-strongly-buoyant-jet-flame-using-direct-numerical-simulation-2\/"},"modified":"2020-08-21T14:55:27","modified_gmt":"2020-08-21T12:55:27","slug":"analysis-of-the-dynamics-at-the-base-of-a-lifted-strongly-buoyant-jet-flame-using-direct-numerical-simulation-ebook","status":"publish","type":"product","link":"https:\/\/tugraztestweb.asol.at\/en\/gesamtverzeichnis\/maschinenbau-und-wirtschaftswissenschaften\/analysis-of-the-dynamics-at-the-base-of-a-lifted-strongly-buoyant-jet-flame-using-direct-numerical-simulation-ebook\/","title":{"rendered":"Analysis of the dynamics at the Base of a Lifted Strongly Buoyant Jet Flame Using Direct Numerical Simulation"},"content":{"rendered":"

Sorry, this entry is only available in Deutsch<\/a>.<\/p>

Non-premixed jet flames represent a generic flame configuration with high relevance in many
combustion devices. The present work computationally investigates the case of a strongly
buoyant
\n non-premixed turbulent jet flame using Direct Numerical Simulation
\n(DNS). The simulation results unveil a weak upstream effect of the flame
\n on the non-burning region ahead of the flame base. A comparatively more
\n substantial effect of the flame is seen in the largescale motion, which
\n evolves under the influence of the periodic formation, growth, and
\ndeparture of large bulb-shaped low-density structures at the flame base,
\n as it is also seen in experiments. The analysis of the dominant
\nstability mechanism of the flame base essentially supports the
\nestablished concept of edge-flame propagation. Moreover, the
\nbuoyancy-driven large-scale flow structures temporally generate a
\nfurther highly critical scenario, where large circumferential sections
\nof the flame base recede deeply downstream, which is shown to be
\ntriggered by high local values of the scalar dissipation rate. With this
\n particular scenario the present work does not only bring to light an
\nimportant stabilization mechanism governed by large three-dimensional
\nstructures, it also recalls the relevance of the scalar dissipation
\nrate, whose effect is often discarded in the commonly accepted theories
\non flame stabilization.
<\/p>","protected":false},"excerpt":{"rendered":"

Sorry, this entry is only available in Deutsch<\/a>.<\/p>\n

Non-premixed jet flames represent a generic flame configuration with high relevance in many
combustion devices. The present work computationally investigates the case of a strongly
buoyant
\n non-premixed turbulent jet flame using Direct Numerical Simulation
\n(DNS). The simulation results unveil a weak upstream effect of the flame
\n on the non-burning region ahead of the flame base. A comparatively more
\n substantial effect of the flame is seen in the largescale motion, which
\n evolves under the influence of the periodic formation, growth, and
\ndeparture of large bulb-shaped low-density structures at the flame base,
\n as it is also seen in experiments. The analysis of the dominant
\nstability mechanism of the flame base essentially supports the
\nestablished concept of edge-flame propagation. Moreover, the
\nbuoyancy-driven large-scale flow structures temporally generate a
\nfurther highly critical scenario, where large circumferential sections
\nof the flame base recede deeply downstream, which is shown to be
\ntriggered by high local values of the scalar dissipation rate. With this
\n particular scenario the present work does not only bring to light an
\nimportant stabilization mechanism governed by large three-dimensional
\nstructures, it also recalls the relevance of the scalar dissipation
\nrate, whose effect is often discarded in the commonly accepted theories
\non flame stabilization.<\/p>\n","protected":false},"featured_media":39831,"comment_status":"open","ping_status":"closed","template":"","meta":[],"yoast_head":"\n\n\n\n\n\n\n\n\n\n\t\n\t\n\n\n\t\n