... ). This type of flame flashback is caused by a strong interaction between the flame chemistry and vortex dynamics. The analysis of the vorticity transport equation shows that the axial gradient of the azimuthal vorticity is of particular importance for flame stability. A negative azimuthal vorticity gradient...

.... This investigation examines experimentally the effect of blowing ratio of fans in crossflow, and numerically, the effect of the swirl velocity of jets in crossflow, downstream of the injection hole. The experimental results indicated an agreement with typically straight jets in crossflow (no vorticity), illustrating...

...) stators turbomachinery vortices Fluid instabilities in hole-pattern and honeycomb stator seals have been extensively investigated in recent years ( 1 2 3 4 5 ). The results of this body of research indicate that rotor shaft vibrations are caused by cross-coupled forces between the rotor...

..., wrinkling flame with a blue annular film is observed because the excitation induces vortices in the central fuel jet and hence gives rise to the wrinkling of flame. The central jet vortices become larger with the increase in excitation amplitude and thus lead to a wider and shorter flame. If the excitation...

... of holes along the flame that are associated with local extinction. 08 05 2009 03 09 2009 05 08 2010 05 08 2010 carbon compounds flames hydrogen vortices swirling hydrogen lean blowout It is difficult to determine which of the above descriptions most...

... Study of Liquid Properties' Effect on Gas Entrainment Phenomena Induced by Vortices ,” Proceedings of the Eighth International Topical Meeting on Nuclear Reactor Thermal-Hydraulics , Kyoto, Japan, pp. 1735 – 1741 . Adrian , R. J. , 1991 , “ Particle-Imaging Techniques for Experimental Fluid...

... 04 2010 flames swirling flow velocimeters vortices large eddy simulation thickened-flame swirl premixed combustion gas turbine unconfined configuration Land-based gas turbines operate primarily in a lean-premixed mode (LPM) with natural gas as the fuel of choice due...

.... These factors play a crucial role on fuel economy, emissions, and engine performance. dynamic engine simulation steady flow rig tests CFD tumble turbulence computational fluid dynamics engine cylinders ignition internal combustion engines sparks turbulence vortices 05 03 2009...

... 2010 combustion combustion equipment flames gas turbines numerical analysis quenching (thermal) turbulence vortices Experimental CIVB limits and prediction for the TD1 burner with s = 22   mm and d = 12   mm As already mentioned, the scaling law...

... nozzles time-varying systems vortices Industrial gas turbines are typically fueled with natural gas and/or syngas, and the fuel injection ports are usually not choked. Acoustic oscillations in a combustor introduce unsteady fuel and air flow rates into the burner, resulting in heat release rate...

... to the presence of vortices and shear layers around the liquid jet. The data presented here improve the understanding of spray formation processes, and provide benchmark data for computational fluid dynamics (CFD) code validation. 11 10 2007 01 02 2008 15 10 2009 computational fluid...

... confined flow flow measurement stratified flow vortices Gas entrainment by vortices on a free surface in sodium-cooled fast reactor plants is an important phenomenon to design them. Therefore, this phenomenon was investigated by many researchers ( 1 2 3 4 ). In the experiments for a steady...

... body, which energizes the diffusion and mixing process. 07 06 2008 15 10 2008 22 05 2009 combustion damping diffusion flames flow instability fluid oscillations mixing pipe flow vortices wakes combustion instability bluff body stabilization diffusion flames...

... allowing for an access to the second slot. Phase-averaged color maps of the azimuthal vorticity Ω (in s − 1 ) in the ( x b , z b ) -plane of the unforced flow, which evidences the natural helical mode. Four phases of the hydrophone signal (top right) were used...

...-Stokes equations turbulence vortices Swirling flowfields have been utilized for many decades as part of fuel injector design in gas turbine combustion systems. Their primary purpose is to promote a flame-stabilizing recirculation zone that also encourages rapid mixing between incoming fuel...

... of FLUENT 6.2 with the detailed chemical reaction mechanism defined by GRI-MECH 3.0 and other mechanisms for the higher carbon species. The computed flow field of the multijet flame provides an extra intermediate vortex in addition to the two counter-rotating vortices observed for cases of the single...

... the AVC approach an attractive alternative for syngas fuel applications. 26 06 2007 19 07 2007 03 04 2008 carbon compounds combustion gas turbines natural gas technology nitrogen compounds vortices The AVC concept is fundamentally different from conventional swirl...

... take on several forms, which have been shown in previous papers to include both a precessing vortex core (PVC) and the appearance of multiple helical vortices formed in the swirl stream shear layer. The unsteady dynamics of these particular features can play an important role in combustion induced...

... in vortical flows, which propagates upstream into the mixing zone after the equivalence ratio has exceeded a critical value. This bubble then stabilizes the chemical reaction and causes overheat with subsequent damage to the combustion system. Although it was shown earlier that the sudden change...

... were carried out in several selected planes under design operation conditions with simulated total pressure distribution and axial velocity profile. The mean flow fields revealed a complicated vortical flow structure and the major sources of energy loss. Vortices with different scales were observed...