... ). 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...

... for multiple cavities. 26 04 2010 29 04 2010 29 10 2010 29 10 2010 aeroacoustics channel flow external flows flow instability flow simulation Navier-Stokes equations seals (stoppers) stators turbomachinery vortices Numerical simulation of annular gas seals...

..., 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. carbon compounds flames hydrogen vortices swirling hydrogen lean blowout It is difficult to determine which of the above descriptions most accurately describes the controlling processes based on analyses of D...

... 2010 06 07 2010 gas cooled reactors sodium stratified flow vortices In order to establish an advanced nuclear fuel cycle system centered around a fast reactor, a feasibility study on the fast reactor cycle and a fast reactor cycle technology development (FaCT) project were...

... 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...

... ) and then introduced to simulations through an UEFR. 05 03 2009 07 09 2009 05 03 2010 05 03 2010 computational fluid dynamics engine cylinders ignition internal combustion engines sparks turbulence vortices dynamic engine simulation steady flow rig tests CFD tumble...

... , 44 , pp. 529 – 538 . 10.1007/s00348-007-0411-2 Borghi , R. , 1988 , “ Turbulent Combustion Modelling ,” Prog. Energy Combust. Sci. 0360-1285 , 14 , pp. 245 – 292 . 10.1016/0360-1285(88)90015-9 Darmofal , D. L. , 1993 , “ The Role of Vorticity Dynamics in Vortex...

... at the middle locations of the two microphones, the present method allows the acoustic velocity, the acoustic mass flux, and the specific acoustic impedance to be determined along the fuel tubing or an air pipe. acoustic waves combustion fuel systems nozzles time-varying systems vortices...

... 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...

... 10.1016/0029-5493(94)90343-3 , 146 , pp. 373 – 381 . Moriya , S. , 1998 , “ Experimental Study of Scale Effects on Onset Conditions of Gas Entrainment by Free Surface Vortices ,” Abiko Research Laboratory, Central Research Institute of Electric Power Industry, Report No. U97073...

... 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...

... fluid oscillations fuel systems gas turbines hydrodynamics laser velocimetry matrix decomposition particle velocity analysis spatiotemporal phenomena turbulence vortices swirling flows PIV LDA POD coherent structures flow instability flow forcing For the past decades, lean...

... 20 11 2008 computational fluid dynamics flow instability fuel systems Navier-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...

... 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...