... nozzles rotors stators swirling flow turbulence Subscripts ad = adiabatic atm = ambient coarse = results of the coarser mesh fine = results of the finer mesh h = at receiver hole radius i,j = indices for Cartesian coordinates in = values at inflow...

... 2012 chemically reactive flow combustion combustion equipment flames flow instability flow simulation gas turbines swirling flow turbulence large eddy simulation turbulence chemistry interaction models validation Present-day combustion models often rely on Reynolds...

... out the more effective way to reduce soot emissions. combustion diesel engines fuel economy fuel systems heat losses heat transfer military vehicles nanoparticles petroleum smoke soot swirling flow 10 12 2010 20 12 2010 14 12 2011 14 12 2011 2012...

...Stephan Burmberger; Thomas Sattelmayer A frequently employed method for aerodynamic flame stabilization in modern premixed low emission combustors is the breakdown of swirling flows; with carefully optimized tailoring of the swirler, a sudden transition in the flow field in the combustor can...

.... boiling heat transfer invertors pipe flow pumps swirling flow turbulence undercooling The knowledge of subcooled water flow boiling heat transfer (HT) in a circular tube with twisted-tape insert is important to discuss the mechanism of critical heat flux. Many researchers have...

... ratio that more closely matches the swirl history was compared. The swirl flow therefore is an important operating parameter to consider when initializing a CFD simulation of diesel engine combustion. Often full optical characterization of the flowfield is not available. Although studies using PIV...

... 04 2010 19 04 2010 27 10 2010 27 10 2010 flames fluid oscillations gas turbines swirling flow Lean-premixed combustion has been successful in meeting current NO x emission regulations; however, this has been achieved at the expense of increased...

... (Fig. 1 ). This distance was chosen to avoid any hydrodynamic pressure perturbation from the swirling flow inside the premixer. The reflection coefficient at the same location is then estimated using data measured at the mass flow meter/controller outlet located at L 1 = 1.2   m...

... Instabilities by Interaction of Acoustics and Unstable Swirling Flow ,” AIAA J. 0001-1452 , 38 ( 6 ), pp. 1025 – 1034 . 10.2514/2.1063 Moeck , J. P. , Bothien , M. R. , Guyot , D. , and Paschereit , C. O. , 2007 , “ Phase-Shift Control of Combustion Instability Using (Combined...

... model with enhanced wall treatment is employed to model turbulent swirl flow, whereas eddy break-up (EBU), presumed probability density function laminar flamelet model, and partially premixed coherent flame model (PCFM) are tried for reacting flow in the combustor. Independent simulations are carried...

... flow instability compressors impellers Mach number pistons compressible flow swirling flow flow simulation rotordynamic coefficients impeller-shroud forces Multistage centrifugal compressors using shrouded impellers have been notably subject to rotordynamic instabilities for many...

... ,   L = 0 % ) : ( a ) axial and ( b ) tangential component. Isolines represent u in both plots. As two fundamentally different types of swirl flow patterns were found for the four operating conditions, the transition of the flow field between these patterns was studied...

.... These property variations can have profound effects on the behavior of swirling jets. supercritical injection supercritical jets supercritical swirling jets fuel jets nozzles sprays swirling flow 24 07 2007 08 04 2008 18 05 2010 2010 American Society of Mechanical...

...Ashoke De; Shengrong Zhu; Sumanta Acharya An unconfined strongly swirled flow is investigated for different Reynolds numbers using particle image velocimetry (PIV) and large eddy simulation (LES) with a thickened-flame (TF) model. Both reacting and nonreacting flow results are presented. In the LES...

... aerodynamics combustion combustion equipment confined flow flames jets swirling flow transfer functions The stability of lean premixed combustion systems with regard to self-sustained combustion instabilities can be evaluated with a stability analysis using the acoustic network modeling approach...

... damage. flames swirling flow 09 04 2009 19 07 2009 18 03 2010 2010 American Society of Mechanical Engineers ...

... characteristics at the development stage, a complete understanding of the nature of combustion instabilities will be required and sophisticated theoretical models must be developed ( 1 2 ). chemiluminescence combustion flames gas turbines heat transfer swirling flow turbulence 21 03 2009...

.... Sci. 0360-1285 10.1016/j.pecs.2005.10.002 , 32 ( 2 ), pp. 93 – 161 . 24 07 2008 06 09 2008 05 06 2009 combustion flow control flow instability swirling flow turbulence perforated plate impedance passive control flame-acoustic interaction combustion...

... are shown in Figs. 7a 7b , respectively. Without the swirler, the droplet deposition takes place all over the barrel. In the case of swirling flow, the rotational speed of the flow increases with J G , and as shown in Fig. 7b spiral...

... 26 03 2008 25 04 2008 22 08 2008 exhaust systems gas turbines nozzles swirling flow In aerospace applications, the bends are required to (i) avoid internal parts in the way of the exhaust or (ii) direct hot exhaust gases away from the structural components or (iii) hide...