... Corresponding author. Manuscript received June 22, 2018; final manuscript received June 28, 2018; published online September 14, 2018. Editor: Jerzy T. Sawicki. 22 06 2018 28 06 2018 Acoustic emission Burners Combustion Combustors Computational fluid dynamics Engines Experimental...

...Huangwei Zhang Large eddy simulation (LES) with three-dimensional conditional moment closure (CMC) subgrid model for combustion is applied to simulate a swirl-stabilized nonpremixed methane flame with localized extinction, with special focus on the effects of heat loss to the burner surface...

... premixed prevaporizing-type swirl burner, equipped with a plain jet airblast atomizer, was investigated at various atomizing pressures and combustion air flow rates, using quarls from 0 deg to 60 deg in 15 deg steps. Both the 15 deg and the 30 deg quarls provided a 42% higher lean blowout stability...

..., we demonstrate the validity and robustness of the method by means of a numerical test case with known damping rates before the method is applied to experimental data obtained in a single burner test rig. Various approaches have been proposed in the past to measure the damping rate in a combustor...

... online May 24, 2018. Editor: David Wisler. 08 11 2017 30 12 2017 Burners Combustion Combustors Experimental Flame Gas turbine technology Heat transfer Nonintrusive diagnostics Swirling Temperature Turbulent Visualization Flow velocities within combustors have been...

... and corresponds to t  = 1.11 s. The instability frequency is different between 0.5 s and 1 s than between 1 s and 1.5 s. In general, such frequency changes are due to changes in gas temperature which impacts the speed of sound in the system. This mechanism could be at stake here since the power of the burner...

... of experimentally investigated test-burner configurations and allows a fast prediction prior to testing. Since only one major part of NO x is captured by the CFD simulation, the predicted NO emissions are expected to be slightly lower in comparison to experimentally obtained NO x data. For the DARS-CFD...

... lower positions located slightly off-axis and corresponding to the positions where the axial flow velocity is the lowest. It is finally shown that these positions can be inferred from axial flow velocity profiles under nonreacting conditions. The topology of the flow field near the burner outlet...

... in an atmospheric single burner test rig for typical adiabatic flame temperatures between 1740 and 2086 K. Global measurements of NO x and CO emissions are shown for a wide range of equivalence ratios and variable water-to-fuel ratios. Cantera calculations are used to identify nonequilibrium processes...

.... 22 04 2017 09 08 2017 Under equilibrium conditions, NO x formation in a combustion reaction is on the order of 10 3 ppm. Nevertheless, NO x target emissions in premix burners are set below 100 ppm at 15% O 2 . For gas turbine applications, pollutant emissions are limited to less than...

... manuscript received August 1, 2017; published online November 7, 2017. Editor: David Wisler. 03 07 2017 01 08 2017 Burners Combined Combustion Combustors Energy conversion Flame Fuel combustion Fuels Gas turbine technology Gaseous Measurement techniques Sensors Swirling...

...J. Marrero-Santiago; A. Verdier; C. Brunet; A. Vandel; G. Godard; G. Cabot; M. Boukhalfa; B. Renou Aeronautical gas turbine ignition is still not well understood and its management and control are mandatory for new lean-burner designs. The fundamental aspects of swirled confined two-phase flow...

... of simple flame imaging and a series of image processing protocols discussed in the Soot Isolation Imaging section. Fig. 11 Shift in sooting base (from LII contours) Fig. 10 Soot base location from burner lip (from flame luminosity) Figure 10 quantifies the location of the soot...

..., and extinguish region are observed for both array burners. The amplitude of pressure fluctuation for counterswirl arrangement is less than the coswirl array, and the stable operating window of the counterswirl array is wider. In the unstable combustion region, the counterswirl flame triggers the 2L mode...

... received July 13, 2016; final manuscript received August 17, 2016; published online November 2, 2016. Editor: David Wisler. 13 07 2016 17 08 2016 Burners Combustion Combustors Environmental Experimental Fuel combustion Fuels Gas turbine technology Gaseous Combustion...

... to predict boundary layer flashback using nondimensional parameters. The tool accounts for the thermal coupling between the flame and burner rim and was derived using detailed studies carried out in a test rig at elevated temperature and pressure. The present work evaluates the applicability of the model...

... burners. These burners demonstrate high-performance and reliable operation for the duration of their design lifetime. The design and shape of the burner tip is of great importance in order to achieve a good fuel/ air mixture and at the same time a resistance to the fatigue created by heat radiation input...

... of the combustion chamber. Especially, for highly reactive fuels, boundary layer flashback (BLF) is a serious challenge. For high preheating and burner surface temperatures, boundary layer flashback limits for burner stabilized flames converge to those of so-called confined flames, where the flame is stabilized...

... received June 22, 2016; published online September 13, 2016. Editor: David Wisler. 20 06 2016 22 06 2016 Aeronautical propulsion Aerothermodynamics Burners Combustion Combustors Computational fluid dynamics Droplet Flame Fuel combustion Fuels Gas turbine technology Modeling...

... injection on premixed combustion of natural gas, an atmospheric single burner test rig has been set up at Lehrstuhl für Thermodynamik, TU München. The test rig is equipped with a highly flexible water injection system to study the influence of water atomization behavior on flame shape, position...