...Alexander Avdonin; Wolfgang Polifke Nonintrusive polynomial chaos expansion (NIPCE) is used to quantify the impact of uncertainties in operating conditions on the flame transfer function (FTF) of a premixed laminar flame. NIPCE requires only a small number of system evaluations, so it can...

...Wing Yin Kwong; Adam M. Steinberg This paper describes the coupled flow and flame dynamics during blowoff and reattachment events in a combustor consisting of a linear array of five interacting nozzles using 10 kHz repetition-rate OH planar laser-induced fluorescence and stereoscopic particle image...

... [12] Ranzi , E. , Frassoldati , A. , Grana , R. , Cuoci , A. , Faravelli , T. , Kelley , A. , and Law , C. , 2012 , “ Hierarchical and Comparative Kinetic Modeling of Laminar Flame Speeds of Hydrocarbon and Oxygenated Fuels ,” Prog. Energy Comb. Sci. , 38 ( 4 ), pp...

...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...

... be contributing to the loss in ITE observed in Fig. 4 . However, as anticipated, by increasing the blend ratio beyond 25%, the EGR dilution tolerance decreased due to the lower laminar flame speed of NG compared to E10 [ 7 ]. As shown in Fig. 3 , at blend ratios of 25% and 50% NG, the EGR dilution tolerance...

...Chunyan Li; Suhui Li; Xu Cheng; Min Zhu Pilot flames have been widely used for flame stabilization in low-emission gas turbine combustors. Effects of pilot flame on dynamic instabilities, however, are not well understood. In this work, the dynamic interactions between main and pilot flames...

... URBINES AND P OWER . Manuscript received August 21, 2017; final manuscript received January 9, 2018; published online June 27, 2018. Assoc. Editor: Joseph Zelina. 21 08 2017 09 01 2018 Burners Combustion Combustors Design optimization Flame Fuel combustion Gas turbine...

.... The high-speed images of the full flame spectrum were analyzed with focus given to the optical pilot fuel ignition delay τ O I D , the number of ignited sprays n I S , and the duration t F P until the flame has penetrated half of the combustion chamber. The analysis...

... with an artificially thickened flame approach (ATF) to resolve the flame on the numerical grid, with a flame sensor to ensure that the flame is only thickened in the flame region. For the prediction of the CO and NO x emissions, pollutant species transport equations and a second, CO based, progress variable...

.... Editor: David Wisler. 18 03 2018 11 04 2018 Aerospace applications Combined Composites Environmental Flame Gas turbine technology Particulate Coupled behavior Propulsion systems are required to operate at high temperatures over 1400 °C for various army operations...

... URBINES AND P OWER . Manuscript received March 13, 2018; final manuscript received April 12, 2018; published online June 19, 2018. Editor: David Wisler. 13 03 2018 12 04 2018 Combustion Flame Gas turbine technology Modeling Reliability Thermocouples The penetration...

... on the physics of turbulent flame propagation. The experiments were performed in a single-cylinder heavy-duty compression-ignition (CI) optical engine with a bowl-in piston that was converted to spark ignition (SI) NG operation. The size and growth rate of the early flame from the start of combustion (SOC) until...

... 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...

.... Editor: David Wisler. This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions. 03 11 2017 26 02 2018 Combustion Droplet Engines Evaporation Flame Fuel combustion Power systems Sprays Thermodynamics Vaporization...

...-planar laser-induced fluorescence (PLIF) system is used to record the flame motion at 10,000 fps. In the beginning of the recording, the flame behavior is dominated by relatively low-frequency rotation due to the swirling motion of the flow. These rotational motions then coexist with a thermo-acoustic...

... laser-based diagnostics in atmospheric, jet-wall, stagnation, premixed flames, was published for all isomers of C 1 –C 4 alkane and alcohol fuels. The rapid formation of NO through the flame front via the prompt (Fenimore) route was shown to be strongly coupled to the maximum concentration...

... as the increase of the power output of the engine and has therefore been transferred to a premixed combustor at lab scale. So far stable operation of the system has been obtained for water-to-fuel ratios up to 2.25 at constant adiabatic flame temperatures. This paper focuses on the effects of water injection...

... simulation (LES) framework of two widely employed combustion approaches like the artificially thickened flame (ATF) and the flamelet generated manifold (FGM) is performed using ANSYS fluent v16.2. Two literature test cases with increasing complexity in terms of geometry, flow field, and operating conditions...

...Vera Hoferichter; Thomas Sattelmayer Lean premixed combustion is prevailing in gas turbines to minimize nitrogen oxide emissions. However, this technology bears the risk of flame flashback and thermoacoustic instabilities. Thermoacoustic instabilities induce velocity oscillations at the burner exit...

...Frederik M. Berger; Tobias Hummel; Bruno Schuermans; Thomas Sattelmayer This paper presents the experimental investigation of pulsation-amplitude-dependent flame dynamics associated with transverse thermoacoustic oscillations at screech level frequencies in a generic gas turbine combustor...