...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...

...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...

... OWER . Manuscript received November 22, 2017; final manuscript received June 28, 2018; published online August 20, 2018. Assoc. Editor: Eric Petersen. 22 11 2017 28 06 2018 Combustion Combustors Computational fluid dynamics Energy conversion Flame Fuels Gas turbine...

...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...

... fluid dynamics Energy Engines Flame Fuel combustion Fuels Thermodynamics Combustion The increasing availability and low price of natural gas (NG) compared to other petroleum-based fuels in the U.S. are the main reasons for the growing interest in this energy carrier. It is projected...

... a moderately extended blowout stability limitation, while the NO x emission slightly increased and the CO emission reduced compared to the baseline burner. Burners Combustion Combustors Design optimization Flame Fuel combustion Gas turbine technology Sprays Swirling Steady liquid fuel...

... 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...

... for RASW-1 had to be restarted for a variety of reasons (e.g., thermocouples, flame out). Figure 18 illustrates the backside surface temperature. Several backside thermocouples were either broken or lost contact with the sample during phase 2 tests, which reduced the amount of data available for analysis...

... but only 2.5 at λ  = 2.20. The shorter ignition delay in combination with the higher number of ignited sprays results in drastically reduced combustion durations as the t ¯ F P values prove. In the case of λ  = 2.20, an optical 50% flame propagation was not achieved within the camera...

... . 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 of intermittent renewable...

... 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...

.... This seems to indicate that the increased temperature of the main flame jet at the downstream location increases heat flux to the liner, which could not be observed in nonreacting heat transfer studies. Moving forward, heat transfer measurements are planned to be performed for different reacting conditions...

... Evaporation Flame Fuel combustion Power systems Sprays Thermodynamics Vaporization According to the single fuel policy, adopted by the U.S. Department of Defense (DoD), the U.S. military ground vehicles, as well as air forces, must operate on a single fuel to minimize the number of different...

...-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...

... of a novel criterion for the resonance frequencies of the intrinsic thermo-acoustic (ITA) feedback loop. This criterion takes into the account the flow inertia of the burner and indicates that in the limit of very large flow inertia, ITA resonance should appear at frequencies where the phase of the flame...