PLIF measurements of non-thermal NO concentrations in alcohol and alkane premixed flames

Bohon, Myles D.; Guiberti, Thibault F.; Roberts, William L.

doi:10.1016/j.combustflame.2018.05.024

Cited by 24 publications

(4 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, the same group [39] published LIF NO measurements in high pressure lean methane-air stagnation flames (P = 0.2, 0.4 and 0.8 MPa), with a modelling study using the NUIG mechanism [40]. Bohon et al [41,42] also studied NO formation in alcohol and alkanes premixed flames at atmospheric pressure. Zhou et al [43] investigated the effect of CH4 content in syngas flames on NO formation in a premixed flat flame burner at atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

NO formation in high pressure premixed flames: Experimental results and validation of a new revised reaction mechanism

Persis

Pillier

Idir

et al. 2020

Fuel

View full text Add to dashboard Cite

This paper presents an experimental and modelling study of NO formation in high pressure premixed flames.Experiments were performed in a high-pressure counterflow burner in which laminar premixed CH4/air flames were stabilised at equivalence ratios of E.R=0.7, 1 and 1.2 and for pressures varying from 0.1 to 0.7 MPa. We report quantitative NO mole fraction profiles measured by Laser Induced Fluorescence. The effects of pressure and equivalence ratio on NO formation are discussed. These results are compared to the simulations using two reaction mechanisms: NOmecha2.0 associated to a detailed mechanism for methane oxidation: GDFkin ® 3.0 and the mechanism from Klippenstein et al., which is the most recent high-pressure NOx formation mechanism available in the literature. In general, both mechanisms are able to predict NO correctly in lean and stoichiometric high pressure flames; however, in rich flames, GDFkin ® 3.0_NOmecha2.0 gives the best predictions. The performances of these mechanisms are also tested on NO measurements in high-pressure flames from the literature.A kinetic analysis is then presented to identify the main pathways that lead to the formation and consumption of NO and highlight the differences between the two mechanisms, as well as a sensitivity analysis to identify important reactions that influence the formation/consumption of NO in our high pressure flames.

show abstract

Section: Introductionmentioning

confidence: 99%

NO formation in high pressure premixed flames: Experimental results and validation of a new revised reaction mechanism

Persis

Pillier

Idir

et al. 2020

Fuel

View full text Add to dashboard Cite

show abstract

“…The example of flame extinction will be discussed in greater detail later when we compare Large-Eddy Simulations used for finite-rate kinetic effects against local flame extinction inferred from fast OH-PLIF, which has allowed very thorough validation of the sub-grid turbulent combustion model. Recent developments in PLIF include the imaging of NO [61], soot precursors like Poly-cyclic Aromatic Hydrocarbons (PAH) [62], H atom [63] and HCO [64]. The technical difficulties, resolution issues, lasers and cameras needed are discussed in the original papers.…”

Section: Experimental Diagnosticsmentioning

confidence: 99%

Turbulent Combustion Modelling and Experiments: Recent Trends and Developments

Giusti

Mastorakos

2019

Flow Turbulence Combust

View full text Add to dashboard Cite

The development of better laser-based experimental methods and the fast rise in computer power has created an unprecedented shift in turbulent combustion research. The range of species and quantities measured and the advent of kHz-level planar diagnostics are now providing great insights in important phenomena and applications such as local and global extinction, pollutants, and spray combustion that were hitherto unavailable. In simulations, the shift to LES allows better representation of the turbulent flow in complex geometries, but despite the fact that the grid size is smaller than in RANS, the push towards realistic conditions and the need to include more detailed chemistry that includes very fast species and thin reaction zones emphasize the necessity of a sub-grid turbulent combustion model. The paper discusses examples from current research with experiments and modelling that focus on flame transients (self-excited oscillations, local extinction), sprays, soot emissions, and on practical applications. These demonstrate how current models are being validated by experimental data and the concerted efforts the community is taking to promote the modelling tools to industry. In addition, the various coordinated International Workshops on non-premixed, premixed, and spray flames, and on soot are discussed and some of their target flames are explored. These comprise flames that are relatively simple to describe from a fluid mechanics perspective but contain difficult-to-model combustion problems such as extinction, pollutants and multi-mode reaction zones. Recently, swirl spray flames, which are more representative of industrial devices, have been added to the target flames. Typically, good agreement is found with LES and some combustion models such as the progress variable-mixture fraction flamelet model, the Conditional Moment Closure, and the Transported PDF method, but predicting soot emissions and the condition of complete extinction in complex geometries is still elusive.

show abstract

“…Numerous optical-based imaging techniques have been introduced in recent years, with an impressive list consisting of, but not limited to, planar laser-induced fluorescence (PLIF) [ 16 , 17 , 18 ], laser-induced fluorescence (LIF) [ 19 , 20 ], particle-imaging velocimetry (PIV) [ 21 , 22 , 23 ], and planar Doppler velocimetry (PDV) [ 24 , 25 ]. Nevertheless, many of them are consistently susceptible and limited to both required active seeding and background noise interference in actual flow fields diagnosis.…”

Section: Introductionmentioning

confidence: 99%

Pre-Shaped Burst-Mode Hybrid MOPA Laser System at 10 kHz Pulse Frequency

Zhang

Peng

et al. 2023

Sensors

View full text Add to dashboard Cite

A temporal pre-shaped burst-mode hybrid fiber-bulk laser system was illustrated at a 10 kHz rate with a narrow spectral linewidth. A theoretical model was proposed to counteract the temporal profile distortion and compensate for the desired one, based on reverse process of amplification. For uniformly modulated injection, amplified shapes were recorded and investigated in series for their varied pulse duration, envelope width and amplification delay, respectively. The pre-shaped output effectively realized a uniform distribution on a time scale for both the burst envelope and pulse shape under the action of the established theoretical method. Compared with previous amplification delay methods, this model possesses the capacity to extend itself for applications in burst-mode shaping with variable parameters and characteristics. The maximum pulse energy was enlarged up to 9.68 mJ, 8.94 mJ and 6.57 mJ with a 300 ns pulse duration over envelope widths of 2 ms to 4 ms. Moreover, the time-averaged spectral bandwidths were measured and characterized with Lonrentz fits of 68.3 MHz, 67.2 MHz and 67.7 MHz when the pulse duration varied from 100 ns to 300 ns.

show abstract

PLIF measurements of non-thermal NO concentrations in alcohol and alkane premixed flames

Cited by 24 publications

References 54 publications

NO formation in high pressure premixed flames: Experimental results and validation of a new revised reaction mechanism

NO formation in high pressure premixed flames: Experimental results and validation of a new revised reaction mechanism

Turbulent Combustion Modelling and Experiments: Recent Trends and Developments

Pre-Shaped Burst-Mode Hybrid MOPA Laser System at 10 kHz Pulse Frequency

Contact Info

Product

Resources

About