ORCID Profile
0000-0001-7318-8698
Current Organisations
University of Birmingham
,
Murdoch University
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Publisher: MDPI AG
Date: 29-03-2019
DOI: 10.3390/APP9071320
Abstract: The oxidation of methane under oxy-fuel combustion conditions with carbon capture is attractive and deserves huge interest towards reducing CO2 and NOx emissions. The current paper reports on the predictions and analysis of combustion characteristics of a turbulent oxy-methane non-premixed flame operating under highly diluted conditions of CO2 and H2 in oxidizer and fuel streams, respectively. These are achieved by applying a novel, well-designed numerical combustion model. The latter consists of a large eddy simulation (LES) extension of a recently suggested hybrid model in Reynolds averaging-based numerical simulation (RANS) context by the authors. It combines a transported joint scalar probability density function (T-PDF) following the Eulerian Stochastic Field methodology (ESF) on the one hand, and a flamelet progress variable (FPV) turbulent combustion model under consideration of detailed chemical reaction mechanism on the other hand. This novel hybrid ESF/FPV approach removes the weaknesses of the presumed-probability density function (P-PDF)-based FPV modeling, along with the solving of associated additional modeled transport equations while rendering the T-PDF computationally less affordable. First, the prediction capability of the LES hybrid ESF/FPV was appraised on the well-known air-piloted methane jet flame (Sandia Flame D). Then, it was assessed in analyzing the combustion properties of a non-premixed oxy-flame and in capturing the CO2 dilution effect on the oxy-fuel flame behavior. To this end, the so-called oxy-flame B3, already numerically investigated in a RANS context, was analyzed. Comparisons with experimental data in terms of temperature, scalar distributions, and scatter plots agree satisfactorily. Finally, the impact of generating the FPV chemistry table under condition of unity Lewis number, even with CO2 dilution, was investigated on the general prediction of the oxy-fuel flame structure, stability and emissions. In particular, it turns out that 68% molar percentage of CO2 leads to 0.39% of CO formation near the burner fuel nozzle and 0.62% at 10 dfuel above the nozzle.
Publisher: Elsevier BV
Date: 07-2018
Publisher: Springer Science and Business Media LLC
Date: 24-04-2018
DOI: 10.1007/S10494-018-9904-8
Abstract: We present large-eddy simulation (LES) of a high-pressure gas jet that is injecting into a quiescent inert environment. The injection is through a nozzle with a diameter of 1.35 mm. Four injection strategies are considered in which the results of a single continuous injection case are compared with those of double injection cases with different injection splitting timing. In all double injection cases, the injection pulsing interval is kept the same, and the total injected mass is equal to that of the single injection case. On the other hand, the splitting timing is varied to investigate the effects of various injection splitting strategies on the mixture formation and the penetration length of the jet. Results show that the jet penetration length is not so sensitive to the splitting timing whereas the mixing quality can significantly change as a result of shifting the onset of injection splitting toward the end of injection. Especially, it is found that by adopting a post-injection strategy where a single injection splits into the main injection and late small injection near the end of injection period the mixing between the injected gas and ambient air is significantly improved. This trend is not as obvious when the injection splitting timing shifts toward the beginning or even in the middle of injection period. The increase of entrainment in the tail of each injection is one of the underlying physics in the mixing improvement in double injection cases. In addition to that, splitting a single injection into two smaller injections increases the surrounding area of the jet and also stretches it along the axial direction. It can potentially increase the mixing of injected gas with the ambient air.
Publisher: Elsevier BV
Date: 11-2016
Publisher: Informa UK Limited
Date: 13-07-2015
Publisher: Elsevier BV
Date: 08-2009
Publisher: Elsevier BV
Date: 2013
Publisher: Informa UK Limited
Date: 04-2015
Publisher: SAE International
Date: 04-2014
DOI: 10.4271/2014-01-1254
Publisher: Elsevier BV
Date: 11-2022
Publisher: Springer Science and Business Media LLC
Date: 23-08-2014
Publisher: Elsevier BV
Date: 11-2008
Publisher: Informa UK Limited
Date: 30-10-2018
Publisher: SAE International
Date: 28-03-2017
DOI: 10.4271/2017-01-0560
Publisher: MDPI AG
Date: 14-11-2018
DOI: 10.3390/EN11113158
Abstract: In the present paper, the behaviour of an oxy-fuel non-premixed jet flame is numerically investigated by using a novel approach which combines a transported joint scalar probability density function (T-PDF) following the Eulerian Stochastic Field methodology (ESF) and a Flamelet Progress Variable (FPV) turbulent combustion model under consideration of detailed chemical reaction mechanism. This hybrid ESF/FPV approach overcomes the limitations of the presumed- probability density function (P-PDF) based FPV modelling along with the solving of associated additional modelled transport equations while rendering the T-PDF computationally less demanding. In Reynolds Averaged Navier-Stokes (RANS) context, the suggested approach is first validated by assessing its general prediction capability in reproducing the flame and flow properties of a simple piloted jet flame configuration known as Sandia Flame D. Second, its feasibility in capturing CO2addition effect on the flame behaviour is demonstrated while studying a non-premixed oxy-flame configuration. This consists of an oxy-methane flame characterized by a high CO2 amount in the oxidizer and a significant content of H2 in the fuel stream, making it challenging for combustion modelling. Comparisons of numerical results with experimental data show that the complete model reproduces the major properties of the flame cases investigated and allows achieving the best agreement for the temperature and different species mass fractions once compared to the classical presumed PDF approach.
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier BV
Date: 2019
Publisher: Informa UK Limited
Date: 02-01-2014
Publisher: Elsevier BV
Date: 05-2019
Publisher: SAE International
Date: 04-2014
DOI: 10.4271/2014-01-1127
Publisher: Elsevier BV
Date: 02-2015
Publisher: Oxford University Press (OUP)
Date: 26-04-2021
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 2010
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 07-2017
Publisher: SAE International
Date: 10-09-2018
DOI: 10.4271/2018-01-1726
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 2009
Publisher: American Physical Society (APS)
Date: 12-08-2020
Publisher: SAE International
Date: 08-10-2017
DOI: 10.4271/2017-01-2194
Publisher: Springer Science and Business Media LLC
Date: 05-06-2009
Publisher: Elsevier BV
Date: 2021
Publisher: SAE International
Date: 09-09-2019
DOI: 10.4271/2019-24-0010
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 2013
Publisher: SAE International
Date: 02-04-2019
DOI: 10.4271/2019-01-0211
Publisher: Informa UK Limited
Date: 26-09-2011
Publisher: Informa UK Limited
Date: 12-2012
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 06-2015
Publisher: Informa UK Limited
Date: 21-09-2015
Publisher: Elsevier BV
Date: 02-2019
Publisher: SAE International
Date: 09-09-2019
DOI: 10.4271/2019-24-0007
Publisher: Elsevier BV
Date: 12-2014
Publisher: SAE International
Date: 10-09-2012
DOI: 10.4271/2012-01-1660
Publisher: Elsevier BV
Date: 11-2019
Publisher: Springer Science and Business Media LLC
Date: 06-09-2012
Publisher: Elsevier BV
Date: 12-2018
Publisher: SAE International
Date: 04-2014
DOI: 10.4271/2014-01-1144
Publisher: SAE International
Date: 16-04-2012
DOI: 10.4271/2012-01-0139
Publisher: SAE International
Date: 08-10-2017
DOI: 10.4271/2017-01-2209
Publisher: SAE International
Date: 02-04-2019
DOI: 10.4271/2019-01-0220
Publisher: Elsevier BV
Date: 2017
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2016
End Date: 2019
Funder: Vetenskapsrådet
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