A numerical study of thermal and chemical effects in interactions of n-heptane flames with a single surface

Owston, Rebecca; Magi, Vinicio; Abraham, John

doi:10.1016/j.combustflame.2006.10.006

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…It was demonstrated that the wall heat flux normalised with the heat release rate of the flame is a characteristic feature of quenching. It remains constant at around 0.3 for head-on quenching for a wide variety of equivalence ratios [18,23,38], hydrocarbon fuels [18,21,23,29,38], pressures [25,37] and wall temperatures [14,15,18,21,29,34]. In a similar manner, the quenching distance can be normalised with the laminar flame thickness l F yielding the second characteristic quantity of flame-wall interactions, the so-called Peclet number Pe Q ¼ y Q =l F , which typically ranges between 3 and 4 for laminar head-on quenching.…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental and simulative investigation of flame–wall interactions and quenching in spark-ignition engines

Suckart

Linse

Schutting

et al. 2016

Automot. Engine Technol.

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Flame-wall interactions are a crucial aspect concerning the design and optimisation of a spark-ignition engine. To improve the understanding of the phenomenon, flame-wall interactions are investigated by highly resolved wall heat flux measurements. For this purpose, a turbocharged, direct-injected spark-ignition engine was equipped with eight surface thermocouples and operated at five measuring points to examine the influence of speed, load, charge motion and equivalence ratio on the quenching process. A cycle-resolved analysis is utilized to extract the wall heat fluxes during flame-wall interaction which are subsequently used to calculate the quenching distances, as well as the normalised wall heat fluxes and Peclet numbers. To correctly estimate these values, a simulative methodology based upon a 3D-CFD in-cylinder flow and a 1D flame calculation with detailed chemical kinetics is employed. The 3D-CFD in-cylinder flow was combined with a 3D-FE heat conduction and 3D-CFD coolant flow simulation to properly predict the wall temperatures and thereby the near-wall flow state. The findings show that the quenching distance is proportional to the laminar flame thickness at first order. Hence, the engine load is found to be the main parameter influencing the quenching distance. The analysis of the quenching distances, normalized wall heat fluxes and Peclet numbers reveals that flame-wall interactions in spark-ignition engines exhibit strong similarities to laminar premixed flame-wall interactions. In addition, two correlations for calculating the quenching distance are proposed. These insights provide a deeper understanding of flame-wall interactions in spark-ignition engines and can be used to develop or adapt turbulent combustion models.

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Section: Literature Reviewmentioning

confidence: 99%

Experimental and simulative investigation of flame–wall interactions and quenching in spark-ignition engines

Suckart

Linse

Schutting

et al. 2016

Automot. Engine Technol.

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“…With improvements in computational technology, direct numerical simu-lation (DNS) has become an important tool for investigating flame-wall interactions. Important quantities of flame-wall interaction phenomenon such as maximum wall heat flux and quenching distance have been extensively studied in previous numerical studies [3][4][5][6][7][8]. Interactions of laminar hydrogen premixed flames with walls have been studied in a head-on quenching configuration using a one-dimensional DNS with detailed chemistry in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Owston et al [4] investigated the effects of equivalence ratio and pressure on wall heat flux Φ q , and the results show a significant increase in maximum Φ q when the pressure is doubled. Owston et al [5] have also investigated laminar n-heptane-air flames at different wall temperatures under constant pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

“…This mechanism needs to be understood to lower the heat loss for high-efficiency engines. In this study, due to the enormous computational resources required by DNS, a one-dimensional configuration similar to the previous studies [3][4][5][6][7][8] is employed. Moreover, the compromise made in the numerical configuration is accommodated by employing a more complex chemistry, an isochoric process and relatively high pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

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Flame–wall interactions of lean premixed flames under elevated, rising pressure conditions

Yenerdag

Minamoto

Aoki

et al. 2017

Fuel

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Direct numerical simulation (DNS) of laminar lean methane-air and nheptane-air premixed flames with high exhaust gas recirculation (EGR) ratios propagating towards inert walls in a head-on quenching configuration is conducted to investigate flame-wall interactions at relatively high initial pressure conditions. This study considers the flame propagation under isochoric process after ignition while the piston is at top dead center (TDC). The effects of EGR ratio, equivalence ratio, initial pressure and wall temperature on heat loss and quenching distance are investigated. The results showed that change of EGR ratio in fuel mixture significantly affects the maximum wall heat flux and the heat flux induced by the burned gas temperature. The normalized flame-wall interaction time is not influenced over a range of EGR ratios, equivalence ratios and initial chamber pressures for methane-air and n-heptane-air flames at fixed wall temperature conditions. The dimensional flame-wall interaction time is almost constant when the chamber pressure is

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Unsteady flame–wall interaction: Impact on CO emission and wall heat flux

Palulli

Talei

Gordon

2019

Combustion and Flame

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A numerical study of thermal and chemical effects in interactions of n-heptane flames with a single surface

Cited by 11 publications

References 28 publications

Experimental and simulative investigation of flame–wall interactions and quenching in spark-ignition engines

Experimental and simulative investigation of flame–wall interactions and quenching in spark-ignition engines

Flame–wall interactions of lean premixed flames under elevated, rising pressure conditions

Unsteady flame–wall interaction: Impact on CO emission and wall heat flux

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