Unsteady heat transfer during the turbulent combustion of a lean premixed methane–air flame: Effect of pressure and gas dynamics

Boust, Bastien; Sotton, Julien; Bellenoue, Marc

doi:10.1016/j.proci.2006.07.176

Cited by 25 publications

(5 citation statements)

References 4 publications

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“…It is worth deducing that the variation of Pint is synonymous with the variation of flame power (Q ∑ ) for a fuel-air mixture (constant Ф) as 𝑸 ∑ is only a function of Pint. Going to the second incremental study of the effect of turbulence on QP, there has been only a few reported works (GRUBER et al 2010;Poinsot et al 1993;Bruneaux et al 1996;Boust et al 2007b). Although turbulence is shown (through DNS studies in a channel flow) to affect the heat flux to the wall during FWI, no such effects have been reported in closed chamber combustion (Bruneaux et al 1996).…”

Section: Introductionmentioning

confidence: 99%

“…Although turbulence is shown (through DNS studies in a channel flow) to affect the heat flux to the wall during FWI, no such effects have been reported in closed chamber combustion (Bruneaux et al 1996). Attempts at separating the influence of turbulence on QP in a closed chamber did not yield conclusive results as increase in turbulence intensity correlated with the increase in mean velocity (Boust 2006;Boust et al 2007b;Sotton 2003). To understand the FWI in a practical combustion application like engines it is vital to understand the independent effect of the turbulence intensity.…”

Section: Introductionmentioning

confidence: 99%

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Effect of pressure and turbulence intensity on the heat flux during flame wall interaction (FWI)

Padhiary

Pilla

Sotton

et al. 2023

Preprint

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Combustion applications such as IC engines are a major source of power generation. Renewable alternative fuels like hydrogen, ammonia and efuels promise potential of combustion in future power applications. Most power applications encounter flame wall interaction (FWI) during which high heat losses occur. Investigating heat loss during FWI has potential to identify parameters that could lead to decreasing heat losses and possibly increasing the efficiency of combustion applications. In this work, study of FWI in a constant volume chamber (CVC) at high pressure in both laminar and turbulent conditions is presented. High speed surface temperature measurement using thin junction thermocouples coupled with high-speed flow field characterization using particle image velocimetry (PIV) are used simultaneously to investigate the effect of pressure during FWI (Pint) and turbulence intensity (q) on the heat flux peak (QP). In laminar combustion regimes it is found that QP is proportional to Pint0.35. The increase in q is shown to affect both Pint and QP. Finally, comparing QP vs Pint for both laminar and turbulent combustion regimes, it is found that increase in q leads to increase in QP which is highly pronounced at high Pint.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of pressure and turbulence intensity on the heat flux during flame wall interaction (FWI)

Padhiary

Pilla

Sotton

et al. 2023

Preprint

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“…In order to replicate combustion in engine conditions, multiple configurations have been used: constant volume combustion chamber (CVCC), 6 rapid compression machine (RCM) 7 or instrumented IC engines. 8 CVCC and RCM enable easy sensor access to the combustion chamber while maintaining conditions similar to IC engines.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies on premixed flames for spark-ignition (SI) engines show the main features of transient heat flux curves. 6,7,21,22 The heat flux first increases in a fraction of millisecond from zero to a few MW/m 2 and decreases in about the same time. That heat flux spike is attributed to flame wall interaction (FWI) processes: the hot flame front, close to the adiabatic flame temperature, approaches the wall until heat losses cause flame quenching.…”

Section: Introductionmentioning

confidence: 99%

High-frequency wall heat flux measurement during wall impingement of a diffusion flame

Moussou

Pilla

Sotton

et al. 2019

International Journal of Engine Research

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The efficiency of internal combustion engines is limited by heat losses to the wall of the combustion chamber. A precise characterization of wall heat flux is therefore needed to optimize engine parameters. However, the existing measurements of wall heat fluxes have significant limitations; time resolution is often higher than the timescales of the physical phenomena of flame–wall interaction. Furthermore, few studies have investigated diesel flame conditions (as opposed to propagation flames). In this study, the heat flux generated by a diffusion flame impinging on a wall was measured with thin-junction thermocouple, with a time resolution of the whole acquisition chain better than 0.1 ms. The effects of variations in ambient gas temperature, injection pressure and injector–wall distance were investigated. Diesel spray impingement on the wall is shown to cause strong gas–wall thermal exchange, with convection coefficients of 6–12 kW/m2/K. Those results suggest the necessity of close-wall aerodynamic measurements to link macroscopic characteristics of the spray (injection pressure, impingement geometry) to turbulence values.

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“…틈새에서 발생하는 가스 난류의 열전달계수는 부 드러운 것보다 거친 것이 약간 더 높고, 열전달에서 거 칠음의 효과는 실제 사용 시 무시할 수 있으며 [6], 틈새 내부에서 외부로 방출 될 때의 단열 팽창 효과는 냉각 에 큰 영향을 미치지 않는다 [7].…”

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A Study on the MESG of Flammable Ternary Gas Mixtures

Hwang¹,

Byeon²,

Rhee³

et al. 2016

Journal of the Korean Institute of Gas

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-Electrical apparatuses for use in the presence of flammable gas atmospheres have to be specially designed to prevent them from igniting the explosive gas. Flameproof design implies that electrical components producing electrical sparks are contained in enclosures and withstand the maximum pressure of internal gas or vapours. In addition, any gaps in the enclosure wall have to designed in such a way that they will not transmit a gas explosion inside the enclosure to an explosive gas or vapours atmosphere outside it. In this study, we explained some of the most important physical mechanism of MESG(Maximum Experimental Safe Gap) that the jet of combustion products ejected through the flame gap to the external surroundings do not have an energy and temperature large enough to initiate an ignition of external gas or vapours. We measured the MESG and maximum explosion pressure of ternary gas mixtures(propane-acetylene-air) by the test method and procedure of IEC 60079-20-1:2010. As a result, the composition of propane gas that has lower explosive power than acetylene gas in the ternary gas mixtures makes greater effects on MESG and explosion pressure.

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Unsteady heat transfer during the turbulent combustion of a lean premixed methane–air flame: Effect of pressure and gas dynamics

Cited by 25 publications

References 4 publications

Effect of pressure and turbulence intensity on the heat flux during flame wall interaction (FWI)

Effect of pressure and turbulence intensity on the heat flux during flame wall interaction (FWI)

High-frequency wall heat flux measurement during wall impingement of a diffusion flame

A Study on the MESG of Flammable Ternary Gas Mixtures

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