Accurate analytical models for fractional pressure rise in constant volume combustion

Luijten, Ccm Carlo; Doosje, E Erik; Goey, de Lph Philip

doi:10.1016/j.ijthermalsci.2008.12.020

Cited by 52 publications

(30 citation statements)

References 24 publications

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“…(2). This observation can be attributed to an underestimation of entropy production by the linear model, as we have extensively argued in a recent paper [15]. For this reason, Eq.…”

Section: Analytical Two-zone Modelmentioning

confidence: 74%

Impact of dissociation and end pressure on determination of laminar burning velocities in constant volume combustion

Luijten¹,

Doosje²,

Oijen³

et al. 2009

International Journal of Thermal Sciences

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“…(2). This observation can be attributed to an underestimation of entropy production by the linear model, as we have extensively argued in a recent paper [15]. For this reason, Eq.…”

Section: Analytical Two-zone Modelmentioning

confidence: 74%

Impact of dissociation and end pressure on determination of laminar burning velocities in constant volume combustion

Luijten¹,

Doosje²,

Oijen³

et al. 2009

International Journal of Thermal Sciences

Self Cite

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“…Luijten et al (2009) (19) and (20) of Luijten et al (2009). By rearranging terms, equation (5.6) can be placed into the form…”

Section: Discussionmentioning

confidence: 99%

Pressure rise generated by the expansion of a local gas volume in a closed vessel

et al. 2009

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Experiments were conducted to determine the pressure rise that results from either the combustion of a localized gas volume or the expansion of a pressurized gas volume adjacent to an inert gas in a closed vessel. The experiments consisted of either pressurized air or the combustion of stoichiometric and fuel-lean hydrogen-air mixtures compressing an inert gas. The pressure rise in the inert gas was measured as a function of either the volume fraction or the initial pressure of the expanding gas. Helium, nitrogen, air and carbon dioxide were tested to explore the effect of inert gas heat capacity on the pressure rise. The final pressure of the inert gas increased with the volume fraction and initial pressure of the expanding gas, and was influenced to a lesser extent by the heat capacity of the inert gas. A model was assessed using the experimental data, and the theoretical results were consistent with the observed trends. This model and other published models were assessed and compared using prior data for localized gas combustion surrounded by an inert gas and the partial combustion of homogeneous methane-air mixtures.

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“…[17] To take the effect of af inite flame thickness into account, ac orrection factor e has been introduced to calculate s …”

Section: Effect Of Zero Flame Thickness Assumptionmentioning

confidence: 99%

“…[14,15] Despite these benefits,a nu nsteadily movingf lame front has to be trackedo ptically or the transient pressure increaseh as to be recorded, both of which require an umbero fa ssumptionsu ponp ostprocessing of the measured data to deduce the flame speed. [16,17] Fore xample, the flame front is often assumed to have ap erfect spherical shape and the changei nt hermodynamic state,t hat is,i ncrease in pressure and temperatured uring flame propagation, is neglected.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Infinite Thin Flame Approach on the Evaluation of Flame Speed using Spherically Expanding Flames

et al. 2017

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Combustion is an important part of most current and future overall energy‐conversion systems, especially if using renewable fuels in energy‐storage concepts. Therefore, the laminar flame speed, which is a key parameter for the design of combustion systems, needs to be known for a growing multitude of different thermodynamic conditions and fuels. The spherically expanding flame method is one of the few techniques that enables the flame speed to be measured under particular conditions such as elevated pressure and temperature as well as under turbulent conditions, which are important for energy‐conversion applications. The radius of a spherically propagating flame is tracked and used for evaluation of the flame speed. Usually, the flame is assumed to be infinitely thin. To assess the influence of this assumption, direct numerical simulations were conducted for the experimental setup and compared with measurements and correlations from the literature. The flame speed determined by the consumption rate of fuel, which takes a finite thickness of the flame into account, was found to be always larger than the flame speed computed by assuming an infinitely thin flame. The difference between these flame speeds was observed to be as large as approximately 10–20 % in the evaluation range of the measured flame radii, which decreases with growing flame radius. This gives rise to the discrepancies in the flame speeds obtained from different measurement methods. An analytical estimation for this difference was developed as a function of the flame radius, which showed quantitatively good agreement with the simulation results and may be used for experimental validations of the flame speed. Both premixed H2/air and CH4/air flames with equivalence ratios ranging from lean to rich conditions were studied.

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Accurate analytical models for fractional pressure rise in constant volume combustion

Cited by 52 publications

References 24 publications

Impact of dissociation and end pressure on determination of laminar burning velocities in constant volume combustion

Impact of dissociation and end pressure on determination of laminar burning velocities in constant volume combustion

Pressure rise generated by the expansion of a local gas volume in a closed vessel

Impact of Infinite Thin Flame Approach on the Evaluation of Flame Speed using Spherically Expanding Flames

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