Estimation of laminar flame speeds using axisymmetric bunsen flames: Molecular transport effects

Mitsopoulos, E. P.; Souflas, Konstantinos; Paterakis, Georgios; Koutmos, P.; Egolfopoulos, Fokion N.

doi:10.1016/j.proci.2022.10.016

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…The promotion effect of DME addition on the LBV of NH 3 /air blends can be ascribed to the chemical effect (decreasing activation energy and increasing active free radicals), the thermal effect (increasing adiabatic flame temperature), and the transport effect (altering transport properties of the fuel blend). − These three effects produced by adding DME can be decoupled with the following simulation approach: , To evaluate the chemical effect of DME, part of N 2 in the NH 3 /DME/air is replaced with CO 2 to equate its T e with that of the pure NH 3 /air flame. The obtained LBV is denoted as S l,c (λ).…”

Section: Resultsmentioning

confidence: 99%

Study on Explosion Characteristics of Ammonia/Dimethyl Ether/Air with Different Mixed Compositions

et al. 2023

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The blend of ammonia (NH3) and dimethyl ether (DME) is a promising renewable and clean fuel. This work studies the basic explosion characteristics of NH3/DME/air with varying equivalence ratios (from 0.6 to 1.8) and DME fractions (from 0.2 to 1). Three essential parameters, i.e., explosion pressure (P max), explosion time (t c), and maximum pressure rise rate ((dP/dt)max), were experimentally obtained, and the heat loss during the explosion was quantitatively analyzed. Besides, the heat release characteristics and critical flame radius of destabilization in the explosion process were analyzed using the detailed NH3/DME reaction mechanism. The results showed that adding DME to the mixture can significantly increase the P max, increase the (dP/dt)max, and shorten the t c. The heat loss during the NH3/DME/air explosion mainly presents a negative correlation with the explosion intensity, as reflected by (dP/dt)max and t c. In addition, at stoichiometric ratios, the elementary reaction R12: H + OH + M = H2O + M contributes most to the total heat release of the NH3/DME/air explosion, while the NH3- or DME-related reactions subdominate the total heat production. Adding DME reduces the critical flame radius, causing the flame to enter an unstable state earlier, which is mainly dominated by the hydrodynamic effect.

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Section: Resultsmentioning

confidence: 99%

Study on Explosion Characteristics of Ammonia/Dimethyl Ether/Air with Different Mixed Compositions

et al. 2023

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“…Establishing a global two-layer radiative transfer model for an axisymmetric and shadow covered protoplanetary disk, Okuzumi S emphasized the axisymmetric characteristics of the protoplanetary disk [11]. Based on the molecular transport effect, Mitsupoulos E P believed that estimating laminar flame velocity using axisymmetric intrinsic flames was a new computational approach [12]. Vaccaro M S studied the mechanical behavior of two-phase elastic axisymmetric nanoplates, and numerically simulated their stress and strain distributions under different conditions, as well as the mechanical properties and size effects of the material [13].…”

Section: Related Workmentioning

confidence: 99%

Complete Edge Smooth Finite Interpolation Method for Limit Upper Limit Analysis of Axisymmetric Structures

2024

jemm

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Axisymmetric structures have applications in various fields such as engineering and architecture. This type of structure exhibits complex stress distribution and failure modes when subjected to ultimate loads, and the importance of the analysis method for its upper limit in the engineering field is self-evident. Its upper limit analysis is mainly used to evaluate the stability and load-bearing capacity of axisymmetric structures under load. The intention of the fully edge smooth finite interpolation method is to improve the accuracy and efficiency of analysis. It improves the interpolation function to maintain smoothness at the boundary, and uses adaptive mesh partitioning and local refinement to make the analysis more accurate and efficient. Therefore, the purpose of this article's in-depth study on the perfect edge smooth finite interpolation method is to introduce smooth functions and finite interpolation techniques, accurately simulate structures, avoid risks, and reduce losses. This article mainly applies numerical simulation and experimental comparison to compare the axisymmetric structures of thick walled cylinders, frustums, and spheres. The ultimate load of each structure is obtained by changing the distortion coefficient and radius ratio. The experimental results show that in cylindrical testing, the performance difference between the two methods is greatest when the radius ratio is 3.5. The error between the perfectly smooth finite interpolation method and the analytical value is smaller, while the direct iteration method has a larger error.

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Equivalence Ratio Gradient Effects on Locally Lean, Stoichiometric and Rich Propane/Air and N-Heptane/Air Turbulent Bluff Body Flames

Mitsopoulos,

Panou,

Manoudakis

et al. 2024

Flow Turbulence Combust

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Estimation of laminar flame speeds using axisymmetric bunsen flames: Molecular transport effects

Cited by 7 publications

References 27 publications

Study on Explosion Characteristics of Ammonia/Dimethyl Ether/Air with Different Mixed Compositions

Study on Explosion Characteristics of Ammonia/Dimethyl Ether/Air with Different Mixed Compositions

Complete Edge Smooth Finite Interpolation Method for Limit Upper Limit Analysis of Axisymmetric Structures

Equivalence Ratio Gradient Effects on Locally Lean, Stoichiometric and Rich Propane/Air and N-Heptane/Air Turbulent Bluff Body Flames

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