Mechanism Reduction and Bunsen Burner Flame Verification of Methane

Abstract

Based on directed relation graph with error propagation methods, 39 species and 231 reactions skeletal mechanism were obtained from Mech_56.54 (113 species and 710 reactions) mechanism of methane. The ignition delay times, laminar flame propagation speed, and important species were calculated using the simplified mechanism at different pressures and equivalence ratios. The simulation results were in good agreement with that of detailed mechanisms and experimental data. The numerical simulation of the Bunsen burner jet flame was carried out using the simplified methane mechanism, and the simulation results well reproduced the temperature, flow fields and distribution of important species at flame zone. The compact methane reduced mechanism can not only correctly respond to its dynamic characteristics, but also can be well used for numerical simulation, which is of great significance in engineering applications.

Numerical Study on the Dynamic Response of Gas Explosion in Uneven Coal Mine Tunnels Using CESE Reaction Dynamics Model

“…Therefore, the simplified 18-step and 53-step methane combustion models based on GRI-Mech 3.0 were adopted [36], and these models will be verified in subsequent studies to select the best methane combustion reaction mechanism suitable for simulation analysis. Among them, the 18 step basic reaction mechanism extracted the skeleton reaction of complex methane combustion mechanism, which has high prediction accuracy for methane combustion, as follows [36][37][38]:…”

Textdaten

“…Der Ausgangspunkt des rationalen Wählers nach Downs22, der unter der Rationalitäts annahme und der Annahme vollständiger Information, eine seinen Nutzen maximierende Entscheidung trifft, führt im eindimensionalen Raum zur Konvergenz politischer Parteien.23 Die diesem Modell zugrundeliegenden Annahmen von Invarianz, Vollständigkeit aller Informationen, Eindimensionalität des Politikraums und dem Eigennutzaxiom wurden im Laufe der Zeit stark kritisiert. 24 Kahneman und Tversky/Kahneman zeigen, dass Framing von identischen Informationen, also die Kontextualisierung, die Entscheidungen von Agent:innen beeinflusst.25 Bezogen auf den rationalen Wähler können die strengen Rationalitätsannahmen widerlegt werden. Menschen unterliegen kognitiven Verzerrungen, die ihre Entscheidungsfindung unbewusst beeinflussen.…”

On the Importance of Model Selection for CFD Analysis of High Temperature Gas-Solid Reactive Flow; Case Study: Post Combustion Chamber of HIsarna Off-Gas System

“…The mechanism contains 55 species and 325 reaction which have been incorporated in CFD models to study CO-H 2 mixture (without CH 4 content) [24,25] and NOx formation [26][27][28][29][30][31]. To enhance the simulation speed, most of the researchers have used reduced GRI mechanisms where some species and therefore reactions are eliminated depending on the specific reactive flow conditions [32][33][34][35][36]. One reduced form of GRI mechanism is known as GRI 1.2 which contains 30 species and 177 reaction which will be used for comparison in this study.…”