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![Laminar flame speed validation for n-dodecane at an equivalence ratio of 0.6–1.5, atmospheric pressure, and unburned fuel temperatures of 403 and 470 K. The experimental data used for comparison were taken from Kumar and Sung [47], Ji et al. [48], and Hui and Sung [49].](publication/356450491/figure/fig2/AS:1099453926768661@1639141651493/Laminar-flame-speed-validation-for-n-dodecane-at-an-equivalence-ratio-of-06-15.jpg)
Laminar flame speed validation for n-dodecane at an equivalence ratio of 0.6–1.5, atmospheric pressure, and unburned fuel temperatures of 403 and 470 K. The experimental data used for comparison were taken from Kumar and Sung [47], Ji et al. [48], and Hui and Sung [49].
Source publication
The natural gas (NG)/diesel dual-fuel engine has attracted extensive attention in recent years, and the influence of ignition delay on the engine is very important. Therefore, the research on the ignition delay of NG/diesel dual fuel is of great significance. In this work, a simplified n-dodecane mechanism was used to study the effect of methane mi...
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There are many applications of premixed burners used for both domestic and industrial purposes. Because of the widespread usage of premixed burner in domestic appliances, it is very important to improve combustion and emission characteristics due to its overall benefits in terms of fuel consumption and emissions. Therefore, this study has aimed to...
Citations
... In addition, three mechanisms from the literature, which are n-dodecane with 65 species and 363 reactions [11,38], n-heptane with 159 species and 770 reactions [3,39], and a diesel fuel surrogate with 163 species and 887 reactions [1], are also studied. ...
Even though there is a pressing interest in clean energy sources, compression ignition (CI) engines, also called diesel engines, will remain of great importance for transportation sectors as well as for power generation in stationary applications in the foreseeable future. In order to promote applications dealing with complex diesel alternative fuels by facilitating their integration in numerical simulation, this paper targets three objectives. First, generate novel diesel fuel surrogates with more than one component. Here, five surrogates are generated using an advanced chemistry solver and are compared against three mechanisms from the literature. Second, validate the suggested reaction mechanisms (RMs) with experimental data. For this purpose, an engine configuration, which features a reacting spray flow evolving in a direct-injection (DI), single-cylinder, and four-stroke motor, is used. The RNG k-Epsilon coupled to power-law combustion models is applied to describe the complex in-cylinder turbulent reacting flow, while the hybrid Eulerian-Lagrangian Kelvin Helmholtz-Rayleigh Taylor (KH-RT) spray model is employed to capture the spray breakup. Third, highlight the impact of these surrogate fuels on the combustion properties along with the exergy of the engine. The results include distribution of temperature, pressure, heat release rate (HRR), vapor penetration length, and exergy efficiency. The effect of the surrogates on pollutant formation (NOX, CO, CO2) is also highlighted. The fifth surrogate showed 47% exergy efficiency. The fourth surrogate agreed well with the maximum experimental pressure, which equaled 85 Mpa. The first, second, and third surrogates registered 400, 316, and 276 g/kg fuel, respectively, of the total CO mass fraction at the outlet. These quantities were relatively higher compared to the fourth and fifth RMs.
div class="section abstract"> This work experimentally investigates the impact of premixed fuel composition (methane/ethane, methane/propane, and methane/hydrogen mixtures having equivalent chemical energy) and pilot reactivity (cetane number) on diesel-pilot injection (DPI) combustion performance and emissions, with an emphasis on the pilot ignition delay (ID). To support the experimental pilot ignition delay trends, an analysis technique known as Mixing Line Concept (MLC) was adopted, where the cold diesel surrogate and hot premixed charge are envisioned to mix in a 0-D constant volume reactor to account for DPI mixture stratification. The results show that the dominant effect on pilot ignition is the pilot fuel cetane number, and that the premixed fuel composition plays a minor role. There is some indication of a physical effect on ignition for cases containing premixed hydrogen. The results also show that the HC and CO emissions for the methane/ethane and methane/propane mixtures decrease despite an increase in the molar carbon content of the fuel with substitution of methane. For the methane/hydrogen mixture, the decrease is caused by both the reduction in carbon content and the improvement in background mixture reactivity.
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