Simulation study on spray combustion mechanism of diesel–gasoline blend fuels

Wu, Zhijun; Bao, Tangtang; Zhang, Qing; Deng, Jun; Li, Liguang

doi:10.1016/j.fuel.2014.11.055

Cited by 11 publications

(3 citation statements)

References 20 publications

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“…The lifted flame of a jet gasoline–diesel blend fuel was analyzed, and the “simultaneous autoignition temperature” concept was proposed . A related simulation coupling the eddy dissipation concept (EDC) model and a simplified reaction mechanism had good agreement with the previous experiment . However, more efforts should be invested to the study of liquid lifted flames, especially for the mechanisms of ignition delay control and flame stabilization.…”

Section: Introductionmentioning

confidence: 99%

“…27 A related simulation coupling the eddy dissipation concept (EDC) model and a simplified reaction mechanism had good agreement with the previous experiment. 28 However, more efforts should be invested to the study of liquid lifted flames, especially for the mechanisms of ignition delay control and flame stabilization. Furthermore, previous studies were mainly based on different boundaries of combustion; 27,28 this study draws comparisons of ignition delays and lift-off heights based on physical properties of fuels other than boundaries of combustion.…”

Section: Introductionmentioning

confidence: 99%

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Autoignition and Stabilization of Diesel–Propane Lifted Flames Issuing into a Hot Vitiated Co-flow

Zhang

et al. 2016

Energy Fuels

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Turbulent lifted flames of diesel–propane blend fuels issuing into a vitiated co-flow are recorded with a high-speed camera. The spray characteristics, flame structures, ignition delays, and lift-off heights of jet flames of diesel–propane blend fuels are analyzed in this research. As an additive to diesel fuel, propane has little influence on the autoignition process of diesel from the perspective of chemical kinetics but it improves the atomization, evaporation, and turbulence of the fuel spray. The addition of propane is beneficial for studying the interaction of the chemical kinetics and fluid dynamics in turbulent lifted flames. The experimental results show that the propane fraction has different influences on the ignition delay in two temperature ranges. The ignition delay increases with the increase of the fraction of propane when the co-flow temperature is lower than 1080 K and decreases when the co-flow temperature is higher than 1117 K. Thus, a related mechanism controlling the ignition delay of the blends is proposed by combining the physical preparation process and chemical preparation process. A zero-dimensional model based on chemical kinetics supports this conclusion. For flame stabilization, a higher fraction of propane results in a higher lift-off height in the temperature range of 1043–1098 K, a lower lift-off height in the temperature range of 1117–1155 K, and a higher lift-off height in the temperature range of 1175–1194 K. A mechanism for stabilizing lifted flames from liquid blend fuels is proposed from the perspective of autoignition and turbulence.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Autoignition and Stabilization of Diesel–Propane Lifted Flames Issuing into a Hot Vitiated Co-flow

Zhang

et al. 2016

Energy Fuels

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“…Other important properties are the chemical composition of the fuel, directly affecting the diffusion of fuel molecules after evaporation and the chemical kinetics of the combustion [31], and the heating value, possibly reducing the flame temperature [32]. In simulations of a dual blend of iso-octane and n-heptane, Wu et al [33] showed that at high co-flow temperature, a difference in time of ignition occurs, with iso-octane igniting before n-heptane, mainly determined by different vaporisation and diffusion rates. At low co-flow temperatures, the opposite was observed, with ignition of n-heptane occurring before iso-octane, due to a slower vaporisation and lower activation energy required for the initial deactivation reaction.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Optimization of a Small Diesel Burner for Mobile Applications

et al. 2018

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While extensive research has been done on improving diesel engines, much less has been done on auxiliary heaters, which have their own design challenges. The study analyzes how to optimize the combustion performance of an auxiliary heater, a 6 kW diesel burner, by investigating key parameters affecting diesel combustion and their properties. A model of a small diesel heater, including a simulation of fuel injection and combustion process, was developed step-wise and verified against experimental results that can be used for scaling up to 25 kW heaters. The model was successfully applied to the burner, predicting the burner performance in comparison with experimental results. Three main variables were identified as important for the design. First, it was concluded that the distance from the ring cone to the nozzle is essential for the fluid dynamics and flame location, and that the ring cone should be moved closer to the nozzle for optimal performance. Second, the design of the swirl co-flow is important, and the swirl number of the inlet air should be kept above 0.6 to stabilize the flame location for the present burner design. Finally, the importance of the nozzle diameter to avoid divergent particle vaporization was pointed out.

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Influences of different fuel kinds and engine design parameters on the performance characteristics and NO formation of a spark ignition (SI) engine

Gonca

2017

Applied Thermal Engineering

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Simulation study on spray combustion mechanism of diesel–gasoline blend fuels

Cited by 11 publications

References 20 publications

Autoignition and Stabilization of Diesel–Propane Lifted Flames Issuing into a Hot Vitiated Co-flow

Autoignition and Stabilization of Diesel–Propane Lifted Flames Issuing into a Hot Vitiated Co-flow

Modelling and Optimization of a Small Diesel Burner for Mobile Applications

Influences of different fuel kinds and engine design parameters on the performance characteristics and NO formation of a spark ignition (SI) engine

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