Anomalous Group Combustion Phenomena in Di Diesel Engines

Tsai, Hsin-Luen; Chiu, H. H.

doi:10.1615/atomizspr.v15.i4.20

Cited by 2 publications

(1 citation statement)

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“…Zhao et al [12] simulated the effect of gas temperature on droplet combustion, only the effect of gas temperature on the droplet evaporation rate was reported and the comparison was given with the numerical results of other investigators. Chiu et al [13,14] reported an analytical model of droplet-group combustion. Segawa et al [15] studied experimentally the ignition and early combustion behavior of 49 droplets under microgravity condition.…”

Section: Introductionmentioning

confidence: 99%

Studies on the flame structure and drag of a combusting droplet group

Zhou¹,

Li²,

Sun³

2023

Combustion Engines

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Droplet combustion has been studied by experiments and numerical simulation for many years, and most of studies were done about single droplets. As for droplet groups, some theoretical and experimental studies were reported, but less of numerical studies. One of the important characteristics is the drag of combusting droplets, which is closely related to flame structure and is a sub-model in numerical simulation of spray combustion. There are contradictory research results for the drag of combusting droplets. In the present paper, large-eddy simulation (LES) is used to study the flame structure and drag of a combusting ethanol-droplet group. The results show that there are three combustion modes: fully-enveloped flame, partially-enveloped flame and wake flame in a droplet group, leading to the change of the drag with inlet velocities. It is found that the drag of droplets in the group is much smaller than that of a non-combusting particle in isothermal flows

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Section: Introductionmentioning

confidence: 99%

Studies on the flame structure and drag of a combusting droplet group

Zhou¹,

Li²,

Sun³

2023

Combustion Engines

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Validation of a Newly Developed n-Heptane Reduced Chemistry and Its Application to Simulations of Ignition Quality Tester, Diesel, and HCCI Combustion

Tsai

Chen²,

Chin

2014

Journal of Engineering for Gas Turbines and Power

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A skeletal mechanism (144 species) and a corresponding reduced mechanism (62 species) were developed on the basis of the most recent detailed n-heptane mechanism by Lawrence Livermore National Laboratories (LLNL, version 3.1, 2012) (Mehl et al., 2011, “Kinetic Modeling of Gasoline Surrogate Components and Mixtures Under Engine Conditions,” Proc. Combust. Inst., 33, pp. 193–200), in order to assess the mechanism's performance under various practical combustion conditions. These simplified mechanisms were constructed and validated under shock tube conditions. Three-dimensional computational fluid dynamics (3D CFD) simulations with both simplified mechanisms were conducted for the following modeling applications: ignition quality tester (IQT), diesel engine, and homogeneous charge compression ignition (HCCI) engine. In comparison with experimental data, the simulation results were found satisfactory under the diesel condition but inaccurate for both the IQT and HCCI conditions. For HCCI, the intake temperature used in the simulation had to be increased 30 K in order to be consistent with the engine data provided by Guo et al. (2010, “An Experimental and Modeling Study of HCCI Combustion Using n-Heptane,” ASME J. Eng. Gas Turbines Power, 132(2), 022801). Exploration of possible causes is conducted leading to the conclusion that refinement in the mechanism is needed for accurate prediction of combustion under IQT and HCCI conditions.

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Anomalous Group Combustion Phenomena in Di Diesel Engines

Cited by 2 publications

References 0 publications

Studies on the flame structure and drag of a combusting droplet group

Studies on the flame structure and drag of a combusting droplet group

Validation of a Newly Developed n-Heptane Reduced Chemistry and Its Application to Simulations of Ignition Quality Tester, Diesel, and HCCI Combustion

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