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Research Papers

Numerical Investigation of Combustion and Emission With Different Diesel Surrogate Fuel by Hybrid Breakup Model

[+] Author and Article Information
Wenliang Qi

College of Power and Energy Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: muyiren@hrbeu.edu.cn

Pingjian Ming

College of Power and Energy Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: pingjianming@hrbeu.edu.cn

Ming Jia

School of Energy and Power Engineering,
Dalian University of Technology,
Dalian 116024, China
e-mail: jiaming@dlut.edu.cn

Ye Peng

College of Power and Energy Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: pengye@outlook.com

Chen Liu

College of Power and Energy Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: liuchen_hrbeu@hrbeu.edu.cn

1Corresponding author.

Manuscript received February 16, 2018; final manuscript received August 12, 2018; published online November 20, 2018. Assoc. Editor: David L. S. Hung.

J. Eng. Gas Turbines Power 141(4), 041013 (Nov 20, 2018) (9 pages) Paper No: GTP-18-1070; doi: 10.1115/1.4041283 History: Received February 16, 2018; Revised August 12, 2018

Injection flow dynamics plays a significant role in fuel spray; this process controls the fuel–air mixing, which in turn is critical for the combustion and emissions process in diesel engine. In the current study, an integrated spray, combustion, and emission numerical model is developed for diesel engine computations based on the general transport equation analysis (GTEA) code. The model is first applied to predict the effect of turbulence inside the nozzle, which is considered by the submodel of hybrid breakup model on diesel spray process. The results indicate that turbulence term enhances the rate of breakup, resulting in more new droplets and smaller droplet sizes, leading to high evaporation rate with more evaporated mass. The model is also applied to simulate combustion and soot formation process of diesel. The effects of ambient density, ambient temperature, oxygen concentration and reaction mechanism on ignition delay, flame lift-off length, and soot formation are analyzed and discussed. The results show that although higher ambient density and temperature reduce the ignition delay and cause the flame stabilization location to move upstream, this is not helpful for fuel–air mixing because it increases the soot level in the fuel jet. While higher oxygen concentration has negative effects on soot formation. In addition, the model is employed to simulate the combustion and emission characteristics of a low-temperature combustion engine. The overall agreement between the measurements and predictions of in-cylinder pressure, heat release, and emission characteristics are satisfactory.

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Figures

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Fig. 1

Schematic of GTEA combined with CHEMKIN

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Fig. 2

The computational mesh

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Fig. 3

Effect of different breakup models on vapor penetration

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Fig. 4

Comparisons of two Hybrid breakup models in terms of (a) liquid length and (b) evaporation rate and evaporated mass

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Fig. 5

Comparisons of the ignition delay between experiments [44] and the predictions of the two mechanisms

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Fig. 6

Computed temperature contours of n-decane and diesel surrogate mechanism for Pinj = 138 MPa, Tamb = 1000 K, ρamb = 1000 kg/m3

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Fig. 7

Comparisons of the lift-off length between experiments [41,44] and the predictions of the two mechanisms

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Fig. 8

Time sequence of planar laser-induced incandescence images [42] and predicted soot mass fraction contours for Pinj = 138 MPa, Tamb = 1000 K, ρamb = 1000 kg/m3

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Fig. 9

Comparisons of fvsoot between experiments [42] and predictions for two ambient temperature conditions

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Fig. 10

Comparisons of the soot and lift-off length between the two mechanisms for various ambient conditions

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Fig. 11

Computational mesh

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Fig. 12

Comparison of experimental [50] and modeling results for the pressure and heat release rate (fuel flow rate = 15.06 mg/cyc)

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Fig. 13

Comparisons of emissions of soot, CO, NOx, and HC between the simulations and measurements [50]

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