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Evaluation of low-temperature diesel combustion regimes with n-Heptane fuel in a constant-volume chamber

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Abstract

The concept of Low Temperature Combustion (LTC) has been advancing rapidly because it may reduce emissions of NOx and soot simultaneously. Various LTC regimes that yield specific emissions have been investigated by a great number of experiments. To accelerate the evaluation of the spray combustion characteristics of LTC, to identify the soot formation threshold in LTC, and to implement the LTC concept in real diesel engines, LTC is modeled and simulated. However, since the physics of LTC is rather complex, it has been a challenge to precisely compute LTC regimes by applying the available diesel combustion models and considering all spatial and temporal characteristics as well as local properties of LTC. In this paper, LTC regimes in a constant-volume chamber with n-Heptane fuel were simulated using the ECFM3Z model implemented in a commercial STAR-CD code. The simulations were performed for different ambient gas O2 concentrations, ambient gas temperatures and injection pressures. The simulation results showed very good agreement with available experimental data, including similar trends in autoignition and flame evolution. In the selected range of ambient temperatures and O2 concentrations, soot and NOx emissions were simultaneously reduced.

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Authors and Affiliations

  1. Department of Mechanical Design Engineering, Chonnam National University, Cheonnam, 550-749, Korea

    U. B. Azimov & K. S. Kim

  2. Korea Institute of Machinery and Materials, Eco-Machinery Research Division, 171 Jang-dong, Yuseong-gu, Daejeon, 305-343, Korea

    D. S. Jeong & Y. G. Lee

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  1. U. B. Azimov
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  2. K. S. Kim
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  3. D. S. Jeong
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  4. Y. G. Lee
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Correspondence to K. S. Kim.

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Azimov, U.B., Kim, K.S., Jeong, D.S. et al. Evaluation of low-temperature diesel combustion regimes with n-Heptane fuel in a constant-volume chamber. Int.J Automot. Technol. 10, 265–276 (2009). https://doi.org/10.1007/s12239-009-0031-3

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  • DOI: https://doi.org/10.1007/s12239-009-0031-3

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