Increasingly stringent fuel economy and CO2 emission regulations provide a strong impetus for development of high-efficiency engine technologies. Diesel engines dominate the heavy duty market and significant segments of the global light duty market due to their intrinsically higher thermal efficiency compared to spark-ignited (SI) engine counterparts. Predictive simulation tools can significantly reduce the time and cost associated with optimization of engine injection strategies, and enable investigation over a broad operating space unconstrained by availability of prototype hardware. In comparison with 0D/1D and 3D simulations, Quasi-Dimensional (quasi-D) models offer a balance between predictiveness and computational effort, thus making them very suitable for enhancing the fidelity of engine system simulation tools. A most widely used approach for diesel engine applications is a multizone spray and combustion model pioneered by Hiroyasu and his group. It divides diesel spray into packets and tracks fuel evaporation, air entrainment, gas properties, and ignition delay (induction time) individually during the injection and combustion event. However, original submodels are not well suited for modern diesel engines, and the main objective of this work is to develop a multizonal simulation capable of capturing the impact of high-injection pressures and exhaust gas recirculation (EGR). In particular, a new spray tip penetration submodel is developed based on measurements obtained in a high-pressure, high-temperature constant volume combustion vessel for pressures as high as 1450 bar. Next, ignition delay correlation is modified to capture the effect of reduced oxygen concentration in engines with EGR, and an algorithm considering the chemical reaction rate of hydrocarbon–oxygen mixture improves prediction of the heat release rates. Spray and combustion predictions were validated with experiments on a single-cylinder diesel engine with common rail fuel injection, charge boosting, and EGR.
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November 2017
Research-Article
Quasi-Dimensional Diesel Engine Combustion Modeling With Improved Diesel Spray Tip Penetration, Ignition Delay, and Heat Release Submodels
Shuonan Xu,
Shuonan Xu
Automotive Engineering Department,
Clemson University,
Greenville, SC 29607
Clemson University,
Greenville, SC 29607
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Hirotaka Yamakawa,
Hirotaka Yamakawa
Mechanical Engineering Department,
Hiroshima University,
Hiroshima 739-0046, Japan
Hiroshima University,
Hiroshima 739-0046, Japan
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Keiya Nishida,
Keiya Nishida
Mechanical Engineering Department,
Hiroshima University,
Hiroshima 739-0046, Japan
Hiroshima University,
Hiroshima 739-0046, Japan
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Zoran Filipi
Zoran Filipi
Automotive Engineering Department,
Clemson University,
Greenville, SC 29607
Clemson University,
Greenville, SC 29607
Search for other works by this author on:
Shuonan Xu
Automotive Engineering Department,
Clemson University,
Greenville, SC 29607
Clemson University,
Greenville, SC 29607
Hirotaka Yamakawa
Mechanical Engineering Department,
Hiroshima University,
Hiroshima 739-0046, Japan
Hiroshima University,
Hiroshima 739-0046, Japan
Keiya Nishida
Mechanical Engineering Department,
Hiroshima University,
Hiroshima 739-0046, Japan
Hiroshima University,
Hiroshima 739-0046, Japan
Zoran Filipi
Automotive Engineering Department,
Clemson University,
Greenville, SC 29607
Clemson University,
Greenville, SC 29607
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 15, 2017; final manuscript received March 15, 2017; published online June 6, 2017. Editor: David Wisler.
J. Eng. Gas Turbines Power. Nov 2017, 139(11): 112802 (17 pages)
Published Online: June 6, 2017
Article history
Received:
February 15, 2017
Revised:
March 15, 2017
Citation
Xu, S., Yamakawa, H., Nishida, K., and Filipi, Z. (June 6, 2017). "Quasi-Dimensional Diesel Engine Combustion Modeling With Improved Diesel Spray Tip Penetration, Ignition Delay, and Heat Release Submodels." ASME. J. Eng. Gas Turbines Power. November 2017; 139(11): 112802. https://doi.org/10.1115/1.4036575
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