Impact of Fuel Properties on Diesel Low Temperature Combustion

Ojeda, William De; Bulicz, Tytus; Han, Xiaoye; Zheng, Ming; Cornforth, Frederick

doi:10.4271/2011-01-0329

Cited by 49 publications

(41 citation statements)

References 20 publications

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“…premixed low temperature combustion (LTC) have been extensively studied, accomplishing simultaneous reduction in NOx and soot emissions with deteriorated thermal efficiency [1,2]. Fuel properties are crucial for the combustion process and emissions formation in the advanced engine combustion strategies [3,4]. The optimized fuel properties are proved to promote uniform mixture formation, which could restrict the in-cylinder soot-favorable region and avoid heavy usage of exhaust gas recirculation, as employed in the conventional LTC mode, to reduce combustion temperature below the soot formation threshold.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the two stage injection of diesel and gasoline blends on a common rail injection system

Han

Duan

Chun-hai

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Experimental study on the two stage injection of diesel and gasoline blends on a common rail injection system

Han

Duan

Chun-hai

et al. 2015

Fuel

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“…The LTC modes including homogenous charge compression ignition (HCCI) achieve enhanced homogeneity of the cylinder charge using complex con trol techniques that modulate parameters including intake boost, exhaust gas recirculation (EGR), and fuel injection metering and scheduling [5,6,8], The possibility and advantages of switching between various LTC modes at different loads has also been pro posed as a solution to cater for the wide load ranges of automotive engines [9]. Furthermore, the use of a second fuel, typically alco hol, has also been investigated for high load LTC operation ' [7,10,11]. Therefore, fuel injection parameters and intake charge attributes may be identified as two major control inputs for ena bling LTC modes in diesel engines and for switching between the modes.…”

Section: Introductionmentioning

confidence: 99%

“…The traditionally high NOx and soot emissions of the diesel engine have driven major hardware improvements, including mul tistage turbocharging, multiloop exhaust gas recirculation, com mon rail injection systems, and variable valve timing, among others [1,2]. Numerous advances in engine control systems have also been researched and implemented subsequently [3].Current research in diesel engines includes alternate combustion regimes that improve the homogeneity (mixing) of the cylinder charge and reduce the combustion temperature, resulting in simultaneous reduction of the NOx and soot emissions [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Study of Cylinder Charge Control for Enabling Low Temperature Combustion in Diesel Engines

Divekar

Asad

Han

et al. 2014

Journal of Engineering for Gas Turbines and Power

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Suitable cylinder charge preparation is deemed critical for the attainment of a highly ho mogeneous, diluted, and lean cylinder charge, which is shown to lower the flame temper ature. The resultant low temperature combustion (LTC) can simultaneously reduce the NOx and soot emissions from diesel engines. This requires sophisticated coordination of multiple control systems for controlling the intake boost, exhaust gas recirculation (EGR), and fueling events. Additionally, the cylinder charge modulation becomes more complicated in the novel combustion concepts that apply port injection of low reactivity alcohol fuels to replace the diesel fuel partially or entirely. In this work, experiments have been conducted on a single cylinder research engine with diesel and ethanol fuels. The test platform is capable of independently controlling the intake boost, EGR rates, and fueling events. Effects of these control variables are evaluated with diesel direct injection and a combination of diesel direct injection and ethanol port injection. Data analyses are performed to establish the control requirements for stable operation at dif ferent engine load levels with the use of one or two fuels. The sensitivity of the combus tion modes is thereby analyzed with regard to the boost, EGR, fuel types, and fueling strategies. Zero-dimensional cycle simulations have been conducted in parallel with the experiments to evaluate the operating requirements and operation zones of the LTC com bustion modes. Correlations are generated between air-fuel ratio (A), EGR rate, boost level, in-cylinder oxygen concentration, and load level using the experimental data and simulation results. Development of a real-time boost-EGR set-point determination to sus tain the LTC mode at the varying engine load levels and fueling strategies is proposed.

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“…Since NOx can be controlled by EGR rate and combustion phasing [16][17][18], taking measures to reduce the increased soot (when EGR rate is increased to reduce NOx) is a viable strategy to improve the soot/NOx trade-off.…”

Section: Introductionmentioning

confidence: 99%

Defeat of the Soot/NOx Trade-off Using Biodiesel-Ethanol in a Moderate Exhaust Gas Recirculation Premixed Low-Temperature Combustion Mode

Zhu

Bohac²,

Huang

et al. 2013

Journal of Engineering for Gas Turbines and Power

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The soot/nitric oxides (NOJ trade-off of diesel, biodiesel, and biodiesel-ethanol in a moderate exhaust gas recirculation (EGR) premixed low temperature combustion (LTC) mode is investigated in this study. Compared to diesel, biodiesel demonstrates poorer spray behavior and shorter ignition delay, but its oxygen content results in less soot. Blending ethanol into biodiesel enhances spray behavior, prolongs ignition delay, and further increases fuel oxygen fraction, resulting in a larger reduction in soot. In the moderate EGR premixed low temperature combustion mode, an obvious soot/NO^. trade-off is demonstrated with diesel fuel. The soot/NO^ trade-off is improved by biodiesel fuel and defeated by the biodiesel-ethanol blend. Low soot, low NO^, and high combustion efficiency are achieved with the biodiesel-ethanol blend and proper EGR rate.

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Impact of Fuel Properties on Diesel Low Temperature Combustion

Cited by 49 publications

References 20 publications

Experimental study on the two stage injection of diesel and gasoline blends on a common rail injection system

Experimental study on the two stage injection of diesel and gasoline blends on a common rail injection system

Study of Cylinder Charge Control for Enabling Low Temperature Combustion in Diesel Engines

Defeat of the Soot/NOx Trade-off Using Biodiesel-Ethanol in a Moderate Exhaust Gas Recirculation Premixed Low-Temperature Combustion Mode

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