Experimental study on combustion and emission of an SI engine with natural gas/ethanol combined injection

Zhao, Zhe; Huang, Yan; Yu, Xiumin; Guo, Zezhou; Yu, Longlong; Meng, Shuxuan; Li, Decheng

doi:10.1016/j.fuel.2022.123476

Cited by 11 publications

(4 citation statements)

References 44 publications

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“…One popular strategy to manipulate combustion characteristics [35] and emissions is the blending of oxygenated fuels [36] with diesel. The research landscape in this domain is extensive and complex [37], with multiple studies delving into various aspects of this approach. For example, Sun [38] conducted a meticulous exploration into the influence of pre-injection and post-injection on the NO x emissions of bio-diesel engines by leveraging the synergy of experimentation and simulation.…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis on Combustion Control of Diesel Engines Fueled with Ester Alcohol Diesel

Zhou,

Zhang,

et al. 2023

Energies

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As the urgency for environmental sustainability escalates globally, the exploration of alternative fuels for diesel engines becomes a crucial endeavor. By combining chemical reaction kinetics and three-dimensional simulation software, the combustion and emission characteristics of a diesel engine fueled with two oxygenated fuels, hydrogenated biodiesel and ethanol, and adopting a multi-stage injection strategy were studied. The combustion mechanism of hydrogenated biodiesel ethanol diesel hybrid fuel was established, and the reaction activity of ester alcohol diesel with different mixing ratios was studied through reaction flow analysis at high and low OH temperatures. The established mechanism was coupled with CFD 2021 three-dimensional simulation software to compare the combustion and emission performance of diesel engines fueled with different ratios of ester alcohol diesel. The results show that as the proportion of ester alcohol mixture increases, at low temperatures, the OH generation rate decreases, the consumption rate increases, and the reaction activity decreases, which is not conducive to the promotion of combustion reaction; at high temperatures, the generation rate of OH increases, the consumption rate decreases, and the reaction activity increases, which is conducive to the promotion of combustion reactions. Compared to diesel, the reaction system activity of mixed fuel is enhanced, and the main peak values of cylinder pressure and instantaneous heat release rate are higher than that of diesel. The diffusion of oil and gas in the cylinder is improved. As the proportion of ester alcohol diesel mixture increases, the oxygen content increases, nitrogen oxides emissions increase compared to diesel, and soot emissions decrease compared to diesel. Soot emissions are mainly distributed in areas with a high equivalence ratio and high temperature, which is consistent with the distribution area of C2H2, the precursor of soot generation.

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Section: Introductionmentioning

confidence: 99%

Computational Analysis on Combustion Control of Diesel Engines Fueled with Ester Alcohol Diesel

Zhou,

Zhang,

et al. 2023

Energies

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“…The optimal DIT of a CDI+EPI engine is 150 °CA BTDC. 42 However, with the increasingly stringent requirements of emission regulations, the pollutant emissions (CO, HC, and NOx) of the CDI+EPI engine can be further reduced. On the basis of previous studies, this paper continues to study the variation of combustion and emission characteristics of a CDI+EPI engine with the increase of the CDIr under the same DIP, speed, load, and DIT conditions when λ = 0.9, 1, 1.1, 1.2, 1.3, and 1.4.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, we have studied the combustion and emission characteristics of CDI plus EPI (CDI+EPI) engines with the increase of the CDI ratio (CDIr) when the DIT was between 120 and 180 °CA BTDC under the same conditions of DIP, speed, load, and λ. The optimal DIT of a CDI+EPI engine is 150 °CA BTDC . However, with the increasingly stringent requirements of emission regulations, the pollutant emissions (CO, HC, and NOx) of the CDI+EPI engine can be further reduced.…”

Section: Introductionmentioning

confidence: 99%

Study on Combustion and Emissions of a Combined Injection Spark Ignition Engine with Natural Gas Direct Injection Plus Ethanol Port Injection under Lean-Burn Conditions

Zhao

Huang

et al. 2022

ACS Omega

Self Cite

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Conventional ethanol spark ignition (SI) engines have poor fuel atomization and mixture formation. The objective of this paper is to improve the combustion and emission performance of ethanol SI engines under lean-burn conditions through the dual-injection mode with ethanol port injection and compressed natural gas (CNG) direct injection (CDI+EPI). This paper studies the engine performance at 1500 rpm under five CNG direct injection ratios (CDIr) and five excess air ratios (λ). The results show that as the CDIr increases under lean-burn conditions, the following occurs: the minimum advance for best torque (MBT), the coefficient of variation (CoV IMEP ), and CO and HC emissions decrease; the crankshaft rotation or time with cumulative heat release rate ranging from 10% to 90% (CA 10–90) and NOx emissions first decrease and then increase; and torque, peak in-cylinder pressure (Pmax), and the λ limit first increase and then decrease. The larger the CDIr is, the less influence λ has on the MBT. When CDIr = 15%, the CoV IMEP can be effectively reduced, the engine can still work stably in all lean-burn conditions, and the λ limit will reach the maximum value of 1.73, 19.31% higher than that of the original engine (CDIr = 0). When λ = 1.1, CO emissions decrease the most and HC emissions decrease the least. At this time, CO and HC emissions decrease by 1.56 vol % and 30 ppm, respectively, on average for every 0.1 decrease in λ. For CA 10–90, torque, and Pmax, λ = 1.1, 15% CDI, and 85% EPI is the optimal combination under lean-burn conditions. When CDIr ≥ 15%, NOx emissions are at an ideal level. Under lean-burn conditions, direct-injection CNG can form a good stratified natural gas/ethanol mixture in the cylinder, effectively improving the engine’s power and stability and reducing emissions. The λ = 1.1, 15% CDI, 85% EPI combination provides a cutting-edge and outstanding solution for a natural gas/ethanol combined injection SI engine.

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“…The worldwide voice of cutting down the release of greenhouse gases is pushing the stringent regulation of CO 2 emissions and the development of alternative fuel [1][2][3][4][5][6][7][8][9][10][11] internal combustion engine technologies. Natural gas has been widely used as an alternative fuel for internal combustion engines for decades, and the number of natural gas engine owners is growing rapidly in recent years.…”

Section: Introductionmentioning

confidence: 99%

Effects of excess air ratio and spark timing on performance and gaseous pollutant emissions of fuel reforming natural gas engine

Zheng

Zhou

Zheng

et al. 2022

International Journal of Engine Research

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The combustion and emission characteristics as well as the economic performance of partial oxidation fuel reforming (POFR) natural gas engines were investigated by adjusting the fuel reforming ratios and the engine load. The performance of the POFR engine with a 12% fuel reforming ratio was compared with that of the original engine. The results showed that the fuel-partial-reforming was effective in reducing the cycle-to-cycle variations over the whole range of the operating conditions. The THC and NOX emissions decreased at almost all operating conditions, but showed different decreasing trends at different loads and equivalence ratios, while the CO emissions increased at all operating conditions. It was found that reducing the advancement of ignition timing of the POFR-engine can further reduce the gaseous pollutant emissions without reducing the economic performance of the engine. In conclusion, blending reforming gas improved the overall performance of the natural gas engine at low to medium load conditions.

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Experimental study on combustion and emission of an SI engine with natural gas/ethanol combined injection

Cited by 11 publications

References 44 publications

Computational Analysis on Combustion Control of Diesel Engines Fueled with Ester Alcohol Diesel

Computational Analysis on Combustion Control of Diesel Engines Fueled with Ester Alcohol Diesel

Study on Combustion and Emissions of a Combined Injection Spark Ignition Engine with Natural Gas Direct Injection Plus Ethanol Port Injection under Lean-Burn Conditions

Effects of excess air ratio and spark timing on performance and gaseous pollutant emissions of fuel reforming natural gas engine

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