Fuel efficiency and exhaust characteristics of turbocharged diesel engine equipped with an electric supercharger

Baek, Seungju; Lee, Hyeonjik; Lee, Kihyung

doi:10.1016/j.energy.2020.119049

Cited by 15 publications

(9 citation statements)

References 14 publications

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“…This further increases the combustion rate and produced maximum combustion, which is characterized by an increase in the rate of heat released, leading to a high combustion temperature that makes it easier for the CO molecules to decompose and oxidize with oxygen to form CO2 (Baskar & Senthilkumar, 2016;Peng et al, 2018;Sarkar & Saha, 2018). Baek et al (2021) explained that the addition of combustion air decreased CO emissions because of the increased combustion.…”

Section: Co Emissionsmentioning

confidence: 99%

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Effect of Adding Combustion Air on Emission in a Diesel Dual-Fuel Engine with Crude Palm Oil Biodiesel Compressed Natural Gas Fuels

Yuvenda

Sudarmanta

Wahjudi

et al. 2022

Int. J. Renew. Energy Dev.

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A diesel dual-fuel engine uses two fuels designed to reduce the consumption of fossil fuels. Generally, the specific fuel consumption of diesel dual-fuel engines has increased. However, in combination with alternative fuels, namely compressed natural gas injected through air intake, the use of diesel fuel can be reduced. However, using two fuels in a diesel dual-fuel engine increases the equivalent ratio; therefore, the air and fuel mixture becomes richer because the air entering the cylinder during the intake stroke is partially replaced by compressed natural gas. This results in incomplete combustion and increases exhaust emissions, particularly hydrocarbon (HC) and carbon monoxide (CO) emissions. This study aims to improve the combustion process in dual-fuel diesel engines by improving the air-fuel ratio; thus, it can approach the stoichiometric mixture by adding combustion air forcibly to produce complete combustion to reduce CO and HC emissions. An experimental approach using a single-cylinder diesel engine modified into a diesel dual-fuel engine powered by crude palm oil biodiesel and compressed natural gas was adopted. The combustion air was forcibly added to the cylinder using an electric supercharger at different air mass flow rates ranging from 0.007074 to 0.007836 kg/s and different engine loads (1000 to 4000 watts). The results indicated that adding more air to the cylinder could produce complete combustion, reducing the emission levels produced by a diesel dual-fuel engine. An air mass flow rate of 0.007836 kg/s can reduce CO, HC, and particulate matter emissions by averages of 60.55%, 49.63%, and 86.87%, respectively, from the standard diesel dual-fuel engine. Increasing in the amount of oxygen concentration improves the quality of the air-fuel ratio, which results in improved combustion and thereby reducing emissions.

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Section: Co Emissionsmentioning

confidence: 99%

“…Notably, the reduction is caused by the improvement in the AFR, which leads to complete combustion (Peng et al, 2018). Baek et al (2021) explained that the addition of combustion air decreased HC emissions in diesel engine.…”

Section: Hc Emissionsmentioning

confidence: 99%

Effect of Adding Combustion Air on Emission in a Diesel Dual-Fuel Engine with Crude Palm Oil Biodiesel Compressed Natural Gas Fuels

Yuvenda

Sudarmanta

Wahjudi

et al. 2022

Int. J. Renew. Energy Dev.

View full text Add to dashboard Cite

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“…One approach towards this direction is the downsized IC engines [6] that can produce comparable power of a larger engine through the use of different techniques: turbocharging or supercharging, often coupled with direct injection (DI), advanced exhaust gas recirculation (EGR) or variable valve timing (VVT). The main benefits from the downsized engines are the increased thermal and fuel efficiencies [7][8][9][10][11] and the inherent high-power density [12]. Downsized engines have been reported to mitigate successfully CO 2 emissions by reducing the fuel consumption [13,14], making it a serious contender in reducing greenhouse emissions and harmful pollutants [6,15].…”

Section: Introductionmentioning

confidence: 99%

Asymptotic Analysis of Detonation Development at SI Engine Conditions Using Computational Singular Perturbation

Dimitrova¹,

Sanal²,

Luong³

et al. 2022

Preprint

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The occurrence and intensity of the detonation phenomenon at spark-ignition (SI) engine conditions is investigated, with the objective to successfully predict super-knock and to elucidate the effect of kinetics and transport at the ignition front. The computational singular perturbation (CSP) framework is employed in order to investigate the chemical and transport mechanisms of deflagration and detonation cases in the context of 2D high-fidelity numerical simulations. The analysis revealed that the detonation development is characterized by: (i) stronger explosive dynamics and (ii) enhanced role of convection. The role of chemistry was also found to be pivotal to the detonation development which explained the stronger explosive character of the system, the latter being an indication of the system's reactivity. The role of convection was found to be enhanced at the edge of the detonating front, thereby suggesting that it is the result and not the cause of the detonation onset. Moreover, the increased contribution of convection was found to be related mainly to heat convection. Remarkably, the detonation front was mainly characterized by dissipative and not explosive dynamics. Finally, diffusion was found to have negligible role to both examined cases.

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“…However, this ability is limited by their efficiency and mass flow rate characteristics, which is highly dependent on the engine speed [5,6]. There are two major drawbacks with turbochargers: turbo lag and their deficiency in low engine speeds, largely dominated by in-cylinder peak pressure, which through utilizing multi-stage turbocharging and simultaneous combination of turbocharger and supercharger have been mitigated [7]. However, this lag is inevitable due to mechanical structure.…”

Section: Introductionmentioning

confidence: 99%

“…The final result showed not only a torque improvement, but also a 4% increase in thermal efficiency. Baek et al explored the fuel economy and exhaust characteristics of a diesel engine equipped with TEDC showing that up to 8.8% reduction in Brake Specific Fuel Consumption (BSFC) can be achieved compared to the base condition [7]. Moreover, the amount of CO and HC were reduced as a result of the increased atomization of fuel by increasing the swirl motion in the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

A Model-Based Investigation of Electrically Split Turbocharger Systems Capabilities to Overcome the Drawbacks of High-Boost Downsized Engines

2022

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Engine downsizing is one the most common methods of coping with strict emission regulations. However, it must be coupled with complementary systems so that the engine performance would meet the standards. That is why new efficient solutions can pave the way toward this goal. The electric forced-induction system (EFIS) is the emerging replacement for conventional forced-induction systems (FIS), namely, turbochargers and superchargers. The reason behind this replacement is the drawbacks associated with FIS, among them are turbo lag and inefficiency in exhaust gas energy recycling. Electrically split turbocharger (EST) is a form of EFIS which offers a great potential for engine downsizing. In this paper, a new approach to EST utilization for lowering the fuel consumption (FC) without compromising performance has been introduced, through which the augmented degree of freedom enabled by an EST is used to optimize the air-charge boosting. To show the effectiveness of the proposed method, a model-based approach is used to compare two engines with and without EST technology; the performance of an already existing 1.6-l 4-cylinder turbocharged engine has been modeled based on the experimental data, and its performance indices are used as a benchmark for a downsized 1l 3-cylinder engine equipped with an EST. A comparison of these two engines in the dynamic drive cycles of the EPA Federal Test Procedure (FTP75) and Worldwide harmonized Light vehicles Test Cycles (WLTC) has shown a 28.87% and 25.35% reduction in FC, respectively, independent of the external electrical source. Furthermore, the downsized engine has shown superior performance through full-throttle acceleration in terms of torque transient response. Finally, the concept of coherence among gas-path components and its importance is presented, and knock precautions associated with air charging in this method are addressed.

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Fuel efficiency and exhaust characteristics of turbocharged diesel engine equipped with an electric supercharger

Cited by 15 publications

References 14 publications

Effect of Adding Combustion Air on Emission in a Diesel Dual-Fuel Engine with Crude Palm Oil Biodiesel Compressed Natural Gas Fuels

Effect of Adding Combustion Air on Emission in a Diesel Dual-Fuel Engine with Crude Palm Oil Biodiesel Compressed Natural Gas Fuels

Asymptotic Analysis of Detonation Development at SI Engine Conditions Using Computational Singular Perturbation

A Model-Based Investigation of Electrically Split Turbocharger Systems Capabilities to Overcome the Drawbacks of High-Boost Downsized Engines

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