Parametric Analysis of the Effect of Pilot Quantity, Combustion Phasing and EGR on Efficiencies of a Gasoline PPC Light-Duty Engine

Belgiorno, Giacomo; Dimitrakopoulos, Nikolaos; Blasio, Gabriele Di; Tunér, Martin; Tunestål, Per

doi:10.4271/2017-24-0084

Cited by 34 publications

(19 citation statements)

References 23 publications

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“…Nevertheless, this issue can be mitigated by using blends of both fuels. Furthermore, other proven approaches of advanced combustion concepts such as dual fuel, partially premixed combustion [26] combined with alternative fuels (natural gas, ethanol-biodiesel blends, etc.) could give a potential boost to the CI engine fuel economy and engine-out emissions reduction [27,28].…”

Section: Biodieselmentioning

confidence: 99%

Fuel Injection Responses and Particulate Emissions of a CRDI Engine Fueled with Cocos nucifera Biodiesel

et al. 2021

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The objective of this paper is to study the effect of coconut oil biodiesel (COB)-diesel blends on exhaust particulate matter (PM) emissions and fuel injection responses in an unmodified turbocharged four-stroke common-rail direct injection (CRDI) diesel engine. Characterization of COB and their blends has been conducted to ascertain the applicability of these fuels for the existing engine. The test fuels used were fossil diesel fuel, COB10, COB20, COB30 and COB50 of biodiesel-diesel fuels. A test cycle which composed of 16 different steady-state modes at various loads and speed conditions was followed. Generally, the results showed a marginally advanced SOI timing and longer injection duration with increasing COB blends at higher load as compared to diesel fuel. Additionally, the lower calorific value (CV) and higher viscosity of the COB fuel blends have resulted in reduced turbo boost pressure and increased common-rail fuel injection pressure, respectively, across all engine speeds and loads. On the aspects of PM emissions characterization, results indicated that the blending of COB with conventional diesel had benefits over diesel in PM reduction. In fact, the largest achievable PM mass reduction of 38.55% was attained with COB50. In addition, it was noticed that the size of PM particles accumulated such that the granular size increased with higher diesel content in the blend. Additionally, the composition analysis on the PM collected by EDX spectroscopy has revealed that the C, O and Si as three main elements that made up the PM particles in descending order. Overall, the results indicated that COB biodiesel is a clean-burning alternative fuel and can be used satisfactorily in an unmodified diesel engine without the needs for engine remapping.

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Section: Biodieselmentioning

confidence: 99%

Fuel Injection Responses and Particulate Emissions of a CRDI Engine Fueled with Cocos nucifera Biodiesel

et al. 2021

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“…These combustion strategies, termed low temperature combustions (LTC), are usually characterized by high ignition delays (which guarantee a more homogeneous air-fuel mixing) and by the lean combustion of a mixture of air and gasoline-like fuels [3][4][5]. These combustion methodologies proved to be effective to simultaneously reduce engine-out emissions and improve efficiency [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Injection Pattern Investigation for Gasoline Partially Premixed Combustion Analysis

Stola¹,

Ravaglioli

Silvagni

et al. 2019

SAE Technical Paper Series

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Nowadays, compression-ignited engines are considered the most efficient and reliable technology for automotive applications. However, mainly due to the current emission regulations, that require increasingly stringent reductions of NOx and particulate matter, the use of diesel-like fuels is becoming a critical issue. For this reason, a large amount of research and experimentation is being carried out to investigate innovative combustion techniques suitable to simultaneously mitigate the production of NOx and soot, while improving engine efficiency. In this scenario, the combined use of compression-ignited engines and gasoline-like fuels proved to be very promising, especially in case the fuel is directly-injected in the combustion chamber at high pressure. The presented study analyzes the combustion process produced by the direct injection of small amounts of gasoline in a compression-ignited light-duty engine. The engine under investigation has been modified to guarantee a stable engine operation over its whole operating range, that is achieved controlling boost pressure and temperature, together with the design of the injection pattern. Experimental tests have been performed to highlight the impact of several control variables on the combustion effectiveness, i.e. on combustion efficiency and ignition delay. To identify the main mechanisms which impact the start of the combustion process and the sensitivity to the variation of the main control parameters, several tests have been run, directly-injecting constant amounts of gasoline in a compression ignited engine. These tests have been performed changing intake pressure and temperature (when suitable to maintain combustion stability), fuel pressure and injection timing within the cycle.

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“…These results show that operation with biodiesel blends leads to less brake power for the same fuel energy rate, since biodiesel has a lower heating value than diesel. Considering B20DEE and B20BHT, the conversion rates of fuel energy to brake power showed slight increases, compared to diesel fuel, which were 35.15% and 35.64%, respectively; this might be due to the higher oxygen content of fuel additives in their molecule structure and also to their low viscosity [ 50 , 51 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

“…Materials 2021, 14, x FOR PEER REVIEW 20 of 23 which were 35.15% and 35.64%, respectively; this might be due to the higher oxygen content of fuel additives in their molecule structure and also to their low viscosity [50][51][52].…”

Section: Energy Analysismentioning

confidence: 99%

Comprehensive Assessment from Optimum Biodiesel Yield to Combustion Characteristics of Light Duty Diesel Engine Fueled with Palm Kernel Oil Biodiesel and Fuel Additives

et al. 2021

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Biodiesel is considered as a key prospective renewable energy source in India. Hence, a study was carried out for the improvement of palm kernel oil biodiesel production using a transesterification process at different molar ratios. This study comprehensively examined all aspects of biodiesel from optimum production to the effect of additives on its combustion behavior. The optimum yield condition was validated with the MINITAB-17 software and analyzed using the Taguchi method. Two different additives, 5% diethyl ether (DEE) and 2000 ppm Butylated hydroxyltoluene (BHT), were also experimented. Engine experiments were conducted at constant speed (1500 rpm) and five different engine loads (0, 25, 50, 75 and 100%) on a single-cylinder direct injection diesel engine. Heat release rate, brake specific fuel consumption, brake thermal efficiency, engine emissions, such as CO, HC, NOx, and smoke opacity were analyzed. The maximum palm kernel oil (PKO) biodiesel yields, obtained at 55 °C, for the KOH and NaOH catalysts were 86.69% and 75.21% at the molar ratio of 6:1. B20BHT combustion showed 4.6% higher brake thermal efficiency (BTE). NOx emission was reduced by 19.4%, compared to the diesel fuel values. DEE resulted in higher CO and HC emissions compared to diesel fuel values by 39.2% and 7.6%, respectively, whereas smoke emission was improved by 11.5%.

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Parametric Analysis of the Effect of Pilot Quantity, Combustion Phasing and EGR on Efficiencies of a Gasoline PPC Light-Duty Engine

Cited by 34 publications

References 23 publications

Fuel Injection Responses and Particulate Emissions of a CRDI Engine Fueled with Cocos nucifera Biodiesel

Fuel Injection Responses and Particulate Emissions of a CRDI Engine Fueled with Cocos nucifera Biodiesel

Injection Pattern Investigation for Gasoline Partially Premixed Combustion Analysis

Comprehensive Assessment from Optimum Biodiesel Yield to Combustion Characteristics of Light Duty Diesel Engine Fueled with Palm Kernel Oil Biodiesel and Fuel Additives

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