Effects of in-Cylinder Bulk Flow and Methane Supply Strategies on Charge Stratification, Combustion and Emissions of a Dual-Fuel DI Diesel Engine

Carlucci, Antonio Paolo; Laforgia, Domenico; Saracino, Roberto

doi:10.4271/2009-01-0949

Cited by 16 publications

(8 citation statements)

References 9 publications

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“…Carlucci et al [19], investigated the controlling of combustion behaviour by application of injection strategy and natural gas addition, and underlined that by using the natural gas as an additive fuel (10e30%) while diesel fuel as main injection, resulted in unchanged engine efficiency, improved NOxesoot trade-off, but higher HC and CO emissions compared with original operation mode. In another work, Carlucci et al [20,21], further studied the effects of air bulk motion and methane injection strategies on the development and pollutant levels of dual-fuel combustion on a common rail engine. The results showed that, at low loads, the motion produced by the swirl inlet valve is able to induce a more rapid and complete combustion of the airemethane mixture after the ignition nuclei of the pilot fuel has been created and then simultaneously reduced the unburned hydrocarbons and nitrogen oxides content.…”

Section: Introductionmentioning

confidence: 97%

Experimental study of co-combustion ratio on fuel consumption and emissions of NG–diesel dual-fuel heavy-duty engine equipped with a common rail injection system

Zhang

Song

2016

Journal of the Energy Institute

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Section: Introductionmentioning

confidence: 97%

Experimental study of co-combustion ratio on fuel consumption and emissions of NG–diesel dual-fuel heavy-duty engine equipped with a common rail injection system

Zhang

Song

2016

Journal of the Energy Institute

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“…The use of NG for the conversion of petroleum-derived fossil fuels in DE is a promising approach for the strategic reduction of harmful emissions and greenhouse gas emissions in transport (IMO 2019a(IMO , 2019bArteconi et al 2010;EC 2018). Numerous studies have shown that using NG in a marine DE is one of the most effective means of significantly improving the exploitation and environmental parameters of vehicles: compared to traditional marine fuels, NO x emissions are reduced by 85…90%, CO 2 -by 10…20%, PM and SO x are almost non-existent (Anderson et al 2015;Thomson et al 2015;HoC 2012;IMO 2016;Carlucci et al 2009). The scientific aspects are well illustrated by the research results of the Wartsila 20 DF single cylinder marine engine (García Valladolid et al 2017).…”

Section: Introductionmentioning

confidence: 98%

Mathematical Modelling of Indicative Process Parameters of Dual-Fuel Engines With Conventional Fuel Injection System

2020

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Modern engine research uses multi-dimensional Mathematical Models (MMs) that are applicable to multi-fuel engines. However, their use involves the availability of detailed technical data on the design and characteristics of the engine, which is not always possible. The use of a one-dimensional MM is more expedient for the prediction of engine parameters, but their application for this purpose has not yet been sufficiently investigated. This publication presents the results of numerical studies evaluating the application of a one-dimensional MM with bi-phase Vibe combustion laws for dual-fuel (DF) Diesel (D) and Natural Gas (NG) engine power parameters. The motor test results of a high-speed 4ČN79.5/95.5 Diesel Engine (DE) with a conventional fuel injection system were used as adequacy criteria. The engines were operated with D100 and DF D20/NG80, in high- (HLM), medium- (MLM), and low- (LLM) load modes, and the angle of Diesel-fuel Injection Timing (DIT) was changed from −1 to −13 °CA in the Before Top Dead Center (BTDC) range. Modelling of the single-phase Vibe combustion law has limited applicability for efficient use only in HLM (with an error of 7%). In the MLM and LLM regimes, owing to non-compliance with real bi-phasic combustion with a strongly extended NG diffusive second phase, the modelling error is 50%. Individual MM matching in MLM and LLM in a DF D20/NG80 experiment detected a burn time increase from between 45 and 50 °CA, to 110 and 200 °CA, respectively. Limited use of the one-dimensional MM in the evaluation of DF engine performance has been identified. When comparing a one-dimensional MM with experimental data, a bi-phase law of heat release characteristic should be considered for better coincidence. In addition, individual MM matching with an experiment on each engine load mode ensured acceptable accuracy in testing and optimising the parameters of the indicator process, including DIT.

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“…These types of engines, also known as dual-fuel engines, can provide significant improvements in efficiency and emissions [16][17][18][19][20][21][22][23][24][25]. For example, in research on a dual-fuel cargo truck engine [26] a decrease in NO x of up to six times and decrease in CO of up to 83% were observed compared to diesel only operation.…”

Section: Introductionmentioning

confidence: 99%

Research on Fuel Efficiency and Emissions of Converted Diesel Engine with Conventional Fuel Injection System for Operation on Natural Gas

et al. 2019

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This paper presents a study on the energy efficiency and emissions of a converted high-revolution bore 79.5 mm/stroke 95 mm engine with a conventional fuel injection system for operation with dual fuel feed: diesel (D) and natural gas (NG). The part of NG energy increase in the dual fuel is related to a significant deterioration in energy efficiency (ηi), particularly when engine operation is in low load modes and was determined to be below 40% of maximum continuous rating. The effectiveness of the D injection timing optimisation was established in high engine load modes within the range of a co-combustion ratio of NG ≤ 0.4: with an increase in ηi, compared to D, the emissions of NOx+ HC decreased by 15% to 25%, while those of CO2 decreased by 8% to 16%; the six-fold CO emission increase, up to 6 g/kWh, was unregulated. By referencing the indicated process characteristics of the established NG phase elongation in the expansion stroke, the combustion time increase as well as the associated decrease in the cylinder excess air ratio (α) are possible reasons for the increase in the incomplete combustion product emission.

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Effects of in-Cylinder Bulk Flow and Methane Supply Strategies on Charge Stratification, Combustion and Emissions of a Dual-Fuel DI Diesel Engine

Cited by 16 publications

References 9 publications

Experimental study of co-combustion ratio on fuel consumption and emissions of NG–diesel dual-fuel heavy-duty engine equipped with a common rail injection system

Experimental study of co-combustion ratio on fuel consumption and emissions of NG–diesel dual-fuel heavy-duty engine equipped with a common rail injection system

Mathematical Modelling of Indicative Process Parameters of Dual-Fuel Engines With Conventional Fuel Injection System

Research on Fuel Efficiency and Emissions of Converted Diesel Engine with Conventional Fuel Injection System for Operation on Natural Gas

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