Findings on droplet breakup behavior of the preheated microalgae oil jet for efficiency improvement in diesel engines

Lebedevas, Sergėjus; Klyus, O.; Raslavičius, Laurencas; Krause, P.; Rapalis, Paulius

doi:10.1007/s13399-021-02162-w

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…Determination of the amount of heat energy generated during the combustion of the fuel charge Q i , based on the defined pressure inside the cylinder p(ϕ), which is obtained from experimental data. It is also needed to define the heat transfer through the walls Q W (ϕ); if only one pressure is defined then only the amount of useful heat Q can be determined, according to the Equation (7):…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…In recent years, diesel engine emissions were a target for alleviation, to a certain extent, through the research of experts and scholars [4][5][6]. For the road transport sector, a time span between 2022 and 2035 marks an uncertainty on how to ensure lower levels of GHG emissions if (i) in the case of a pessimistic scenario, the electrification of long-distance trucks will fail, and (ii) the large numbers of long-distance trucks driven by ICE will be left abandoned due to the era of electrified transport [7]. For the medium-term scenario, natural gas (CNG/LNG) vehicles have been promoted worldwide to mitigate air pollution [3,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Correlation for the Prediction of the Heat Release Characteristics of Diesel/CNG Mixtures in a Single-Zone Combustion Model

2023

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Fuel combinations with substantial differences in reactivity, such as diesel/CNG, represent one of the most promising alternative combustion strategies these days. In general, the conversion from diesel to dual-fuel operation can be performed in existing in-use heavy-duty compression-ignition engines with minimum modifications, which guarantee very little particles, less nitrogen oxide (NOx), and reduced noise by half compared to diesel. These factors make it feasible to retrofit a CNG fuel system on an existing diesel engine to operate it in dual fuel mode. However, the single-zone combustion models using the traditional single-Wiebe function are exceptionally adopted to assess the dedicated dual fuel engines, whereas the heat loss to the walls is estimated by using the Woschni heat loss formulation. It means that the fast and preliminary analysis of the unmodified engine performance by 1-zone models becomes complicated due to the obvious deterioration of the energy parameters, which, in turn, was predetermined from the deviation in the thermodynamic cycle variables as the calculation outcome. In this study, the main novelty lies in the fact that we propose a novel composition-considered Woschni correlation for the prediction of the heat release duration characteristics of diesel/CNG mixtures for the unmodified diesel engine. The elimination of former deficiencies distinctive to a single-zone thermodynamic model by applying the interim steps described became the core of the research presented in this paper. It led to successful derivation of the necessary correlation for modelling the heat release duration characteristics of an ICE operated in the dual fuel mode.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comprehensive Correlation for the Prediction of the Heat Release Characteristics of Diesel/CNG Mixtures in a Single-Zone Combustion Model

2023

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“…In addition, the diameters of droplets were in the range of 7.0-46.5 µm. Lebedevas et al [15] obtained the liquid jet breakup characteristics of microalgae oil (MAO100) at elevated temperatures using laser diffraction. The SMD distribution differed within the temporal evolution of the fuel spray for the injection, halftime, and end-time stages of jet propagation.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Droplet Behaviors during Spray Breakup Process

et al. 2023

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The variation of droplet parameters during the spray breakup process affects the droplet deposition behavior and accurate application. The aim of this study was to experimentally investigate droplet behaviors along the penetration direction with respect to spray propagation. Particle image analysis (PIA) was applied to obtain the characteristics of droplets at three representative stages (namely, initial, quasi-steady, and end stages) after the start of injection (ASOI). The effects of timing and location on the spray characteristics were thoroughly investigated. First, different morphological changes of spray (droplets, ligaments, and bags) during spray breakup were observed. The experimental results show that droplet size and velocity distinctly increase from upstream to downstream at the initial stage. However, at the quasi-steady and end stages, droplet velocities are similar, and the effects of location are not evident. This indicates that location has a significant effect on droplet behaviors at the initial stage. The mean minimum distance (MD) of droplets first increases considerably and then decreases from upstream to downstream, suggesting that the droplets disperse better at midstream. Moreover, the mean MD at the initial stage exceeds that at the quasi-steady and end stages, denoting that the droplets disperse better with time. Finally, the geometric parameter of droplets and the key stage selection are important for predicting the interaction between the droplets and surfaces.

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Simulation of microalgae oil spray characteristics for mechanical fuel injection and CRDI systems

Lebedevas

Raslavičius

Rapalis

2022

Biomass Conv. Bioref.

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Findings on droplet breakup behavior of the preheated microalgae oil jet for efficiency improvement in diesel engines

Cited by 6 publications

References 26 publications

Comprehensive Correlation for the Prediction of the Heat Release Characteristics of Diesel/CNG Mixtures in a Single-Zone Combustion Model

Comprehensive Correlation for the Prediction of the Heat Release Characteristics of Diesel/CNG Mixtures in a Single-Zone Combustion Model

Characteristics of Droplet Behaviors during Spray Breakup Process

Simulation of microalgae oil spray characteristics for mechanical fuel injection and CRDI systems

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