Improvement of ecological characteristics of the hydrogen diesel engine

Natriashvili, Tamaz; Кавтарадзе, Р. З.; Glonti, M. G.

doi:10.1088/1757-899x/315/1/012018

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…18 The former three solutions require additional complications to the combustion system, while the last approach would have an impact on the engine efficiency, operating range, and, potentially, emissions. Additional challenges, such as potentially significant NOx emissions [19][20][21][22] and the need for high-pressure gas injection systems, further complicated and thus slowed the development of CI nonpremixed H 2 engines.…”

Section: Introductionmentioning

confidence: 99%

Computational optimization of a hydrogen direct-injection compression-ignition engine for jet mixing dominated nonpremixed combustion

Babayev

Andersson

Dalmau

et al. 2021

International Journal of Engine Research

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Hydrogen (H2) nonpremixed combustion has been showcased as a potentially viable and preferable strategy for direct-injection compression-ignition (DICI) engines for its ability to deliver high heat release rates and low heat transfer losses, in addition to potentially zero CO2 emissions. However, this concept requires a different optimization strategy compared to conventional diesel engines, prioritizing a combustion mode dominated by free turbulent jet mixing. In the present work, this optimization strategy is realized and studied computationally using the CONVERGE CFD solver. It involves adopting wide piston bowl designs with shapes adapted to the H2 jets, altered injector umbrella angle, and an increased number of nozzle orifices with either smaller orifice diameter or reduced injection pressure to maintain constant injector flow rate capacity. This work shows that these modifications are effective at maximizing free-jet mixing, thus enabling more favorable heat release profiles, reducing wall heat transfer by 35%, and improving indicated efficiency by 2.2 percentage points. However, they also caused elevated incomplete combustion losses at low excess air ratios, which may be eliminated by implementing a moderate swirl, small post-injections, and further optimized jet momentum and piston design. Noise emissions with the optimized DICI H2 combustion are shown to be comparable to those from conventional diesel engines. Finally, it is demonstrated that modern engine concepts, such as the double compression-expansion engine, may achieve around 56% brake thermal efficiency with the DICI H2 combustion, which is 1.1 percentage point higher than with diesel fuel. Thus, this work contributes to the knowledge base required for future improvements in H2 engine efficiency.

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Section: Introductionmentioning

confidence: 99%

Computational optimization of a hydrogen direct-injection compression-ignition engine for jet mixing dominated nonpremixed combustion

Babayev

Andersson

Dalmau

et al. 2021

International Journal of Engine Research

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“…Another direction of improving the environmental characteristics of diesel engines is the development of diesel-hydrogen engines [8]. However, when some limit concentrations of hydrogen are reached, on the contrary, the effects of a significant deterioration in the productivity and environmental friendliness of diesels can be observed [9].In addition, vibration characteristics and exhaust gases of engines and biodiesels are very important environmental issues in this field [10].…”

Section: Introductionmentioning

confidence: 99%

Method for measuring locomotive diesels characteristics for environmental monitoring tasks

2019

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A method for measuring diesel engines characteristics based on recording the irregularities of time parameters of the crankshaft rotation is proposed. We demonstrate that the change of diesel engines characteristics significantly affects the established norms and limit values of engine emissions of pollutants and harmful substances. The ways of improving the environmental characteristics of diesel engines, including change of fuel composition by adding mixtures are considered. A method of control of the diesel engine parameters consisting in measuring the instantaneous values of the speed of the crankshaft rotation and assessing the deviations of these parameters from normal values has been proposed. The method is implemented in the form of procedures including data collection from sensors installed on the engine, data filtering, and their characteristic analysis. An autonomous measuring device based on the microcontroller has been developed with the help of which data has been collected from the sensors of the 16-cylinder turbocharged engine. We have carried out experiments on process data that determine possibly faulty engine elements that worsen its environmental parameters.

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“…Diesel engines are a significant source of pollutant emissions [1], especially nitrogen oxides (NOX). The most approaches include reducing formation of pollutants within the engine [2][3][4] or control of the emissions in the exhaust gases using aftertreatment technologies.…”

Section: Introductionmentioning

confidence: 99%

Development of the model for a diesel engine catalytic converter

2019

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One of the key issues of the modern engine development is to comply with today’s stringent emission standards. It forces the manufacturers to enhance in-engine and after treatment emission reduction technologies continuously. The selective catalytic reduction (SCR) is still the most effective technique for nitrogen oxides removal from exhaust gases of vehicles with diesel engines. Numerical modelling is widely used for SCR systems development and assessment. In this paper, a simplified one-dimensional numerical model of diesel SCR catalyst, which was implemented in Matlab, is described. The algorithm for automatic mesh generation describing real cross-section geometry of the catalyst block and the calculation procedure allowing to take into account non-uniform distribution of the gas flow parameters at the catalyst inlet are presented. Model was validated by the experimental data available in the literature. Numerical simulations for the full-scale modern SCR catalyst were carried out. The effect of the gas velocity non-uniformity at the catalyst inlet on the overall NOx reduction efficiency was evaluated.

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Improvement of ecological characteristics of the hydrogen diesel engine

Cited by 5 publications

References 5 publications

Computational optimization of a hydrogen direct-injection compression-ignition engine for jet mixing dominated nonpremixed combustion

Computational optimization of a hydrogen direct-injection compression-ignition engine for jet mixing dominated nonpremixed combustion

Method for measuring locomotive diesels characteristics for environmental monitoring tasks

Development of the model for a diesel engine catalytic converter

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