Hydrogen combustion analysis via infrared and visible optical diagnostics combined with CFD in a dual fuel engine at low load

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 81, P. 418 - 435

Published: July 24, 2024

Dual Fuel (DF) combustion concept has demonstrated to be a valid solution ensure the utilization of diesel engines in heavy duty and naval applications. The substitution part fuel with cleaner gaseous one can reduce among others: carbon dioxides (CO2), nitrogen oxides (NOx) surely particulate matter (PM). Nevertheless, difficulties encountered by reduced pilot liquid jet reach out furthest areas chamber, especially at partial load, lead unburned emissions premixed charge. They serious issue overcome when is represented carbonaceous like natural gas (NG). For this reason, hydrogen, that carbon-free, represents new progression clean mobility. This work aims deepening in-cylinder phenomena through synergetic methodology involves experimental optical diagnostics 3D numerical investigations. activity carried on single cylinder research engine (SCRE) equipped an apparatus allowing visualization process, later processed via high speed visible (VIS) infrared (IR) imaging. Several filters applied IR camera permit detect specific species such as CO2. Subsequently, these outcomes are used validate models, turn, results help detected qualitatively identify which ones majorly affect physical chemical processes. Numerical simulations performed ANSYS Forte ® code geometry accurately reproduces shape chamber. Combustion models include turbulent-kinetic interaction model mechanism 124 660 reactions deal autoignition phase surrogate oxidation, while account for flame propagation charge G-equation considered. reference test cases characterized two different speeds, 1500 2000 rpm, low load level, corresponding 2 bar brake mean effective pressure (BMEP) light-duty vehicle. hydrogen energy shares between 83.2 81.8%. Results demonstrate images OH radical key detection ignition process both hydrogen. air/H2 observed CFD elaborations. Finally, emission levels adequately predicted chosen oxidation models.

Language: Английский

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A comparative study of the lubricating properties of various types of base oils containing hydrogen emulsions

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 86, P. 564 - 576

Published: Aug. 31, 2024

Language: Английский

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Hydrogen driven HCCI engine combustion and performance indices: a numerical investigation

Australian Journal of Mechanical Engineering, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 18

Published: Dec. 4, 2024

Interest in hydrogen-powered engines is growing due to their potential reduce greenhouse gas emissions and decrease reliance on fossil fuels. This research examines how the start of combustion (SOC) impacts performance homogeneous charge compression ignition (HCCI) using hydrogen exclusively. Using numerical simulations with a 0D multi-zone HCCI model, study investigates parameters such as ratio (CR), equivalence (ER), intake temperature (ICT) assess influence engine performance. The results uncover hydrogen's unique behaviour, characterised by its physiochemical properties low-temperature combustion. identifies an optimal ER range 0.1 0.3, various ICTs it playing pivotal role promoting auto-ignition accelerating However, 0.4 ICT 393 K produces relatively higher indicated thermal efficiency, which affected knocking rate pressure rise, constraining range. Additionally, explores dilution expand mode. These insights provide valuable guidance for enhancing operation hydrogen-fuelled engines, facilitating transition cleaner more efficient propulsion systems transportation.

Language: Английский

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