Computational study of hydrogen engine combustion strategies: Dual-Fuel compression ignition with Port- and Direct-Injection, Pre-Chamber Combustion, and Spark-Ignition

Article Thermodynamics

Numerical investigation of the effect of injection strategy on a high-pressure isobaric combustion engine

Xinlei Liu et al.

Summary: This study numerically explored the effects of different injection strategies on isobaric combustion and found that higher EGR rate and engine speed can improve thermal efficiency.

INTERNATIONAL JOURNAL OF ENGINE RESEARCH (2023)

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Article Energy & Fuels

Hydrogen pre-chamber combustion at lean-burn conditions on a heavy-duty diesel engine: A computational study

Xinlei Liu et al.

Summary: The combustion of hydrogen in engines produces few harmful emissions, with the exception of nitric oxides (NOx), which can be reduced under lean-burn conditions. This study investigated the feasibility of hydrogen pre-chamber combustion in a heavy-duty diesel engine using CFD modeling. The results showed that the pre-chamber combustion effectively controlled heat release and reduced NOx emissions, but also decreased complete combustion and combustion stability. The engine operating range could be extended by introducing fuel into the pre-chamber and adjusting the pre-chamber throat diameter to control the pressure rise rate.

FUEL (2023)

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Article Energy & Fuels

Optical experiments on the effect of turbulent jet ignition on lean burning and engine knocking

Lin Chen et al.

Summary: The turbulent jet ignition with pre-chamber can effectively improve combustion efficiency, but larger pre-chamber volume results in higher heat dissipation and throttling loss, leading to lower IMEP. On the other hand, a smaller pre-chamber volume can enhance lean combustion thermal efficiency and stability.

FUEL (2022)

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Article Chemistry, Physical

Effect of supercharging on improving thermal efficiency and modifying combustion characteristics in lean-burn direct-injection near-zero-emission hydrogen engines

Masakuni Oikawa et al.

Summary: The Plume Ignition Combustion Concept (PCC) proposed by the authors improves thermal efficiency in a hydrogen engine by spark-igniting the plume of a hydrogen jet, reducing cooling loss, and maintaining high power. By applying PCC to a lean-burn regime and introducing supercharging, further improvements in thermal efficiency and power output were achieved.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2022)

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Article Biochemistry & Molecular Biology

A Critical Review of Renewable Hydrogen Production Methods: Factors Affecting Their Scale-Up and Its Role in Future Energy Generation

Ephraim Bonah Agyekum et al.

Summary: This study provides an overview of renewable hydrogen production, focusing on water splitting and biomass mechanisms. It also discusses the barriers to scaling up the hydrogen economy globally and provides recommendations for future research and policy direction.

MEMBRANES (2022)

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Editorial Material Thermodynamics

The role of hydrogen for future internal combustion engines

A. Onorati et al.

INTERNATIONAL JOURNAL OF ENGINE RESEARCH (2022)

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Article Chemistry, Physical

Exploring the potentials of lean-burn hydrogen SI engine compared to methane operation

Paolo Sementa et al.

Summary: This study investigates the performance and emissions of a single-cylinder SI engine operating under lean-burn hydrogen combustion and compares it to methane under similar conditions. The results show that hydrogen combustion achieves stable combustion with lower pollutant emissions and higher efficiency, making it a promising clean fuel to replace conventional fuels.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2022)

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Article Chemistry, Physical

Direct injection of hydrogen main fuel and diesel pilot fuel in a retrofitted single-cylinder compression ignition engine

Xinyu Liu et al.

Summary: In this study, a parametric investigation was conducted on a hydrogen diesel dual-fuel direct injection engine. It was found that at a hydrogen energy fraction of 90%, the engine achieved high indicated mean effective pressure and efficiency, but at the expense of increased NOx emissions. The hydrogen injection timing directly influenced the combustion mode and mixture condition. By adjusting the hydrogen injection timing, the engine performance could be optimized to achieve a reduction in CO2 emissions and an increase in IMEP/efficiency.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2022)

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Article Energy & Fuels

Comparative Study of Spark-Ignited and Pre-Chamber Hydrogen-Fueled Engine: A Computational Approach

Hammam Aljabri et al.

Summary: This study investigates the potential of hydrogen combustion in internal combustion engines, focusing on spark ignition and pre-chamber modes. The research explores various parameters, such as compression ratio, air-fuel ratio, and spark timing, to optimize engine combustion performance and reduce emissions. It also discusses the limitations and challenges of using pre-chamber combustion in hydrogen engine applications.

ENERGIES (2022)

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Article Thermodynamics

Computational assessment of effects of throat diameter on combustion and turbulence characteristics in a pre-chamber engine

Mickael Silva et al.

Summary: This study investigates the effect of throat diameter on pre-chamber combustion using computational fluid dynamics. The results show that throat diameter changes the flow field inside the pre-chamber, impacting air-fuel ratio, turbulence, jet dynamics, and ultimately the combustion processes and heat fluxes in the pre and main chambers.

APPLIED THERMAL ENGINEERING (2022)

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Article Chemistry, Physical

Performance and emissions of hydrogen-diesel dual direct injection (H2DDI) in a single-cylinder compression-ignition engine

Xinyu Liu et al.

Summary: The implementation of hydrogen-diesel dual direct injection technology in a compression-ignition engine can improve efficiency and reduce noise and emissions, with the choice of injection timing affecting combustion behavior.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article Energy & Fuels

Operation strategy optimization of lean combustion using turbulent jet ignition at different engine loads

Jianxiong Hua et al.

Summary: The study designed a TJI device with additional fuel supply, analyzed its combustion characteristics, and optimized the operation strategy on a single-cylinder engine. The results showed stable combustion and reduced fuel consumption rate at different loads, proposing a technical solution for flexible air/fuel ratio regulation.

APPLIED ENERGY (2021)

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Article Chemistry, Physical

Computational characterization of hydrogen direct injection and nonpremixed combustion in a compression-ignition engine

Rafig Babayev et al.

Summary: This computational study evaluates the characteristics of H-2 direct-injection compression-ignition non-premixed combustion concept, focusing on hydrogen's unique features and the need to rethink optimization strategies for CI engines when using H-2 as fuel. The research contributes to the future development of DICI H-2 combustion engines by providing detailed characterization of the combustion cycle and highlighting key differences between CI non-premixed H-2 and diesel combustion.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article Energy & Fuels

Numerical investigation on the combustion and emission characteristics of a heavy-duty natural gas-diesel dual-fuel engine

Xinlei Liu et al.

Summary: A comprehensive numerical study on the combustion and emission characteristics of a NG-diesel dual-fuel engine operating at high load conditions was conducted, proposing a pathway to achieve highly efficient and clean combustion. It was found that utilizing at least a 40% EGR rate is necessary to meet NOx Euro VI regulation limits, while other parameters such as injection pressure and nozzle number also play important roles in promoting engine efficiency and reducing emissions.

FUEL (2021)

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Review Chemistry, Physical