Assessment of the co-combustion process of ammonia with hydrogen in a research VCR piston engine

Pyrc, Michał; Gruca, Michał; Tutak, Wojciech; Jamrozik, Arkadiusz

doi:10.1016/j.ijhydene.2022.10.152

Cited by 39 publications

(7 citation statements)

References 35 publications

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“…Low levels of hydrogen addition allow stability improvement, acting as an ignition promoter and increasing laminar flame speed, but this single factor does not fully explain the improvement in operation achieved [161]. The high octane number of ammonia (130) makes the engine operate under higher compression ratios than the one used for gasoline [162], and the different burning characteristics of hydrogen and ammonia allow for attaining a mixture proportion capable of reaching a similar performance regarding work output as that obtained with gasoline [163]. This approach's main disadvantage is the need for separate fuel storing tanks, making the system too complex for on-board applications.…”

Section: Spark Ignition Enginesmentioning

confidence: 99%

Ammonia Can be Currently Considered as one of the Best Green Energy Ally

González,

Gómez

2024

Preprint

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Ammonia can be considered a relevant compound in the future energy sector, playing a significant role as an energy carrier, storage, or carbon-free fuel. However, the production of this molecule has a high energy demand, and the use of natural gas, which is not free of controversy due to the accidental leakage into the atmosphere produced during extraction and the fact that it is a non-renewable source, contributes to increasing greenhouse gas emissions. Reducing the process’s energy demand and carbon footprint will be essential to making ammonia a clear alternative for a carbon-free economy. Given the vast experience in ammonia production and handling, this gas seems to be the logical step forward in the evolution of the energy sector. However, the current uncertainty in the global market requires cautiousness in decision-making. Several factors may impact economic growth and human welfare, thus needing a careful assessment before taking any transcendental decisions that could affect worldwide energy prices and raw material availability.

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Section: Spark Ignition Enginesmentioning

confidence: 99%

Ammonia Can be Currently Considered as one of the Best Green Energy Ally

González,

Gómez

2024

Preprint

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“…After correcting the laminar flame velocity model, the GT-power model is experimentally validated for different blending ratios based on the experimental data of cylinder pressure and heat release rate from Pyrc et al [39]. Figure 4 demonstrates the cylinder pressure and heat release rate of the simulation results compared with the experimental data.…”

Section: Gt-power Model Validationmentioning

confidence: 99%

Simulation Study on Combustion Performance of Ammonia-Hydrogen Fuel Engines

Zhao,

Gao,

et al. 2024

Energies

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Ammonia is a very promising alternative fuel for internal combustion engines, but there are some disadvantages, such as difficulty in ignition and slow combustion rate when ammonia is used alone. Aiming to address the problem of ammonia combustion difficulty, measures are proposed to improve ammonia combustion by blending hydrogen. A one-dimensional turbocharged ammonia-hydrogen engine simulation model was established, and the combustion model was corrected and verified. Using the verified one-dimensional model, the effects of different ratios of hydrogen to ammonia, different rotational speeds and loads on the combustion performance are investigated. The results show that the ignition delay and combustion duration is shortened with the increase of the hydrogen blending ratio. The appropriate amount of hydrogen blending can improve the brake’s thermal efficiency. With the increase in engine speed, increasing the proportion of hydrogen blending is necessary to ensure reliable ignition. In conclusion, the ammonia-hydrogen fuel engine has good combustion performance, but it is necessary to choose the appropriate hydrogen blending ratio according to the engine’s operating conditions and requirements.

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“…The conducted research shows that increasing the H2 share causes an increase in NO emissions, for both analyzed compression ratios. 8 By changing the local shape of the piston to extend the life of the piston, many scholars and manufacturers have their own ideas. Ferrocomp forged steel head and forged steel skirt combined piston developed by Mahler Company of Germany.…”

Section: Improvement Of Piston Structure Of Internal Combustion Enginementioning

confidence: 99%

“…The conducted research shows that increasing the H2 share causes an increase in NO emissions, for both analyzed compression ratios. 8…”

Section: Introductionmentioning

confidence: 99%

Study on lubrication performance of engine piston skirt with bionic design

Bo,

Song,

Weijun

et al. 2023

Advances in Mechanical Engineering

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As the main friction pair of engine, the friction loss of piston-cylinder liner assembly in the working process has become the main reason of engine friction power consumption. Many species in the biological world have formed non-smooth forms of resistance reduction after thousands of years of survival and evolution. Many people have applied this non-smooth shape of drag reduction on organisms to the surface of friction pairs in construction machinery. Based on LX108 engine, the wear and erosion resistance of Scapharca subcrenata surface is applied to the piston skirt, which is the main friction pair in the engine. Nine test schemes were designed according to orthogonal test. This design selects three factors, namely, groove distribution type, groove depth and width, groove spacing, and each factor includes three levels. The macroscopic fluid lubrication state of the whole piston skirt with bionic shape is studied. Through the change of oil film thickness caused by thermal-mechanical coupling deformation of skirt, combined with the average Reynolds equation, the hydrodynamic pressure of lubricating oil, shear stress, and skirt friction force are obtained to verify the contribution of bionic shape to piston drag reduction, wear reduction, wetting increase, and friction power consumption. The simulation and test results show that the lubrication of all parts of the bionic groove piston skirt is better than that of the standard piston; When the depth and width of groove is 0.8 mm and the spacing is 10°, the thicker the oil film thickness of skirt is; The bionic piston whose oil film bearing area is 74%–87% of the standard piston has the smallest normal pressure and friction; When the upper end of the skirt is arranged with groove shape and the lower end is arranged with narrow groove shape between wide grooves, the lubrication effect is better.

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Assessment of the co-combustion process of ammonia with hydrogen in a research VCR piston engine

Cited by 39 publications

References 35 publications

Ammonia Can be Currently Considered as one of the Best Green Energy Ally

Ammonia Can be Currently Considered as one of the Best Green Energy Ally

Simulation Study on Combustion Performance of Ammonia-Hydrogen Fuel Engines

Study on lubrication performance of engine piston skirt with bionic design

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