Effect of Different Combustion Modes on the Performance of Hydrogen Internal Combustion Engines under Low Load

Wei, Wei; He, Xu; Zhu, Hua; Duan, Junfa; Qin, Gaolin

doi:10.3390/su14106095

Cited by 4 publications

(6 citation statements)

References 16 publications

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“…27 In order to select the best intake structure, the influence of different intake structures on the flow field, combustion and emission characteristics of small rotating internal combustion engine cylinders is compared and analyzed, and the optimal internal combustion engine intake structure is finally selected by analyzing and studying the internal combustion engine flow field, combustion and emission aspects. 28,29 As shown in Table 3, it is the specific parameters such as pressure and temperature of the intake air at different intake structures. The operating conditions of the small rotating internal combustion engine are set to: speed 3000 r/min, intake pressure 0.35 bar, equivalent ratio Φ = 0.8, The air-fuel ratio is 14.7.…”

Section: Effect Of Air Intake Structure On Combustion Characteristics...mentioning

confidence: 99%

“…The intake structure is also an important factor affecting the performance of the internal combustion engine, and many scholars at home and abroad have optimized the intake structure to improve the performance of the internal combustion engine and reduce the emissions of the internal combustion engine 27 . In order to select the best intake structure, the influence of different intake structures on the flow field, combustion and emission characteristics of small rotating internal combustion engine cylinders is compared and analyzed, and the optimal internal combustion engine intake structure is finally selected by analyzing and studying the internal combustion engine flow field, combustion and emission aspects 28,29 . As shown in Table 3, it is the specific parameters such as pressure and temperature of the intake air at different intake structures.…”

Section: Combustion Characteristics Studymentioning

confidence: 99%

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Study on combustion and emission characteristics of a micro‐rotary cam internal combustion engine

Zhu,

Yang,

Hao

et al. 2023

Engineering Reports

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In this article, the construction principle of rotary engine and sliding vane internal combustion engine is carefully analyzed, and the concept of micro‐rotary cam internal combustion engine is proposed by integrating and innovating on them. Overall design, theoretical analysis, and model making of miniature rotary cam internal combustion engine and its supporting system. The effects of different air intake modes and different ignition advance angles on the combustion and emission characteristics of internal combustion engines were studied. Through the study of the flow field, combustion and emission characteristics of small rotating internal combustion engines, it is found that the intake form has a great influence on the cylinder smoothness of rotating internal combustion engines. The vortex formed by the end cover inlet air in the middle of the combustion chamber can fully mix the fuel and air in the cylinder, and the mixture is evenly distributed in the combustion chamber to effectively promote the spread of flame. Compared with the surrounding air intake structure, the heat release should be increased by 4.3%, and the total amount of HC and CO generated was 26.8% and 15.7% less, respectively. By studying the turbulent kinetic energy, combustion heat release, peak temperature and pressure in the cylinder, fuel consumption rate and emission characteristics of small rotary internal combustion engine, it is found that when the ignition advance angle of the small rotating internal combustion engine is 5°, the peak pressure in the cylinder is increased by 2.3% compared with other schemes, the fuel consumption rate is high, and the combustion is more complete. In addition, in terms of emission characteristics, the amount of CO and HC generated when the ignition advance angle is 5° are reduced by 35% and 35.3%, respectively.

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Section: Effect Of Air Intake Structure On Combustion Characteristics...mentioning

confidence: 99%

Section: Combustion Characteristics Studymentioning

confidence: 99%

Study on combustion and emission characteristics of a micro‐rotary cam internal combustion engine

Zhu,

Yang,

Hao

et al. 2023

Engineering Reports

View full text Add to dashboard Cite

show abstract

“…During the past years, more and more strict requirements for exhaust emissions have led to the gradual attention to the alternative fuel for diesel engines. Natural gas, biodiesel, liquefied petroleum gas, hydrogen and alcohol fuels are the dominant alternative energy sources at present [8]. As a self-oxygenating fuel, ethanol can increase the concentration of oxygen in the combustion reaction, resulting in more efficient combustion.…”

Section: Introductionmentioning

confidence: 99%

“…It is also a green fuel and very environmentally friendly as it produces very little exhaust gas, no CO, HC or soot emissions. In addition to this, the hydrogen flame travels faster in the engine than diesel, resulting in higher efficiency [8]. Hydrogen also has a larger ignition limit and a higher diffusion coefficient, making it easier to achieve leaner combustion, which results in better fuel economy [8].…”

Section: Introductionmentioning

confidence: 99%

Application of Miller Cycle and Net-Zero Fuel(s) to Diesel Engine: Effect on the Performance and NOx Emissions of a Single-Cylinder Engine

Yang

Wang

2023

Energies

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Diesel engines play a very significant role in the automotive industry, but the total emissions of diesel engines are more than 1.8 times that of petrol engines. It is therefore important for diesel engines to control emissions. Theoretically, the Miller cycle can be used to achieve NOx reductions by changing the effective compression ratio, while it has become increasingly popular in recent years with the increasing maturity of current turbocharging technology. Based on Ricardo WAVE software, this paper analyses the NOx emissions and engine performance of diesel engines by modelling and simulating their operation under different loads with two types of Miller cycles (EIVC and LIVC) at different degrees. Simulation of engines operating under different loads allows a more comprehensive study of the effects of the Miller cycle on the engine, and a specific analysis in the context of the actual engine operating environment. The result is that both versions of the Miller cycle are most effective in reducing NOx emissions at 10% load, showing a maximum reduction of 21% for EIVC and 37% for LIVC. However, as the Miller cycle decreases engine power, the paper further investigates the application of turbocharger systems in the EIVC Miller cycle, with results showing a 32% increase in brake power at 10% load and −25% EIVC Miller cycle degree. Both ethanol-fueled diesel-cycle and Miller cycle engines were also analyzed, and a reduction in NOx emissions was observed, as well as hydrogen engine performance and NOx emissions.

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“…A similar modeling approach was also implemented by Wei et al [9] when addressing the HICE performance at low load; a detailed hydrogen-air chemical reaction mechanism is coupled with a CFD combustion model implemented in the CONVERGE software 3.0 to assess the role of exhaust gas recirculation (EGR) dilution when attempting an increase of the in-cylinder temperature and pressure, and therefore, an increase in the indicated thermal efficiency with a fuel-air ratio below 1.2.…”

Section: Introductionmentioning

confidence: 99%

Autoignition Characterization of Hydrogen Directly Injected into a Constant-Volume Combustion Chamber through a Heavy-Duty Injector

Caricato,

Carlucci,

Potenza

et al. 2023

Energies

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One factor limiting the exploitation of hydrogen as a fuel in internal combustion engines is their tendency to autoignition. In fact, on one hand, its low activation energy facilitates autoignition even with low compression ratios; on the other hand, this can become uncontrollable, due, for instance, to the presence of hot spots in the combustion chamber or to the collision of hydrogen on close surfaces. This represents a limit to the use of hydrogen at medium–high loads, therefore limiting the power density of the engine. In this work, hydrogen was injected at a pressure ranging between 15 and 25 bars into a constant-volume combustion chamber in which the temperature and pressure were increased by means of a previous combustion event. The phenomena taking place after hydrogen injection were observed through fast image acquisition and characterized by measuring the chamber pressure and temperature. In particular, ignition sites were established. The physical system was also modeled in Ansys Fluent environment, and the injection and mixture formation were simulated in order to evaluate the thermo-fluid dynamic field inside the combustion chamber just before autoignition.

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Effect of Different Combustion Modes on the Performance of Hydrogen Internal Combustion Engines under Low Load

Cited by 4 publications

References 16 publications

Study on combustion and emission characteristics of a micro‐rotary cam internal combustion engine

Study on combustion and emission characteristics of a micro‐rotary cam internal combustion engine

Application of Miller Cycle and Net-Zero Fuel(s) to Diesel Engine: Effect on the Performance and NOx Emissions of a Single-Cylinder Engine

Autoignition Characterization of Hydrogen Directly Injected into a Constant-Volume Combustion Chamber through a Heavy-Duty Injector

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