An investigation on the causes of cycle variation in direct injection hydrogen fueled engines

Kim, Y.Y.; Lee, Jong T.; Choi, Gyeung Ho

doi:10.1016/j.ijhydene.2004.03.041

Cited by 58 publications

(10 citation statements)

References 10 publications

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“…This suggests that the flame front stability is enhanced with the increase of equivalence ratios while addition of diluent into the hydrogen-air mixtures will decrease the stability of the flame front. This result can explain large cycle-by-cycle variations of the hydrogen engine at the lean mixture operation [26] . This phenomenon can be explained with the classical models of flame instability due to effects of preferential diffusion proposed by Manton et al [27] and Markstein [28] .…”

Section: Laminar Burning Velocity and Markstein Lengthmentioning

confidence: 83%

Measurement of laminar burning velocities and analysis of flame stabilities for hydrogen-air-diluent premixed mixtures

Huang

et al. 2009

Sci. Bull.

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Section: Laminar Burning Velocity and Markstein Lengthmentioning

confidence: 83%

Measurement of laminar burning velocities and analysis of flame stabilities for hydrogen-air-diluent premixed mixtures

Huang

et al. 2009

Sci. Bull.

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“…It is shown that, at the beginning, the hydrogen species still has a limited distribution only at the intake port, which is very intensive with hydrogen. The progress of the diffusion process gradually increases as the crank angle increases [27][28][29]. The effect of the engine speed on the hydrogen species concentration inside the domain of simulation during the intake phase is shown in Figure 5.…”

Section: Variation Of Hydrogen Mass Concentrationmentioning

confidence: 99%

Numerical investigation of in-cylinder flow characteristics of hydrogen-fuelled internal combustion engine

Hamada

Rahman²,

Ramasamy³

et al. 2016

J. Mech, Eng, Sci.

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This paper addresses the computational fluid dynamics (CFD) simulation to investigate the in-cylinder flow characteristics of 2D combustion chamber for a hydrogen-fuelled four-stroke internal combustion engine. CFD simulation has been carried out using commercial CFD codes. The engine speed was varied from 1000 to 3000 rpm, the range of equivalent ratio from 0.6 to 1.0 and the crank angle from 0 to 720 degrees in this study. The effect of the engine speed and equivalence ratio on the flow-field characteristics and volumetric efficiency are investigated in the motoring condition. The increase of engine speed gives a more efficient diffusion process for hydrogen and gives a more homogeneous air-fuel mixture structure. The characteristics of the flow-field are represented by the in-cylinder pressure and temperature distribution as well as the contours of the hydrogen mass fraction for different engine speeds. The acquired results show the maximum in-cylinder temperature and pressure obtained of 650 K and 1.143 MPa at the engine speed of 3000 rpm respectively. It can be seen that the engine speed and equivalence ratio are strongly related to the volumetric efficiency. The results show that the volumetric efficiency increases linearly with increase of the engine speed, but decreases with increase of the equivalence ratio. The results obtained from the simulation can be employed to examine the homogeneity of the air-fuel mixture structure for a better combustion process and engine performance.

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“…Such characteristics play a role to decrease engine cycle variation for the safety of combustion. However, it is frequently observed that the values of cycle variation for hydrogen-fueled engines with direct injection are higher than those of hydrogen-fueled engines with manifold injection or those of gasoline engines, due to a decrease in the mixing period by direct injection in the process of compressing hydrogen (Kim et al, 2005).…”

Section: Hydrogen As An Engine Fuelmentioning

confidence: 99%

Hydrogen in Fueled Systems and the Significance of Hydrogen in Vehicular Transportation

Balat¹

2007

Energy Sources, Part B: Economics, Planning, and Policy

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Hydrogen is not a primary fuel; it must be manufactured from water with either fossil or nonfossil energy sources. Benefits include cleaner air, cleaner water, and better health. Hydrogen can be used as a engine fuel, whereas neither nuclear nor solar energy can be used directly. It has good properties as a fuel for internal combustion engines in automobiles. The main disadvantages of using hydrogen as a fuel for automobiles are huge on-board storage tanks which are required because of hydrogen's extremely low density. Hydrogen will also solve air pollution and planetwarming problems in the future. The combustion of hydrogen does not produce CO 2 , CO, SO 2 , VOC and particles, but entails emission of vapor and NOx.

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An investigation on the causes of cycle variation in direct injection hydrogen fueled engines

Cited by 58 publications

References 10 publications

Measurement of laminar burning velocities and analysis of flame stabilities for hydrogen-air-diluent premixed mixtures

Measurement of laminar burning velocities and analysis of flame stabilities for hydrogen-air-diluent premixed mixtures

Numerical investigation of in-cylinder flow characteristics of hydrogen-fuelled internal combustion engine

Hydrogen in Fueled Systems and the Significance of Hydrogen in Vehicular Transportation

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