Modeling and simulation of hydrogen combustion in engines

Смирнов, Н.Н.; Никитин, В. Ф.

doi:10.1016/j.ijhydene.2013.10.097

Cited by 161 publications

(31 citation statements)

References 24 publications

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“…This is related to the parallel computing environment and the numerical method employed . The accumulation of stochastic error is proportional to the number of time steps and depends on the accuracy of the scheme and the approximation error (Smirnov and Nikitin, 2014). Fig.…”

Section: Code Validation and Grid Independency Analysismentioning

confidence: 99%

Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

Huang

Ding

et al. 2016

JZUS-A

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Abstract:An efficient mixing process is very important for the engineering implementation of an airbreathing propulsion system. The air and injectant should be mixed sufficiently before entering the combustor. Two new wall-mounted cavity configurations were proposed to enhance the mixing process in a conventional transverse injection flow field. Their flow field properties were compared with those of a system with only transverse injection ports. Grid independency analysis was used to choose a suitable grid scale, and the mixing efficiencies at four cross-sectional planes (namely x=20, 40, 60, and 80 mm, which are just downstream of the jet orifice) were compared for the configurations considered in this study. The results showed that hydrogen penetrated deeper when a cavity was mounted upstream of the transverse injection ports. This is beneficial to the mixing process in supersonic flows. The mixing efficiency of the configuration with the wall-mounted cavity was better than that of the conventional physical model, and the mixing efficiency of the proposed novel physical model I (98.71% at x=20 mm) was the highest of all. In the case with only transverse injection ports, the vortex was broken up by the strong interaction between the shear layer over the cavity and the jet.

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Section: Code Validation and Grid Independency Analysismentioning

confidence: 99%

Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

Huang

Ding

et al. 2016

JZUS-A

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“…Direct injection can be a beneficial method to utilize hydrogen in engines, as it effectively prevents backfire and increases the possibility of reaching a higher volumetric efficiency since it removes the low H 2 density restriction. There are a number of studies on hydrogen direct injection with experimental [7][8][9][10] and numerical approaches [11][12][13][14]. However, the application of hydrogen injection into noble gases as working fluids instead of air, which can enhance the thermal efficiency, is not well understood.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Heavy Working Fluids on Hydrogen Combustion

Shahsavan¹,

Mack²

2017

Preprint

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Abstract:The thermodynamic efficiency of internal combustion engines is dependent on the compression ratio and specific heat ratio of the working fluid. Using a mixture of oxygen and noble gases instead of air can increase the thermal efficiency due to their higher specific heat ratio. It also has advantage of eliminating NOx caused by lack of nitrogen. In this study, the three dimensional turbulent injection of hydrogen into a constant volume combustion chamber has been modeled and compared to mixtures of oxygen with nitrogen, argon and xenon. All conditions including the mass flow rate of the injected fuel, injection velocity, and initial temperature and pressure of the chamber were kept constant. The results indicate that the hydrogen jet has more penetration length in nitrogen compared to argon and xenon. However, the smaller penetration lengths lead to more complex jet shapes and larger cone angles. In combination with the higher specific heat ratio, combustion in a noble gas environment results in higher temperatures and OH radical concentrations. Furthermore, mixedness is investigated using mean spatial variation and mean scalar dissipation. Hydrogen in argon shows a better mixing rate compared to nitrogen and xenon due to higher diffusivity.

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“…Brayton cycle is adopted in scramjet combustors, and its thermodynamic efficiency is much lower than that of detonation combustion [2] . The inherent theoretical advantage of detonation combustion over deflagrative combustion, has promoted the investigations on advanced propulsion of detonation engines [3][4][5] , and therefore the performance of scramjets might be enhanced greatly if detonation combustion is realized in supersonic combustible mixtures in scramjet 3 combustors.…”

Section: Introductionmentioning

confidence: 99%

Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model

Cai

Liang

Deiterding

et al. 2016

International Journal of Hydrogen Energy

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Although the overdrive degree of the 3D detonation is smaller than that of the 2D case, more complex and irregular detonation fronts can be observed in the 3D case compared with the 2D detonation, which is likely because of the propagation of transverse waves and collisions of triple lines in multi-directions in 3D detonations. After the hot jet is shut down, the newly formed 2D Chapman-Jouguet (CJ) detonation has almost the same characteristic parameters with the corresponding 3D case, indicating that the 2D instabilities can be perfectly preserved in 3D simulations. However, the slapping wave reflections on the side walls in the 3D detonation result in the second oscillation along with the main one, which presents stronger instabilities compared with the 2D case. The inherent stronger 3D instabilities is also verified through the quantitative comparison between the 2D and 3D cases where the 3D result always shows stronger fluctuations than the 2D case.

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Modeling and simulation of hydrogen combustion in engines

Cited by 161 publications

References 24 publications

Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

The Effect of Heavy Working Fluids on Hydrogen Combustion

Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model

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