Journal ArticleDOI
Directions in internal combustion engine research
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This article is published in Combustion and Flame.The article was published on 2013-01-01. It has received 534 citations till now. The article focuses on the topics: Hydrogen internal combustion engine vehicle & External combustion engine.read more
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Chemical Kinetics and Propagation Dynamics of Laminar and Turbulent Flames
Abstract: Recognizing the fundamental and practical importance of premixed flames in combustion research, the present dissertation consists of a series of studies on the chemical kinetics and propagation dynamics of both laminar and turbulent flames. First, starting with the relatively simple but fundamental configuration of the laminar unstretched flames propagating in quiescent environments, the laminar flame speeds of hydrogen flames have been measured, to validate and improve the corresponding kinetic models. Based on the updated model, the analysis on the kinetic networks shows the opposing role of the reaction H+O2(+M) = HO2(+M) under different conditions. Then, the dynamics of laminar flame propagation have been studied; On one hand, in a local perspective, the collision of flames has been studied with the emphasis on the dynamics and flow pattern of the flame corners generated. It is demonstrated that the flame corners are controlled by the interaction of preferential diffusion and kinematic restoration, generating the vortices of considerable strength relative to the turbulent eddies. On the other hand, in a global perspective, we have looked into the evolution of cellular instabilities, including hydrodynamic and diffusional-thermal modes. The influence of preferential diffusion as well as thermal expansion, on the onset of the instability and acceleration of flame propagation, has been studied. Next, in light of the knowledge of laminar flames, the turbulent flames have been studied thereafter recognizing the effect of hydrodynamic instability. A scaling analysis has been performed on the interaction between the growth of hydrodynamic cells and the wrinkles by the turbulent eddies, within different regimes in the turbulent flame regime diagram. The turbulent flame speeds have been measured experimentally, and subsequently compared with their scaling law under various conditions with the diffusionally neutral mixtures. Furthermore, we shall demonstrate the essential role of the molecular preferential diffusion in the structure and propagation of turbulent flames. It will be demonstrated that due to preferential diffusion, the mixtures, whose concentrations are near or beyond the conventional flammability limits, can be rendered to burn strongly in turbulence, with distinctive finger-shape structures on iii the flame surfaces. Finally, the key remarks in this dissertation have been summarized, with recommendations for further explorations on the study of laminar and turbulent premixed flames.
Proceedings ArticleDOI
Application of an Ozone Generator to Control the Homogeneous Charge Compression Ignition Combustion Process
Journal ArticleDOI
A ‘smart’ fuel of photochemically-controlled reactivity
TL;DR: In this article, a "smart" fuel whose molecular structure can be adapted via irradiation with light in the presence of air was calculated to provide control over ignition timing in a homogeneous charge compression ignition (HCCI) engine.
Journal ArticleDOI
Fuel consumption of free-swimming school versus FAD strategies in tropical tuna purse seine fishing
TL;DR: In this article , the authors show the activity and energy patterns of a Spanish tuna purse seiner operating in the tropical Indian Ocean, based on the monitoring of energy consumption over 10 consecutive fishing trips.
References
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Proceedings ArticleDOI
High Combustion Temperature for the Reduction of Particulate in Diesel Engines
TL;DR: In this paper, the effects of temperature T and equivalence ratio Φ on soot formation at high pressures up to 5 MPa were investigated in a diesel engine and the trajectory in relation to both soot and NO formation region gives suggestion of a possibility of high temperature mixture combustion to reduce particulate formation in diesel engines.
Journal ArticleDOI
Numerical study on the low emission window of homogeneous charge compression ignition diesel combustion
Sungwook Park,Rolf D. Reitz +1 more
TL;DR: In this article, a numerical study of the low emission window (lower than 10 grams/kg-f CO, 10g/kgf HC, 0.5 grams/ kg-f NO and almost soot-less) of diesel HCCI combustion was performed over wide ranges by changing equivalence ratio, inlet temperature, intake valve closure timing, engine speed and fuel amount.
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Investigation of the Roles of Flame Propagation, Turbulent Mixing, and Volumetric Heat Release in Conventional and Low Temperature Diesel Combustion
Sage L. Kokjohn,Rolf D. Reitz +1 more
TL;DR: In this paper, a multi-mode combustion model that combines a comprehensive kinetics scheme for volumetric heat release and a level-set-based model for turbulent flame propagation is applied over the range of engine combustion regimes from non-premixed to premixed conditions.