Global ETD Search
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Showing 1 to 14 of 14 for “"Detailed chemical kinetics"”.
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Design of a viable homogeneous-charge compression-ignition (HCCI) engine : a computational study with detailed chemical kinetics
… in the engine are caused by extremely rapid chemical energy release. A competing theory asserts that knock is caused by the formation of detonation waves initiated at autoignition centers ('hot-spots') in the engine. No conclusive experimental evidence exists for the detonation theory, but …
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Combustion and pollutant characteristics of IC engines fueled with hydrogen and diesel/hydrogen mixtures using 3D computations with detailed chemical kinetics
… software AVL FIRE coupled with CHEMKIN. The detailed chemical reactions with 29 steps of hydrogen oxidation with additional nitrogen oxidation reactions were also employed. Formation rates of nitrogen oxides (NOx) within the engine were accurately predicted using the extended Zeldovich …
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Tools for modeling reactive materials: detonation initiation and chemical kinetics
… chemistry of a detonation will be studied. The detailed chemical kinetics of a detonation with the reaction products mixing in air will be studied to see what species result from the reaction and what temperature results. The chemical kinetics code described here is a tool under development and …
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Combustion Simulations Using Graphic Processing Units
… platform to solve complex problems involving chemically reacting flows. In the present study, computer programs for combustion simulations with detailed chemical kinetic mechanisms were compiled in the Compute Unified Device Architecture (CUDA) language for NVIDIA GPU architecture. Ignition …
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Effects of curvature and strain on a lean premixed methane-hydrogen-air flame
… equations for the elemental flame incorporating detailed chemical kinetics and transport and a robust and efficient numerical method for solving the governing equations. Hydrogen enrichment of some hydrocarbon fuels has been shown to improve stability and extend flammability limits of lean …
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A study of the physics and chemistry of knock in modern SI engines and their relationship to the octane tests
… engines are boosted and intercooled. Second, detailed chemical kinetics models were used to study fuel autoignition phenomena leading to knocking conditions. These models showed that the fuel autoignition chemistry in modem engine is different from that in the RON and MON tests. Based on these …
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Modelling and simulation of combustion of dilute syngas fuels in a CFR engine
… engine in GT-POWER. Using two-zone modelling and detailed chemical kinetics, the model is also able to determine the performance of the engine along with any associated knocking tendency of the fuel and its corresponding operating conditions. Validation and tuning of the combustion parameters were …
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Effects of operating conditions, compression ratio, and gasoline reformate on SI engine knock limits
… at about 14:1 with a maximum benefit of 6-7%. Detailed chemical kinetics were combined with a cylinder pressure based end-gas modeling methodology to successfully predicted the response of PRFs to compression ratio and air-fuel ratio, and the response of TRFs to boost. The difference between …
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Acceleration of combustion computation fluid dynamics simulations through machine learning
… achieving up to an 18 times speedup in the chemical source term evaluation. Another numerical experiment showed an overall reduction of approximately 30% in computation time. This was achieved by directly replacing the ODE solver for chemical reactions with cost-effective machine learning …
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Coupling of Chemical Kinetics with Computational Fluid Dynamics in a Three-Dimensional Engine Model
… by coupling its fluid mechanics solution with detailed kinetic reactions solved by the chemistry solver, CHEMKIN. As a result, an engine-friendly reaction mechanism for n-heptane was selected to simulate diesel oxidation. Each cell in the computational domain is considered as a …
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Deciphering Biomass Fragmentation using Millisecond Microreactor Kinetics
… science of biomass pyrolysis is still without detailed chemical kinetics and reaction models capable of describing the chemistry and transport in industrial reactors. The primary goal of this thesis was to develop mechanistic insights of biomass pyrolysis with the focus on fragmentation of …
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Autoignition study of next generation aviation fuels and components
… pathways and have unique physical properties and chemical compositions compared to conventional fuels. Deviation in chemical composition and structure could result in different combustion performance, especially in the low temperature regime. This study is focused on evaluating the reactivity of …
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Numerical simulations of ion transport membrane oxy-fuel reactors for CO₂ capture applications
… side of the membrane, driven by the oxygen chemical potential gradient across the membrane at elevated temperature. When a fuel such as methane is introduced into the permeate side as a sweep gas, hydrocarbon oxidation reactions occur by reacting the fuel with the permeated oxygen. The fuel …
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Studies in Advanced Oxy-combustion Technologies
… mixture fraction. Numerical results with detailed chemical kinetics also indicate that C/O ratio space is a fundamental variable in the sense that, for a given fuel, the location of the flame zones and critical reactions is invariant with Zst and strain rate. Two zones are clearly …