M. (Mohamad) Metghalchi
M. (Mohamad) Metghalchi, Y. A. (Yiannis A.) Levendis, M. Reza H. Sheikhi, James C. Keck
Date of Award
Doctor of Philosophy
Department or Academic Unit
College of Engineering. Department of Mechanical and Industrial Engineering.
C1 Hydrocarbon Fuels, Model Order Reduction, Rate-Controlled Constrained-Equilibrium, RCCE
Heat Transfer, Combustion | Mechanical Engineering
This dissertation is focused on an important problem faced in chemical kinetic modelling, that is, model order reduction. The method of Rate-Controlled Constrained-Equilibrium (RCCE) firmly based on the Second Law of Thermodynamics, has been further developed and used for this purpose. The main challenge in RCCE lies in selection of the kinetic constraints. Two classes of problems were looked at: 1) far-from equilibrium problem of ignition and 2) relaxations away from equilibrium due to interactions with the environment.
Regarding the first class, a unified RCCE model for combustion of C1-hydrocarbon fuels (CH4, CH3OH and CH2O) and their corresponding reduced model swere developed. The model is composed of a set of structural constraints controlling the chemical conversion from fuel into combustion products.
For the second class it was shown that a subset of the constraints identified in the first class is able to equally well predict the main features of expansion of combustion products within the power stroke of an internal combustion engine as well as supersonic expansion through a rocket nozzle and also expansion through a heat exchanger as amodel for sudden cooling in gas turbine.
A method based on the degree of disequilibrium of chemical reactions was also suggested for selection of kinetic constraints. This approach has potentials to reduce the level of chemical knowledge required for selection of kinetic constraints and it was shown how the application of this method reproduces the generalized constraints used in the second class of problems without any chemical intuition.
Janbozorgi, Mohammad, "Rate-controlled constrained-equilibrium (RCCE) modelling of C1-hydrocarbon fuels" (2011). Mechanical Engineering Dissertations. Paper 26. http://hdl.handle.net/2047/d20002647
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