Pre-integrated non-equilibrium combustion-response mapping for internal combustion engine emissions

Chung, Nguyen Thai (2004) Pre-integrated non-equilibrium combustion-response mapping for internal combustion engine emissions. PhD thesis, University of Glasgow.

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Abstract

This study establishes a novel method to predict emissions in internal combustion (IC) engines. The method couples a multi-dimensional engine modeling program with pre-integrated non-equilibrium chemical kinetic reaction results. Prior to engine simulation, detailed chemical kinetic reactions of air/fuel mixtures at different temperatures, pressures, and compositions, which possibly occur in the IC engine, are calculated using SENKIN, a subprogram in CHEMKIN-II computer package [1]. The reaction results are decoupled from their chemical eigenvalue (order of about 10-10s) then integrated and saved in physical timescale (order of about 10-5 s) in a database file. In the database, reaction results of different initial conditions (temperature, pressure, and composition) are stored in different zones; the zones are indexed using their respective reaction conditions. In the modeling process, fluid and thermal dynamics, movement of piston and valves, and spray droplets interaction are simulated by KIVA-3V [2] using the finite- volume technique. During combustion of the air/fuel mixture, instead of calculating directly the non-equilibrium chemical reactions, reaction results are obtained from the database file. KIVA-3V sends a request, with inputs of temperature, pressure, composition, and reaction time of combustible mixture to an interpolating subroutine. This interpolating subroutine uses these reaction conditions as indices to lookup the requested results in the database file, then returns temperature, heat release, and species concentrations after reaction to the main program. The approach avoids direct time consuming calculation of detailed chemical reactions as well as the errors introduced by coupling the physical and chemical processes. which have different eigenvalues. The required computational effort is shortened. Emissions are predicted accurately since reaction of air/fuel mixture is calculated using the detailed kinetics mechanism. The database file for each fuel must be generated once, and can be used for any application which requires chemical reactions of this fuel. The approach is applied to model a Caterpillar 3401 direct injection (DI) compression ignition (C1) Diesel engine, a Rover K4 methane-fuelled spark ignition (SI) engine, a Ricardo E6 co-operative fuel research (CFR) SI gasoline engine, and a Toledo 1500 four-stroke SI gasoline engine. Predicted results agree well with the experimental data.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Additional Information: Adviser: Theodosios P Korakianitis
Keywords: Mechanical engineering
Date of Award: 2004
Depositing User: Enlighten Team
Unique ID: glathesis:2004-71438
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 10 May 2019 14:40
Last Modified: 10 May 2019 14:40
URI: http://theses.gla.ac.uk/id/eprint/71438

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