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- W623903721 abstract "The in-cylinder combustion dynamics of spark-ignition (SI) engines involves a complexinteraction of physical and chemical processes. Despite significant progress In thenumerical simulation of these phenomena with computational fluid dynamics (CFD),there is a need for generalised models to describe the emission, absorption and scatteringof thermal radiation within the 'participating' combustion gases. Therefore, the presentwork advances the predictive capability of nurnerical methods for radiation transport inparticipating media for inclusion into an established finite-volume CFD code.The research focuses on three radiation methods: discrete transfer, YIX and a pathlengthbasedMonte Carlo algorithm. The three-dimensional formulation and coding of eachmethod combines the best available knowledge from heat transfer, statistical and graphicsliterature. In particular, the tracing and searching of complex arbitrary geometries utilisesan efficient ray-triangle intersection algorithm in a novel way to handle cell face distortionand edge intersections with minimum computation. A new general weighted-sum-ofgray-gases model (WSGG) is implernented in order to first resolve the spectral (nongray)dependence of high-temperature gas radiative properties prior to solution by one of thethree radiation methods.The present methods are first verified against published benchmark solutions for radiatingmedia in the absence of other modes of heat transfer. Subsequently, the discrete transfer-WSGG model is coupled with the engine-specific CFD code KIVA-11 for studies of theflow field, flame propagation and infrared emission in pancake and pentroof SI engines.Here, the Favre-averaged Navier-Stokes, energy and radiation conservation equations aresolved over a nonorthogonal, curvilinear mesh of arbitrary hexahedrons, body-fitted to thecombustion chamber geometry. Flexible algebraic and elliptic mesh generation tools aredeveloped for this purpose. Additional k-F- turbulence terms for variable density flows,the EDC model for mixing-controlled combustion, the Shell model for auto-ignition andthe capability to simulate ports and valves with wave action are new features added toKIVA-11 to ensure a good description of the turbulent, chemically reacting flow field as abasis for the radiation studies. Comparisons with experimental measurements from opticalengine studies are presented." @default.
- W623903721 created "2016-06-24" @default.
- W623903721 creator A5015951468 @default.
- W623903721 date "1998-01-01" @default.
- W623903721 modified "2023-09-24" @default.
- W623903721 title "Numerical simulation of spark ignition engines with special emphasis on radiative heat transfer" @default.
- W623903721 hasPublicationYear "1998" @default.
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