The objective of this study was to investigate performance
characteristics of a spark ignition engine, particularly, the correlation
between performance, exhaust gas temperature and speed, using Kiva4. Test data
to validate kiva4 simulation results were
conducted on a 3-cylinder, four-stroke Volkswagen (VW) Polo 6 TSI 1.2
gasoline engine. Three different tests were, therefore, carried out. In one
set, variations in exhaust gas temperature were studied by varying the engine
load, while keeping the engine speed constant. In another test, exhaust gas
temperature variations were studied by keeping the engine at idling whilst
varying the speeds. A third test involved studying variations in exhaust gas
temperature under a constant load with variable engine speeds. To study variations in exhaust gas temperatures under test
conditions, a basic grid/mesh generator, K3PREP, was employed to write
an itape17 file comprising of a 45°asymmetrical mesh. This was based on
the symmetry of the combustion chamber of the engine used in carrying out experimental tests. Simulations
were therefore performed based on the input
parameters established in the conducted tests. Simulations with the
kiva4 code showed a significant predictability of the performance
characteristics of the engine. This was evident in the appreciable agreement
obtained in the simulation results when compared with the test data, under the considered test conditions. A percentage
error, between experimental results and results from simulations with
the kiva4 code of only between 2% to 3% was observed.
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