<span style="font-family:Verdana;">The objective of this study was to investigate performance characteristics of a spark ignition engine, particularly, the correlation between performance, exhaust gas ...<span style="font-family:Verdana;">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 si</span><span style="font-family:Verdana;">mulation</span><span style="font-family:Verdana;"> results were conducted on a 3-cylinder, four-stroke Volkswagen (</span><span style="font-family:Verdana;">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 </span><span style="font-family:Verdana;">variations in exhaust gas temperatures under test conditions, a basic grid/</span><span style="font-family:Verdana;">mesh generator, K3PREP, was employed to write an itape17 file comprising of a 45</span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;">°</span><span> <span style="font-family:Verdana;">asymmetrical mesh. This was based on the symmetry of the combustion ch</span><span style="font-family:Verdana;">amber of </span><span style="font-family:Verdana;">the engine used in carrying out experimental tests. Simulati</span><span style="font-family:Verdana;">ons were therefore p</span><span style="font-family:Verdana;">erformed based on the input parameters established in</span><span style="font-family:Verdana;"> 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 </span><span style="font-family:Verdana;">with the test data, under the considered test conditions. A percentage error, be</span><span style="font-family:Verdana;">tween experimental results and results from simulations with the kiva4 code of only between 2% to 3% was observed.</span></span></span></span></span>展开更多
文摘<span style="font-family:Verdana;">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 si</span><span style="font-family:Verdana;">mulation</span><span style="font-family:Verdana;"> results were conducted on a 3-cylinder, four-stroke Volkswagen (</span><span style="font-family:Verdana;">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 </span><span style="font-family:Verdana;">variations in exhaust gas temperatures under test conditions, a basic grid/</span><span style="font-family:Verdana;">mesh generator, K3PREP, was employed to write an itape17 file comprising of a 45</span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;">°</span><span> <span style="font-family:Verdana;">asymmetrical mesh. This was based on the symmetry of the combustion ch</span><span style="font-family:Verdana;">amber of </span><span style="font-family:Verdana;">the engine used in carrying out experimental tests. Simulati</span><span style="font-family:Verdana;">ons were therefore p</span><span style="font-family:Verdana;">erformed based on the input parameters established in</span><span style="font-family:Verdana;"> 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 </span><span style="font-family:Verdana;">with the test data, under the considered test conditions. A percentage error, be</span><span style="font-family:Verdana;">tween experimental results and results from simulations with the kiva4 code of only between 2% to 3% was observed.</span></span></span></span></span>
