|Title||Kihyun Kim, Donghoon Kim, Yongjin Jung and Choongsik Bae, “Effect of Injector Configuration on Combustion and Exhaust Emission in Direct Injection Compression Ignition Engine Fueled with Gasoline and Diesel at Idle and Low Load Operation,” THIESEL 2012 (Conference on Thermo- and Fluid Dynamic Processes in Direct Injection Engines), Universidad Politecnica de Valencia, Spain, September, 2012.|
Kihyun Kim, Donghoon Kim, Yongjin Jung and Choongsik Bae, “Effect of Injector Configuration on Combustion and Exhaust Emission in Direct Injection Compression Ignition Engine Fueled with Gasoline and Diesel at Idle and Low Load Operation,” THIESEL 2012 (Conference on Thermo- and Fluid Dynamic Processes in Direct Injection Engines), Universidad Politecnica de Valencia, Spain, September, 2012.
The spray and combustion characteristics in a heavy-duty diesel engine fueled using diesel and gasoline were investigated. Engine experiments were performed with five injectors that had different configurations of injection angle and number of nozzle holes. Under widely varied injection timing, the conventional combustion and premixed charge compression ignition combustion were tested with fixed injection quantities.
With the baseline injector with eight holes and an injection angle of 146°, the gasoline combustion required high intake pressure in order to achieve stable engine operation while the diesel combustion was stable even under naturally aspirated condition. For the gasoline combustion, a lower injection pressure was also effective for stable engine operation via the fuel stratification effect which prevents lean mixture beyond the flammability limits. Through the macroscopic spray imaging analysis, the spray penetration and spray cone angle for gasoline were shorter and wider than those for diesel, which implies improved mixing between the fuel and air.
For both fuels and using various injector configurations, it was demonstrated that the injection angle had a much larger effect on the spray and combustion than the number of nozzle holes. In particular, the gasoline combustion demonstrated increased combustion stability as the injection angle decreased. When an injector with a narrow injection angle of 70° was used, the engine operation was stable without high boosting requirements. This resulted from the effect of the fuel stratification. In addition, when injectors with a narrow injection angle were used, the hydrocarbon and carbon monoxide emissions were significantly reduced with improved fuel consumption for both fuels under the premixed charge compression ignition combustion regime. This primarily resulted from the fuel spray being well targeted into piston bowl in order to prevent fuel escaping the bowl lip at early injection timings.
|Previous||Jaeheun Kim, Choongsik Bae and Gangchul Kim, “The Effects of Spark Timing and Equivalence Ratio on Spark-Ignition Linear Engine Operation with Liquefied Petroleum Gas”, SAE Technical Paper 2012-01-0424, presented at 2012 SAE World Congress, Detroit, USA, Apr. 2012.|
|Next||Heechang Oh and Choongsik Bae, “The effect of split injection in a spray guided DISI engine under the lean stratified operation”, to be presented at the 10th International Symposium on Combustion Diagnostics , Baden-baden, Germany, May, 2012|