| The work undertaken aims to determine the effects of fuel injection nozzle parameters on the ignition delay and cetane number as measured using ASTM test method D6890. To determine the effects of fuel injection nozzles on the ignition delay and cetane number, a test plan was developed employing the use of several experimental apparatus. A sample of 15 delay pintle type nozzles and a single typical diesel fuel were chosen for the study.; Each of the 15 nozzles was used to test CF12, a diesel reference fuel, according to ASTM D6890 using an Ignition Quality Tester (IQT(TM)) available from Advanced Engine Technology (AET). An optical spray pattern test rig was developed to analyze the spray pattern of the test nozzles. Internal geometry for each of the nozzles was then characterized in terms of choked flow rates according to ISO 4010 test methods using two test rigs that were designed and developed specifically for this task. Finally, accessible nozzle geometry was measured directly with the aid of a profile projector. All the obtained spray and geometry characteristics of each of the 15 nozzles were then compared to their corresponding ignition delay and cetane number values for examination and discussion. |
