Technical Paper
Effect of Cetane Number and Fuel Properties on Combustion and Emission Characteristics of an HCCI-DI Combustion Engine Using a Novel Dual Injection Strategy
2015-01-14
2015-26-0023
Homogeneous Charge Compression Ignition (HCCI) combustion was studied as a means of reducing PM and NOx emission simultaneously while maintaining high thermal efficiency and lower fuel consumption. An innovative low cost dual injection strategy is developed to investigate HCCI-DI combustion. This study is focused on the effect of fuel properties and cetane number on HCCI-DI combustion to understand the combustion and emission behavior of a direct injection HCCI engine using double injection strategy with blends of n-heptane and isooctane as fuel. A comparison is also made to understand the behavior and benefits of HCCI-DI combustion over the conventional combustion system. All experiments were carried out at a constant speed of 1350 rev/min and at zero, 15% and 30% of the full load conditions to avoid high knock intensity for high cetane fuel which occurs beyond this operating load condition.
