A Study on the Combustion Characteristics of Dieseline Blend in HCCI Engines

A computational fluid dynamics (CFD) study has been carried out to analyse the performance of gasoline and diesel blends under homogeneous charge compression ignition (HCCI) engine conditions. A sector model of 60° has been implemented to capture the in-cylinder combustion process. Effect of air–fuel ratio (50, 55, 60, 70 and 80) and various gasoline contents (50%, 60%, 70% and 80%) on the combustion characteristics of the engine operating under HCCI engine conditions have been studied. CFD results predicted using the tool STAR-CD have been validated with the measured experimental values available in the literature. Progress variable model multi-fuel (PVM-MF) has been implemented as the combustion model. The pressure and temperature curves obtained from the simulation results are presented. From the results, it can be seen that the gasoline content and air–fuel ratio are inversely proportional. High gasoline content cases show that the air–fuel ratio must be maintained low in order to obtain combustion of the charge itself. Lower gasoline content portrays that the engine can be operated under lean conditions, and their behaviour is similar to a current diesel operation.