Effects of engine load on combustion parameters of chicken oil biodiesel –gasoline blends in port fuel injected HCCI engine- An experimental study 2019-01-0952
Low-temperature combustion (LTC) is the individuality of Homogenous charge compression ignition (HCCI) engines where the combustion is achieved at the temperature lower than the temperature at which NOx is formed. By achieving this type of combustion in the engine we can reduce the formation of Thermal NOx and PM. But on the other hand, the combustion parameters of the engine are studied by varying the input parameters of the engine that has been modified to run in Homogenous Charge Combustion Ignition mode. The engine is fueled with the blends of chicken fat oil biodiesel (CFOB) and gasoline. In the present work, the engine is tested for combustion properties such as in-cylinder pressure, heat release rate and rate of pressure rise for different blend ratios. The ignition delay has persistently elevated for an increase in the gasoline concentration in blends. Also, the knock is consistently seen at higher engine loads with the blends of gasoline and diesel as well as gasoline with biodiesel. The pure biodiesel also has a variable increase in peak pressure when compared with diesel. In general, peak pressure varies from 40 to 75 bars for the entire load range of engine operation. The heat release rate of diesel is lower than that of other fuel blends. The start of low-temperature reactions is delayed and their peak values are reduced. At high load conditions, the engine seizes to operate in Homogenous Charge Combustion Ignition mode instead it operates in a conventional pattern which is clearly proved by the heat release curves obtained for the indicated pressure and crank angle data of the particular operating mode of the engine.
Prof. Dr.Ravishankar Sathyamurthy, Prakash N PhD, Chandran Prasad PhD, A. Muthu Manokar PhD
Hindustan Institute of Technology and Sc, B.S. Abdur Rahman Crescent Institute of