Study of Combustion Characteristics of Spray for Gasoline Direct Injection (GDI) Hot Surface Ignition Heavy Duty Engine

The objective of the present experimental work investigation has been done on the combustion characteristics of the spray, such as ignition delay (ID), duration of burn (DOB) and duration of injection (DOI) for the format of gasoline direct injection (GDI) hot surface ignition heavy duty engine at varying fuel injection pressures (100-200-300 bar) and cylinder air pressures (0 to 25 bar). For the achievement of this purpose, an experimental set-up was fabricated. The set-up employed was a small sample of GDI hot surface ignition heavy duty engine, in which a constant stainless steel cylindrical combustion chamber was used. The experiments were performed base on gasoline and diesel. The results showed that the ID, DOB and DOI strongly depend upon the fuel injection pressure, cylinder air pressure (compression ratio) and equivalence ratio for both fuels. It was found that ID, DOB and DOI for gasoline are higher than diesel. And the minimum value of ID, DOI and DOB have been obtained at the fuel injection pressure of 300 bar compared to 100 and 200 bar for both fuels .It was also found that increasing the DOI causes to increase DOB and decrease the ID for both fuels. It was observed that with increasing the ID of gasoline until 10 ms, the DOB also increased due to more time available for mixing the fuel and air. But after 10 ms delay time, the DOB decreased. For diesel, the best delay time was obtained 9 ms to achieve maximum DOB and after this time, that decreased.