Gas fuel spray simulation of port injection compressed natural gas engine using injector nozzle multi holes

Compressed natural gas (CNG) is the most favorite for fossil fuel substitution. Improvement the new design of the CNG engine injector nozzle holes geometries of the port injection CNG engine can be achieved through increased understanding of the fuel spray process. The objectives of the gas fuel spray simulation of sequential port injection CNG engine using injector nozzle multi holes is to simulate the injector nozzle multi holes injected gas fuel spray effect in combustion chamber of sequential port injection dedicated CNG engine based on variation intake valve lift. The simulations run by Cosmos FloWork, a computation fluid dynamic (CFD) software. The simulation is focused in the 1.78mm, 3.55mm, 5.33mm and 7.1mm intake valve lift. The types of injector nozzles that used are multi holes nozzle such as 2 holes, 3 holes, 4 holes and 5 holes. The detail of the simulation methodology is start from collecting data of the engine until analyze the gas fuel spray phenomenon in combustion chamber. The results are shown that the natural gas fuel flow spray for the original injector nozzle flow is in good condition, but the gas fuel spray is not excellently because the spray is focuses in left and right side of combustion chamber. The new injector nozzle multi holes fuel spray is more excellent than the original, where in the new injector the fuel has spray in spread in the combustion chamber.