Author/Authors :
zamani، hamed نويسنده Center of Excellence in Energy Conversion,Mechanical Engineering Department,Sharif University of Technology,Tehran,Iran , , hosseini، vahid نويسنده Center of Excellence in Energy Conversion,Mechanical Engineering Department,Sharif University of Technology,Tehran,Iran , , Afshin، Hossein نويسنده Center of Excellence in Energy Conversion,Mechanical Engineering Department,Sharif University of Technology,Tehran,Iran , , Allocca، Luigi نويسنده IstitutoMotori CNR,Napoli,Italy , , Baloo، Mahdi نويسنده Irankhodro Powertrain Company (IPCO),Tehran,Iran ,
Abstract :
In the present study the fuel spray of a gasoline direct injected engine with multi-hole injector is simulated.
Simulation inputs data, injection flow rate and spray cone angle are obtained from previous experimental
studies. Log-normal distribution with different standard deviation is used for initial droplet size as the primary
break-up model in order to reach the agreement between experimental and calculated spray tip penetration. As the first step, only one plume of spray injected into a quiescent air environment is simulated and validated by varying break-up model and standard deviation. Then, with coefficient obtained from the single jet simulation all six spray jets are simulated based on the injector nozzles geometry. The comparison between single-jet simulation and multi-jet simulation shows that validated model coefficients for the single-jet spray cannot be used for multi-jet spray simulation without significant modifications due to adjacent jet interaction and pressure drag. A set of new coefficients for the multi-jet spray is presented
