Paper Information

Journal:   JOURNAL OF APPLIED FLUID MECHANICS (JAFM)   2016 , Volume 9 , Number 2; Page(s) 1013 To 1022.
 
Paper: 

LARGE EDDY SIMULATION OF GDI SINGLE-HOLE AND MULTI-HOLE INJECTOR SPRAYS WITH COMPARISON OF NUMERICAL BREAK-UP MODELS AND COEFFICIENTS

 
 
Author(s):  ZAMANI H., HOSSEINI V.*, AFSHIN H., ALLOCCA L., BALOO M.
 
* MECHANICAL ENGINEERING DEPARTMENT, CENTER OF EXCELLENCE IN ENERGY CONVERSION, SHARIF UNIVERSITY OF TECHNOLOGY, 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.
 
Keyword(s): GASOLINE DIRECT INJECTION (GDI) ENGINE, SINGLE-HOLE AND MULTI-HOLE SPRAY, SPRAY TIP PENETRATION, LARGEEDDY SIMULATION
 
References: 
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