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Paper Information

Journal:   JOURNAL OF APPLIED FLUID MECHANICS (JAFM)   2016 , Volume 9 , Number 6; Page(s) 2781 To 2790.
 
Paper: 

APPLYING DIFFERENT STRATEGIES WITH IN OPEN FOAM TO INVESTIGATE THE EFFECTS OF BREAKUP AND COLLISION MODEL ON THE SPRAY AND IN-CYLINDER GAS MIXTURE ATTRIBUTE

 
 
Author(s):  GHADIMI P.*, YOUSEFIFARD M., NOWRUZI H.
 
* DEPARTMENT OF MARINE TECHNOLOGY, AMIRKABIR UNIVERSITY OF TECHNOLOGY, TEHRAN
 
Abstract: 

In the current study, a 3-D numerical simulation of two-phase flow has been conducted in a direct injection CI engine using the Eularian-Lagrangian approach and a new breakup model. The newly modified breakup scheme has been implemented for simulating the ultra-high pressure diesel injection. The effects of droplet breakup and collision model on the spray and in-cylinder gas characteristics have been examined using the open source code Open FOAM. Spray penetration and cone angle are investigated as spray properties and surrounding gas motion are studied by in-cylinder gas velocity and pressure distribution for non-evaporating conditions. In addition, vapor penetration of the evaporating spray is presented to study the effects of current scheme on the evaporating condition. The continuous field is described by RANS equations and dynamics of the dispersed droplet is modeled by Lagrangian tracking scheme. Results of the proposed modified KHRT model are compared against other default methods in Open FOAM and favorable agreement is achieved.
Robustness and accuracy of different breakup schemes and collision models are also verified using the published experimental data. It is demonstrated that the proposed breakup scheme and Nordin collision model display very accurate results in the case of ultra-high pressure injection.

 
Keyword(s): DIESEL SPRAY, ULTRA-HIGH PRESSURE, DROPLET BREAKUP, COLLISION MODEL, OPENFOAM
 
References: 
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