fa سازه Body structure پژوهشي Research <span style="font-size:10pt"><span new="" roman="" style="font-family:" times="">In the present study, different regimes of wall impingement in biodiesel spray were investigated in terms of emissions of diesel engines and performance and the best model for simulating the DI diesel engines fueled by biodiesel blends was presented. As shown by the findings, all aspects of wall impingement were considered in Walljet model, and it properly predicted the fuel droplet size generated by decomposition and penetration. Thus, it is possible to use it for simulating the biodiesel fuel spray atomization at varying engine operating conditions through the adjustment of the model constants.</span></span><br> &nbsp; Spray Wall impingement Exhaust Combustion Biodiesel 4092 4101 http://ase.iust.ac.ir/browse.php?a_code=A-10-637-3&slc_lang=fa&sid=1 Abbas Zarenezhad Ashkezari 180031947532846004011 180031947532846004011 Yes Imam Khomeini Marine Sciences University, Nowshahr, Iran Reza Zirak 180031947532846004012 180031947532846004012 No Islamic Azad University of Sari and Research and Self-Sufficiency Jihad of the IR Navy, Tehran, Iran