Characteristics of High-Pressure Spray of a Gasoline Direct Injection Injector Under Non-Flash Boiling and Flash Boiling Conditions  

作　　者：王森 徐宏昌 李雪松 袁志远 WANG Sen;XU Hongchang;LI Xuesong;YUAN Zhiyuan(National Engineering Laboratory for Automotive Electronic Control Technology,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]National Engineering Laboratory for Automotive Electronic Control Technology,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2024年第2期230-236,共7页上海交通大学学报（英文版）

基　　金：the National Natural Science Foundation of China(No.52006140)。

摘　　要：The increasingly stringent emission regulations and fuel consumption requirements have elevated the demands of internal combustion engines with higher fuel efficiency and lower emissions.It has been widely demonstrated that fash boiling spray can generate shorter and wider spray with improved atomization and evaporation to promote a better air-fuel mixing process.In this study,macroscopic(far-field)spray morphologies and primary breakup(near-field)characteristics of a two-hole gasoline direct injection injector are investigated under non-flash boiling and flash boiling conditions.High speed macroscopic and microscopic imaging was used to capture the overall spray structure and near-field characteristics,respectively.N-Hexane is used as the test fuel with the injection pressure ranging from 10 MPa up to 40 MPa.For sub-cooled liquid fuel sprays,increasing fuel pressure contributes to enhanced fuel atomization and evaporation.Evident collapses occurred under fare flash boiling conditions,and higher injection pressure weakened this phenomenon since the spray cone angle decreased due to a higher injection velocity.

关 键 词：fash boiling atomization high-pressure injection internal combustion engines optical diagnostics 

分 类 号：TK11[动力工程及工程热物理—热能工程]