A Study on the Effects of the Intake Port Configurations on the Swirl Flow Generated in a Small D.I. Diesel Engine  

作　　者：Yungjin Kim Yongtaek Han Kihyung Lee 

机构地区：[1]Department of Mechanical Engineering, Hanyang University

出　　处：《Journal of Thermal Science》2014年第3期297-306,共10页热科学学报（英文版）

基　　金：supported by the research fund of Hanyang University(HY-2012-P)

摘　　要：This paper investigates the effect of intake port configuration on the swirl that is generated within a direct injection(D.I.) diesel engine. The in-cylinder flow characteristics are known to have significant effects on fuel-air mixing, combustion, and emissions. To clarify how to intensify the swirl flow, a swirl control valve(SCV) and a bypass were selected as design parameters for enhancing the swirl flow. The optimal intake port shape was also chosen as a parameter needed to efficiently generate a high swirl ratio. The results revealed that a key factor in generating a high swirl ratio was to control the intake airflow direction passing through the intake valve seat. Further, the swirl intensity was influenced by changing the distance between the helical and tangential ports, and the swirl flow was changed by the presence of a bypass near the intake valve seat. Additionally, the effect of intake port geometry on the in-cylinder flow field was investigated by using a laser sheet visualization method. The experimental results showed a correlation of swirl ratio and mass flow rate. In addition, we found that employing the bypass was an effective method to increase swirl ratio without sacrificing mass flow rate.

关 键 词：helical intake port ISM（impulse swirl meter） swirl ratio intake flow rate PIV（particle image ve-locimetry） HSDI（high speed direct injection） 

分 类 号：TK427[动力工程及工程热物理—动力机械及工程]