Study of correlation between fuel spray characteristics and atomization mode under air cross-flow in an engine cylinder

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420114
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Hiroshima University
• Principal Investigator: Ogata Yoichi 広島大学, 工学研究院, 准教授 (10323792)
• Co-Investigator(Renkei-kenkyūsha): NISHIDA KEIYA 広島大学, 大学院工学研究院, 教授 (90156076) ; SHI BAOLU 広島大学, 大学院工学研究院, 助教 (30648027)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 微粒化 / 噴霧特性

Outline of Final Research Achievements

Effects of uniform cross flow and ambient pressure on fuel spray characteristics such as break-up in DISI gasoline engine are investigated. A wind tunnel in which ambient pressure can be changed from atmospheric pressure to high pressure is used to take compression as well as expansion stage into consideration.
It is found that vertical spray tip penetration decreases, while horizontal penetration increases and spray is strongly bent by cross-flow and horizontal velocity increases with fluctuation of a wavelength and a period toward spray downstream, with increasing ambient pressure. An empirical equation of spray distortion is suggested using the liquid to air momentum flux ratio as the key parameter to determine spray distortion. The equation almost agrees with experiments, thus, spray behavior in cross flow can be predicted by the momentum flux ratio.

Free Research Field

流体工学