운전상태에서의 유동장 및 분무특성에 미치는 분사압력의 영향에 대한 수치해석적 연구 = Numerical Analysis of Effects of Injection Pressure on the Flow Fields and the Spray Characteristics in a Motoring Condition

다국어 초록 (Multilingual Abstract)

Since the combustion in direct injection engines was strongly influenced by the characteristics of flow and spray, an understanding of the characteristics of those was essential to design of the direct injection engines.
In this study the numerical analysis of the effects of injection pressure on the flow fields and the characteristics of spray in a motoring condition was performed using the spray model that could predict the interactions between spray droplets and gas fields. The governing equations were discretised by the finite volume method and the modified k- turbulence model which included the compressibility effects due to the compression/expansion of piston was used.
The results showed that the radially strong inward squish flow or outward reverse-squish flow at the bowl lip was apparent due to the effect of the piston bowl. It was found that as the injection pressure increased, the evaporation rate of droplets was decreased due to the narrow width of spray and the increased number of droplets impinged on the bottom of piston bowl.

목차 (Table of Contents)

• 1. 서 론
• 2. 이론적 모댈
• 3. 수치해석
• 4. 계산결과및 고찰
• 5. 결 론