Variables
설정
global edge length
5 mm
maximum aspect ration
24.265
input parameter minimum
5
remesh area-gate
10mm(?)
no.of channels
8
distance bet.channel centers
30mm
distance to extend beyond part
150mm
channel diameter
10mm
far above and below the circuit
20mm
filling control
-injection time
1s
velocity/pressure switch over
-By % volume filled
99%
velocity를 갖게 되기 때문에 더욱 강한 tumble motion을 만들 수 있게 되었다.
GDI 엔진에서 성층화 연소가 가능하기 위해서는 혼합기체에 점화가 잘 일어나게 하기 위해서 spark plug 주변의 공기가 좀더 농하게 되도록 연료를 잘 분사해주어야 한다. 그리고 나중에 좀더 자세하게 설명할 부분인 late injection에
Investigate the relationship
between flow condition and
fluid velocity in order to
understand Reynolds
number in flow dynamics
A. Shear Stress
B. Viscous & Inertia Force
C. Reynolds Number
D. Laminar & Turbulent Flow
E. Type of flow
Shear stress slow down the motion so that the velocity close to the wall will reduce
→ velocity gradient (dy/dx)
Figure 13 shows that cryo pump is cooling pump. It means this pump is cooling, liquefaction and store air, not pumping. Generally, it has 3 processes like condensation, absorption and trap at low temperature. The cooled air or molecules do not have any momentum so it is no possibility to heat any molecules. It means vacuum.
Cryo pump have High emission velocity and high emission capacity so it