Optimization of the Mixture Formation Process by Split Injection in a Gasoline Direct Injection Engine for Two-Wheel Applications

2010 ◽  
Author(s):  
U. Sorge ◽  
M. Costa ◽  
L. Allocca
Keyword(s):  
Formation Process ◽  
Direct Injection ◽  
Gasoline Direct Injection ◽  
Mixture Formation ◽  
Split Injection ◽  
Direct Injection Engine ◽  
Gasoline Direct Injection Engine

Effects of throat area and inlet area of intake port on mixture formation of gasoline direct injection engines

2018 ◽  
Vol 233 (5) ◽  
pp. 1150-1161
Author(s):  
Zhaolei Zheng ◽  
Hanyu Liu ◽  
Xuefeng Tian
Keyword(s):  
High Speed ◽  
Ignition Time ◽  
Direct Injection ◽  
Fuel Mixture ◽  
Flow Coefficient ◽  
Gasoline Direct Injection ◽  
Intake Port ◽  
Mixture Formation ◽  
Direct Injection Engine ◽  
Gasoline Direct Injection Engine

To study the effects of intake port structure parameters (inlet area and throat area) of a gasoline direct injection engine on mixture formation, a steady-flow test and transient simulation with four kinds of intake ports (named Cases 1–4) were simulated using AVL FIRE; a four-valve, four-cylinder gasoline direct injection engine with Case 1 was also operated under wide-open-throat conditions with a speed of 5500 r/min as the test basis. According to the simulation results, the flow coefficient increased with an increase in throat and decrease in inlet areas; however, a reverse change of them can improve the tumble ratio. In addition, the tumble ratio in a cylinder can be increased by reducing the throat and inlet areas. However, the concentration is not notable at high-speed wide-open-throat conditions. A larger tumble ratio and stronger turbulent kinetic energy intensity of in-cylinder flow are beneficial to form a homogeneous mixture, which ensures a better distribution of air–fuel mixture at ignition time. Moreover, larger inlet area and smaller throat area ensure less NO emissions.

Combustion System Optimization of a Gasoline Direct Injection Engine

2011 ◽  
Vol 354-355 ◽  
pp. 419-428
Author(s):  
Li Yan Feng ◽  
Chun Hua Zhang ◽  
Jiang Ping Tian ◽  
Wu Qiang Long ◽  
Jun Li ◽  
...  
Keyword(s):  
Fuel Injection ◽  
Direct Injection ◽  
System Optimization ◽  
Gasoline Direct Injection ◽  
Combustion System ◽  
Charge Motion ◽  
Mixture Formation ◽  
Direct Injection Engine ◽  
Gasoline Direct Injection Engine ◽  
Optimal Injection

With the purpose of optimizing the combustion system of a homogeneous charged gasoline direct injection engine, its working process was simulated with a 3-D CFD software package. The authors investigated the influence of injection timings and combustion chamber shapes on the charge motion, fuel injection and their influence on fuel-air mixture formation. With the comparisons of fuel-air mixture quality and combustion processes between two typical injection timings, the optimal injection strategy was chosen. To further improve the mixture quality, configuration on piston crown was optimized and analysis on mixture formation processes of the new configurations was made. Simulation results indicate that the new configurations have faster fuel evaporation rate and better mixture homogeneity.

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