CFD Model of the Mixture Formation Process of the CNG Direct Injection Engine

2014 ◽  
Author(s):  
Michal Bialy ◽  
Miroslaw Wendeker ◽  
Pawel Magryta ◽  
Zbigniew Czyz ◽  
Rafal Sochaczewski
Keyword(s):  
Formation Process ◽  
Direct Injection ◽  
Cfd Model ◽  
Mixture Formation ◽  
Direct Injection Engine

Effects of High Temperature Fuel on In-Cylinder Fuel Mixture Formation Process for Direct Injection Engine

2003 ◽  
Author(s):  
Kenjiro Nakama ◽  
Eiji Murase ◽  
Masahito Imada ◽  
Jin Kusaka ◽  
Yasuhiro Daisho
Keyword(s):  
High Temperature ◽  
Formation Process ◽  
Direct Injection ◽  
Fuel Mixture ◽  
Mixture Formation ◽  
Direct Injection Engine

Analysis of Mixture Formation Process in a Stoichiometric Direct Injection Gasoline Engine

2003 ◽  
Author(s):  
Koji Matsubara ◽  
Yuta Shima ◽  
Masayoshi Okumi ◽  
Kimihiro Asabatake ◽  
Taketoshi Fujikawa
Keyword(s):  
Formation Process ◽  
Gasoline Engine ◽  
Direct Injection ◽  
Mixture Formation ◽  
Direct Injection Gasoline Engine

3D Numerical Simulation of Stratified Mixture Formation of DI LPG Engine

2013 ◽  
Vol 328 ◽  
pp. 975-980
Author(s):  
Juan Xu ◽  
Zhong Hai Zhou ◽  
Zong Rui Hao ◽  
Bo Yan Xu
Keyword(s):  
Formation Process ◽  
Direct Injection ◽  
Low Carbon ◽  
Power Performance ◽  
Mixture Formation ◽  
Low Carbon Economy ◽  
Rich Mixture ◽  
Optical Engine ◽  
The Rich ◽  
Carbon Economy

Low-carbon economy is a necessary requirement for sustainable development. LPG Direct Injection (DI) method can greatly improve the engines power performance, fuel economy and emission characteristics, hence a new wall-guided combustion system with a specially designed piston cavity used to form lean stratified mixture for DI LPG engine was proposed. In this paper, the stratified mixture formation process of a DI LPG engine was simulated. Before this, the model and method used in the simulation was firstly validated by simulating mixture formation process in an optical engine with conventional piston. The simulation results of the stratified mixture formation showed that, the mixture could gradually move upward along the combustion chamber wall under the guide of the spray induced entrainment vortex and the wall. At the same time, the rich mixture would diffuse to its surroundings. Finally, by the time to ignition, the ignitable stratified lean mixture could be formed.

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.

Sign in / Sign up

Export Citation Format

Share Document