Cycle-resolved Computations of Stratified-charge and Homogeneous-charge Turbulent Combustion in Direct Injection Engines

2011 ◽  
Author(s):  
Nobuhiro Shinmura ◽  
Kenta Morinaga ◽  
Tatsuro Kiyohara ◽  
Ken Naitoh
Keyword(s):  
Turbulent Combustion ◽  
Direct Injection ◽  
Direct Injection Engines ◽  
Stratified Charge ◽  
Homogeneous Charge

Study of Multimode Combustion System With Gasoline Direct Injection

2006 ◽  
Vol 129 (4) ◽  
pp. 1079-1087 ◽  
Author(s):  
Zhi Wang ◽  
Jian-Xin Wang ◽  
Shi-Jin Shuai ◽  
Yan-Jun Wang ◽  
Guo-Hong Tian ◽  
...  
Keyword(s):  
Fuel Injection ◽  
Direct Injection ◽  
Spark Ignition ◽  
Gasoline Direct Injection ◽  
Compression Ignition ◽  
Combustion System ◽  
Stratified Charge ◽  
Part Load ◽  
Valve Overlap ◽  
Homogeneous Charge

In this paper, a multimode combustion system was developed in a gasoline direct injection engine. A two-stage fuel-injection strategy, including flexible injection timings and flexible fuel quantity, is adopted as a main means to form desired mixture in the cylinder. The combustion system can realize five combustion modes. The homogeneous charge spark ignition (HCSI) mode was used at high load to achieve high-power output density; stratified charge spark ignition (SCSI) was adopted at intermediate load to get optimum fuel economy; stratified charge compression ignition (SCCI) was introduced at transient operation between SI and CI mode. Homogeneous charge compression ignition (HCCI) was utilized at part load to obtain ultralow emissions. Reformed charge compression ignition (RCCI) was imposed at low load to extend the HCCI operation range. In SI mode, the stratified concentration is formed by introducing a second fuel injection in the compression stroke. This kind of stratified mixture has a faster heat release than the homogeneous mixture and is primarily optimized to reduce the fuel consumption. In CI mode, the cam phase configurations are switched from positive valve overlap to negative valve overlap (NVO). The test results reveal that the CI combustion is featured with a high gradient pressure after ignition and has advantages in high thermal efficiency and low NOx emissions over SI combustion at part load.

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