Lean Burn Combustion Influence on Stratified Charge Ethanol Direct Injection Engine

2016 ◽  
Author(s):  
Rafael Lara Franco ◽  
Roberto Berlini da Costa ◽  
Carlos Alberto Gomes Júnior ◽  
Fernando Antonio Rodrigues Filho ◽  
Ramon Molina Valle
Keyword(s):  
Direct Injection ◽  
Lean Burn ◽  
Stratified Charge ◽  
Direct Injection Engine

The Research of Lean Combustion Characteristic of Compound Injection System of Direct Injection Engine

2014 ◽  
Vol 532 ◽  
pp. 362-366 ◽  
Author(s):  
Jiang Feng Mou ◽  
Rui Qing Chen ◽  
Yi Wei Lu
Keyword(s):  
Gasoline Engine ◽  
Direct Injection ◽  
Injection System ◽  
Intake Manifold ◽  
Combustion Characteristic ◽  
Injection Timing ◽  
Mixed Gas ◽  
Lean Burn ◽  
Direct Injection Engine ◽  
Lean Combustion

This paper studies the lean burn limit characteristic of the compound injection system of the direct-injection gasoline engine. The low pressure nozzle on the intake manifold can achieve quality homogeneous lean mixture, and the direct injection in the cylinder can realized the dense mixture gas near the spark plug. By adjusting the two injection timing and injection quantity, and a strong intake tumble flow with special shaped combustion chamber, it can produces the reverse tumble to form different hierarchical levels of mixed gas in the cylinder. Experimental results show: the compound combustion system to the original direct-injection engine lean burn limit raise 1.8-2.5 AFR unit.

Numerical Study to Achieve Stratified EGR in Engines

2002 ◽  
Author(s):  
Bassem H. Ramadan ◽  
Charles L. Gray ◽  
Harold J. Schock ◽  
Fakhri J. Hamady ◽  
Karl H. Hellman
Keyword(s):  
Numerical Study ◽  
Direct Injection ◽  
Fuel Mixture ◽  
Combustion Engines ◽  
Lean Burn ◽  
Complete Combustion ◽  
Stratified Charge ◽  
Automotive Emissions ◽  
Si Engines ◽  
Inlet Manifold

Exhaust Gas Re-circulation (EGR) has been used in intemal combustion engines to control automotive emissions. EGR is usually used to dilute the inlet charge, which consists of air, by redirecting part of the exhaust into the inlet manifold of the engine. This results in a reduction of the oxygen mass fraction in the inlet charge. However, dilution of the air-fuel mixture in an engine using stratified EGR could offer significant fuel economy saving comparable to lean burn or stratified charge direct-injection SI engines. The most critical challenge is to keep the EGR and air-fuel mixture separated, or to minimize the mixing between the two zones to an acceptable level for stable and complete combustion. Swirl-type stratified EGR and fuel-air flow structure is considered desirable for this purpose, because the circular shape of the cylinder tends to preserve the swirl motion. Moreover, the axial piston motion has minimal effect on the swirling motion of the fluid in the cylinder. In this study, we consider intake system design in order to generate a two-zone combustion system, where EGR is maintained in a layer on the periphery of the cylinder, and the fuel-air mixture is maintained in the center of the cylinder. KIVA-3V was used to perform numerical simulations on different EGR systems. The simulations were performed to determine if the two-zones can be generated in the cylinder, and to what extent mixing between the two zones occurs. For the engine geometries considered in this study, the results showed that it is possible to generate the two zones, but mixing is difficult to control.

scholarly journals Evaluation of EGR applicability for NOx reduction in lean-burn LPG direct injection engine

2015 ◽  
Vol 19 (4) ◽  
pp. 22-28
Author(s):  
Cheolwoong Park ◽  
Seehyeon Cho ◽  
Taeyoung Kim ◽  
Gyubaek Cho ◽  
Janghee Lee
Keyword(s):  
Direct Injection ◽  
Lean Burn ◽  
Direct Injection Engine
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