Fuel-Air Mixing and Distribution in a Direct-Injection Stratified-Charge Rotary Engine

1989 ◽  
Author(s):  
J. Abraham ◽  
F. V. Bracco
Keyword(s):  
Direct Injection ◽  
Stratified Charge ◽  
Rotary Engine ◽  
Air Mixing

Effect of Injection Timing on Fuel-Air Mixing and Combustion in a Direct Injection Stratified Charge SI Engine

2007 ◽  
Author(s):  
T. Anand Kumar ◽  
J. M. Mallikarjuna ◽  
V. Ganesan
Keyword(s):  
Numerical Study ◽  
Direct Injection ◽  
Combustion Characteristics ◽  
Spark Ignition Engine ◽  
Injection Timing ◽  
Flame Surface ◽  
Si Engine ◽  
Stratified Charge ◽  
Spark Plug ◽  
Air Mixing

This paper describes a numerical study on fuel-air mixing and combustion in a direct injection stratified charge spark ignition engine. The in-cylinder flow, fuel-air mixing and combustion characteristics are investigated in a single cylinder, four-valve, four stoke, direct injection SI engine with pent-roof head and reverse tumble ports. The engine combustion chamber had the side mounted injector and spark plug at the center of pent-roof. Wall guided fuel-air mixing scheme has been adopted. The pre processor code Es-ice, used for dynamic grid generation preparation including description of piston and valve motion. Commercial computational fluid dynamics code Star-CD is used for solving governing equations and post processing of results. Combustion in the present study is simulated using Extended Coherent Flame Model-3z (ECFM-3Z). This model is based on a flame surface density transport equation that can describe inhomogeneous turbulent premixed combustion. In the present study, engine simulations has been carried out from 370 CAD before TDC and upto 90 CAD aTDC. The process includes the closing of the exhaust valves, the whole intake stroke, injection, combustion, and part of expansion. Three different injection timings are simulated viz. 55, 60 and 65 CAD bTDC. For validation of the code predicted results are compared with experimental results available in the literature. It is observed that, injection timing has an important role in mixture preparation and distribution around the spark plug. Hence, for the better combustion characteristics start of injection timing should be optimized.

Numerical investigation of direct injection stratified charge combustion in a natural gas-diesel rotary engine

2019 ◽  
Vol 233-234 ◽  
pp. 453-467 ◽  
Author(s):  
Wei Chen ◽  
Jianfeng Pan ◽  
Yangxian Liu ◽  
Baowei Fan ◽  
Hongjun Liu ◽  
...  
Keyword(s):  
Natural Gas ◽  
Numerical Investigation ◽  
Direct Injection ◽  
Stratified Charge ◽  
Rotary Engine
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