In-Cylinder Studies of High Injection Pressure Gasoline Partially Premixed Combustion in a Single Cylinder Optical Engine

2015 ◽  
Author(s):  
Pin Lu ◽  
Hua Zhao ◽  
Mohammad Reza Herfatmanesh
Keyword(s):  
Injection Pressure ◽  
Premixed Combustion ◽  
Single Cylinder ◽  
Optical Engine ◽  
High Injection ◽  
Partially Premixed Combustion ◽  
High Injection Pressure ◽  
Partially Premixed

Effects of multiple injection strategies on gaseous emissions and particle size distribution in a two-stroke compression-ignition engine operating with the gasoline partially premixed combustion concept

2018 ◽  
Vol 233 (10) ◽  
pp. 2650-2668 ◽  
Author(s):  
Vicente Bermúdez ◽  
Santiago Ruiz ◽  
Ricardo Novella ◽  
Lian Soto
Keyword(s):  
Particulate Matter ◽  
Size Distribution ◽  
Injection Pressure ◽  
Premixed Combustion ◽  
Gaseous Emissions ◽  
Effective Pressure ◽  
Compression Ignition Engine ◽  
Indicated Mean Effective Pressure ◽  
Partially Premixed Combustion ◽  
Partially Premixed

In order to improve performance of internal combustion engines and meet the requirements of the new pollutant emission regulations, advanced combustion strategies have been investigated. The newly designed partially premixed combustion concept has demonstrated its potential for reducing NOx and particulate matter emissions combined with high indicated efficiencies while still retaining proper control over combustion process by using different injection strategies. In this study, parametric variations of injection pressure, second injection and third injection timings were experimentally performed to analyze the effect of the injection strategy over the air/fuel mixture process and its consequent impact on gaseous compound emissions and particulate matter emissions including its size distribution. Tests were carried out on a newly designed two-stroke high-speed direct injection compression-ignition engine operating with the partially premixed combustion concept using 95 research octane number gasoline fuel. A scanning particle sizer was used to measure the particles size distribution and the HORIBA 7100DEGR gas analyzer system to determine gaseous emissions. Three different steady-state operation modes in terms of indicated mean effective pressure and engine speed were investigated: 3.5 bar indicated mean effective pressure and 2000 r/min, 5.5 bar indicated mean effective pressure and 2000 r/min, and 5.5 bar indicated mean effective pressure and 2500 r/min. The experimental results confirm how the use of an adequate injection strategy is indispensable to obtain low exhaust emissions values and a balance between the different pollutants. With the increase in the injection pressure and delay in the second injection, it was possible to obtain a trade-off between NOx and particulate matter emission reduction, while there was an increase in hydrocarbon and carbon monoxide emissions under these conditions. In addition, the experiments showed an increase in particle number emissions and a progressive shift in the particles size distribution toward larger sizes, increasing the accumulation-mode particles and reducing the nucleation-mode particles with the decrease in the injection pressure and delay in the third injection.

Analysis of the Effects of Injection Pressure Variation in Gasoline Partially Premixed Combustion

2021 ◽  
Author(s):  
Federico Stola ◽  
Vittorio Ravaglioli ◽  
Giacomo Silvagni ◽  
Fabrizio Ponti ◽  
Matteo De Cesare
Keyword(s):  
Injection Pressure ◽  
Pressure Variation ◽  
Premixed Combustion ◽  
Partially Premixed Combustion ◽  
Partially Premixed
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