Investigation of the Interaction of Charge Motion and Residual Gas Concentration in an Optically Accessible SI Engine

2013 ◽  
Author(s):  
Thomas Mederer ◽  
Michael Wensing ◽  
Alfred Leipertz
Keyword(s):  
Charge Motion ◽  
Si Engine ◽  
Gas Concentration ◽  
Residual Gas

scholarly journals Ethylene oxide sterilization of bone grafts: Residual gas concentration and fibroblast toxicity

1994 ◽  
Vol 65 (6) ◽  
pp. 640-642 ◽  
Author(s):  
Takeshi Arizono ◽  
Yukihide Iwamoto ◽  
Kiyotaka Okuyama ◽  
Yoichi Sugioka
Keyword(s):  
Ethylene Oxide ◽  
Bone Grafts ◽  
Gas Concentration ◽  
Residual Gas ◽  
Ethylene Oxide Sterilization

Nitrogen and Argon in Borosilicate Glass: Solubility, Diffusivity, Residual Gas Concentration and Behaviour of Bubbles in Glass Melts, Containing Both Gases

2008 ◽  
Vol 39-40 ◽  
pp. 437-442 ◽  
Author(s):  
Detlef Köpsel ◽  
Markus Booβ ◽  
M. Opyd ◽  
Maria Louisa Aigner
Keyword(s):  
High Temperature ◽  
Gas Exchange ◽  
Borosilicate Glass ◽  
Diffusion Coefficients ◽  
Molten Glass ◽  
Extraction Method ◽  
Vacuum Extraction ◽  
Glass Melts ◽  
Gas Concentration ◽  
Residual Gas

Diffusivities of nitrogen and argon in a borosilicate glass were determined with two different methods: (1) from gas exchange experiments between molten glass and bubbles containing nitrogen and argon, and (2) from solution rates of nitrogen and argon in glass during saturation experiments. Between 1200°C and 1580°C the diffusion coefficients of nitrogen and argon yielded the following equations:      − = − RT s m DN 134900 exp 10 22 . 1 ] / [ 6 . 2 2 and      − = − RT s m DAr 125300 exp 10 08 . 1 ] / [ 6 . 2 , with R=8.314 J/(mol.K). The solubilities and residual gas concentration in the glass which are necessary for the calculation of the diffusivities were determined with the high temperature vacuum extraction method.

A Comparison of Modeled and Measured 3-D In-Cylinder Charge Motion Throughout the Displacement of a Four-Valve SI Engine

2000 ◽  
Author(s):  
Hans G. Hascher ◽  
Harold J. Schock ◽  
Oshin Avanessian ◽  
James Novak
Keyword(s):  
Charge Motion ◽  
Si Engine

The 3-D In-Cylinder Charge Motion of a Four-Valve SI Engine under Stroke, Speed, and Load Variation

2000 ◽  
Author(s):  
Hans G. Hascher ◽  
Mark Novak ◽  
Tom Stuecken ◽  
Harold J. Schock ◽  
James Novak
Keyword(s):  
Charge Motion ◽  
Si Engine ◽  
Load Variation

A Numerical Simulation of Analysis of Backfiring Phenomena in a Hydrogen-Fueled Spark Ignition Engine

2016 ◽  
Vol 138 (10) ◽  
Author(s):  
K. A. Subramanian ◽  
B. L. Salvi
Keyword(s):  
Greenhouse Gas Emission ◽  
Hot Spot ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Intake Manifold ◽  
Injection Timing ◽  
Si Engine ◽  
Engine Operation ◽  
Study Results ◽  
Residual Gas

Hydrogen utilization in spark ignition (SI) engines could reduce urban pollution including particulate matter as well as greenhouse gas emission. However, backfiring, which is an undesirable combustion process of intake charge in hydrogen-fueled SI engine with manifold-based injection, is one of the major technical issues in view of safety of engine operation. Backfiring occurs generally during suction stroke as the hydrogen–air charge interacts with residual gas, resulting in flame growth and propagation toward upstream of engine's intake manifold, resulting in stalling of engine operation and high risk of safety. This work is aimed at analysis of backfiring in a hydrogen-fueled SI engine. The results indicate that backfiring is mainly function of residual gas temperature, start of hydrogen injection timing, and equivalence ratio. Any hot-spot present in the cylinder would act as ignition source resulting in more chances of backfiring. In addition to this, computational fluid dynamics (CFD) analysis was carried out in order to assess flow characteristics of hydrogen and air during suction stroke in intake manifold. Furthermore, numerical analysis of intake charge velocity, flame speed (deflagration), and flame propagation (backfiring) toward upstream of intake manifold was also carried out. Some notable points of backfiring control strategy including exhaust gas recirculation (EGR) and retarded (late) hydrogen injection timing are emerged from this study for minimizing chance of backfiring. This study results are useful for development of dedicated SI engine for hydrogen fuel in the aspects of elimination of backfiring.

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