Pre- and post-injection flow characterization in a heavy-duty diesel engine using high-speed PIV

High-speed particle image velocimetry (HS-PIV) using hollow microspheres has been applied to characterize the flow in a heavy-duty diesel engine during and after fuel injection. The injection timings were varied in the range representing those used in premixed charge compression ignition (PCCI) regi...

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Bibliographic Details
Published in:Experiments in fluids 2012-09, Vol.53 (3), p.731-746
Main Authors: Zegers, R. P. C., Luijten, C. C. M., Dam, N. J., de Goey, L. P. H.
Format: Article
Language:English
Subjects:
Applied sciences
Charge
Combustion
Combustion chambers
Diesel engines
Energy
Energy. Thermal use of fuels
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Engines and turbines
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fluid- and Aerodynamics
Heat and Mass Transfer
High speed
Particle image velocimetry
Research Article
Sprayers
Sprays
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Summary:High-speed particle image velocimetry (HS-PIV) using hollow microspheres has been applied to characterize the flow in a heavy-duty diesel engine during and after fuel injection. The injection timings were varied in the range representing those used in premixed charge compression ignition (PCCI) regimes, and multiple injections have been applied to investigate their influence on the flow inside the combustion chamber. By injecting into pure nitrogen, combustion is avoided and the flow can be studied long after injection. The results show a sudden change of air motion at the start of injection as a result of the air entrainment at the core of the spray. Furthermore, as expected, spray injection causes a considerable increase in the cycle-to-cycle fluctuations of the flow pattern, the more so for longer injection durations.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-012-1323-3