Study of Air Flow Interaction with Pilot Injections in a Diesel Engine by means of PIV Measurements

Paper #:
  • 2017-01-0617

Published:
  • 2017-03-28
Abstract:
With ever-demanding emission legislations in CI engines, new premixed combustion strategies have been developed in recent years seeking both, emissions and performance improvements. Since it has been shown that in-cylinder air flow affects the combustion process, and hence the overall engine performance, the study of swirling structures and its interaction with fuel injection are of great interest. In that regard, possible Turbulent Kinetic Energy (TKE) distribution changes after fuel injection might be a key parameter for achieving performance improvements by reducing heat transfer. Consequently, this paper aims to gain insight into spray-swirl interaction through the analysis of in-cylinder velocity fields measured by means of Particle Image Velocimetry (PIV) when PCCI conditions are proposed. Experiments are carried out in a single cylinder optical Diesel engine with bowl-in-piston geometry. A standard 2D PIV system is used for measuring instantaneous velocity fields in a cross section inside the combustion chamber. The test matrix is based on single event advanced pilot injections with energizing time and injection pressure sweeps at different crank angle positions. Results show that the spray-swirl interaction impacts the swirl ratio with a tendency to decrease it when higher amount of fuel are injected. This tendency also comes with a homogenization of the flow field that in addition with lower swirl ratios might decrease heat transfer to cylinder walls
Also in:
  • SAE International Journal of Engines - V126-3EJ
  • SAE International Journal of Engines - V126-3
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