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PIV measurments and analysis of steady in-cylinderflow in tumble plane
KTH, School of Engineering Sciences (SCI), Mechanics.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis the flow that is generated after passage through channels and inlet valveswithin a diesel engine cylinder is examined with the means of Particle Image Velocimetry(PIV). Experiments are carried out by le􀄴ing a thin laser sheet enter into the cylinder frombelow, and with short time intervals take pictures of smoke particles introduced into theair flowing through a given geometric channel shape, via inlet valves and down throughthe cylinder. Three valve lifts were tested and for all valve lifts six sample planes wereused, three parallel to the inlet valves and three orthogonal. Each case were measuredby taking 1500 PIV image pairs of the flow in the cylinder.After pre processing the PIV images they are evaluated by a cross-correlation algorithmwhich evaluates the displacements of the particles within a predetermined interrogationarea in order to find the velocity vector field. For each image pair an instantaneousvelocity field is obtained, and these are then used to calculate the mean velocity fieldof the stationary flow. The measured results are analyzed to find flow structures withinthe flow as well as turbulence properties. An identification scheme to detect tumble ismade in order to find large scale tumble motions as well as a Proper Orthogonal Decomposition(POD) analysis of the center plane for the three valve lifts. The velocity fieldsare found to be sensitive to the valve lift, which is most clearly seen in the difference ofswirl whereas no significant difference can be seen for the tumble motion.

Place, publisher, year, edition, pages
2013. , p. 56
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-202620OAI: oai:DiVA.org:kth-202620DiVA, id: diva2:1078061
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Available from: 2017-03-02 Created: 2017-03-02 Last updated: 2017-03-02Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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