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Droplet Velocities in a Sliced Diesel Spray
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.ORCID iD: 0000-0001-9483-7992
2001 (English)Conference paper (Refereed)
Abstract [en]

This paper gives a summary of particle image velocimetry (PIV) measurements performed in a sliced diesel spray. The slicing of the spray was necessary to achieve good image quality in the more dense regions of the spray. The images were double exposed to allow auto-correlation based velocimetry. The exposure time of each exposure was 100 ns, as that was the shortest possible exposure with the camera used. The illumination was achieved with a flashlight located at the opposite side of the spray, consequently the droplets were visible as dark shadows. The long exposure time limited the possibilities to measure high velocities, and therefore the velocities in the very rapidly moving spray core could not be measured, as the images were smeared out in the direction of the velocity. The resulting velocities were compared to velocities in the corresponding unsliced spray in the points where both sprays gave velocity data. The results were also compared with computer simulations. Some disagreements were found, and possible reasons for these are discussed.

Place, publisher, year, edition, pages
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-181480OAI: diva2:899517
Seventeenth Annual Conference of ILASS-Europe, Zürich, September 2001.

NR 20160224

Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2016-02-24Bibliographically approved

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Cronhjort, Andreas
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Internal Combustion Engines
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