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Optical analysis of diesel sprays
1997 (English)Conference paper, Published paper (Other academic)
Abstract [en]

An advanced control system to enable systematic photographic studies of diesel injections has been developed. The system automatically generates series of photos under predefined conditions. The injections are made in a pressurized vessel. The temperature in the vessel is variable between 30 °C and 100 °C and the gas pressure between 0.1 MPa and 5 MPa. The entire system is controlled by a computer, and therefore the safety level is very high when performing experiments under extreme conditions. During the injection sequence the system can be remote controlled from another computer. The timing of the image acquisition is adjustable with an accuracy of 1 µs. Up to four separate flashes can be used to achieve multiple exposures of the film. The four flashes can also be fired simultaneously in order to increase the optical energy in the flash. When using double exposure at a low level of optical magnification the spray tip velocity can be determined. If the double exposure facility is used in conjunction with a high magnification the droplet speed can be measured.

The system has been used to study the spray penetration into air at 60 °C and 4.2 MPa. The air density corresponds to full load conditions in a direct injected 2 liter per cylinder heavy duty diesel engine. The peak injection pressure was 120 MPa. To minimize the influence of cycle to cycle variations the median values of several images have been used. The results have been compared with computer simulations. Droplet volume distributions and velocities, with double exposure technique, have been studied under the same ambient conditions.

Place, publisher, year, edition, pages
1997.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-242783OAI: oai:DiVA.org:kth-242783DiVA, id: diva2:1284676
Conference
Nutek
Note

QCR 20190215

Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-02-15Bibliographically approved

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