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Studies on microscopic structure of diesel sprays under atmospheric and high gas pressures

Deshmukh, D and Ravikrishna, RV (2014) Studies on microscopic structure of diesel sprays under atmospheric and high gas pressures. In: INTERNATIONAL JOURNAL OF SPRAY AND COMBUSTION DYNAMICS, 6 (2). pp. 199-219.

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Official URL: http://dx.doi.org/10.1260/1756-8277.6.2.199

Abstract

In the present work, the spray structure of diesel from a 200-mu m, single-hole solenoid injector is studied using microscopic imaging at injection pressures of 700, 1000 and 1400 bar for various gas pressures. A long-distance microscope with a high resolution camera is used for spray visualization with a direct imaging technique. This study shows that even at very high injection pressures, the spray structure in an ambient environment of atmospheric pressure reveals presence of entangled ligaments and non-spherical droplets during the injection period. With increase in the injection pressure, the ligaments tend to get smaller and spread radially. The spray structure studies are also conducted at high gas pressures in a specially designed high pressure chamber with optical access. The near nozzle spray structure at the end of the injection shows that the liquid jet breakup is improved with increase in gas density. The droplet size measurement is possible only late in the injection duration when the breakup appears to be complete and mostly spherical droplets are observed. Hence, droplet size measurements are performed after 1.3 ms from start of the injection pulse. Spatial and temporal variation in Sauter Mean `Diameter (SMD) is observed and reported for the case corresponding to an injection pressure of 700 bar. Overall, this study has highlighted the importance of verifying the extentof atomization and droplet shape even in dense sprays before using conventional dropsizing methods such as PDPA.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the MULTI-SCIENCE PUBL CO LTD, 5 WATES WAY, BRENTWOOD CM15 9TB, ESSEX, ENGLAND
Keywords: Transient diesel spray; Internal structure; Effect of gas density; PDIA
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 19 Aug 2014 09:04
Last Modified: 19 Aug 2014 09:04
URI: http://eprints.iisc.ac.in/id/eprint/49559

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