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Dynamic Ballistic Imaging: A technique to measure acceleration in the spray formation region

Mattias Rahm (Institutionen för tillämpad mekanik, Förbränning) ; Zachary Falgout (Institutionen för tillämpad mekanik, Förbränning) ; David Sedarsky (Institutionen för tillämpad mekanik, Förbränning) ; Mark Linne (Institutionen för tillämpad mekanik, Förbränning)
ILASS Americas, May 17-20 2015, Raleigh NC, USA (2015)
[Konferensbidrag, refereegranskat]

There is a need to acquire quantitative data from the spray formation (primary breakup) region of atomizing sprays. Such data would increase understanding of the dynamics governing breakup and provide a means to validate computational codes. To probe this region, however, is very challenging. One reason is the droplet cloud that surrounds it. This cloud effectively scatters light at optical wavelengths and can thus prevent larger fluid structures in the interior from being probed. Ballistic imaging is a technique, often used in a trans-illumination scheme, designed to mitigate the effects of scattering from the droplet cloud with the use of specialized optical filtering techniques. The resulting ballistic images are composed of the fraction of the incident light that retains image information from inside the spray. Consequently, it can reveal larger fluid structures and interfaces from the interior of this region and thus provide information on primary breakup. In this paper we discuss the implementation of a ballistic imaging system capable of acquiring three ballistic images in rapid succession with a well-defined time separation. Using image correlation velocimetry techniques on the image triplet, two dimensional velocity and acceleration fields of the primary breakup region can be obtained.

Nyckelord: Combustion engines, Diesel, Spray formation, Ballistic Imaging, Spray Dynamics,



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Denna post skapades 2015-05-25. Senast ändrad 2015-07-28.
CPL Pubid: 217480

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Förbränning (2007-2017)

Ämnesområden

Transport
Fysik
Maskinteknik

Chalmers infrastruktur