Accession Number : AD1011045


Title :   Ballistic Imaging and Scattering Measurements for Diesel Spray Combustion: Optical Development and Phenomenological Studies


Descriptive Note : Technical Report,01 May 2012,31 Dec 2015


Corporate Author : Colorado School of Mines Golden United States


Personal Author(s) : Parker,Terence E ; Porter,Jason M ; Duran,Sean P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1011045.pdf


Report Date : 01 Apr 2016


Pagination or Media Count : 47


Abstract : Ballistic imaging using a 15 picosecond pulse laser in high-injection-pressure diesel sprays is reported. An optical Kerr effect shutter, constructed from a CS2 liquid cell and activated by a 15 picosecond pulse at 1064 nm, produces effective 532 nm imaging pulses between 7and 15 picoseconds. The performance of the imaging system is characterized using an Air Force target positioned before an optical cell filled with polystyrene spheres in a water suspension. The impact of spatial filtering, temporal filtering, and scattering path length on image resolution are reported. The technique is demonstrated by imaging the near-orifice region of methyl oleate and methyl butyrate sprays injected using a high-pressure single-hole fuel injector with direct comparison against simultaneous orthogonal shadowgraphy.


Descriptors :   measurement , scattering , imaging techniques , combustion , fuel sprays , diesel engines , simulators


Distribution Statement : APPROVED FOR PUBLIC RELEASE