caa a22 4500 606198229 CHVBK 20210128100933.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00348-015-1953-3 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1953-3 Picosecond ballistic imaging of diesel injection in high-temperature and high-pressure air [Elektronische Daten] [Sean Duran, Jason Porter, Terence Parker] The first successful demonstration of picosecond ballistic imaging using a 15-ps-pulse-duration laser in diesel sprays at temperature and pressure is reported. This technique uses an optical Kerr effect shutter constructed from a CS2 liquid cell and a 15-ps pulse at 532nm. The optical shutter can be adjusted to produce effective imaging pulses between 7 and 16ps. This technique is used to image the near-orifice region (first 3mm) of diesel sprays from a high-pressure single-hole fuel injector. Ballistic imaging of dodecane and methyl oleate sprays injected into ambient air and diesel injection at preignition engine-like conditions are reported. Dodecane was injected into air heated to 600°C and pressurized to 20atm. The resulting images of the near-orifice region at these conditions reveal dramatic shedding of the liquid near the nozzle, an effect that has been predicted, but to our knowledge never before imaged. These shedding structures have an approximate spatial frequency of 10mm−1 with lengths from 50 to 200μm. Several parameters are explored including injection pressure, liquid fuel temperature, air temperature and pressure, and fuel type. Resulting trends are summarized with accompanying images. Springer-Verlag Berlin Heidelberg, 2015 Duran Sean Mechanical Engineering Department, Colorado School of Mines, 80401, Golden, CO, USA aut Porter Jason Mechanical Engineering Department, Colorado School of Mines, 80401, Golden, CO, USA aut Parker Terence Mechanical Engineering Department, Colorado School of Mines, 80401, Golden, CO, USA aut Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-12 0723-4864 56:4<1 2015 56 348 https://doi.org/10.1007/s00348-015-1953-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1953-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Duran Sean Mechanical Engineering Department, Colorado School of Mines, 80401, Golden, CO, USA aut NATIONALLICENCE 700 1- Porter Jason Mechanical Engineering Department, Colorado School of Mines, 80401, Golden, CO, USA aut NATIONALLICENCE 700 1- Parker Terence Mechanical Engineering Department, Colorado School of Mines, 80401, Golden, CO, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-12 0723-4864 56:4<1 2015 56 348