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Microscopic Characterization of Diesel Sprays at VCO Nozzle Exit
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English
Abstract
A long-distance microscope with pulse-laser as optical shutter up to 25kHz was used to magnify the diesel spray at the nozzle hole vicinity onto 35-mm photographic film through a still or a high-speed drum camera. The injectors examined are high-pressure valve-covered-orifice (VCO) nozzles, from unit injector and common rail injection systems. For comparison, a mini-sac injector from a hydraulic unit injector is also investigated. A phase-Doppler particle analyzer (PDPA) system with an external digital clock was also used to measure the droplet size, velocity and time of arrival relative to the start of the injection event. The visualization results provide very interesting and dynamic information on spray structure, showing spray angle variations, primary breakup processes, and spray asymmetry not observed using conventional macroscopic visualization techniques. The near-field spray behavior is shown to strongly depend on the nozzle geometry, needle lift dynamics, and injection pressure, which is a function of the injection system.
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Authors
- Ming-Chia Lai - Mechanical Engineering Department, Wayne State University
- T.-C. Thomas Wang - Mechanical Engineering Department, Wayne State University
- Xingbin Xie - Mechanical Engineering Department, Wayne State University
- Jong-Sub Han - Mechanical Engineering Department, Wayne State University
- Naeim Henein - Mechanical Engineering Department, Wayne State University
- Ernest Schwarz - U.S. Army TARDEC
- Walter Bryzik - U.S. Army TARDEC
Topic
Citation
Lai, M., Wang, T., Xie, X., Han, J. et al., "Microscopic Characterization of Diesel Sprays at VCO Nozzle Exit," SAE Technical Paper 982542, 1998, https://doi.org/10.4271/982542.Also In
References
- Arcoumanis, C. Gavaises, M. Nouri, J. M. Abdul-Wahab, E. Horrocks, R. W. 1998 “Analysisi of the Flow in the Nozzle of a Vertical Multi-Hole Nozzle Diesel Engine Injector,” SAE 980811
- Dan. T. Lai, M.-C. 1998 “Modeling Primary Turbulent Breakup Processes in Diesel Sprays,” ILASS AMERICAS '98
- Dec, J. E. 1997 “A Conceptual Model of Diesel Combustion Based on Laser-Sheet Imaging,” SAE 970873
- Fath A. Münch K. U. Leipertz A. 1997 “Spray Break-up Process of Diesel Fuel Investigated Close to the Nozzle” ICLASS -'97 513
- Giorgio, F. Laforgia, D. Damiani, V. 1995 “Investigation of Drop Size Distribution in the Spray of a Five-Hole, VCO Nozzle at High Feeding Pressure,” SAE 950087
- Harrington, D. Lai, M.-C. 1998 “Characterization and Visualization of Hole-To-Hole Variation and Wall Impingement of Diesel Sprays,” ILASS AMERICAS '98 106 110 Sacramento May 17-20 1998
- Koo, J.-Y. Martin, J. K. 1991 “Comparisons of Measured Drop Sizes and Velocities in a Transient Fuel Sprays with Stability Criteria and Computed PDF's SAE 910179
- Lai, M.-C. Henein, N. A. Xie, X. Chue, T.-H. Itoh, Y. Bryzik, W. 1995 “Diesel Cold-Starting Study using Optically Accessible Engines,” SAE paper 952366
- Sjoberg, H. Manneberg, G. Cronhjort, A. 1996 “Long-Working-Distance Microscope used for Diesel Injection Spray Imaging,” Optical Engineering 35 12 3591 3596
- Smith, D. P. 1997 “Cavitation in Diesel Fuel Injector Nozzles,” University of Wisconsin, Madison, Mechanical Engineering Department