Published 4 issues per year
ISSN Print: 1065-3090
ISSN Online: 1940-4336
Indexed in
VISUALIZATION OF INTERACTING PILOT AND MAIN DIESEL-TYPE SPRAYS IN AN ENGINE
ABSTRACT
An optically accessible research engine, image acquisition, and a control system are designed to acquire two-dimensional images of a pilot and main diesel fuel sprays. The ultimate objective is to study the nature of interactions between two fuel sprays and to develop a knowledge base on this interaction to augment the on-going research on possible nitric oxide emission reduction by pilot injection. This report presents the engine-based apparatus, image acquisition techniques, and preliminary results of analysis performed upon interacting diesel fuel sprays. The engine is a single-cylinder, compression-ignition two-stroke with optically accessible head mounted on a high-speed cooperative fuel research (CFR) engine crankcase. It is equipped with a special dual-injection system for production of in-cylinder interacting sprays (main and pilot) with a high degree of adjustability with regard to the sprays' fuel quantities and injection timings. The engine construction permits illumination of the sprays by a thin sheet of laser light from a pulsed Nd:YAG laser frequency doubled to operate at the visible wavelength of 532 nm. Light scattered from the droplets passes through a top-mounted viewing window on a diode array camera, yielding a digital image that defines the boundary of the spray plumes. This permitted spatially resolved images of the interacting sprays. Personal computer-based programs control injector activation times, synchronize operation of the laser illumination system, and acquire/process and display of the spray plume images. Two-dimensional images are presented and discussed for a selected condition.
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Chehroudi B., Sinko K. M., Shih S., A Novel Approach for Simultaneous NOx and Smoke Reduction: Interacting-Sprays Injection, SAE Technical Paper Series, 1, 1996. Crossref
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Greenberg J. B., Interacting Sprays, in Handbook of Atomization and Sprays, 2011. Crossref
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Campbell P. H., Sinko K. M., Chehroudi B., Liquid and Vapor Phase Distributions in a Piloted Diesel Fuel Spray, SAE Technical Paper Series, 1, 1995. Crossref