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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v2.i1.80
pages 93-112

VISUALIZATION OF INTERACTING PILOT AND MAIN DIESEL-TYPE SPRAYS IN AN ENGINE

K. M. Sinko
GM Electro-Motive Division, LaGrange, Illinois, USA
D. Pushka
UIC Engine Laboratory, Department of Mechanical Engineering, University of Illinois, Chicago, Illinois 60680
B. Chehroudi
Department of Mechanical Engineering, University of Illinois at Chicago, Chicago, Illinois, USA

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.