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Cyclic variability of pulsed spray vapor fields
Authors:J. H. Wright  J. A. Drallmeier
Affiliation:(1) Department of Mechanical and Aerospace Engineering and Engineering Mechanics 1870 Miner Circle University of Missouri-Rolla Rolla, MO-65409-0050, USA, US
Abstract: A two wavelength extinction technique is used to quantitatively measure the temporal fuel vapor field produced by pulsed automotive fuel injectors. Line-of-sight measurements are spatially deconvoluted to yield a picture of the overall, cycle-averaged, radial vapor concentration profiles. Vapor measurements are also given for single, consecutive, injection pulses, showing cycle-to-cycle variations in the vapor field. Methods to characterize the cyclic variability in the vapor field of a pulsed spray are discussed. As an illustrative example, the differences between an air assist and a non-air assist injector are shown as a function of duty cycle and axial location. Received: 11 August 1997/Accepted: 10 February 1998
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