Liquid sheet break-up in coflowing shear flow is the mean by which liquids are atomized in practical injectors for gas turbine combustors. The present study explores experimentally the mechanisms of liquid sheet instabilities and spray formation. Experiments are conducted on four airblast geometries. A high-speed video camera associated with an image processing unit was used to study the liquid sheet instabilities. A microphone and a frequency analyzer were used to track the disintegration frequency. Instability amplitude and disintegration length of the liquid sheet were measured. A two-component Phase Doppler Particle Analyzer was used to characterize the resultant spray. The spatial distribution of the particle size is influenced by the swirling flow field. These experimental results will be used to assess models of fuel sheet instabilities and disintegration.
This paper presents detailed experimental results of a vaporizing spray produced by two atomizers in a coflowing air stream inside a constant section lean premixer prevaporizer tube. This study is part of an ongoing effort to understand the behavior of spray under a variety of conditions. PDPA was used to characterize the atomization and vaporization process. The evolution of the two phase flow at each section was assessed in terms of global spray behavior and spray dynamics. The results confirm the influence of fuel injector on size distribution also the relative velocity between gas and dispersed phase on secondary atomization, and finally the complex spray structure in terms of wall proximity.
Liquid sheet break-up in co flowing shear flow is the mean by which liquids are atomized in practical injectors for gas turbine combustors. The present study explores experimentally the mechanisms of liquid sheet instabilities and spray formation. Experiments are conducted on four airblast geometries.
A high speed video camera associated to an image processing unit was used to study the liquid sheet instabilities. A microphone and a frequency analyzer were used to track the disintegration frequency. Instability amplitude and disintegration lenght of the liquid sheet were measured.
A two component Phase Doppler Particle Analyzer was used to characterize the resultant spray. The spatial distribution of the particle size is influenced by the swirling flow field.
These experimental results will be used to assess models of fuel sheet instabilities and disintegration.
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