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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2015011356
pages 93-119

VISUALIZATION OF CAVITATING FLOW WITHIN A HIGH-ASPECT-RATIO SLOT INJECTOR

Andrew S. Thompson
Maurice J. Zucrow Laboratories, Department of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana 47906, USA
Stephen D. Heister
Maurice J. Zucrow Laboratories, Department of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana, USA

SINOPSIS

Cavitation inside the passages of an injector can result in decreased discharge characteristics. This paper describes a flow visualization study to characterize cavitation structures in the flow of methanol through a series of high aspect ratio slot orifice injectors of varying L/DH. Cavitation structures were observed to evolve through a series of regimes corresponding to increased pressure drop across the injector. Specifically, the cavitation region lengthens as pressure drop increases. The lengthening cavitation results in a decrease in discharge coefficient that follows a predictable pattern. As the cavitaton lengthens to occupy the length of the injector and hydraulic flip occurs, the discharge coefficient drops suddenly away from what is predicted. In the cavitating injector other flow structures are observed and described. Also, high speed videos are analyzed for frequency content through the cavitation region. Frequency content appears to be concentrated below 1 kHz, with the majority of content existing below 200 Hz.


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