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Experimental Investigation into the Liquid Sheet Break-Up of High-Pressure DISI Swirl Atomizers
Technical Paper
2003-01-3102
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents the results of an experimental study into the liquid sheet break-up mechanisms of high-pressure swirl atomizers of the type commonly used in direct-injection spark-ignition (DISI) engines. Sheet disintegration was investigated at two fuel pressures: 5 and 10 MPa, and three ambient back pressures: 50, 100 (atmospheric) and 200 kPa for a pre-production DISI injector. Microscopic images of the near-nozzle spray region were obtained with a high-speed rotating drum camera and copper vapour laser. For the range of conditions considered, the results show the initial break-up to occur in ‘perforated-sheet’ mode. A novel ‘void fraction’ analysis technique was applied to multiple images from the steady-state period of a single injection event in order to characterise and quantify details of the sheet break-up process. The sheet break-up lengths obtained by the authors were compared with the break-up lengths predicted by three commonly employed models from the literature. In general, the break-up lengths measured experimentally were substantially greater than model predictions.
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Citation
Loustalan, P., Davy, M., and Williams, P., "Experimental Investigation into the Liquid Sheet Break-Up of High-Pressure DISI Swirl Atomizers," SAE Technical Paper 2003-01-3102, 2003, https://doi.org/10.4271/2003-01-3102.Also In
Gasoline Direct Injection Engine and Spark Ignition Performance
Number: SP-1807; Published: 2003-10-31
Number: SP-1807; Published: 2003-10-31
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