Hollow-cone Spray of Viscous Liquid in High-pressure Gas Environment - Experimental Investigation for the Application of New Liquid Fuels to Gas-turbine -

Experimental investigations were performed on the hollow-cone spray of viscous liquids in high-pressure gas environment, aiming to obtain fundamental knowledge which was indispensable to survey the applicability of non-conventional new liquid fuels for the gas-turbine power-plant. Test liquid employed were water, diesel fuel, palm methyl ester (PME) and silicone-oil #10. The ambient gas was nitrogen of room temperature. The test nozzle was small-sized swirl atomizer; Delavan oil burner nozzle 60°A-0.85. The liquid flow-rate was ranging from 50 to 140cc/min, and the ambient-gas pressure was ranging from 0.1 to 1.0MPa. The behavior of injected liquid-sheet and ensuing spray-flow were observed in detail by flash photography. The apical-angle and the breakup-length of conical liquid-sheet and the cone-angle of spray were evaluated from the photographs. The Sauter mean diameter of spray was measured by the laser diffraction method, and the spray flow field was investigated by the PIV technique. The effects of liquid flow-rate, ambient-gas pressure and properties of test liquid upon the atomization characteristics were revealed. The spray contracted and showed bell-shape at high gas pressures. When viscous liquid was injected, the spray contraction was observed in wider range of flow-rate, and several peculiar atomization manners were also observed. The flow mechanisms were discussed in this study.