tailieunhanh - Effect of strainer type, spray pressure, and orifice size on the discharge coefficient of standard flat-fan nozzles

The aim of this study was to determine the effect of nozzle strainer type (cylindrical, ball check, slotted, and cup screen type), spray pressure, and nozzle orifice size on the discharge coefficient (Cd) of standard flat-fan nozzles of different nominal sizes (from 02 to 06) and 110° spray angle. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2015) 39: 692-704 © TÜBİTAK doi: Research Article Effect of strainer type, spray pressure, and orifice size on the discharge coefficient of standard flat-fan nozzles Bahadır SAYINCI* Department of Agricultural Machinery and Technologies Engineering, Faculty of Agriculture, Atatürk University, Erzurum, Turkey Received: Accepted/Published Online: Printed: Abstract: The aim of this study was to determine the effect of nozzle strainer type (cylindrical, ball check, slotted, and cup screen type), spray pressure, and nozzle orifice size on the discharge coefficient (Cd) of standard flat-fan nozzles of different nominal sizes (from 02 to 06) and 110° spray angle. The flow rates measured for each nozzle orifice size and strainer type combinations were determined at five different spray pressures (, , , , and bars). In the study, size, shape, and area measurements concerned with nozzle geometry were performed and the differences between nozzles of different nominal sizes were revealed. Some of these data were also used to determine the liquid inlet and outlet velocity, discharge coefficient, and minimum spray pressure required for the atomization of nozzles with different strainer types. The liquid inlet and outlet velocity ranged from to m s–1 and to m s–1, respectively, depending on the spray pressures. The nozzles used with the cup screen and slotted strainers had identical velocity data as the same nozzles without strainers. The cylindrical and ball check strainers had a limiting effect on liquid inlet and outlet velocity, especially for 04 and 06 sizes. The Cd means of the nozzles with cup screen and slotted strainers, and of those without strainers, ranged from to , and the differences between their means were found to be statistically insignificant for .