مرکز منطقه ای اطلاع رساني علوم و فناوري - ساخت و ارزيابي سمپاشي با نازل ديسكي گريز از مركز

چكيده لاتين :

In this research nine discs in total with 10, 15 and 20cm in diameter each having 20, 40 and 80 grooves have been used to study the effects of relevant parameters. The discs have been made of CK45 steel sheet with grooves of 1 mm width on them. To rotate the disc a 1.47kw two-stroke gasoline engine has been utilized. The sprayerʹs reservoir has been filled with water and the flow rate set to 70 (cm3lmin) which entered to the central area of the discs. The spraying was carried out for each disc of three rotational speeds of 3000, 5000 and 7000 (rpm). The samples of droplets have been taken using a water sensitive card. All of tests were repeated with three replications. The samples were then analyzed using Win DIAS software to determine the dropletʹs size. The analysis of results showed that the influence of the three factors including disc diameter, number of grooves per disc and rotational speed on the dropletʹs size were significant at one percent level. The results showed a reversed relation between all factors, that is the dropletʹs size decreased with increasing the factors. However the rotational speed was the most important factor in dropletʹs size with 74.1 percent of the dropletʹs size variation. The disc diameter and the number of grooves per disc were in placed the second and third order, with 13.6 and 8.1 percent of the dropletʹs size variation respectively. According to the results of this study, it is suggested that for spraying against plant diseases and smaller pests a bigger disk with higher speed and higher number of grooves is prefered, which for spraying against large pests and applying weed control chemical (herbiside) to avoid drift a smaller disk with less number of grooves and lower speed might be desirable.