الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The laboratory model was manufactured to simulate and study the aerodynamic characteristics of air and reduce the pollution coming from harvesting machine and test the performance of the developed cleaning unit at four aerodynamic suction velocities 5.9, 8.5, 11.6 and 14.9 m.s-1, three feed rates 3, 5, and 7 kg.min-1, two rotational speed 245 and 350 rpm to operate the screens, two shapes for suction part rectangular and circle and three slope angles for screens 5, 10 and 15° with three replicates.
The results indicated that the average of minimum specific energy was 8.46 kW.h.ton-1 for 5.9 m.s-1 aerodynamic suction velocity, 5º screen slope, 0.42 ton.h-1 feed rate, 245 rpm rotational speed and circle shape of suction tube. Also, the maximum cleanliness was 99.41% for aerodynamic suction velocity of 14.9 m.s-1, slope of the screen was 15º, at feed rate of 3kg.min-1, rotational speed of 245 rpm and rectangular shape of suction tube.