Сельскохозяйственные машины и технологии (Aug 2015)
DISTRIBUTION OF AN AIR STREAM SPEED IN THE DEEP ASPIRATING CHANNEL
Abstract
There are air separators in agriculture, which clean seed materials only by means of an air stream. Thanks to constructive simplicity and compactness the machines having the rectangular cross-section channel with vertical air stream feed are especially popular. Efficiency of cleaning of the processed material in such channel is depending on its depth. For this reason depth in all channels in the air separators and air separating systems of seed cleaning machines does not exceed 300 mm. It was revealed that depth of the channel can be increased due to applying special constructive decisions, for example plates barriers. Distribution of air stream speed influences quality of operation of the air separating machines. The field of air stream speeds in the channel was estimated by distribution factor determined by a probability theory method. The authors were investigated influence of plates-barriers on distribution of air stream speed in the air separating channel and on efficiency of cleaning of the processed material. It was established that at grain loading of 2 kg per sq. m per hour in the channel with plates-barriers of 700 mm in depth distribution factor of air stream speed was 3.7 times lower, than in traditional one without barriers (4.4 percent against 16.2), and air separator productivity thus increased by 15-50 percent. This channel can be used at cleaning of lightweight seeds, thin, small seeds of the main culture from hardly separable weed seeds with getting the processed material to categories of original and elite seeds (in accordance with All Union State standard R 52325-2005)
