The effect of the ejector shape of air vacuum cleaner on performance

Abstract

In this study, we investigated the effect of the angle of air supply θ and the air inlet position x on the ejector performance of air vacuum cleaner. First, as the effect of the angle of air supply, it was found that in the case of θ=16deg, the ejector efficiency increases approximately 23% in comparison with θ=8deg which was a basic form. It is because that in the case of θ=16deg, high speed flow supplied from inlet expands uniformly in the narrow flow passage. Next, as the effect of the air inlet position, it was found that the ejector efficiency increases in the case of x=20mm regardless of the angle of air supply, and it raises approximately 56% at θ=8deg for x=3mm in particular. It is because that in the case of x=20mm, high speed flow which meets main passage at upstream side can be sent to the narrow flow passage independent of the angle of air supply.