CHARACTERISTICS OF A SPIRAL PLACED IN A TUBE WITH A LARGE RADIAL GAP

摘要

A spiral device is considered as the input to a centrifugal pump: an axial vortex pump (AVP), with the spiral placed in a tube with a large radial gap. Test results are presented in relative coordinates: the input coefficient φ and the pressure coefficient ψ. Experimental characteristics have been obtained for a spiral in a tube with a minimal gap and for a calculation on a formula for an AVP. There is good agreement over the results for the head for φ = 0.