Abstract
Uniform spiral flow in a central exhaust pipe and jet spiral flow which blows tangentially into one end opened cylinder from one direction, are fundamental ones in a cyclone dust collector, and so they have been measured by a cylindrical pitot tube, and discussed. The spiral angles of these flows are not affected by flow quantity, and the velocities are proportional to flow quantity. In the case of jet spiral flow, when the cylinder is extended to a certain limit, its pressures rise and its spiral angles decrease suddenly. The axial velocity distributions are not radially constant, but decrease inwards almost straightly as well as spiral angles.
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