An Experimental Study of Swirling Flow in Pipes

概要

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Swirling flows in cylindrical ducts were investigated by many researchers to meet practical requirements, but the detailed nature of the flows has not yet been clarified. This paper describes the experimental results of swirling flow obtained in stationary cylindrical pipes. Except the inlet region of the pipes, velocity distributions of the swirling flow are governed by a single dimensionless parameter Ω defined by (angular momentum flux)/(axial momentum flux), irrespective of the inlet conditions of flows and wall roughness. This swirling flow shows three kinds of flow patterns in its course of decay; (1) forced-free vortex type, (2) transitional type, (3) forced vortex type. The strength of the swirl Ω decreases exponentially along the pipe axis and its decrement varies with change of the flow patterns. Shear stresses for these flow were calculated, and also the total amount of flow energy was discussed in connection with wall pressure measured along the pipe axis.
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