Abstract
Experiments on swirling flows through conical diffusers have been carried out. Mean and fluctuating velocities, and static pressure in three diffusers of different included angle were measured under the various swirl intensity. In addition, relationships between static pressure recovery and flow characteristics were investigated. In the case of weak swirl that the static pressure recovery is improved, it is shown that the separation of the flow from the wall is prevented and the velocity is made rapidly uniform, and additionally that the turbulence is suppressed. In the meantime, the vibration of the pipe is observed in the flow with strong swirl and it is clarified that this vibration is induced by eccentricity of the center of the swirling flow, its center circulating about the pipe axis, from the results of the velocity measurement.
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