抄録
In this study, the effects of the variation in the logarithmic spiral angle of the curved diffuser on the flow pattern are clarified by the flow visualization, and their results are compared with the numerical solutions obtaind by the finite element method. And the difference of flow patterns between the open channel and the closed channel is clarified.
As the results, it was found that the flow patterns using closed channel by the flow visualization agreed comparatively with numerical results, and the performance of the curved diffuser was affected considerably by the logarithmic spiral angle, especially, the flow pattern indicated the desirable value, when the spiral angle β was in the region of about from 20° to 25°.
