Experiments on the Conical Diffuser Performance with Asymmetric Uniform Shear Inlet Flow : Effect of Tailpipe Discharge

抄録

Experimental results of the pressure recovery and velocity profiles in conical diffusers having a tailpipe with various inlet main flows which have an asymmetric uniform shear are presehted. Experiments were performed on four types of diffuser angle and four degrees of shear of inlet flow for each diffuser. Main results obtained are ; 1. Although the diffuser performance of the present case decreases with an increasing shear of inlet main flow as in the case of free discharge, the rate of performance reduction with shear is strongly decreased as compared with the case of free discharge. The effect of the tailpipe on the diffuser performance becomes stronger with an increasing shear of inlet main flow. 2. In the tailpipe, the velocity profile of each diffuser is uniformalized within the distance of 6 to 9 times the tailpipe diameter from the tailpipe inlet, in spite of the large asymmetry and non-uniformity of the tailpipe inlet flow.