... are induced by the rotating stall with three cells that occur in the diffuser flow channel, and the corresponding high amplitude frequencies are St 0.0074 and St 0.0111 , respectively. The effect of the stall cells is particularly severe near the hub. When the flow rate is further reduced to 0.68Q DES...

... outlet, which caused difficulties in the design of the diffuser and scroll. In the experimental test, the high total pressure loss in the parallel diffuser and scroll parts was observed. This was found to be the result of the significant friction loss caused by the long flow path due to strong...

... Unsteady Flow Conditions ,” Fourth Conference of ISME , pp. 233 – 244 . Ribi , B. , and Dalbert , P. , 2000 , “ One-Dimensional Performance Prediction of Subsonic Vaned Diffusers ,” ASME J. Turbomach. 0889-504X , 122 , pp. 494 – 504 . 10.1115/1.1303816 Damian , K. , 2007...

... that assure a good cleaning of these circuits without disassembling them. Generally, different arrangements are present in these hydraulic circuits, such as expansions, diffusers, and elbows. The flow crossing these singularities strongly affects the process of cleaning in place. This work...

...Junichi Kurokawa; Hiroshi Imamura; Young-Do Choi The purpose of this study is to examine the validity of J-grooves in controlling and suppressing the swirl flow in a conical diffuser, for draft surge suppression in a Francis turbine, which is caused by the swirl flow from the runner outlet...

...B. Daniel Marjavaara; T. Staffan Lundström; Tushar Goel; Yolanda Mack; Wei Shyy A multiple surrogate-based optimization strategy in conjunction with an evolutionary algorithm has been employed to optimize the shape of a simplified hydraulic turbine diffuser utilizing three-dimensional Reynolds...