2023 Volume 51 Issue 2 Pages 90-98
Unstable flow and pressure fluctuations due to diffuser rotating stall（DRS）are one of the important industrial issues because limit the operating range of pumps. In this study, the effect of DRS suppression by different diffuser vane slit widths was analyzed by experiment and CFD. As a result of the experiment, it was found that the DRS can be suppressed in all flow rate range with diffuser vane slits over a certain width. The result of relationship between the DRS suppression effect and the flow near the slit flow was analyzed by CFD, it was found that the momentum of the slit flow was an important indicator of the DRS suppression effect.
