Study on the Unbalanced Curl Seal Failure of the Magnetorheological Fluid Sealing Device of the Hydraulic Turbine Main Shaft under Different Speed Abrupt Conditions

The fluid flow in the runner of a hydraulic turbine has serious uncertainties. sealing failure magnetorheological (MR) device main shaft hydroturbine, caused by sudden change speed, always been difficult topic to research. This study first derives MR seal pressure and unbalanced curl equations hydroturbine shaft, then analyzes friction heat under different rotational speed mutation conditions through experiments. After verification, temperature field magnetic distribution are obtained via numerical calculation. results show that external affects moment particles fluid, resulting significant frictional heat, thereby reducing saturation induction intensity fluid. decrease ability device. size abrupt amplitude turbine, is positively correlated causing failure. Based on our results, we recommend adding necessary cooling reduce increasing life