“Investigation of Rotating Instability in the Last Stage of Low Pressure Turbine during Low volume flow Operation” (original) (raw)

The rotating instability flow phenomenon is numerically studied earlier in the laststage of low pressure model steam turbine operated at very low mass flow rate. This kind of instability imposes a major risk to the mechanical integrity of last stage moving blades (LSMBs) in low-pressure (LP) steam turbines.Aim is to predict correctly the unsteady flow phenomena and their effects. A Numerical analysis using a validated unsteady non-linear time-domain CFD solver is performed. A computational study on two different selfdesigned 3D blade sections is subsequently carried out. These results show that a rotating instability in a turbine blade configuration can be captured by 3D model also.In comparison to the many previous investigations, the results suggest that the beginning and the development of rotating instabilities can also occur without 3D and tip leakage flows, although the very accuracy is possible only when comparing the experimental results with 3D solutions.

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