Abstract
Reverse flow which occurs in a low pressure steam turbine rotor under the low load operation was analyzed by the three-dimensional turbulent flow computation. The computed flow angles at the inlet and exit of the rotor agreed well with the experimental results in the scale-model turbine and also with the results based on the quasi 3-D inviscid flow analysis. It is clearly shown that the spiral-type vortex appears due to the reverse flow at the rotor root, and in addition, the leading-edge separation occurs on the pressure surface over the rotor blade height, especially a large separation occurs at the root side due to a high incidence angle. The present study suggests that the unstable flow might be caused by the spiral-type vortex and the leading-edge separation under lower load operations.
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