TS-80 3D Laser Anemometry in a Rotating Cooling Ribbed U-Channel(Session C-10 Turbine Cooling 2)

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Measured flow fields are presented for the flow within a rotating roughened channel which represents cooling passages of jet engine turbine rotor blades. The complex cooling circuits within the blades include rib-roughened walls. Combined to the effect of rotation, they generate a 3D turbulent flow which ensures high level of convective heat transfer. Last years, we demonstrated, with flow fields results obtained in a smooth rotating channel, that 3D laser anemometer is the most suitable tool and that its implementation on this application is possible. So, we were trustful in starting 3D laser anemometer measurements for the flow within the channel with cross ribs on two opposite walls. The results show a flow field quite different from the one in a smooth walls channel and fill the lack of experimental results about velocity fields. They complete thermal results obtained ; the two types of data are precious to validate Navier-Stokes calculations. Measurements were first made in static mode at Reynolds number of 5,000. The same model sections were then explored during rotation at a Reynolds number of 5,000 and a Rossby number of 0.33. The distorsion of the axial velocity profile resulting from the Coriolis acceleration appears clearly when comparing the results obtained in the sections of the centrifugal arm. The results obtained in the centripetal arm show that the flow depends on the 180° straight-corner turn located upstream. Finally, comparisons between experimental and calculated results show that our code simulates smaller secondary flows than those observed experimentaly.
公益社団法人日本ガスタービン学会の論文
1999-11-14

TS-80 3D Laser Anemometry in a Rotating Cooling Ribbed U-Channel(Session C-10 Turbine Cooling 2)

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