CD-adapco is the world's largest independent CFD-focused provider of engineering simulation software, support and services. We have over 30 years of experience in delivering industrial strength engineering simulation.
The conjugate heat transfer methodology has been
employed to predict the flow and thermal properties
including the metal temperature of a NASA turbine vane at
three operating conditions. The turbine vane was cooled
internally by air flowing through 10 round pipes. The
conjugate heat transfer methodology allows a simultaneous
solution of aerodynamics and heat transfer in the external
hot gas and the internal cooling passages and conduction
within the solid metal, eliminating the need for multiple /
decoupled solutions in a typical industry design process.
The model of about three million computational meshes
includes the gas path and the internal cooling channels,
comprising hexa cells, and the solid metal comprising hexa
and prism cells. The predicted aerodynamic loadings were
found to be in close agreement with the data for all the
cases. The predicted metal temperature, external and
internal heat transfer distributions at the mid-span
compared well with the measurement. The differences in
the heat transfer rates and metal temperature under
different running conditions were also captured well. The
V2F turbulence model has been compared with a low-
Reynolds-number k-e model and a non-linear quadratic k-e
model. The V2F model is found to provide the closest
agreement with the data, though it still has room for
improvement in predicting the boundary layer transition
and turbulent heat transfer, especially on the suction side.
The overall results are quite encouraging and indicate that
conjugate heat transfer simulation with proper turbulence
closure has the potential to become a viable tool in turbine
heat transfer analysis and cooling design.