Disk temperature details of rim seal turbulent heat diffusion and disk frictional heating

Heating from rim seal ingress and disk friction were numerically investigat ed using the simplified subproblem approach that excludes the mainstream co mplexities caused by the presence of vanes and blades, as well as other asy mmetries. The combined effects of Re-0 and C-w on the blade-root/disk tempe ratures were analyzed. The elliptic, two-dimensional axisymmetric Navier-St okes equations were solved at typical engine temperatures, pressures, and n ow rates using adiabatic surfaces. For an axisymmetric, axial clearance rim seal without mass ingress, it was found that the intense tau(rx) from the mainstream produces extremely high-turbulence kinetic energy, This extremel y high-turbulence energy at the mainstream-rim seal interface gives high-tu rbulence heat diffusion ingress without mass ingress. It was also found tha t turbulent heat diffusion ingress is dominant over disk frictional heating for Re-0 values near half of the engine nominal value. Further, it was fou nd that it is the high values of Re-0 that gives high gap recirculation zon e temperatures, but sufficient disk centrifugal pumping to reduce the area for heat convection between the gap recirculation zone and the blade-root s urface.