4. Conclusions
In this study, the effects of perforated blockage and side wall
configurations of a turbine blade trailing edge model on the heat
transfer augmentation and pressure loss were experimentally
investigated. A total of eight blockage types and three side wall
types were considered. Based on the experimental results, the following
conclusions have been derived.
(1) For all cases, the Nusselt number ratio and the thermal performance
factor decreased as the Reynolds number
increased. The friction factor ratio increased with the Reynolds
number.
(2) As the number of circular holes on the blockage increased,
the distribution of the Nusselt number became more uniform.
However, the overall averaged Nusselt number ratio
and the thermal performance factor decreased.
(3) The cases with jet holes close to the side walls showed high
Nusselt number ratios. Generally, the cases with high Nusselt
number ratios showed high pressure losses.
(4) Dimpled side wall cases resulted in increased Nusselt numbers,
but the pressure losses also increased slightly. The
thermal performance factors for the dimpled side wall cases
were higher than that for the smooth side wall case by up to
25%.