For the interaction between diverse internal cooling structures in turbine blades

various shaped ribs’ influences on pin-fin array heat transfer and pressure drop were investigated using a transient liquid crystals test. The 90°

60°

V-shaped and W-shaped ribs were considered to compare the characteristic differences of pin-fin array heat transfer distribution

heat transfer enhancement and pressure drop levels. The results showed that upstream ribs made the spanwise variation of pin-fin endwalls heat transfer non-uniform. The vortices induced by upstream ribs appeared to enhance pin-fin array heat transfer but reduce pressure drop

leading to an overall thermal efficiency improvement. The W-shaped and 90° ribs made pin-fin arrays yield the best thermal efficiency and then the V-shaped and 60° ribs.