3-D Navier-Stokes equations were solved with the conventional k-ε turbulence model to predict turbulent flow and heat transfer in the internal cooling passage of the gas turbine blades

in which the staggered arrays of discrete helix-alike rectangular-fins or wedged-fins with a certain angle were used along two inside opposite walls.Results were presented for Reynolds number in the range of 1×104 to 2×105

cross-section aspect ratio of 2.9

fin height to hydraulic diameter ratio of 0.336

fin height to passage height ratio of 0.5

and the inclined angle of the helixalike fin of 15°.A complicated 3-D accelerated spiral-flow which just likes the fluid flow in helical-fin tube has been formed and it has significant effects on the heat transfer.The averaged Nusselt number ratios decrease and the friction factor ratios increase with the increasing Reynolds number for all the studied cases.Also the detailed discussion of the influence of helix-alike fin surface shape on heat transfer and pressure drop was given.It is found that

the heat transfer enhancement in the internal cooling passage with helix-alike rectangular-fin is better than others

but the comprehensive enhancement performance ratio is lower than that with helix-alike wedged fins.