| 摘要 |
<p>A member having an internal channel communicating coolant is delimited by sidewalls comprising a first sidewall 16 or 17 having ribs 47 extending transversely to the longitudinal direction of the channel and a second wall 4a or 6a adjacent the first sidewall 16 or 17 and has roughness elements (figs 5 and 6) distributed over it which are lower in height than the ribs 47. The longitudinal and transverse dimensions of the roughness element maybe equal to the height of the roughness elements. The roughness elements maybe spaced apart in both directions at least twice the dimensions of the longitudinal and transverse dimensions, may have a shape of a cylinder, cone, pyramid or rectangular parallelepiped, and maybe arranged in regular, irregular or random two dimensional arrays. The ribs 47 maybe skewed at angles between 30 and 60 degrees with respect to the longitudinal direction, maybe arcuate or sinuous, maybe equally spaced along the channel, or maybe staggered on one wall relative to the opposite wall. The member maybe a gas turbine blade and sidewalls 16 or 17 maybe webs extending between the second walls 4a and 6a which correspond to the convex suction side and concave pressure side of the blade (fig 2).</p> |
