Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...
Patent
1998-07-08
2000-05-30
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
With heating, cooling or thermal insulation means
Changing state mass within or fluid flow through working...
416 96A, 416 97A, F01D 518
Patent
active
060684453
ABSTRACT:
In a cooling system for the leading-edge region of a hollow gas-turbine blade, a duct (3), through which flow occurs longitudinally, extends from the blade root up to the blade tip and is defined in the region of the blade body (4) by the inner walls of the leading edge (5), the suction side (6) and the pressure side (7) and by a web (8). The inner walls of the suction side and the pressure side are provided with a plurality of ribs (9), which run slantwise and at least approximately in parallel. The suction-side ribs and the pressure-side ribs are offset from one another over the blade height. The ribs (9) run radially inward from the web (8) in the direction of the leading edge (5), merge into the radial in the region of the leading edge and are led around the leading edge. The deviation of the ribs (9) from the slant into the radial is effected with the smallest possible radius. The ratio of the height (h) of the ribs (9) to the local height (H) of the duct (3) is constant over the longitudinal extent of the ribs.
REFERENCES:
"Augmented Heat Transfer in Triangular Ducts with Full and Partial Ribbed Walls", Zhang, et al., Journal of Thermophysics and Heat Transfer, vol. 8, No. 3, Jul.-Sep. 1994, pp. 574-579.
Beeck Alexander
Johnson Bruce
Weigand Bernhard
Wu Pey-Shey
ABB Research Ltd.
Barton Rhonda
Look Edward K.
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