Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...
Patent
1985-12-23
1987-06-30
Howell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With heating, cooling or thermal insulation means
Changing state mass within or fluid flow through working...
415115, F01D 518
Patent
active
046767193
ABSTRACT:
The external wall of a hollow airfoil for a gas turbine engine has a plurality of longitudinally aligned diffusing coolant passages having their outlets at the outer surface over which a hot gas is intended to flow. The airfoil external wall also includes a longitudinally extending slot formed in the inner surface thereof. Each of the coolant passages intersect such longitudinally extending slot to define metering inlets to each passage for receiving coolant fluid from the slot at a controlled rate. The coolant diffuses as it passes through each passage and exits as a thin film on the external surface of the airfoil. The slot is cast in the inner surface of the wall at the time of forming the airfoil; and the passages are machined into the wall from outside the airfoil. Very small, accurate metering areas for each passage can thereby be formed in single-piece hollow airfoils without access to the interior of the airfoil.
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Flight and Aircraft Engineer, No. 2460, vol. 69, 3-16-56, pp. 292-295.
Advances in Heat Transfer by Richard J. Goldstein, vol. 7, Academic Press (N.Y.) 1971 The Monograph Film Cooling, pp. 321-379.
NASA Technical Paper 1546 Influence of Coolant Tube Curvature on Film Cooling Effectiveness as Detected by Infrared Imagery by S. Stephen Papell et al, 1979.
Auxier Thomas A.
Field Robert E.
Howell, Jr. Everette A.
Revis Stephen E.
United Technologies Corporation
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