Turbine blade

Details Turbine blade Turbine blade

1985-04-09

1986-12-02

Casaregola, Louis J.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

F01D 514

Patent

active

046261745

ABSTRACT:
A turbine blade of a low blade profile loss with a crossing point of an inlet angle .alpha..sub.1 an outlet angle .alpha..sub.2 being located in a position in which a distance between a crossing point of the outlet end of the blade is greater than one-half of the blade width L.sub.ax, with the inlet angle .alpha..sub.1 being in the range of 35.degree.-40.degree. and the outlet angle .alpha..sub.2 being in the range of 25.degree.-28.degree.. A ratio of a narrowest width S.sub.2 of the flow channel at the blade outlet end to a narrowest width S.sub.1 of a flow channel defined between a backside of the blade in an area of the crossing point and a front side of adjacent blade lies in the range of 0.81-0.96. A ratio of a distance L.sub.ax to a blade width L.sub.ax is in the range of 0.5-0.54, with a ratio of a distance L.sub.m from an outlet end of the blade to the blade width L.sub.ax being in a range of 0.75-0.89. A ratio of a distance from the maximum projecting point to a line connecting to the outlet end of adjacent blades is in a range of 0.6-0.66. By virtue of the blade profile, the flow velocity differential between the fluid flowing along the front side of the blade and the fluid flowing along the backside of the blade can thereby be reduced.

REFERENCES:
patent: 1749528 (1930-03-01), Freudenreich et al.
patent: 3475108 (1969-10-01), Zickuhr
patent: 3953148 (1976-04-01), Seippel et al.
Kuethe, A. M., et al., "Foundations of Aerodynamics", John Wiley, N.Y., 1967; pp. 75-89.

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