Blades

While the process engineer does not need to understand the aerodynamic theory that makes the axial compressor perform, a few basics may be helpful. Acquaintance with the blading nomenclature and the fundamental velocity triangle may also keep the terms used around these compressors from seeming like a foreign language. The airfoil in most axials is of the NACA type, generally a 65 series. A typical designation is 65-(18) 10. The 65 defines the profile shape. The 18 represents a lift coefficient of 1.8 and the 10 designates a thickness/chord ratio of 10%. Figure 6-1 is a sketch of a blade cascade with various angles and profiles defined. The blade angles are designated as p. The chord, b, is the length of the straight line connecting the leading and the trailing edge. The pitch, s, is the measure of the circumferential spacing. Solidity, o, is the relative interference, obtained by the ratio of b/s. Camber, is the curved mean line of the blade as is defined as the angular difference between the

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