Discussion: "Optimum Vane Number and Angle of Centrifugal Pumps With Logarithmic Vanes" (Reddy, Y. R., and Kar, S., 1971, ASME J. Basic Eng., 93, pp. 411–422)

A. Kovats
1971 Journal of Basic Engineering  
To estimate the optimum number of vanes and the blade angle of the centrifugal pump having the following dimensions (see reference [15] for the design of main dimensions). Di -5.8 cm; Di = 20.8 cm; h = 2.2 cm; b 2 = 0.7 cm; iV = 2880 rpm; H = 42 M; Q = 10.43 lps; X = 0.05. Equation (25) reduces to (assuming volumetric efficiency of 95.6) = Z 0.0109 1.39 (, 35 + 2.36 (28) :.8; n -{x -,T. 2 )2810 when x = 0.7925, m = 4.8, and n = -462 Equation (18) results in Z = 6.61 ~ 7 The value of x = 0.7925,
more » ... alue of x = 0.7925, Z = 7 satisfy the equation (28) Hence cos 2 /3 = 0.7925 or 0 = 27.3 deg .'. Optimum number of blades = 7 and angle = 27.3 deg
doi:10.1115/1.3425264 fatcat:5dxg4vg6mrehfgxdcyuityeyze