A method of incompressible turbulent boundary-layer analysis based on the D parameter introduced by D. Ross is applied to conical-diffuser flow. The separation conditions are shown to depend on the initial momentum-thickness Reynolds number and a distance parameter involving the initial momentum thickness, the initial radius, and the diffuser length. Comparison with experimental information on diffuser separation indicates that the predictions are reliable, but conservative.

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The diffuser length and angle are now defined by Equations ( 6) and ( 12). Thus in the example, using the known value of U./Uo = 0.586 in Fig. 4 the length parameter L 2 is about 6.0 X 10 3 . Therefore

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This paper presents an approach that predicts the resonant frequency of a high-performance dc servomotor. The correlation between this approach and experimentally determined resonant frequencies is good. The design of the armature, the coupling shafts, and the annular couplers is discussed with regard to maximizing the resonant frequency of the motor.