No abstract

CFD has the potential of assisting an engineer in arriving at improved designs. However, to be effective, this requires a much closer cooperation and mutual understanding between the pump specialist and the expert in CFD, than it is presently in existence. This conclusion is based on actual case histories from past experience, as well as considerations of the physical meaning of certain mathematical expressions. The presented discussion relates, primarily, to the design of centrifugal pumps. However, there are strong indications that analogical situations exist also in other fields of fluids engineering.

This paper discusses the present state of knowledge of the manner in which the impeller geometry affects the developed head. A comparison with test results shows a very impressive agreement between theory and practice.

This paper discusses the practical significance of the recent finding that the amount of liquid which is directly affected by a blade appears to be of the same order of magnitude as the volume which the blade is displacing. The paper discusses, primarily, cases related to rotodynamic pumps, but it is emphasized that this finding is also applicable to a wide spectrum of additional disciplines.

This paper explains why Euler's equation and the airfoil theory, while analytically correct, sometimes produce disappointing results. It also emphasizes the merits of a recently developed approach and demonstrates its usefulness in solving problems encountered in practice. The subject matter relates, directly, only to rotodynamic pumps. However, with proper modi cations, it can be easily expanded to other uids machines.