Abstract
In this paper, the following problems are discussed. 1. The discharge-head characteristics of an axial-flow pump are analysed empirically, and the coefficients of energy losses in guide vanes, suction and delivery pipes are determined. 2. Experimental studies are performed about the circulating flows on the suction and delivery sides of impeller blades of some different types, which affect seriously the shaft horse-power performance at low flow rates. The coefficients of head loss and the velocity coefficients of the circu1ating flow are derived in the same relation, regardless the different types of impellers. 3. Types of an axial-flow pump impeller which should have an excellent performance at partial capacities are estimated.
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