The Effect of the Shape of the Water-Flow System on the Calculation of Power Parameters

摘要

Modern methods of designing water-pressure engines incorporate the characteristics of axial flow pumps or performance curves of insulated propellers. The disadvantage of these methods is the lack of reliable data on the interaction between the engine and the hull of the fireboat, which are determined experimentally. This article cites data characterizing the interaction between the engine and the hull obtained in tests with a largescale model of a double-shaft fireboat with different shapes of the suction duct. It has been shown that this form has a substantial effect on the propulsive capacity of the power complex. The basic experimental relations are presented in dimensionless magnitudes in the form of diagrams that can be used in planning and designing water-pressure engines by the 'equivalent propeller' method. (Author)