Hydraulic Machines Model Acceptance Tests

by Pierre Henry, ETH, Lausanne, Switzerland,

Document Type: Proceeding Paper

Part of: Waterpower '85


The article begins with a description of the modern test installations, giving the dimensions of the models most frequently used and the head heights. Attention is then given to the most modern measuring apparatus for calculating static and dynamic flow, head and torque. The accuracy for these various instruments is demonstrated by practical examples. The various classic tests on reduced models are described. These are: performance (power, output), cavitation, runaway speed, unsteady behavior and strain measurement on the main parts of the machine. Lastly, the article deals with similitude problems and scale effects for predicting the performance of the full-size machine, showing that the accuracy obtained is generally higher than that of measurements made on the prototype.

Subject Headings: Flow measurement | Hydraulic models | Cavitation | Strain | Scale effect | Model accuracy | Equipment and machinery | Scale models

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