Overview
ABSTRACT
This article studies the hydraulic aspects of the functioning of the turbomachine. The calculation of three-dimensional flows in viscous fluid in turbomachines have significantly improved over the last few years. However, calculation does not suffice to address the three-dimensional, in stationary and viscous nature of the flow. Therefore, the model still remains the only means utilized in order to verify performances related to power, yield or cavitation of the prototype machine. This article starts by dealing with the calculation of the yield and power of the wheel, the study of the behavior at cavitation of the blades of the wheel and the forecast of flow instability in the industrial machine. It ends with an example of a crack in a wheel of a low-headed power plant.
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Louis Raphaël EREMEEF : Former expert engineer at Alstom power hydro's technology center
INTRODUCTION
In this article, we will only examine the hydraulic aspects of turbomachinery operation. Other aspects concerning mechanics or control have already been covered in some articles in the
calculating the efficiency and power output of the impeller ;
study of the cavitation behaviour of impeller blades ;
predicting flow instabilities in industrial machinery.
An example of cracking encountered on a wheel of a low-head power plant will show that industrial problems are still with us.
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Hydraulic turbines - Tests - Cavitation
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