Rapid Determination of Changes in Material Properties of Water Turbines Blades

Abstract

The changes in the material properties of water turbine blades are characterized an undesirable process, which could lead to the end of usable life or to the emergency conditions of this turbine. For this reason, it is important to determine of any material quality changes and continuously monitor them. Considering that, these essential parameters are showing the ability of material to resist the operational stress. It is necessary to choose rapid methods of the material testing which are without preparation of the samples (it is inadmissible to the functional blades) able to immediately monitor the state of the materials by nondestructive methods. Due to mechanical stress and operational wear, the losses and damage occur in the water turbine blades, as the result, it leads to the deformation changes. This article is focused on the methodology of determination mechanical properties of corrosion-resistant steel, which is used on a large scale for the production of hydraulic elements and especially blades of water turbines.

Calculation of the Operational Characteristics of the Impulse Gas-Barrier Face Seal

“…Therefore, we will consider in detail the latest achievements in this of technology development. Usually, friction pairs using the thermo-gas-dynamic principle of operation are used as contact dry mechanical seals [18,19,20,21]. An example is the double seal "Dura Seal GB-200" of "Durametallic Corporation" [22,23,24,25].…”

“…According to the method of calculating the impulse seal on a liquid lubricant [20,21], obtained the equation of the balance of flow rates (1) in terms of conductivity:…”