By C. G. Duan, V. Ia Karelin

ISBN-10: 1860943357

ISBN-13: 9781860943355

This booklet supplies a scientific exposition of abrasive erosion and corrosion of hydraulic equipment in either concept and engineering perform, and is the 1st accomplished quantity to hide this sector intensive.

All the real matters are mentioned together with basics, calculation, research and numerical simulation of liquid–solid move layout, erosion-resistant fabrics, interplay among cavitation and abrasive erosion, and corrosion of hydraulic equipment.

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In the region of the flow turn; * inner face of the front disk (it is worn more uniformly and significantly less than the front disk). The components being worn in axial-flow and mixed-flow pumps, with closed-type impellers, are as follows: * working surfaces of blades, in which the erosion intensity increases in the direction towards the trailing edges; * end face edges of bladesas a result of the erosion caused by a slitshape cavitation, with the sharply increased intensity when the water contains abrasive particles; * rear surfaces of blades in the areas adjacent to the leading edges, due to vortex-type streams flowing around the blade in non-specified operations.

The entire working surface areas in these blades are covered with grooves and cuts of the indicated shape. This results, probably, from mutual action of cavitation being formed by the surface unevenness and suspended matter present in the area of the pulsation cavity. The joint effort exerted by both the sediment matter and cavitation resulted in deterioration of entire blade areas. At the completion of one year of operation, in the water including suspended sediment particles, there are cases of complete absence of edges in the pump blades within the area reaching up to 5 cm in width.

In addition to mass, governed by such parameters as size and density, and hardness, another factor of great significance is the shape of moving abrasive particles. It is known that solid particles with sharp sides are especially hazardous in the sense of their ability to deteriorate the surface circumvented by the flow. But to evaluate this factor quantitatively, with respect to its effect on erosion intensity, is extremely difficult, since the particle shapes. As a rule, vary continuously as a result of mutual collisions and their friction against the surfaces restraining the flow.

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Abrasive erosion & corrosion of hydraulic machinery by C. G. Duan, V. Ia Karelin

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