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

By C. G. Duan, V. Ia Karelin

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

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

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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.

The spiral case of circular shape in its cross section is fabricated from cast iron and designed to include bosses for the accommodation of the stator columns. The inner surface in the spiral case is covered with insignificant fine-scaly erosion, with the exception of the spiral lower area at the approach to the stator columns, where this erosion turns to become large-sized scaly and deepened. The bosses fabricated in the spiral for accommodation of the stator columns are subjected to significant erosion.

The surface layer in rubber specimens (curve 3) absorbs, at the present flow velocity of particles moving with a = 90°, the greater part of the kinetic energy possessed by abrasive particles, and the rubber in this case erosions out slower, as compared with the other material, While the erosion rate in hardened steel specimens reduces with decrease of the attack angles, which is caused by gradual reduction of the normal impact strength component, the deterioration process, which develops with Fundamentals of Hydroabrasive Erosion Theory 19 reference to the steel and rubber, is accompanied at certain values of an angle of incidence, with qualitative changes.

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