By C. G. Duan, V. Ia Karelin

ISBN-10: 1860943357

ISBN-13: 9781860943355

A scientific exposition of abrasive erosion and corrosion of hydraulic equipment in either thought and engineering perform. all of the very important topics are mentioned together with basics, calculation, research and numerical simulation of liquid-solid movement layout, erosion-resistant fabrics, interplay among cavitation and abrasive erosion, and corrosion of hydraulic equipment.

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Moreover, the partial erosion in the latter affects the performance of a pump in a lesser degree. With reference to the combined effect produced on the pump components by both the cavitation process and the solid particles contained in the liquid transferred, it should be noted that to ascertain the exact boundaries of the areas subjected to the cavitational-abrasive erosion is rather difficult in practice, since in operational conditions one of the two erosion patterns is predominate, as a rule, over the other, therefore, the erosion subjected surface possesses distinctive features characteristic of one of them.

The greatest interest, in this regard, refers to the local pressure fall, which causes emergence of local cavitation zones. Although the influence level of these zones on the energy quality and vibration state of a pump assembly is insignificant, they may become, nevertheless, a source of intensive erosion. The impellers in the impeller pumps of all types are the elements subjected to the cavitational erosion most greatly, due to the hydrodynamic processes which develop in them. It is estimated that for the optimum behavior, with due regard for the meridian and circumferential constituents, the relative flow velocity, at the inlet to the interblade channels of the impeller, is equal to 20 ~ 45 m/s, depending on the standard size of a device.

The attrition of a runner, effected by sediment matter, develops within its entire surface flown around by the stream, yet the area being most damaged is distributed at the trailing edges of the blades. The erosion action produced by the sediment matter is amplified by cavitation erosion; while the working surfaces in the blades are subjected to the erosion produced by sediment matter, their rear sides are mainly influenced by cavitation attack. The combined effect produced by sediment matter and cavitation results in disappearance of entire trailing edge of the blade.

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Abrasive Erosion and Corrosion of Hydraulic Machinery (Series on Hydraulic Machinery) by C. G. Duan, V. Ia Karelin

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