Download Abrasive Erosion and Corrosion of Hydraulic Machinery by C. G. Duan, V. Ia Karelin PDF

By C. G. Duan, V. Ia Karelin

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

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Example text

At a < 30° the soft steel erosion rate falls down again, which results from a continuous decrease, taking place in the normal component of the impact strength. The rubber erosion rate rises drastically at a < 64°, and at a = 28°, it already exceeds the erosion rate in the other materials tested (curve 3 is placed above curves 1 and 2). At small angles of incidence the rubber ability to absorb kinetic energy of solid particles reduces, which results in the material failure. The experimental results obtained have illustrated that during alterations of incidence angles in the range 15° to 90°, the phenomena observed may allegedly be classified as an inversion of erosion resistance resulted from alterations in the external influence pattern affecting the surface layer.

5 year of operation. Visual inspection of these blades has revealed that their surfaces are covered with multiple cavities measuring 10x20 mm in area and up to 6 mm in depth, formed as a result of the effect exerted by cavitation and sediment matter. In addition to the damage of impellers the motionless components in the hydraulic machines were deteriorated as well. An illustrative example of this is found in the surface failure, which took place in the impeller case of a large propeller-type pump.

87%. The increased leakage value brings about a decline in Fundamentals ofHydroabrasive Erosion Theory 31 both the volumetric and hydraulic efficiencies of a turbine. Besides, such leakage causes the reduction of the turbine head and creates fluctuations in its operation. Consequently, the total efficiency falls in the turbine become higher. The effect caused by the erosion of the guide device components as applied to the turbine efficiency, should be considered as most insignificant. As the guide device is being worn, the tailpieces in the blades become thinner and furrows appear on the working faces of the blades in the direction of the water flow line.

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