Effect of zirconium,calcium, and barium on corrosion-electrochemical behavior of aluminum

The effect of zirconium, calcium, and barium on corrosion-electrochemical properties of aluminum was studied. A positive effect of alloying aluminum by these metals was revealed.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 11, 2004, pp. 1815–1818.Original Russian Text Copyright © 2004 by Ganiev, Barotov, Inoyatov.     

Effect of fluid flow on cavitation erosion of materials under exposure to vibrations from a hydrodynamic generator

The results of investigation of cavitation erosion of lead in various places of a hydrodynamic-generator submerged jet are presented. Features of erosion caused by the effect of flow are established. It can both strengthen the erosion intensity and weaken it in dependence on the angle of incidence. The stratification of air bubbles under the action of pressure waves is possible in the flow under the interaction with the surface of objects. The flow can change the number of air bubbles participating in the cavitation near the surface. It can also influence the mechanical effect on the surface of the tested materials inducing their nonuniform deformation. All the factors listed affect the cavitation erosion complicating considerably the physics of the process.     

Nonlinear Wave and Cavitation Processes and Their Effect on the Mechanical Properties of Viscous Solutions

Doklady Physics - This paper presents the experimental results of studying the effect of nonlinear wave and cavitation processes occurring in the working elements of a flow in hydrodynamic vortex-...     

Anodic behavior of Zn5Al and Zn55Al alloys alloyed with calcium in NaCl solutions

Results of a study of the anodic behavior of Zn5Al and Zn55Al alloys alloyed with calcium in a NaCl electrolyte are presented.     

Bifurcation of resonance during flutter of the blades of a turbocompressor rotor

Bifurcation of the trajectory of the resonance of rotor blades of an axial turbocompressor leading to flutter of the blade cascade is investigated. The investigation is based on spectral analysis of the records of the transient process of the blades. It is shown that in contrast to the resonance, which has a constant phase difference between the excitation and forced oscillations of the blades, the phase shift of collective synchronous vibrations of the blades during the flutter depends on their number and the form of the diametral mode of the blade cascade. It is formed by one of the pulsation modes of the pressure of air flow.