The problem of creating effective structures that ensure mutual rotation of the rotor and stator of an electric generator. The wide practical application of counter-rotor wind-electric generators, which provide a significant increase in specific power, is hindered by the disadvantages and low reliability of existing systems for removing electric energy from the windings of a rotating counter-rotor, due to the dry friction mode. It is possible to increase the reliability of the contact removal of electrical energy from the counter rotor (rotating stator) by replacing solid brushes with liquid metal contact groups, which will lead to a certain increase in the resistivity of the contact group, compensated by the contact area of the liquid metal with the contact ring. It is most advisable to use liquid metal contact groups based on gallium, which will raise the permissible temperature limit of operation by about 2 times compared to the achieved level to 275 °C and, thereby, additionally raise the specific power of the electric generator.

This paper reports the results of study of the influence of gas content in working fluid on the dynamics of hydraulic drive of equipment for oil and gas well development. A mathematical model of the hydraulic drive obtained in the Cauchy form is proposed. The dependence of piston speed, pressure in the piston chamber of the hydraulic cylinder, and pressure in the rod chamber of the hydraulic drive on time at 0 and 8% undissolved gas content in the fluid is established.

In this paper we consider the causes of environmental problems of large cities, the impact of transport and technological activities on air pollution. The comparative dynamics of changes in the number of cars in Russia and other countries. The approximate component composition of exhaust gases for carburetor and diesel engines and the conditions of formation of the most toxic substances are analyzed. The reasons of the greatest pollution of the atmosphere by activity of transport and technological infrastructure in the Russian Federation in comparison with the Western countries are revealed. The structure of the automobile fleet of the Russian Federation on norms of toxicity. The ways of minimizing the impact of vehicles on the ecology of megacities by improving the quality of fuel and abandoning the no-alternative monopoly on diesel fuel are proposed. The necessity of modern technologies of oil and gas processing, expansion of opportunities of the fuel market of the country, improvement of its quality and environmental friendliness is revealed. Prospects of use of gas motor fuel are defined.

No abstract

No abstract