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Non-contact gas bearings, oil-free mechatronic components and transmissions

Operational characteristics of gas turbine equipment (the main engines, auxiliary power units, on-board and ground-based power plants. Refusal of oil increases by 5-10% fuel efficiency, reduces by 20-25% the cost of installation, eliminates the operational costs associated with the need to replace oil. The purpose: development of hybrid gas-bearing units and mechatronics that combine advantages of gas-static and gas-dynamic bearings. These units operate fully contactless mode since the motor shaft is first posted, and then later unwound. Such systems are the absolute fire safety, theoretically infinite service life. The work is coordinated with the UEC, the Joint instrument-making corporation, OAO Tupolev. It is expected the creation of systems for gas turbines in dimension from 100 to 2000 kW.

 

 

Nanostructuring of shock waves and hardening of metals, additive technology

It is now well-developed various technology heat treatment of metals, coating a variety of ways: Plasma gas-jet, ion sputtering, laser fusing, etc. Nevertheless, there is a large amount of unsolved problems. They include strengthening the individual structural elements and parts with complex shapes or large sizes. Hardening of surfaces with microscopic cavities and holes or with particularly stringent requirements for precision geometry. Conventional spraying or fusing a reinforcing material leads to a "clogging" of containers and openings as well as distortion of the hardenable surface. One of the ways to solve the problem - the hardening of the material periodic shock wave field, ie, Hardening occurs in the surface layer of the material, rather than adding to it the coating.

The object of research is the development of technologies for creating of the high-strength nanoscale surface films by resonant wave action.
The method consists in the crystal lattice structure change in a thin surface layer of the metal by the influence of unsteady shock-wave structures.
We consider two variants of the technology realization: using acoustic resonators and the impact of the supersonic jets on metal.

 

Fig.1. Shock-wave method surface hardening installation.

Very promising is the use of pulsating flows in thermoacoustic metals, powder metallurgy, air dispersion devices , gas metal cutting , as well as in other branches of science and technology.

In metallurgy, there are a number of processes associated with the use of supersonic gas jets. In steelmaking, they are used in the converter and open-hearth furnaces.

The purpose of the control jets in metallurgical plants is the formation of jet streams with the necessary characteristics for the intensification of heat - and mass transfer processes. Control means controlling actions should be as simple as possible, as well as low-power. For management purposes, it is important to have a process physically unstable, with a non-unique state.

Satisfies these requirements process of propagation supersonic jets in channels with sudden expansion of the cross-section, which is a wide range of changes in the underlying parameters is unsustainable, accompanied by pressure fluctuations and the wave structure of the jets. First task of studying the oscillations in a cylindrical channel set in 1967 Jungowski WM These works are carried out in collaboration with the NGO "Special materials", JSC "Tupolev" and TTC "Pendant", Kingston University (London).