Study of heat protective coatings natural materials


Аuthors

Genbach А. А.1, Bondartsev D. Y.1*, Piralishvili S. A.2

1. Almaty University of Power Engineering and Telecommunications named after G. Daukeev, Almaty, Kazakhstan
2. Rybinsk State Aviation Technical University named after P.A. Soloviev, RSATU, 53, Pushkin St., Rybinsk, Yaroslavl region, 152934, Russia

*e-mail: d.bondartsev@aues.kz

Abstract

Heat transfer studies have been conducted for cooling systems with coatings made of natural materials, depending on the parameters of the detonation flame of a thermal tool and the thermophysical properties of natural materials. The conditions for creation of combustion chambers, nozzles, thermal tools and the principles of spraying the material on the heating surface have been determined. The studies are designed to provide thermal protection of the surface of power plants by cooling them against destruction. Cooling systems with porous coatings of mineral media powders (quartzites, granites, teschenites, tuffs, marbles) had been developed, which were applied on a metal surface at temperatures up to (2500÷3000) 0C and flow rates up to 2500 m/s by hot flames emanating from combustion chambers and nozzles. A power supply circuit for thermal tool has been developed, and the holography and high-speed filming method has been used in the studies. The cost impact per one thermal tool is at least 200–300 dollars and the coolant consumption in the cooling system is drastically reduced, which has an environmental impact. The phenomenon of spin detonation of a flame at an oxidant excess coefficient of less than one has been recorded; the spraying process was intensified by 2 to 6 times. The coatings have shown high reliability compared to other boosted systems. The maximum specific heat flows on the coating are (from 2 to 15×10 6 W/m2) and the oscillation frequency is up to 200 Hz. The position of the flame to the impact surface (structure, braking spot, distance of the burner to the coating) is fixed for the melting mode and without it. The overheating range of the coating was (20÷75) K. The thermodynamic characteristics of oxygen-kerosene thermal tools for generating supersonic hot detonation flames when sprayed in a coating made of natural materials have been established in the model and experimentally; the granulometric composition of materials has been obtained; the hydrodynamic operating modes of the burners have been selected (fuel combustion method, jet length, jet angle). The flight time of the particles, the optimal thickness of the coatings, the diameter of the powder, and the limiting compression and tensile stresses of the coating have been determined. Dependences of displacements for coatings under thermal influence have been obtained, which is important for diagnostics and forecasting of plants and prolongation of service life. 

Keywords:

natural materials, coatings, burner, nozzle, combustion chamber, high-speed filming, interferometry

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