ISSN 1991-2927
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## Keyword: "thermal protection"

 A.N. Zolotov, V.N. Kovalnogov, R.V. Fedorov
 Software and information system for analyzing the thermal state of turbine machine bladesIncreased input parameters of the pressure and temperature of the working fluid in gas turbine installations result in the complex gasdynamic and temperature operation modes of the blade apparatus, but it is the principal tool for improving the energy efficiency of gas turbine installations in general. Applying the efficient methods of mathematical modeling and numerical study of gas-dynamic processes of a turbine machine may simplify this process and reduce financial costs. The article considers the main methods of increasing the energy efficiency of modern gas turbine machines are considered. One of the implementation ways is the use of software systems for calculating the thermal state of turbine machine blades. Numerical modeling, thermal protection, convective film cooling, software and information system, dispersed flow, gasdynamic temperature stratification.
 2020_ 4

Sections: Mathematical modeling

Subjects: Mathematical modeling.

 V. Kovalnogov, R. Fedorov, L. Khakhaleva, A. Chukalin
 Mathematical Modeling and Numerical Analysis of Thermal Protection Effectiveness With Hemispherical Damping Cavities The gas turbine engine performance improvement is linked inextricably with the increase of the intensity of dynamic, aeromechanical and thermal processes, which, in turn, requires the development of systems and devices allowing to protect the most loaded equipment components. The most effective ways to protect surfaces from overheating are a convective cooling; the absorption and accumulation of heat by condensed substances; the cooling that operates on mass transfer principle; the radiation and electromagnetic cooling; heat-shielding coatings. One of the most effective ways to protect surfaces from overheating is a thermal protection in the form of film-like surface cooling based on the mass-transfer surface-cooling principle. This method is widely distributed and it proved to be effective. The paper considers the possibility of improving this method of cooling due to the impact on the boundary layer with hemispherical damping cavities behind the injection section of the cooler. A mathematical model is proposed, the numerical study of the thermal protection effectiveness by the use of hemispherical damping cavities is carried out. The possibility of a significant decrease of the turbulent heat exchange in the boundary layer and of the efficiency improvement of the thermal surface protection of ? by0.06 due to the use of hemispherical damping cavities has been established. The proposed method of thermal protection intensifying and numerical analysis of its efficiency will improve the gas turbine engines that are available for different applications of domestic industry for example in power generation sector, aircraft engineering as well as in shipbuilding.Hemispherical damping cavities, turbulent transport, mathematical modeling, boundary layer, thermal protection.
 2018_ 4

Sections: Mathematical modeling

Subjects: Mathematical modeling.

 V. Kovalnogov, D. Generalov, A. Chukalin, R. Fedorov, A. Plekhanova
 New Engineering Solutions Based on Mathematical Modelling of the Turbine Blade System The article deals with a method for studying the thermal state of turbomachine blades and a numerical investigation method taking into account the phenomenon of gas-dynamic temperature stratification. The authors consider the possibility of increasing the efficiency of cooling turbine blades due to the phenomenon of gas-dynamic temperature stratification, the possibility of improving the accuracy of the calculated forecasting of the thermal state of the blades by obtaining reliable data by developing a mathematical model and a unique software and information complex for modelling.Mathematical modelling, numerical methods, thermal protection, film cooling, software and information complex, dispersed flow.
 2017_ 3

Sections: Mathematical modeling

Subjects: Mathematical modeling.

 A. Zolotov, V. Kovalnogov, M. Kornilova
 Modeling and Researching the Technique of Thermal Protection of Turbomachines Blades With the Use of Gas-dynamic Temperature Stratification Raising the initial temperature and pressure of the working fluid is one of the simplest and most effective ways of improving fuel efficiency and reducing metal consumption of turbines. Traditional technology of turbine blades production is quite cost and time consuming in production. Therefore, their creation requires the use of mathematical models which serve as a tool for analysis, improvement and selecting the most promising solutions of the refrigeration and increase of the prediction accuracy at the design stage of their effectiveness. Mathematical modeling of the thermal state is widely used in the creation of modern gas turbines [1]. An important objective is the numerical simulation of the spatial flow of the heat transfer in subsonic and transonic lattices. In order to create effective ways of thermal protection, it is necessary to know the distribution of nonstationary temperature fields on the surface and in the body of the scapula. For this purpose, the heat flows from the gas to the blades must be accurately determined taking into account the impact of the mode of flow, thermals, pressure gradient, and other factors [2]. In the paper, the proposed mathematical model and method of numerical investigation of the thermal state of blades of turbomachines streamlined by a supersonic dispersed flow with regard to the phenomenon of gas-dynamic temperature stratification was proposed. With the aim to increase the accuracy of the settlement prediction of the thermal state of blades due to obtaining reliable data as well as improve the efficiency of cooling systems to increase the service life of the blades, the authors have developed the program-informational complex which will take into account the results of studies of gas-dynamic processes in high- speed, disperse flows including the phenomenon of gas-dynamic temperature stratification carried out at the Department of Heat Power Engineering at Ulyanovsk State Technical University.Mathematical modeling, numerical methods, thermal protection, convective-film cooling, software and information complex, dispersed flow, gas-dynamic temperature stratification.
 2015_ 4

Sections: Mathematical modeling

Subjects: Mathematical modeling, Computer-aided engineering.

 R. Fedorov, D. Generalov, M. Kornilova
 Mathematical Modeling and Numerical Analysis of a Thermal State of Turbo-mashine Blades Affected By a Supersonic Dispersed Flow The development of the advanced gas-turbines must ensure their operation under the conditions of an increasing temperature of a working body to improve the efficiency during in a reliable and efficient operation. In this paper, a mathematical model and a method of a numerical research of a thermal state of turbo-machine blades affected by a supersonic dispersed flow including a gas-dynamic temperature stratification phenomenon are introduced. The adequacy of a turbulent dispersed boundary layer model was verified by comparing the calculation of the heat transfer coefficients of the dispersed flow in the nozzles with the experimental data. In order to improve the accuracy of the calculated prediction of the thermal state of the blades due to obtaining the reliable data, as well as the efficiency of cooling systems for the increasing resource of the blades, a software and information complex integrated into the Solid Works package is currently being developed on the base of the Turbo Works package at the Department of Heat Power Engineering of Ulyanovsk State Technical University. The research results of the temperature stratification will be included into this software and information complex as a unique information base. As the analysis of the numerical study results shows, the application of the developed convective-film cooling temperature provides the temperature reduction to the trailing edge of the turbo machine blade by 1.6 times compared with the convection cooling.Mathematical modeling, numerical methods, thermal protection, convective-film cooling, software and information complex, dispersed flow.
 2014_ 4

Sections: Mathematical modeling

Subjects: Mathematical modeling.

 V. Kovalnogov, A. Korolev, R. Fedorov
 Mathematical Modeling and Numerical Analysis of Efficiency of Surface Film Coolingin Supersonic Flow Dispersion The article provides a mathematical model and results of computational investigations into the effect of the inertial deposition of particles of condensed phase on the efficiency of film cooling of surface in supersonic flow dispersion. The authors determine a possible realization of Leontyev paradox in adiabatic surface area, which consists in achieving protected surface temperature less than that of cooler in permeable area of protection creation.Boundary layer, thermal protection, mist flow, modeling.
 2012_ 4

Sections: Mathematical modeling, calculi of approximations and software systems

Subjects: Mathematical modeling.

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