ISSN 1991-2927
 

ACP № 2 (56) 2019

Author: "Vladislav Nikolaevich Kovalnogov"

Vladislav Nikolaevich Kovalnogov, Ulyanovsk State Technical University, Doctor of Science in Engineering; graduated from Kazan State University; Head of the Department of Heat Power Engineering at Ulyanovsk State Technical University; an author of articles, monographs, and inventions in the field of modeling, research and optimization of hydrogasodynamic processes in power plants and manufacturing equipment. [e-mail: kvn@ulstu.ru]V. Kovalnogov,

Ruslan Vladimirovich Fedorov, Ulyanovsk State Technical University, Candidate of Science in Engineering; graduated from Ulyanovsk State Technical University; Associate Professor of the Department of Heat Power Engineering of UlSTU; an author of articles and inventions in the field of numerical modeling of hydrogasodynamic processes. [e-mail: r.fedorov@ulstu.ru]R. Fedorov,

Larisa Valerievna Khakhaleva, Ulyanovsk State Technical University, Candidate of Science in Engineering; graduated from Ulyanovsk State Technical University; Associate Professor of the Department of Heat Power Engineering of UlSTU; an author of articles and inventions in the field of numerical modeling of hydrogasodynamic processes. [e-mail: larvall@mail.ru]L. Khakhaleva,

Andrei Valentinovich Chukalin, Ulyanovsk State Technical University, graduated from Ulyanovsk State Technical University; Postgraduate Student at the Department of Heat Power Engineering of UlSTU; an author of articles and inventions in the field of numerical modeling of hydrogasodynamic processes. [e-mail: chukalin.andrej@mail.ru]A. Chukalin

Mathematical Modeling and Numerical Analysis of Thermal Protection Effectiveness With Hemispherical Damping Cavities 54_10.pdf

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.


Vladislav Nikolaevich Kovalnogov, Ulyanovsk State Technical University, Doctor of Engineering; Head of the Department of Heat Power Engineering of Ulyanovsk State Technical University; graduated from Kazan State University; an author of articles, monographs, and inventions in the field of simulation, research, and optimization of thermal and hydrogasdynamic processes in power installations and processing equipment. [e-mail: kvn@ulstu.ru]V. Kovalnogov,

Dmitrii Aleksandrovich Generalov, Ulyanovsk State Technical University, Senior Lecturer at the Department of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles and inventions in the field of numerical modelling of hydrogasdynamic processes. [e-mail: dmgeneralov@mail.ru]D. Generalov,

Andrei Valentinovich Chukalin, Ulyanovsk State Technical University, Postgraduate Student at the Department of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles and inventions in the field of numerical modelling of hydrogasdynamic processes. [e-mail: chukalin.andrej@mail.ru]A. Chukalin,

Ruslan Vladimirovich Fedorov, Ulyanovsk State Technical University, Candidate of Engineering, Associate Professor at the Department of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles and inventions in the field of numerical modelling of hydrogasdynamic processes. [e-mail: r.fedorov@ulstu.ru]R. Fedorov,

Anna Alekseevna Plekhanova, Ulyanovsk State Technical University, Forth Year Student of the Thermal and Heat Engineering Course of the Power Faculty at Ulyanovsk State Technical University. [e-mail: nyutka73@mail.ru]A. Plekhanova

New Engineering Solutions Based on Mathematical Modelling of the Turbine Blade System 000_6.pdf

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.


Vladislav Nikolaevich Kovalnogov, Ulyanovsk State Technical University, Doctor of Engineering, Head of the Department of Heat Power Engineering of Ulyanovsk State Technical University; graduated from Kazan State University; an author of articles, monographs, and inventions in the field of simulation, research, and optimization of thermal and hydrogas-dynamic processes in power installations and processing equipment. [e-mail: kvn@ulstu.ru]V. Kovalnogov,

Andrei Valentinovich Chukalin, Ulyanovsk State Technical University, Postgraduate Student at the Department of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles and inventions in the field of numerical modelling of hydrogasdynamic processes. [e-mail: chukalin.andrej@mail.ru]A. Chukalin,

Larisa Valerevna Khakhaleva, Ulyanovsk State Technical University, Candidate of Engineering, Associate Professor at the Department of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles and inventions in the field of numerical modelling of hydrogas-dynamic processes. [e-mail: larvall@mail.ru]L. Khakhaleva,

Ruslan Vladimirovich Fedorov, Ulyanovsk State Technical University, Candidate of Engineering, Associate Professor at the Department of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles and inventions in the field of numerical modelling of hydrogas-dynamic processes. [e-mail: r.fedorov@ulstu.ru]R. Fedorov,

Anna Alekseevna Plekhanova, Ulyanovsk State Technical University, Third Year Student of the Thermal and Heat Engineering Course of the Power Department at Ulyanovsk State Technical University. [e-mail: nyutka73@mail.ru]A. Plekhanova

Researching the Influence of the Number of Damping Cavities on Frictional Resistance of Turbulent Flow 000_5.pdf

As a result of experimental and numerical research of turbulent flow with effects on the basis of the modified model of the Prandtl mixing length with the use of pressure pulsation analysis, the structure and resistance of turbulent flow frictional resistance were calculated. The developed model of turbulent exchange and the calculation method allow to take adequately into account the features of the metabolic processes in the presence of damping cavities and predict the frictional resistance with the help of preliminary calculation. The possibility of reduction of the frictional resistance coefficient of a turbulent flow to 35 % was experimentally set with the use of damping cavities. The generalization of the influence of the amount of damping cavities on the frictional resistance was carried out.

Damping cavities, mathematical modelling, frictional resistance, turbulent flow.

2017_ 1

Sections: Mathematical modeling

Subjects: Mathematical modeling.


Aleksandr Nikolaevich Zolotov, Post-graduate Student at the Department of Heat-and-Power Engineering of Ulyanovsk State Technical University; graduated from Ulyanovsk State Technical University; graduated from Ulyanovsk State Technical University; an author of articles in the field of the numerical modeling of gas-dynamic processes. [e-mail: anzolotov@bk.ru]A. Zolotov,

Vladislav Nikolaevich Kovalnogov, Ulyanovsk State Technical University, Doctor of Engineering, Head of the Department of Heat-and-Power Engineering of Ulyanovsk State Technical University; an author of articles, monographs, and inventions in the field of simulation, research, and optimization of thermal and gas-dynamic processes in power installations and processing equipment. [e-mail: kvn@ulstu.ru]V. Kovalnogov,

Maria Igorevna Kornilova, Ulyanovsk State Technical University, a second-year student of Ulyanovsk State Technical University; an author of articles in the field of the numerical modeling of gas-dynamic processes. [e-mail: masha.kornilova.1995@mail.ru]M. Kornilova

Modeling and Researching the Technique of Thermal Protection of Turbomachines Blades With the Use of Gas-dynamic Temperature Stratification 000_12.pdf

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.


Vladislav Nikolaevich Kovalnogov, Doctor of Engineering, Head of the Department of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles, monographs, and inventions in the field of simulation, research, and optimization of thermal and hydro-gas-dynamic processes in power installations and processing equipment. [e-mail: kvn@ulstu.ru]V. Kovalnogov,

Ruslan Vladimirovich Fedorov, Ulyanovsk State Technical University, Candidate of Engineering, Associate Professor at the Department of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles and inventions in the field of numerical modeling the hydro-gas-dynamic processes. [e-mail: r.fedorov@ulstu.ru]R. Fedorov,

Larisa Valerievna Khakhaleva, Ulyanovsk State Technical University, Candidate of Engineering, Associate Professor at the De-partment of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles and inventions in the field of numerical modeling the hydro-gas-dynamic processes. [e-mail: larvall@mail.ru]L. Khakhaleva,

Andrei Valentinovich Chukalin, Ulyanovsk State Technical University, Post-graduate Student at the Department of Heat Power Engineering of Ulyanovsk State Technical University; an author of articles and inventions in the field of numerical modeling the hydro-gasdynamic processes. [e-mail: chukalin.andrej@mail.ru]A. Chukalin

Mathematical Modeling and Numerical Analysis of Flow Laminarization in a Perforated Tube With Damping Cavities 000_13.pdf

The authors have experimentally established the possibility of the partial turbulent flow laminarization in a perforated tube with damping cavities which leads to reduction of up to 35% of frictional resistance. The effect of the number of perforations in the damping cavity on the velocity profile and the frictional resistance has been revealed. The model of turbulent transfer in a boundary layer near the perforated surface with damping cavities and the method of calculating the flow pattern and frictional resistance were proposed. Flow laminarization manifested itself as the decrease of turbulent transfer intensity in the boundary layer due to external or internal influences plays an important role in engineering. Apparently, for the first time the possibility of a reverse transition of a turbulent flow in a laminarization one under the influence of a negative longitudinal pressure gradient was noted in the article [1]. Further researches overviewed in the paper [2] have demonstrated that laminarization in flows with negative longitudinal pressure gradient is accompanied by a substantial (up to 35 ... 50%) decrease of the intensity of heat and a simultaneous increase in the frictional resistance. The model of laminarization in the streams with different influences proposed in the paper [2] has allowed to predict the possibility of its implementation and anear perforated surface with damping cavities. As this takes place, in contrast to the laminarization under the influence of a negative longitudinal pressure gradient there must be a reduction of both the intensity of heat transfer and friction resistance. The purposes of this work are experimental investigation of frictional resistance in the perforated tube with damping cavities with a different number of perforations, the development of turbulent transfer process models and the calculation method of friction resistance.

Perforated pipe, a damping cavity, turbulent transfer, mathematical modeling, friction resistance.

2015_ 4

Sections: Mathematical modeling

Subjects: Mathematical modeling.


Vladislav Nikolaevich Kovalnogov, Ulyanovsk State Technical University, Doctor of Engineering, graduated from the Faculty of Computational Mathematics and Cybernetics at Kazan State University, head of the Heat and Power Engineering Chair at Ulyanovsk State Technical University; author of articles, monographs, inventions in the field of modeling, research and optimization of hydrogasodynamic processes [e-mail: kvn@ulstu.ru]V. Kovalnogov,

Ruslan Vladimirovich Fedorov, Ulyanovsk State Technical University, Candidate of Engineering, graduated from the Faculty of Power at Ulyanovsk State Technical University, Associate Professor of the Heat and Power Engineering Chair at Ulyanovsk State Technical University; author of articles, monograph and inventions in the field of modeling and research into gas dynamics of high-speed disperse flows [e-mail: r.fedorov@ulstu.ru]R. Fedorov,

Ekaterina Vladimirovna Tcvetova, Ulyanovsk State Technical University, Graduated from the Faculty of Power at Ulyanovsk State Technical University, post-graduate student of the Heat and Power Engineering Chair at Ulyanovsk State Technical University; author of articles and research studies in the field of gas dynamics and heat exchange [e-mail: katf0k@mail.ru]E. Tcvetova,

Anton Viacheslavovich Petrov, Ulyanovsk State Technical University, Student of the Faculty of Power at Ulyanovsk State Technical University ; author of articles and research studies in the field of gas dynamics and heat exchange [e-mail: Antonio-petrik2@mail.ru]A. Petrov

Mathematical Modeling and Investigation of Effectiveness of Gas-dynamic Temperature Stratification in Disperse Flow 31_7.pdf

The article gives a method and results of a numerical investigation of the process of gas-dynamic temperature stratification in disperse flow. It justifies an opportunity to significantly increase the efficiency of temperature stratification of dispersed flow via heat transfer surface enhancers made on the working surface of the subsonic flow path.

Gas-dynamic temperature stratification, disperse flow, supersonic flow, heat transfer enhancement.

2013_ 1

Sections: Mathematical modeling, calculi of approximations and software systems

Subjects: Mathematical modeling.


Vladislav Nikolaevich Kovalnogov, Ulyanovsk State Technical University, Doctor of Engineering, graduated from the Faculty of Computational Mathematics and Cybernetics at Kazan State University, head of the Heat and Power Engineering Chair at Ulyanovsk State Technical University; author of articles, monographs, inventions in the field of modeling, research and optimization of hydrogasodynamic processes [e-mail: kvn@ulstu.ru]V. Kovalnogov,

Yury Andreevich Khakhalev, Ulyanovsk State Technical University, Graduated from the Faculty of Power at Ulyanovsk State Technical University, postgraduate student of the Heat and Power Engineering Chair at Ulyanovsk State Technical University; author of articles and research studies in the field of hydrogasodynamic processes [e-mail: ulstu-td-ua@mail.ru]Y. Khakhalev

Mathematical Modeling of Turbulent Flow Based on Analysis of Fractal Dimension of Pressure Fluctuations 31_8.pdf

The article defines the fractal dimension of turbulent pressure fluctuations on the basis of theoretical and experimental studies. It offers a mathematical model for turbulence based on the fractal characteristics of pulsations.

Boundary layer, pressure fluctuations, turbulent flow, model, chaos, fractal characteristics.

2013_ 1

Sections: Mathematical modeling, calculi of approximations and software systems

Subjects: Mathematical modeling.


Vladislav Nikolaevich Kovalnogov, Ulyanovsk State Technical University, Doctor of Engineering; holds the Chair 'Heat and Power Engineering' at Ulyanovsk State Technical University; author of articles, monographs, inventions in the field of numerical modeling of hydrogasodynamic processes [e-mail: kvn@ulstu.ru]V. Kovalnogov,

Alexey Vladimirovich Korolev, Ulyanovsk State Technical University, post-graduate student at the Chair 'Heat and Power Engineering' of Ulyanovsk State Technical University; author of articles and inventions in the field of numerical modeling of hydrogasodynamic processes [e-mail: korolev86@inbox.ru]A. Korolev,

Ruslan Vladimirovich Fedorov, Ulyanovsk State Technical University, Candidate of Engineering; Associate Professor at the Chair 'Heat and Power Engineering' of Ulyanovsk State Technical University; author of articles and inventions in the field of numerical modeling of hydrogasodynamic processes [e-mail: r.fedorov@ulstu.ru]R. Fedorov

Mathematical Modeling and Numerical Analysis of Efficiency of Surface Film Coolingin Supersonic Flow Dispersion 30_4.pdf

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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