Features of swirling flow of GENERALIZED NEWTONIAN FLOW in a circular tube// Transactions of Academenergo. 2016. №3. p. 11-22.
B.R. Abaydullin, A.I. Kadyirov
e-mail: cyberincorp@mail.ru
FSBIS Kazan Scientific Center of the Russian Academy of Sciences
Keywords: swirling flow, twisted tape inserts, laminar flow, pseudoplastic fluid, Na-CMC, rheological constant
Abstract
The numerical results of the influence of pseudoplastic fluid properties on decaying swirl flow through a circular pipe are presented. The rheological constants for 0.67%, 0.8%, 1.5% and 3% aqueous solutions of Na-CMC are listed in this paper. Produced validation of numerical results with published data. . The numerical results are compared with available data in literature.
OPTIMIZАTION OF HEAT SUPPLY SYSTEM // Transactions of Academenergo. 2016. №3. p. 23-42.
A.Z. Daminov, I.N. Solomin
e-mail: daminov@list.ru, solil1@yandex.ru
FSBIS Kazan Scientific Center of the Russian Academy of Sciences
Keywords: heat supply system, optimization, method, mathematics model.
Annotation
The work have aimed for optimization of operating conditions and parameters of heat supply systems for improving their energy efficiency and reliability, quality and uninterrupted operation of production, transport and distribution of thermal energy. Have offered method for optimizing the heat supply systems and determining the optimal parameters (hot water flow in the heat supply network, diameters of sections of heat supply network, type of laying, type of insulation, etc.) from the heat source to the consumer in order to increase the energy efficiency of the systems. Have offered method for optimizing the temperature chart of load control in order to optimize energy consumption from heat sources in accordance with customer needs.
THE IMPROVED THERMAL INSULATION ON BASE OF THIN-FILM COVERING FOR HEATING SYSTEMS // Transactions of Academenergo. 2016. №3. p. 43-57.
I.A.Zakirova, N.D.Chichirova
e-mail: ilmira-07@mail.ru, ndchichirova@mail.ru
Kazan State Power Engineering University
Keywords: energy-saving, heating systems, heat loss, heat insulation, thin-film covering, thermography study
Abstract
The problems of energy saving in heating systems were considered. The analysis of thermal energy losses during transportation was carried out.The ways to achieve the energy efficiency by improving the quality of applied heat insulation and coating materials were showed. The classification of modern thermal insulation material was examined. Analysis of use of thin-film heat insulation covering as thermal insulation of pipelines was represented. It was showed that the thin-film rubber covering on the surface of the traditional thermal insulation construction of pipelines reduce heat loss by reducing the density of heat flows.The results of thermography of the pipeline surface with thin-film rubber covering were given.
Hydrodynamic structures of viscous flow in a coaxial channel with screw inserts // Transactions of Academenergo. 2016. № 3. p. 58-74.
A.I. Kadyirov, G.R. Khalitova, E.K. Vachagina
e-mail: aidarik@rambler.ru
FSBIS Kazan Scientific Center of the Russian Academy of Sciences
Keywords: screw insert, enhancement, helical coordinate system, velocity field
Abstract
The present work is devoted to the analysis and application of methods of mathematical modeling and calculation of one of the advanced methods – passive enhancement of heat transfer in laminar flow of Newtonian highly viscous liquid – using the long screw inserts. This method based on swirling flow technic, which creates a rotary motion of the fluid around the cross-section of the channel and its considered by Y.G. Nazmeevym as the most useful methods for highly viscous and nonlinear flows. Helical coordinate system obtained by Y.G. Nazmeev and other researchers are used to obtain the hydrodynamic equations in various forms. The numerical results of isothermal laminar Newtonian flows are illustrated as isolines of velocity fields in cross-section area.
THE development prospects of biogas technology in the agro-industrial complex // Transactions of Academenergo. 2016. №3. p. 75-86.
J.V. Karaeva, I.A. Varlamova, G.R. Khalitova
e-mail: julieenergy@list.ru
FSBIS Kazan Scientific Center of the Russian Academy of Sciences
Keywords: biogas technology, agro-industrial complex, development prospects.
Abstract
This paper presents the development of scientific ideas on the use of non-conventional renewable energy sources in the fuel and energy complex of Corresponding Member of RAS Nazmeev Y.G. The solution of the reliable power supply agro-industrial complex problem made possible to identify biomass from a number of alternative energy resources. The development prospects of biogas technology were analyzed by the example of the Republic of Tatarstan. The main reason holding back the introduction of biogas plants are high energy costs for the technological needs of equipment. Therefore the further development of this subject has been directed to the study of fluid flow and heat and mass transfer processes in the apparatus of biogas technology, as well as search for constructive and technological solutions aimed at improving energy efficiency.
ABOUT INITIAL CONDITIONS OF HYPERBOLIC BOUNDARY VALUE PROBLEM OF HEAT CONDUCTIVITY WITH CYCLIC BOUNDARY CONDITIONS // Transactions of Academenergo. 2016. №3. p. 87-99.
Yu.A. Kirsanov*, A.E. Yudakhin**, D.V. Makarushkin*
e-mail: kirsanov-yury@mail.ru, aejudakhin@gmail.com, atpp.danila@mail.ru
*FSBIS Kazan Scientific Center of the Russian Academy of Sciences
** FSBEI HE Kazan Power Engineering University
Keywords: boundary value problem, hyperbolic thermal conductivity, transient process, thermal relaxation, thermal damping, solution.
Abstract
The necessity of transition in theory of regenerative air preheater from heat conduction classical model of Fourier to dual phase lag model, taking into account thinner mechanisms of internal energy’s transfer in heat conduction phenomena, is shown. The simplest model of regenerator with one-section and its mathematical model in the form of a boundary value problem of the heat conduction in solid with cyclic boundary conditions are considered. Solutions of boundary value problems of two kinds are presented: parabolic and hyperbolic with boundary conditions of the third kind. The solutions of the hyperbolic boundary value problem with two different initial conditions are considered. It was shown that the setting of initial conditions in form of switching for temperature field and rates of their changing is unacceptable. When the conditions of switching for temperature fields are specifying, it is necessary to use as a second initial condition the heat balance between heat, which body’s surface got during period by heat emission from heat carrier, and heat, which body accumulated during the same time.
HEAT-AND-POWER ENGINEERING FUNDAMENTALS
MATHEMATICAL MODEL OF THE MULTISTAGE COMPRESSION OF THE WORKING BODY WITH THE FULL INTERMEDIATE COOLING // Transactions of Academenergo. -2016. -N 3. – P.P. 100-107.
D.L. Karelin*, A.V. Boldyrev**, V.M. Gureev***
e-mail: karelindl@mail.ru, alexeyboldyrev@mail.ru, Viktor.Gureev@kai.ru
*Kazan state energy university
**Naberezhnye Chelny institute (branch) of Kazan Federal University
***Kazan national research technical university of A.N.Tupoleva
Keywords: mathematical model, multistage compression, the full intermediate cooling, working substance, the compressor.
Abstract
In operation the mathematical model and its updating for account of expenses of energy on a multistage compression of a working body and its full intermediate cooling is offered. The net operation of squeezing and coefficient of magnification of mass are calculated, performances for freons R-133a, R-21 and R-10 are constructed at two -three-and four-stage squeezing. The analysis of performances has shown existence of boundaries of efficiency of application of cycles with various number of steps of squeezing of a working body with the full intermediate cooling depending on a degree of pinch of pressure.
COMPUTATION OF THE FLOW NEAR A SUCTION SLOT LOCATED ON THE WALL OF AN AIR DUCT // Transactions of Academenergo. -2016. -N 3. – P.P. 108-113.
D.V. Maklakov*, V.N. Posokhin**, E.V. Varsegova**
e-mail: dmitri.maklakov@kpfu.ru, posohin@kgasu.ru, evarsegova@yandex.ru
* Kazan Federal University,
** Kazan State University of Architecture and Engineering
Key words: velocity distribution, slot located on the wall, ideal fluid, analytical method, Fluent.
Abstract
The velocity field near a suction slot located on the wall of an air duct in a number of other outstanding series of slots has been computed. This leads to the presence of the transit air flowing past the slot. The solution is sought in the framework of the theory of potential flows of an ideal fluid method of conformal mappings A velocity distribution in the slot has been found analytically and compared with the results of numerical computations carried out by means of the Fluent package.
POWER GENERATION STATIONS
OPTIMIZATION OF THE MULTI-FUCTION EQUIPMENT RESERVE OWN NEEDS NPP OPERATION ON THE CCPP BASE // Transactions of Academenergo. -2016. -N 3. – P.P. 114-123.
A.I. Kozhevnikov, V.E. Jurin
e-mail: urin1990777@bk.ru
Saratov Scientific Center, Russian Academy of Sciences
Yuri Gagarin Saratov State Technical University
Keywords: nuclear power, nuclear safety, reservation of own needs, blackout, system failure, combined gas turbine unit, lifetime
Abstract
In case of emergency, followed by a complete blackout (including maximum design-basis accident), the combination of a nuclear power plant with a combined cycle plant allows for the necessary cooling down the reactor core power supply. In normal mode a combined cycle power plant generates an additional electricity. A probabilistic assessment of NPP safety while combination with CCPP was implemented. The calculations show that it can significantly increase the reliability of the auxiliary power supply station in accidents. The analysis of possible operation modes of CCPP was considered. The optimal operation modes of CCPP when decreasing loads were selected while taking into account the life reduction of the main thermal equipments.
ECONOMICS, ECOLOGY, INNOVATIVE TECHNOLOGIES AND PROCESSES IN POWER ENGINEERING
ASSESSMENT OF BOUNDARY CONDITIONS OF COOLING OF COMBUSTION CHAMBER IN THE HYDROGEN-OXYGEN STEAM GENERATOR USING CFD CODE // Transactions of Academenergo. 2016. №3. p. 124-132.
A.N. Egorov
e-mail: wwwean@gmail.com
Saratov Scientific Center of the Russian Academy of Sciences
Keywords: nuclear power, hydrogen power, hydrogen-oxygen steam generator, CFD code, water cooling, steam cooling, temperature regime, life time.
Abstract
The use of hydrogen-oxygen steam generator allows to increase the power and maneuverability of the NPP. The combustion of hydrogen is formed the high-temperature steam which can be used to superheat the working fluid of main steam turbine during peak hours of power consumption. At night, the production of hydrogen and oxygen is carried out by electrolysis of water. The combination of high temperatures and cyclic mode of operation has a significant impact on the life time of hydrogen-oxygen steam generator.
The analysis of temperature regime of combustion chamber walls for the water and steam cooling was performed. The average temperature of the walls of the combustion chamber, made of bronze alloy BrCa1, is determined using CFD code. It is shown that the water and steam cooling allows to keep the metal temperature within acceptable limits by the given design of cooling.
The estimation of resource of combustion chamber in terms of reduction of strength properties of metal at different temperatures was performed. It is shown that the use of steam for cooling of the combustion chamber is unacceptable from the viewpoint of life time with the given design of cooling.
MEASUREMENT DURATION PULSE OF THE OPTICAL DISCHARGE IN AIR AND ON CHO-MODEL FOR EVALUATION OF POWER PARAMETERS AND OPERATING MODES OF THE PULSED LASER // Transactions of Academenergo. 2016. №3. P. 133-140.
A.G. Sattarov 1, A.V. Sochnev 1. 2
e-mail: albert5519@mail.ru, sochnev.aleksandr@inbox.ru
1Kazan State Technical University named after A.N. Tupolev
2Kazan State Technological University
Keywords: rocket engine, laser rocket engine, laser jet, laser propulsion, optical discharge, optical breakdown, laser, laser systems, aircraft.
Abstract
In this paper experimentally determined period of laser pulses for an optical discharge in normal conditions and for the optical discharge initiation of chemical reactions, or explosives that are 40mks and 200mks respectively. It provides an assessment of energy and pulse repetition rate lasers required for launching an aircraft launch weight from 10 to 100kg.