ORIGIN OF THERMAL INSTABILITY IN THE CONDITIONS OF UNSTATIONARY HEAT EXCHANGE AT LAMINAR FLOW OF PSEUDOPLASTIC LIQUID IN ROUND PIPE Ananev D.V.e-mail: Dima211083@yandex.ru Research center fоr Power Engineering Problems Kazan Scientific Center Russian Academy of Sciences Keywords: Critical modes, unstationary, heat exchange, laminar flow, pseudoplastic liquid, structural-viscid incompressible liquid. Abstract: The explored critical modes of unstationary heat exchange are investigated at the laminar flow of pseudoplastic liquid in the round pipe. Influencing of linear and periodic change of the number characterizing correlation between external and by inlying heat transfer on the origin of thermal instability in thread of liquid is considered. The heat exchange is considered at motion of pseudoplastic liquid in the enough long channel, the influence of hydrodynamic and thermal initial area can be ignored. As reological model the Kutateladze-Habahpasheva model for the structural-viscid incompressible liquid was used. |
INFLUENCE OF THE LINEAR LAW OF CHANGE OF NUMBER BIO ON STATIONARY HEAT-AND-MASS TRANSFER IN MONOPHASE LINE POLYMERIZER REACTOR A.I.Kadyyrove-mail: aidarik@rambler.ru Research center fоr Power Engineering Problems Kazan Scientific Center Russian Academy of Sciences Keywords: heat-and-mass transfer, monophase line polymerizer reactor, rheokinetic, number Bio, thermal explosion Abstract «The round pipe» for thermal third sort boundary conditions is considered stationary heat-mass exchange in monophase polymerizer reactor of type. Dependences on temperature, hydrodynamical, rheological and rheokinetics characteristics of environment for various factors of speeds of change of number Bio are constructed. The precritical surfaces separating low-temperature modes from high-temperature, for operating parameters are constructed. During numerical researches heat-and-mass transfer in monophase polymerizer reactor was received, that, by increasing speed of a heat-conducting path on length of a pipe, it is possible to prevent of the phenomenon of thermal explosion that will lead to preservation of structure and quality of the formed polymer. |
DEVICE FOR VELOCITY AND TEMPERATURE MEASUREMENTS IN A FLUID MEDIUM USING A SENSOR WITH A SINGLE TEMPERATURE WIRE N.I.Mikheev*, V.M.Molochnikov*, D.V.Kratirov**, K.R.Khairnasov*e-mail: n.miheev@mail.ru, vmolochnikov@mail.ru * Research Center of Power Engineering Problems,Kazan Scientific Center of RAS ** A.N.Tupolev Kazan State Technical University Key words: hot wire anemometer, device, velocity, temperature, sensing element. Abstract Theoretical foundations for temperature and velocity measurements in a fluid medium using a single wire of sensing element of a hot wire channel are given. The device is described which operates using the given technique for flow velocity and temperature measurements. |
INDUSTRIAL HEAT-AND-POWER ENGINEERING |
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ESTIMATION OF ENERGY EFFECTIVENESS OF MAIN HEAT-EXCHANGE EQUIPMENT OF GAS SEPARATION SCHEME IN ETHYLENE PRODUCTION S.I. Ivanova, E.V. Shamsutdinove-mail: workscience@yandex.ru, eshamsutd.kazan@mail.ru Research center of problem of power energy of Kazan scientific center Russian Academy of Sciences, 420111, Lobachevski St., 2/31, Kazan, Russia, Keywords: heat, exergy, low-potential heat. Abstract: Offered the division of equipment of thermo-technological gas separation scheme is offered in ethylene production on main and subsidiary. Energy effectiveness of main heat-exchange equipment based on thermal and thermodynamic analysis is estimated. Values entry/ leaving heat and exergy, values of thermal and exergic efficiency of main heat-exchange equipment and all thermo-technological gas separation scheme are found. In the issue estimation streams low-potential heat are found which may be used to make energotechnological combined system for increasing of thermal and thermodynamic effectiveness under consideration thermo-technological scheme. |
METHODS OF MATHEMATICAL MODELLING AND OPTIMIZATION OF SYSTEMS OF HEAT SUPPLY OF SETTLEMENTS R.Ì. Nigmatullin, A.Z. Daminove-mail: daminov@list.ru Research centre of energy problems of Kazan scientific centre of Russian Academy Sciences Keywords: system of heat supply, modeling, optimization, target function, criterion, area of optimum values. Abstract: The review of theoretical works in area of mathematical modeling of working processes and optimization of the systems of heat supply and their making elements are presented. The distinctive features of task of optimization of the systems of heat supply are presented and considered principles of technological and economic computations. As a criterion of optimization the minimum of the resulted expenditures or minimum of the specific resulted expenditures are used. The classification of basic directions is given in area of automation of modeling of processes in the stationary mode of operations. The task of optimum development and reconstruction of the systems of heat supply is presented in detail, its mathematical raising, decomposition on the separate tasks and complex method of decision are resulted. |
POWER GENERATION STATIONS |
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THERMOCHEMICAL PROCESSING OF COAL IN PROCESSES OF ITS PREPARATION FOR BURNING ON THERMAL ELECTRIC POWER STATION M.V.Pyatygina, G.R.Mingaleevae-mail: pmv_83@mail.ru , mingaleeva-gr@mail.ru Research Center for Power Engineering Problems of the Russian Academy of Sciences Key words: molecular structure of coals, chemical bonds Abstract The research of thermo chemical processing of coal is based on detailed structure studying and also molecular structure of coals of various types. The analysis of stages of pyrolysis of coal for revealing of sequence of formation of end-products – coke, pitches and pyrolysis gas which can be burnt in boilers of thermal electric power stations as a substitute of natural gas is carried out. The mode choice of carrying out the process depends on molecular structure of coal. Nowadays the separate structural components of molecule of coal are defined by X-ray methods, the electronic analysis, the nuclear magnetic resonance, etc. On the basis of these data can be assumed the way process of relcase and established some qualitative, and in a consequence quantitative parities. |
MODELING OF BIPHASE TURBULENT CURRENTS IN SMOOTH PIPES A.A.Fedosove-mail: fedosov-kazan@mail.ru Research Center of Power Engineering Problems of Kazan Science Center the Russian Academy of Sciences Keywords: Modeling, smooth round pipes, losses of pressure, diphase turbulent streams Abstract The construction the mathematical model is presented, allowing to calculate a structure of stream speed and to estimate losses of pressure in smooth round pipes for the diphase turbulent streams arising at introduction in a stream a small amount of fine particles. The distribution of speed on radius a pipe in such currents can be described by means a logarithmic structure of speed. In an analytical kind the resistance law for the diphase currents is received. By the at aspiration of concentration particles to zero in a known parity for a single-phase case. The offered mathematical model can be widespread to a case of rough pipes. It is represented, that the used approach can be applied for the reduction description of resistance at entering into a turbulent stream of polymeric additives. |
RESEARCH OF HYDRODYNAMICAL CHARACTERISTICS OF A LAMINAR STREAM AT TO RUN THE SINGLE FLOODED JET OF BLACK OIL ABOUT A WALL OF THE TANK E.V. Shamsutdinove-mail: eshamsutd.kazan@mail.ru Research Center of Power Engineering Problems of Kazan Science Center the Russian Academy of Sciences Keywords: Heat power system, heat and mass exchange processes, modeling, hydrodynamics, jet currents, viscous liquids Abstract: The mathematical model of hydrodynamics of the flow of the single flooded jet of the black oil following from a horizontal located nozzle is considered, by its run on a vertical wall of the tank. Structures of distribution of lines of a current, the module and component of a vector of speed, components of a vector of a whirlwind in horizontal and vertical sections of area of current for various distances both from a vertical wall, and from an axis of a stream are presented. The analysis of results has showed, that in the field of close located to nozzles there is a returnable current. In process of increase in distance from a nozzle up to a barrier, the zone of occurrence of returnable current is displaced in a direction of the fluid flow to the barrier. Owning the fact that the direction of the basic flow of a jet is perpendicular in relation to a vertical wall, the greatest contribution to hydrodynamics of a stream brings horizontal a component of a vector of speed. |
POWER AND MECHANICAL ENGINEERING |
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WAYS OF THE DECISION OF PROBLEMS THERMOPLASTIC. THE REPORT 1 (REVIEW) A.V.Tumanove-mail: tymanoff@rambler.ru Research Center of Power Engineering Problems of Kazan Science Center the Russian Academy of Sciences Keywords: a method of final elements, elasticity, plasticity, thermoplasticity, criteria of fluidity, the deformation theory of plasticity Abstract In given article the basic ways of the decision of problems of elasticity, plasticity, thermoplasticity are considered. The simplified algorithms of their decision are presented. Principal views of criteria of fluidity of a material and ways of definition of constants of integration of the differential equations describing behaviour of a material in plasticity and thermoplasticity zones are considered. Algorithms of the decision are presented for the most comprehensible and often used in a kind of the universality of a method of the decision of these problems – a method of final elements. Special cases of plastic currents of a material and a method of construction of a curve of equivalent pressure as functions from equivalent plastic deformations for definition of parametre H are considered. |
WAYS OF THE DECISION OF PROBLEMS THERMOPLASTIC. THE REPORT 2 (REVIEW) A.V.Tumanove-mail: tymanoff@rambler.ru Research Center of Power Engineering Problems of Kazan Science Center the Russian Academy of Sciences Keywords: a method of final elements, thermoplasticity, algorithms of the decision of nonlinear problems of mechanics Abstract The given message is article continuation «Ways of the decision of problems thermoplastic. The message 1». In which the description of problems of the theory of elasticity and plasticity and as possibility of the account of influence of temperature is considered at material transition in a plastic condition has been given. In this article problems of viscosity (creep), thermoviscosity (thermocreep) and, as uniting in themselves of a thermoplasticity and thermocreep problem are considered. Methods of construction of is final-element algorithms of the decision of problems and most often used algorithms of calculation bodies are presented. |
ECONOMICS, ECOLOGY, INNOVATIVE TECHNOLOGIES AND PROCESSES IN POWER ENGINEERING |
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CHOICE OF BIOENERGY PLANTS FOR ENERGY SUPPLY OF ENTERPRISE OF AGROINDUSTRIAL COMPLEX Y.V. Karaeva e-mail: julieenergy@list.ru Research centre of energy problems of Kazan scientific centre of Russian Academy Sciences, Keywords: bioenergetics, agro industrial complex, energy supply, modeling, biomass, biogas, informative network, equipment. Abstract The article is devoted to the substantiation ground of choice of bioenergy plants for the energy supply of enterprise of agro industrial complex. The classification of bioenergy plants on the structural features of organization of technological process of production of biogas, method of organization of process, basis of origin of wastes, humidity of substratum and energy power of installation are presented. The possibility of the extended use of energy of biomass in region is investigated by the hybrid mathematical model, which basic elements there are the informative-power circuit of fuel and energy balance of agro industrial complex and data-base bioenergy equipment. As a result of the numeral research based on the developed mathematical model, the optimum set of bioenergy equipment, necessary for making of electric and thermal energy from wastes of stock-raising, is definited. |
RESONANT CHARACTERISTICS OF PUNCHED CASING STRING OF A WELL E.A.Marfin, JA.I.Kravtsove-mail: marfin@mail.knc.ru Research centre of power engineering problems of the Kazan Science Centre of the Russian Academy of Sciences Keywords: casing string, well, punching, electro-acoustic analogy, a resonance, the acoustic resonator. Abstract On the basis of a method of electro-acoustic analogies frequency characteristics of the punched site casing string of a well are theoretically investigated. It is marked, that the chink behaves as the acoustic resonator. It allows to provide the amplitude increase of raised fluctuations at the frequencies close to frequency of its own fluctuations, and also promotes absorption of energy of fluctuations on other frequencies. The interrelation of resonant characteristics punched casing string of a well with its geometrical is definited. The system of the equations, allowing describing this interrelation is offered. The received results can be used by definition of an optimum mode of the integrated influence on productive layers. |
RESEARCH OF TURBULENT CURRENT OF A COMPRESSED LIQUID ON A PATH OF THE DEVICE WITH RESONANT CHAMBERS L.I.Samburova |