A.I. Kadyirov*, E.K. Vachagina*, E.M. Khusnutdinova**
PARAMETRIC METHOD FOR SOLVING THE PROBLEM ON NON-ISOTHERMAL flow IN PIPE using MULTI-MODE Giesekus model // Transactions of Academenergo. -2018. –N 4.-P.P. 7-16.
e-mail: aidarik@rambler.ru, vachaginae@mail.ru, rr-088@mail.ru
*Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences
**Kazan Federal University
Keywords: viscoelastic fluid, Giesekus model, Fourier method, Sturm-Liouville problem, parametric method, multi-mode fluid
Abstract
A parametric method is developed for solving the problem of non-isothermal flow in a pipe using multi-mode Giesekus fluid. The first kind of thermal boundary condition is considered. The solution of the problem includes a parametric representation of the dependences of the gradient of shear rate, the axial component of the velocity vector, tangential and normal stresses, temperature fields on a geometric variable. The implementation of the developed method is shown on the example of a non-isothermal flow of an aqueous solution of Sterocoll FD with 0.5 fractions of Sterocoll D in a round pipe. The contribution of the first and second modes to the stress tensor is estimated. The analysis of the distribution of local and normalized temperatures along the length of the pipe is discussed.
T.M. Farakhov, E.P. Afanasiev, A.G. Laptev
THE THERMAL EFFICIENCY OF THE CHANNELS WITH INTENSIFIERS FOR HYDROCARBON MIXTURES // Transactions of Academenergo. -2018. –N 4.-P.P. 17-27.
e-mail: tvt_kgeu@mail.ru
Engineering-Promotional Center “Inzhekhim”, «Kazan State Power Engineering University», «Surgut Condensate Stabilization Plant»
Keywords: intensified heat transfer, chaotic nozzles, flow structure, mixing the medium, liquid hydrocarbon
Abstract
Methods for increasing efficiency at heating or cooling viscous hydrocarbon mixtures in channels that provide a transition from a laminar to a turbulent regime are considered. For calculating the design and operating characteristics of channels with intensifiers, a mathematical model is presented, which is based on models of the flow structure and the thermal numbers of transfer units. An expression is obtained for calculating the required heat transfer surface area for a given thermal efficiency of the process. Comparative characteristics of channels with various methods of intensification of heat transfer for viscous hydrocarbon mixtures are given.
A.V. Kovalenko, S. L. Malyshev
ANALYSIS OF THE RESULTS OF USING THE MEASURING SYSTEM WITH A REVERSIBLE PROBE TO DETERMINE THE FLOW RATE OF WET STEAM // Transactions of Academenergo. -2018. –N 4.-P.P. 28-40.
e-mail: aleks_dr11@rambler.ru, pamir.61@mail.ru
FGUP «VNIIR», JSC”RosNIPItermneft“
Key words: wet steam, the degree of dryness, flow rate, phase.
Abstract
The results of tests of prototypes of measurement system flow wet steam developed by the Elektrogorsk research center (EREC), held at the stands EREC and in operation at Balakovo NPP. The rationale that is known to the measuring system detects only an intermediate flow parameters: the speed and density of the vapor phase of the controlled flow. To determine the mass flow of wet steam in the steam lines of steam generators of power reactors it is proposed to expand the informational basis of the measuring system the current setting of the degree of dryness.
D.I. Pashchenko, R.M. Mustafin
CFD-MODELING OF THE FLUID DYNAMICS IN THE POROUS CATALYST BED OF THE THERMOCHEMICAL REGENERATOR // Transactions of Academenergo. -2018. –N 4.-P.P. 41-51.
e-mail: pte@samgtu.ru
Samara State Technical University
Keywords: aerodynamic resistance, computational fluid dynamics, catalyst, methane conversion, thermochemical regeneration of heat.
Abstract
One of the tasks in the engineering calculations of thermochemical heat recovery systems is to determine the aerodynamic resistance of the catalyst bed in a thermochemical regenerator. Using the principles of CFD modeling, a computer model for the fluid dynamics in a fixed catalyst bed has been developed. The numerical experiment was performed via the software product ANSYS Fluent. Pressure losses in the catalyst bed for different inlet flow rates have been determined. The numerical results are verified with experimental data. For the results, a characteristic quadratic dependence of the pressure loss on the velocity Δp = f (w2) is observed. Based on the CFD simulation data, it is established that the local loss coefficient (ξ) of the catalyst bed depends on the velocity of the gas stream passing through the bed. As the flow rate decreases, the value of the local loss coefficient increases. Therefore, if the coefficient ξ = 140 for a velocity of 1 m/s, then the coefficient ξ = 168 for a velocity of 0.2 m/s. The developed model allows performing computational experiments for catalytic layers filled with granules of various shapes and porosity. The obtained results can be used in engineering calculations of the method for increasing the energy efficiency of heat and heat power plants, which is based on the thermochemical transformation of the thermal energy of flue gases into the chemical energy of the new synthetic fuel, as well as in the calculations of chemical reactors for methane vapor conversion. In addition, the results obtained can be used to calculate methane conversion furnaces using porous nickel oxide catalysts.
А.N. Bairamov*, D.Yu. Serov**
EVALUATION OF THE EFFICIENCY OF HYDROGEN FACILITY WITH AN ADDITIONAL STEAM TURBINE IN COMBINING WITH NPP // Transactions of Academenergo. -2018. –N 4.-P.P. 52-61.
e-mail: oepran@inbox.ru, serov.saratov.russia@yandex.ru
*Federal State Budget Institution of Science Saratov Scientific Center of RAS
**FSBEI of Higher Education “Saratov State Technical University named Gagarin Yu.A.”
Keywords: atomic power station, hydrogen facility, steam-hydrogen overheat, additional steam turbine, cost of peak electricity
Abstract
The goal of the article is to evaluation of the competitive efficiency of nuclear power plants in combination with a hydrogen facility in comparison with gas turbines under conditions of covering peak electrical loads in the power system. A scheme of the combination nuclear power plant with a hydrogen facility is given for example of the PWR-1000 reactor with a turbine K-1000-60/1500. The actuality of the use of a constantly operating additional steam turbine as part of a hydrogen facility operating on a steam which extruded from main cycle by hydrogen. Herewith an additional turbine is used in period peak hours of electrical loads while maintaining the regime of a hot rotating reserve at night. The cost of peak electricity is comparison criterion. The prices for gas and nuclear fuel is forecast up to 2035 year and take into account. The methodology of estimation efficiency of combining of the atomic power plant with a hydrogen facility is given with use of additional steam turbine. As a result, it is shown that the use of gas turbines is associated with the unloading of nuclear power plants and this leads to a significant increase in costs of gas turbines, which is not effective.
I.A.Zakirova, N.D.Chichirova, S.M. Margulis
DEVELOPMENT OF CALCULATION METHODS AND RESULTS OF EXPERIMENTAL RESEARCHES TO IMPROVE EFFICIENCY AND RESOURCE OF HEAT INSULATION OF PIPELINES AND HEAT EQUIPMENT ENERGY SYSTEMS // Transactions of Academenergo. -2018. –N 4.-P.P. 62-73.
e-mail: ilmira-07@mail.ru, ndchichirova@mail.ru
Kazan State Power Engineering University
Keywords: heat supply systems, heat networks, heat losses, heat insulation, thin-film coatings, energy saving
Abstract
The issues of energy saving in heating supply systems are considered. Composite thermal insulation consists of mineral wool and thin cover of fiberglass that tends to have been deforming and destroying during its exploitation time. This leads to a heat loss through the composite thermal insulation while thermal energy transferring. This paper considers the use of thin-film coating (TFC) in the design of the existing typical thermal insulation of pipe heating systems to increase its efficiency and reduce thermal energy losses. The results of experimental studies of effectiveness of TFC use on the surface of the existing typical thermal insulation of pipelines of heating network with the aim of reducing heat loss are presented. The results of a numerical study of thermal processes in the layer of thermal insulation are also presented. Due to the fact that the considered type of thermal insulation is air permeable, and the value of permeability depends on the state of the filler and coating layers, the results of a numerical study of the effect of convection on heat transfer in a porous permeable insulation of pipelines of heating networks are presented. To analyze the influence of TFC on thermal process parameters, indoor and outdoor heating networks were considered. A practical example of the use of TFC in the design of the existing thermal insulation of heating supply system in Osinovsky in the Zelenodolsk District of the Republic of Tatarstan is shown.
A.V. Tumanov
DAMAGE NUCLEATION AND CREEP CRACK GROWTH PREDICTION IN THE COMPRESSOR DISK // Transactions of Academenergo. -2018. –N 4.-P.P. 74-88.
e-mail: tymanoff@rambler.ru
Kazan Scientific Centre of the Russian Academy of Sciences
Keywords: damage nucleation, creep stress intensity factor, creep crack growth, lifetime prediction
Annotation
In this study total durability of the compressor disk is calculated. Total durability contains two stages. First is the damage nucleation time and second is the creep crack growth. Damage accumulation rate law was implemented in ANSYS. On the basis of numerical calculations, the place and time of initialization of the defect was determined. On the basis of both strain energy density and creep stress intensity factor the creep crack growth prediction method was proposed. At the final stage of the analysis, the total durability was determined. Total durability take into account both the time of the nucleation and the time of crack growth. It is shown that the time of crack initialization makes a greater contribution to the overall durability compared to crack growth time.
R.R. Yarullin, I.S. Ishtyriakov
DEVELOPMENT AND NUMERICAL VERIFICATION OF THE AIRCRAFT GTE COMPRESSOR’S DISK IMITATION MODEL // Transactions of Academenergo. -2018. –N 4.-P.P. 89-99.
e-mail: yarullin_r@mail.ru, ivan_200999@mail.ru
Institute of Power Engineering and Advanced Technologies FRC Kazan Scientific Center, Russian Academy of Sciences
Key words: gas turbine engine, compressor disk, titanium alloy, imitation model, stress-strain state
Abstract
The paper is concerned with numerical verification of imitation model of GTE compressor disk. The comparisons of stress-strain state at critical zones of compressor disk and imitation model are presented. Experimental fixtures are designed to reproduce operation loading conditions in compressor disk during the tests on a servo-hydraulic test system. It is demonstrated that proposed imitation modeling principles allows estimating residual life of compressor disk with take into account crack initiation and growth at critical zones.
A.P. Zakharov*, A.A. Tartygasheva**
The nonlinear fracture resistance parameters in various types of specimens under mixed mode loading // Transactions of Academenergo. -2018. –N 4.-P.P. 100-114.
e-mail: alex.zakharov88@mail.ru, tartigashevaa@mail.ru
*Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences
**Kazan State University of Architecture and Engineering
Keywords: mixed mode loading, plastic stress intensity factor, J-integral, stress triaxiality.
Abstract
The present study is concerned with a numerical analysis of a complex of nonlinear fracture resistance parameters in the full range of mixed mode loading for various types of experimental specimens. Two types of cruciform specimens and compact-tension specimen are considered for various combinations of the crack angle and loading biaxiality with variation of the elastic-plastic properties of the material. Nonlinear fracture resistance parameters in the form of stress triaxiality, a J-integral, and a plastic stress intensity factor are calculated. The influence of the geometric parameters of the specimens, the plastic properties of the material, and the mixed mode loading on the behavior of the investigated parameters is established.
A.V. Tumanov, V.N. Shlyannikov
METHOD FOR CREEP DAMAGE ACCUMULATION LAW CONSTANTS DETERMINATION // Transactions of Academenergo. -2018. –N 4.-P.P. 115-126.
e-mail: tymanoff@rambler.ru, shlyannikov@mail.ru
Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences
Keywords: damage accumulation, creep crack growth, lifetime prediction, fracture process zone
Abstract
In this study a computational-experimental method for the creep damage accumulation law constants determination is present. Proposed method makes possible to obtain constants of damage accumulation power-law from standard creep tests under uniaxial tension. The relationship between time to rupture and ultimate strength is obtained. This relationship makes possible to predict creep crack growth rate in materials and structures. In order to numerical calculations damage law was integrated into ANSYS Mechanical. Proposed method allows to predict durability of structural elements at high temperature loading and it has no arbitrariness in the definition of input parameters.