HEAT AND POWER ENGINEERING FUNDAMENTALS
THERMAL PROCESSES IN THE STUFFING OF REGENERATIVE AIR PREHEATER WITH CONSIDERATION OF THERMAL RELAXATION AND THERMIC DAMPING // Transactions of Academenergo. -2017. –N 1.-P.P. 7-15.
Yu.A.Kirsaniov*, A.E.Yudakhin**, A.Yu.Kirsanov***
e-mail: kirsanov-yury@mail.ru, aejudakhin@gmail.com, atpp.danila@mail.ru, akirsanov@list.ru
* FSBIS Kazan Scientific Center of Russian Academy of Sciences
** FSSEI HE Kazan State Power Engineering University
*** FSSEI HPE Kazan National Research Technical University named after A.N. Tupolev
Keywords: regenerative air preheater, Fourier model, Maxwell-Cattaneo-Lykov model, hyperbolic differential equation of heat conduction, cyclic boundary conditions.
Abstract
In the article the mathematical model of single-section regenerative air preheater with the stuffing in the form of cylindrical rods, blown by transverse cold and hot flows of heat carriers, is considered. The model is a solution of heat conduction problem with cyclic boundary conditions of the third kind with a hyperbolic differential equation, which takes into account the phenomenon of thermal relaxation and thermic damping in the stuffing. Performed mathematical experiment on specific example has shown the need to taking into account the effect of the thermal relaxation and thermic damping on the heat transfer ability of regenerative air preheater.
THE NUMERICAL RESEARCH OF THE PULSATED SEPARATED TURBULENT FLOW STRUCTURE IN CHANNEL BEHIND DIAPHRAGM // Transactions of Academenergo. -2017. –N 1.-P.P. 16-29.
S.V. Boldyrev*, A.V. Boldyrev*, S.I. Kharchuk**
e-mail: underminder@mail.ru, alexeyboldyrev@mail.ru, kharchyk@mail.ru
*Naberezhnye Chelny institute (branch) of Kazan Federal University
**FSBEI HE «Kazan power-engineering university»
Keywords: pulsated flow, separated flow, turbulent flow, numerical simulation, turbulence model, flow structure, vortex.
Abstract
Based on Lagrange approach the visualization method of flow structure was chosen. The verifying calculations of the pulsated separated turbulent flow in square-cross-section channel with rib on a wall were carried out. The numerical simulation of the pulsated separated turbulent flow in cylindrical channel behind diaphragm was carried out. Devised by authors the modification variant of quadratic High-Reynolds number k-e turbulence model was applied. The flow features such as a form and size of vortexes, possible formation on low frequency and resonance regimes, merging with a main vortex and further decay of the additional small-scale vortex in a mixing layer, and the like, were detected. Probable reasons of their emergence were researched.
Two-phase Flow metering by ultrasonic flow meters // Transactions of Academenergo. -2017. –N 1.-P.P. 30-41.
E.M. Gershman*, S.D. Pruglo**, V.A. Fafurin***, A.A. Borisov****, A.N. Sabirzyanov*****
e-mail: GershmanEM@sibur.ru, Pruglo.DS@tmn.gazprom-neft.ru, fafurin.viktor@yandex.ru, borisov@ooostp.ru, ANSabirzyanov@kai.ru
* “Metrology” Center of “SIBUR” Ltd.
** “Gasprom Oil New Port” Ltd.
***Federal State Unitary Enterprise “All-Russian Research Institute of Flow Metering”
**** STP Center of Metrology Ltd.
***** Kazan National Research Technical University named after A.N. Tupolev – KAI
Keywords: Ultrasonic flow meter, fluid flow rate standard, two-phase medium, water, air, volumetric gas content, air bubble size, complementary error.
Abstract
The effect of air bubbles in water flow on the flow metering results obtained by a pulse-time single-ray ultrasonic flow meter has been studied experimentally. A flow rate calibration standard was used for investigations. The behavior of complementary error of the ultrasonic flow meter has been established depending on the volumetric gas content in the water flow and bubble size.
FLUID DINAMICS AND HEAT TRANSFER IN A CURVED CHANNEL WITH IMPOSED UNSTEADINESS OF THE FLOW // Transactions of Academenergo. -2017. –N 1.-P.P. 42-49.
A.A. Tsynaeva, M.N. Nikitin
e-mail: a.tsinaeva@rambler.ru, nikitin.pro@gmail.com
Samara State Technical University
Keywords: pulsating turbulent pipe flow, amplitude, heat transfer, hydrodynamics, intensification, numerical study
Abstract
This work investigates the possibilities of increasing the heat transfer coefficient due to the superimposed pulsations of flow. In this research are realized study of flow and heat transfer in a curved channel with square cross section in the presence and absence of nonstationarity of the flow. Studies were performed by means of numerical modeling using software complexes Salome and Code Saturne. Mathematical modeling is based on equations of conservation of mass (continuity equation), the equation of momentum conservation (Navier-Stokes) equations of conservation of energy. The verification of the used models, methods and software tools. The data presented numerical studies on temperature and flow rate in the presence of nonstationarity and changing the direction of flow. The result of the research revealed that the presence of low-frequency ripple (10 Hz) significantly increases the heat transfer coefficient: at a frequency of 5 Hz, the heat transfer coefficient increased up to 1,018 times under acceleration, and at 10 Hz up to 1.21 times. The presence of a pulsation leads to a distortion of the temperature profile and the flow velocity in a curved channel.
INDUSTRIAL HEAT-POWER ENGINEERING
FLOW OF GASES INTO THE INDUSTRIAL SMOKE PIPE // Transactions of Academenergo. -2017. –N 1.-P.P. 50-59.
Yu.G. Volodin, O.Р. Marfina, М.S. Tsvetkovich, А.Р. Kirpichnikov
e-mail: yu.g.volodin@mail.ru, o_marfina@ mail.ru, сvetkovich@prcpk.ru, kirpichnikov@kstu.ru
Kazan State University of Architecture and Engeneering
Keywords: the mathematical modeling, the gas stream, the smoke gases, the smoke pipe.
Abstract:
For a description of the flow of the smoke gases in the working space of the industrial smoke pipe discharging barrel proposed three-dimensional mathematical model based on Favre averaged Navier-Stokes equations, closed k-ε – turbulence model with enhanced wall functions. This made it possible to make a detailed physical picture of the process under study, establish the existence of a large part of the internal volume of the trunk of intensive secondary flows, vortex areas that have a significant impact on the kinematic structure of the entire stream, on the velocity distribution in nature in its various cross-sections, as well as friction, heat and mass transfer in the wall region. The calculations showed that the root of the smoke pipe forming a swirling gas flow, which reduces the corrosion resistance of its walls. This undesirable phenomenon is markedly diminished when installing the inlet diverter stem special ramps or partitions.
TECHNOLOGY TO PREVENT AND ELIMINATE THE CONSEQUENCES OF BACTERIOLOGICAL CONTAMINATION OF THE HEATING SYSTEM // Transactions of Academenergo. -2017. –N 1.-P.P. 60-70.
V.I. Sharapov, M.M. Zamaleev, E.A. Astafieva, N.Y. Kolbasova
e-mail: vlad-sharapov2008@yandex.ru
Ulyanovsk State Technical University
Keywords: heating networks, heat supply, heating, microbiological corrosion, bacterial contamination, microorganisms.
Abstract
We consider technology to combat bacteriological pollution that arise in heating systems as a result of vital activity of sulfate-reducing bacteria and iron bacteria.The main cause of these bacteria in the water network are the biological contamination of raw water to fuel the heating system, which is determined by the permanganate oxidation of water, and also low rate of coolant flow, which creates favorable conditions for the growth of bacterial colonies in the heating system elements.We have proposed a set of measures for the prevention and elimination of consequences of bacteriological contamination of the heating system.
POWER GENERATION STATIONS
SYSTEM ANALYSIS OF STRESS-CYCLIC REGIME OF WORK OF PRINCIPAL EQUIPMENT OF ENERGY COMPLEX WITH HYDROGEN FUEL IN COMBAIN WITH ATOMIC POWER STATION // Transactions of Academenergo. -2017. –N 1.-P.P. 71-96.
A.N. Bairamov
e-mail: oepran@inbox.ru
Federal State Budget Institution of Science Saratov Scientific Center of RAS
Keywords: energy complex with hydrogen fuel, speed of growth fatigue crack, quantity of cycles till fracture, close of crack, coefficient of intensity range of tension, corrosion produced by hydrogen.
Abstract
Regime was analysed of cyclic work start-stop of principal equipment energy complex with hydrogen fuel in combain with atomic power station on basis of theory fatigue fracture. Evaluation was maked of speed of growth fatigue crack with dependence from frequency of start-stop for electrolysis plants, compressors, metal tanks of storage hydrogen and oxygen, chamber of combustion of hydrogen with oxygen. Influence was take into account of corrosion produced by hydrogen on speed of growth fatigue crack. Complex criterion was offered of evaluation of quantity cycles till fracture without and with influence of corrosion produced by hydrogen.
POWER AND MECHANICAL ENGINEERING
THE ANALYSIS OF PROPERTIES OF THE STEEL ALLOYS USED FOR PIPES OF THE DISTRICT HEATING TRANSMISSION SYSTEM // Transactions of Academenergo. -2017. –N 1.-P.P. 97-103.
S.V. Chicherin
e-mail: man_csv@hotmail.com
Omsk State Transport University (OSTU)
Keywords: district heating, reliability, heat distribution system, pipeline, pipe, failure, corrosion, material, steel, alloy mechanical characteristics, properties.
Abstract
The article presents the results of laboratory and industrial studies of the corrosion resistance of the steel used for making heat transmission piping. The paper deals with the research in processing and mechanical properties of various alloys. A comparative analysis of the steel used is provided. Author has designed the programme of experiment that could carry out the steps of future reliability improvement. To control the results the corrosion velocity on the loss in weight of the samples which were made of the same alloys should be measured (gravimetric method). The results will show high convergence.
PARAMETERS OF CRACKED BODIES BEHAVIOR UNDER CREEP CONDITIONS // Transactions of Academenergo. -2017. –N 1.-P.P. 104-118.
N.V.Boychenko
e-mail: nataboi@yandex.ru
Kazan Scientific Centre of the Russian Academy of Sciences
Keywords: С-integral, creep, creep stress intensity factor, In-integral
Abstract
In this study, the main parameters characterizing the crack growth under creep conditions are presented. Small-scale, transition and extensive creep conditions for primary and secondary stages are considered. In the review, the parameters and methods for their determination are given for the model problem of infinite size cracked body, as well as for test specimens.
CREEP DAMAGE FIELDS NEAR THE CRACK TIP UNDER BIAXIAL LOADING // Transactions of Academenergo. -2017. –N 1.-P.P. 119-130.
A.V. Tumanov
e-mail: tymanoff@rambler.ru
Kazan Scientific Centre of the Russian Academy of Sciences
Keywords: creep stress intensity factor, damage field, damage accumulation.
Abstract
Numerical calculation of infinite cracked plate is presented for creep condition with damage accumulation. Distribution of a damage fields near the crack tip are presented for different combination of creep time, load biaxial ratio and government parameter of damage accumulation function. Three types of biaxial ratio is considered. It is established that accounting for creep damage gives a more conservative estimate of the strength of the material. Distributions of a government parameter of stress-strain fields in form of In-integral is obtained with taking in to account damage accumulation during creep. The sensitivity of the creep stress intensity factor to the parameters of the damage accumulation function parameters is demonstrated.
ECONOMICS, ECOLOGY, INNOVATIVE TECHNOLOGIES AND PROCESSES IN POWER ENGINEERING
THE STUDY OF ULTRASOUND INFLUENCE ON THE EXTRACTION OF THE LIQUID FROM THE CLAY-CONTAINING SAMPLES OF POROUS MEDIA // Transactions of Academenergo. -2017. –N 1.-P.P. 131-140.
O.E. Efremova*, E.A. Marfin**
e-mail: defchonkan1@bk.ru, marfin_ea@mail.ru
*Kazan (Volga Region) Federal University
**Kazan Scientific Centre of the Russian Academy of Sciences
Keywords: ultrasound; porous media; clay; porosity; the intensity of vibrations; mineralization; filtration
Abstract
The article deals with the intensification of the liquid mass transfer in porous media with ultrasound. It is known that the effect of elastic vibrations of high intensity has a multifactorial influence on processes occurring in the reservoirs. In this paper experimentally investigated liquid extraction process of the samples of porous media after treatment with ultrasound. Samples of porous media designed from a mixture of clay, sand and water of different salinities. The impact of elastic vibrations on the samples produced in the laboratory by means of ultrasonic technological devices Series “Wave”. The results of the effect of ultrasonic treatment of porous media on the recovery rate of the fluid it. The experimental results indicate that the acceleration of the process fluid extraction of samples treated with ultrasound to 2 times, and increasing the proportion of the liquid extracted to 20% compared to untreated samples. The influence of clay content and salinity of the porous medium to extract the liquid velocity of the liquid sample after sonication. The results can be used when you select wave impact on productive formations in order to increase oil production.