V.M.Molochnikov*,**, A.N.Mikheev*, N.I.Mikheev*, A.A.Paereliy*
Averaged flow pattern in the near wake of a circular cylinder estimated from SIV measurements // Transactions of Academenergo. -2018. –N 3.-P.P. 7-22.
*Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences” **Tupolev Kazan National Research Technical University – KAI
Keywords: cylinder, cross flow, near wake, averaged flow, direct numerical simulation, experiment
The averaged cross-flow pattern in the near wake of a circular cylinder was studied experimentally using SIV (Smoke Image Velocimetry) technique developed recently by the authors. The Reynolds number of 3900 was considered. SIV allows estimation of the dynamics of instantaneous two-dimensional velocity vector fields from the flow visualization in a light sheet that is recorded using a high-speed camera. The profiles of streamwise and spanwise velocity components measured along the cylinder wake were compared with direct numerical simulation and experiments reported in the literature. SIV efficiency was confirmed. The behavior of flow velocity distributions that had not been previously revealed by other measurement methods was discussed.
Nikolaeva D.V., Lopatin A.A.
EXPERIMENTAL AND NUMERICAL STUDIES OF HEAT TRANSFER IN A FREE-CONVECTIVE COOLING SYSTEM WITH AXIAL FINNING // Transactions of Academenergo. -2018. –N 3.-P.P. 23-32.
e-mail: Dashulkakuku@mail.ru, AALopatin@kai.ru
Kazan National Research Technical University A.N. Tupolev
Keywords: finning, intensification, surface, convection, heat transfer, numerical simulation, edge cutting, optimization
The heat transfer of an axial split fin is investigated under conditions of free convection. The object of research are the fuel-releasing components of the elements of electric power and radio electronic equipment. The subject of the study is the study of the intensification of heat transfer in free-convective systems for determining the most effective parameters of the design of cooling devices. The purpose of this study is to determine the optimum parameters of the split finning for maximum heat transfer intensification under conditions of natural convection. To achieve this goal, a number of tasks were formulated: the preparation of a model for calculations in the software complex Ansys; a choice of the model of turbulence that reflects the real experimental process; Verification of the heat transfer process; the effect of the heat input method; Determination of the optimal number of cuts of the edge of an edge; optimization of the geometry of the working area with cut edges. In the course of the work, a design model was designed, a grid of the calculation area was built in the section of the program Ansys-Meshing. Boundary conditions are set and thermal calculation is carried out in the software complex Ansys-Fluent. The profiles of temperatures, pressures, densities and velocities of the coolant flow are obtained. Verification of the experimental data with the results of numerical simulation was carried out. The influence of the heat input method and the number of rib dissections on the cooling efficiency is determined. Optimization of the split finning is carried out. The prospects of further research in this field are shown.
F.Kh. Tazyukov, E.R. Kutuzova, A.F. Tazyukova
INVESTIGATION OF VISCOELASTIC FLUID FLOW IN T-JUNCTION ELEMENT OF MICROFLUIDIC DEVICE // Transactions of Academenergo. -2018. –N 3.-P.P. 33-46.
e-mail: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org
Kazan National Research Technological University
Keywords: numerical modeling, convergence of results, Non-Newtonian viscoelastic fluid, T-junction channel, microfluidic devices.
This article is about of study of viscoelastic fluid flow in planar T-junction channel. This branching element may be a typical part of microfluidic devices. Construction of such devices contains a system of microchannels of different shapes, where the different types of flows may be implemented. These devices are called as lab on the chip. They have many unique advantages allowing conduct numerous studies with limited resource of assays. T-junction channels are important parts of such devices due to ability to control the flows at various stage of investigation of fluid’s properties and composition. The usage of so-called hydrodymanics traps allows to conduct investigations the original samples without external influence. The analyzed in these devices fluids are often biological assays. There are nonlinear effects may emerge in the flow owing to complex composition and special properties of fluids. In this paper the viscoelastic fluid flow is presented by rheological FENE-P model. Predicted properties of this model are typical for real fluids. The distribution of main flow characteristics at different section lines at fixed modeling parameters are shown. The comparison of Newtonian and Non-Newtonian fluid flows are presented.
R.F. Kamalov, J.V. Karaeva, V.O. Zdor
INFLUENCE OF THE INCLINATION ANGLE OF THE NOZZLE ON THE CIRCULATION FUEL OIL HEATING // Transactions of Academenergo. -2018. –N 3.-P.P. 47-59.
e-mail: email@example.com, firstname.lastname@example.org, email@example.com
Kazan Scientific Centre of Russian Academy of Sciences
Key words: circulation heating, heat exchange, hydrodynamics, fuel oil (mazut), an inclination angle of the nozzle
The mathematical model and numerical results of heat transfer under circulation fuel oil (mazut, model M100) heating in storage tank are presented. The calculations were conducted for the nozzle angle in the range – 40 till 40 degrees with intermediate step 10 degrees. The environmental conditions such as winter and summer seasons are taken into account to investigate circulation fuel oil heating in the storage tank. It was obtained the exact duration to heat fuel oil in storage tank till 60 degrees of Celsius (known as hot storage temperature) and till 90 degrees of Celsius (known as fuel temperature, which is feed to burner nozzles). Numerical calculations showed that for the inclination angle of the nozzle from – 10 to 40 the fuel oil is heated faster than for the other values of the inclination angle.
Yu.A. Kirsaniov*, D.V. Makarushkin*, A.G. Filimonov**
INFLUENCE OF REGENERATOR ROTOR ROTATION SPEED FOR HEAT EXCHANGE NOZZLE AND STEAM GENERATING UNIT PERFORMANCE INDICATORS // Transactions of Academenergo. -2018. –N 3.-P.P. 60-71.
e-mail: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org
*FSBIS Kazan Scientific Center of Russian Academy of Sciences, Kazan
Keywords: regenerative air heater, rotor, rotation speed, heat transfer, criterial equation, steam generating unit.
A laboratory stand with a regenerative air heater for the study of heat transfer in short-term processes is described. The characteristics of the investigated packets of parallel plates are presented. The results of measurements of the average heat transfer of the plates with different duration of the processes are presented, which are generalized by the criterial heat transfer equation. The obtained criterion heat transfer equation is used for the thermal calculation of the regenerator RVV-54 m in the steam generator TGM-84B. Thermal calculations of the steam generator during combustion of various fuels (natural gas and fuel oil) were performed in conjunction with two regenerators.
D.A. Kovalev*, A.A. Kovalev*, A.A. Nikitina**, Yu.V. Litti**, A.N. Nozhevnikova**,J.V. Karaeva***
APPLICATION OF High Pressure AND conductive MATERIALS FOR INTENSIFICATION OF ANAEROBIC digestion // Transactions of Academenergo. -2018. –N 3.-P.P. 72-80.
e-mail: email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org@mail.ru, email@example.com
* FSBSI «Federal scientific agroengineering center VIM», Moscow
**Research Center of Biotechnology RAS, Moscow
*** Institute of Power Engineering and Advanced Technologies – Subdivision of the Federal Research Center «Kazan Scientific Center of Russian Academy of Sciences», Kazan
Keywords: direct interspecific electrons transfer, increased reactor pressure, conductive materials, anaerobic digestion.
The process flowsheet for organic fraction processing of municipal solid wastes or dunnage manure in anaerobic digesters with use of means of process intensification – high reactor pressure and conductive (electrically conductive) materials as a biomass carrier in a second generation bioreactor is proposed. The possibility of applying the newly discovered synthrophic process of direct interspecific electrons transfer (DIET) to improve the anaerobic digestion efficiency of complex organic wastes is considered. The most effective types of conductive materials used to activate DIET in bioreactors are identified.
R.Z. Aminov1, D.Yu. Kuznetsov2
TO THE QUESTION OF RELIABILITY ESTIMATION OF DIESEL GENERATORS RESERVING OWN NEEDS OF NPP IN CONDITIONS OF COMPLETE DE-ENERGIZATION // Transactions of Academenergo. -2018. –N 3.-P.P. 81-86.
e-mail: firstname.lastname@example.org, email@example.com
1 Saratov center of science of Russian academy of sciences
2 Balakovo NPP
Keywords: nuclear power plant, diesel generator, own needs, de-energization
The averaged values of flow parameters of failure and time between failures of marine diesel engines are generalize and obtained from the analysis of published data for a long period of operation up to 24 thousand hours. The period of running-in has been revealed in the interval from one to four thousand hours of work with the subsequent transition to a stabilized work zone. The received values of the failure flow parameters were used to assess the reliability of the operation of the reserve diesel generators of nuclear power plants when they operate at full load for 72 hours. The results of calculations show that during the specified period of work the probability of failure-free operation can decrease to 0.9.
1A.A. Genbach, 2D.Yu. Bondartsev
LIMITING THERMAL VOLTAGES FOR POROUS COATINGS OF ELEMENTS OF THERMAL POWER PLANTS // Transactions of Academenergo. -2018. –N 3.-P.P. 87-96.
1Almaty University of Power Engineering & Telecommunications
2JS «Trest Sredazenergomontazh»
Keywords: capillary-porous coatings, cooling system, thermoelasticity, thermal stresses, heat transfer.
Annotation. Modeling of the low heat conductive low-porous capillary porous coatings and metal (copper, stainless steel) surfaces (base layer) was studied. The heat source is an electric current and supersonic high temperature pulse detonating flame of the rocket-type burner. Physical and analytical modeling and analogy of the similar heat transfer processes led to the positive outcome. Heat and mass transfer in the porous coatings moved with excessive liquid due to the combined action of capillary and mass forces. The dynamics of vapor bubble was described along with their heat-dynamic properties, which were observed by the optic research methods. “Birth” and “death” of the vapor bubbles occured in a burst manner in the generation centers, which have been considered as the sources of fatigue fracture. Finding solution for the thermoelasticity allowed to reveal the influence of the specific heat flow and heat tension of compression and stretching depending on time of supply and sizes of pulled particles at the time of the system limit state as to “porous coating – base layer”. The theory was confirmed by the trial, which was observed by camcorder SKS-1М. At short interval (~10-2 s) from heat supply the compression stresses only occur, and then they transfer to tension stress as per the coating depth. Specific destructive energy has a distinctive minimum and with rising sizes of particles is moving towards the reduced heat flow.
S.S. Saenko, Yu.Ya. Nikulin, D.A. Vinokurov
RATIONING OF ENERGY CONSUMPTION FOR HEATING BITUMEN // Transactions of Academenergo. -2018. –N 3.-P.P. 97-105.
e-mail: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org
DSTU, EBT Ltd., « Highway» corp
Keywords: energy efficiency class, energy consumption, heating of bitumen.
Heating of bitumen is an energy-consuming procedure. Energy consumption is influenced by a number of factors, namely by the initial and final temperatures, heating period, heat losses and many more. Diversity of metods and technologies of heating and characteristic properties of processing equipment are the reasons of considerable variation of energy consumption. The article dwells on development of a classification for energy consumption rationing for bitumen storage and handling facilities and asphalt-mixing plants. In the article the consumption rates for the A to G energy efficiency classes for the “just-in-time” bitumen supply technology and technologies using bitumen storage facilities were defined.