I.А. Davletshin, N.I. Mikheev, A.A. Paereliy
CONVECTIVE Heat transfer in THE FLOW WITH FORCED PULSATIONS IN A PLANE CONVERGING CHANNEL // Transactions of Academenergo. -2019. –N 1.-P.P. 7-15. doi:10.34129/2070-4755-2019-54-1-7-15.
e-mail: Davlet60@mail.ru, n.miheev@mail.ru, tapaereliy@yandex.ru
Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences
Keywords: converging channel, pressure gradient, flow pulsations, frequency, amplitude, heat transfer.
Heat transfer on a wall of a plane converging channel was studied experimentally. The paper provides distributions of heat transfer coefficients along the channel in steady and pulsating regimes of air flow. Flow pulsations followed close to harmonic law and were generated by periodic blockage of the open area of the channel by a rotating flap. The range of forced frequencies was 0 – 140 Hz and normalized amplitudes of velocity amplitudes equaled to 0.3–0.8. We chose the ranges of frequencies and amplitudes based on the following arguments. The considered flows are under two effects: pressure gradient due to converging walls of the channel and forced flow pulsations. For the converging channel under consideration, these were the ranges of frequencies and amplitudes at which identical level of pressure gradients associated with channel geometry and wave structure of pulsating flow was observed. Thus, both factors were essential in the specified ranges of parameters. In this situation, the research of heat transfer in pulsating gradient flows was interesting from the perspective of combined influence of the mentioned factors.
The conducted studies revealed significant heat transfer enhancement in pulsating flows. The most pronounced enhancement was observed at the channel inlet reaching as high as 40% in the considered regimes. Downstream of the converging section, the heat transfer coefficient declined. However, the high-amplitude regimes of velocity pulsations exhibited the trend to heat transfer augmentation which was probably caused by the enhancement of transfer processes due to flow separation from the leading edge of the converging channel.

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A.I. Kadyirov, J.V. Karaeva, S.I. Islamova
Investigation of swirl intensity in circular tube induced by short twisted tapes // Transactions of Academenergo. -2019. –N 1.-P.P. 16-27. doi:10.34129/2070-4755-2019-54-1-16-27.
e-mail: aidarik@rambler.ru, julieenergy@list.ru, isvetulia@mail.ru
Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences
Keywords: twist intensity, twisted tape, laminar flow, aqueous solution of Na-Cmc.
The numerical results of swirl intensity in a circular pipe induced by short twisted tapes under pseudoplastic and Newtonian laminar flows are presented. Inserts consist of four, six and eight blades with a twist pitch S / D = 3 … 5 and length up to 4D. The cross-model is used to describe the rheological behavior of a pseudoplastic fluid. An aqueous solution of 1.5% Na-Cmc is considered as a working fluid. The problem is implemented in the Comsol Multiphysics package. Approbation of the package is considered on the example of a laminar flow of water in a circular tube with a twisted tape. 

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R.R. Vildanov, V.P. Tutubalina
THE REGENERATION OF WASTE IN THE ENERGY EQUIPMENT OF TRANSFORMER OIL SELECTIVE TREATMENT ON ALUMINUM OXIDE // Transactions of Academenergo. -2019. –N 1.-P.P. 28-35. doi:10.34129/2070-4755-2019-54-1-28-35.
e-mail: rustrenat@rambler.ru
Kazan State Power Engineering University
Keywords: regeneration of transformer oil, adsorption, aluminum oxide, acid number.
Material in which process of adsorptive regeneration of the fulfilled transformer oil is studied is presented in article. As initial raw materials the fulfilled petroleum transformer oil of selective cleaning which studied characteristics, exceeded maximum permissible values was used. It is shown that process parameters have a considerable impact on oil regeneration. In article the factors affecting quality of regeneration such as adsorption duration, height of a layer of adsorbent and size of ratio oil are analysed: aluminum oxide.
It is found that temperature of transformer oil equal 40 °C is optimum for the studied process what results of the conducted researches testify to. The expediency of regeneration of the fulfilled transformer oil on aluminum oxide is proved. Purified oil on all studied indicators conforms to normative and technical requirements of transformer oil of selective cleaning and can be used as the heat-removing and isolating environment in power transformers on power objects.

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V.A. Khrustalev*, M.V. Garievsky**
e-mail: khroustalevva@mail.ru, garievsky.michael@gmail.com
*Yuri Gagarin State Technical University of Saratov
**Saratov center of science of Russian academy of sciences
Keywords: nuclear power plant, variable mode, system efficiency, main circulation pump, variable frequency drive
The current state of research on the adaptation of nuclear power plants with VVER in Russia to the requirements of power systems can be called insufficient in conditions of accumulating problems. It is possible to increase maneuverability and acceleration of NPP with VVER by installation of variable frequency drives of main circulation pumps. A method for evaluating the system’s technical and economic efficiency of using a variable frequency drive for the main circulating pumps of a nuclear power plant with a VVER-1000 in maneuvering modes and at basic loads higher than nominal is proposed. The main economic effect during the operation of the NPP power unit with a modernized MCP drive is systemic and will be observed when generating energy in the peak mode (with the tariff menu correctly differentiated in time). It is also necessary to take into account the increasing the acceleration of NPP, the savings from replacing new construction, the displacement of gas fuel as a valuable export resource, and the possibility of the participation of NPP units in emergency and frequency regulation.

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  9. Khrustalev V. A., Garievsky M. V. (2017) Increasing the capacity of existing power units with pressurized water reactors: state, problems and prospects Proceedings Academenergo, 4, 77-88.
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N.V. Boychenko, I.S. Ishtyryakov
NUMERICAL ANALYSIS OF STRESS-STRAIN STATE IN COMPRESSOR DISK TAKING INTO ACCOUNT THE DAMAGE ACCUMULATION // Transactions of Academenergo. -2019. –N 1.-P.P. 46-62. doi:10.34129/2070-4755-2019-54-1-46-62.
e-mail: nataboi@ya.ru, ivan_200999@mail.ru
Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences
Keywords: compressor disc, creep, damage, surface flaw, plastic stress intensity factor, creep stress intensity factor
The stress-strain state analysis of the compressor disk was carried out taking into account damage accumulation under various loading conditions in the temperature range. The distributions of elastic, plastic and creep stress intensity factors were obtained by numerical calculation. Elastic, plastic, creep and damage calculation were carried out. The results were obtained for several crack front positions, temperature values and disk rotation angular velocity. The differences in the behavior of elastic and nonlinear fracture resistance parameters depending on loading conditions, crack geometry and temperature are demonstrated. The advantages of nonlinear stress intensity factors using as fracture resistance parameters of materials and structures are shown.

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V.E. Yurin, A.B. Moskalenko, M.A. Murtazov
RESEARCH OF A HEAT EXCHANGER TUBE DURABILITY OF A PHASE TRANSITION ACCUMULATOR, WORKING IN THE COMPOSITION OF NPP // Transactions of Academenergo. -2019. –N 1.-P.P. 63-71. doi:10.34129/2070-4755-2019-54-1-63-71.
e-mail: urin1990777@bk.ru
Saratov Scientific Center, Russian Academy of Sciences
Keywords: phase transition accumulator, nuclear power station, cyclic fatigue, life cycle.
An energy complex including a dual-circuit NPP, a phase transition accumulator and an additional steam turbine was developed. The use of a phase transition accumulator and an additional turbine will allow the NPP to participate effectively in the secondary regulation of the current frequency in the power system. A large number of cycles of overpressure and heating-cooling influences occur in the process of accumulator using. These processes lead to the gradual destruction of the accumulator tubes. The effect of cyclic loads on the accumulator tube as a result of heating, cooling and the effect of internal overpressure was evaluated in this work.

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R.Z. Aminov
COMPREHENSIVE ASSESSMENT OF THE RELIABILITY OF BACKUP DIESEL GENERATORS OF NUCLEAR POWER PLANTS // Transactions of Academenergo. -2019. –N 1.-P.P. 72-80. doi:10.34129/2070-4755-2019-54-1-72-80.
e-mail: oepran@inbox.ru
Saratov center of science of Russian academy of sciences
Keywords: nuclear power plants, diesel generators, reliability, failure, reservation of own needs, deenergizing
A complex indicator of reliability of reserve diesel generators of nuclear power plants is proposed, which as separate components takes into account the probability of failure at startup, loading, as well as in the process of power generation in the performance of the main functional purpose in the event of an emergency. The analysis of the world statistics on failures of diesel generators showed that the impact here can have a very large number of factors, including the modes of start-up and loading, the quality of diesel fuel, which depends on the storage conditions, the quality of lubrication, the adequacy of the modes of control test starts, the conditions at the onset of the initial event, etc. Examples of calculating the complex reliability indicator under different initial conditions, including the duration of power generation up to 72 hours are given.

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J.N. Zatsarinnaya*, D.I. Amirov*, L.V. Zemskova*, R. R. Rakhmatullin**
RESEARCH OF EFFICIENCY OF WORK OF THE SOLAR PANEL UNDER IMPACT ON POLLUTANTS // Transactions of Academenergo. -2019. –N 1.-P.P. 81-92. doi:10.34129/2070-4755-2019-54-1-81-92.
e-mail: amirowdenis@yandex.ru, waysubbota@gmail.com
*Kazan State Power Engineering University
**Gridcom Company
Keywords: solar panels, renewable energy sources, operation of solar modules, pollution of the solar panel, types of pollution, the efficiency of the solar battery, the power of solar panels
The development of civilization is associated with the creation of various methods of energy conversion. Humanity has come a long way from the water wheel to modern power plants. Though earlier people did not think about the damage to the environment from the work of a number of power plants, today this cannot be ignored. Renewable energy sources (RES) and their using by modern technologies claim to play a significant role in the world energy sector. Support for the development of RES in Russia currently based on compensation of costs under contracts for the sale of power in the wholesale electricity and power market. According to the results of the competition of the trading system administrator (TSA), projects under the contracts for renewable energy power supply selected. Analysis of bids of the TSA showed that until 2023 will be introduced 1.8 GW of solar power plants; consequently, the actual goal will be the correct operation of them in the weather conditions of Russia. Pollution of various types, which can be on the panels can affect the operation of solar panels and prevent the ingress of solar radiation on them. The article investigates the influence of various types of pollutants on the power generated by solar panels and promising places for the construction of solar plants in the climatic and geographical conditions of Russia, taking into account possible polluting factors, which can lead to total economic damage of up to 15 million rubles per year.

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