HEAT AND POWER ENGINEERING FUNDAMENTALS
P.S.Zanko*, N.I.Mikheev*, D.V.Kratirov**, K.R.Hayrnasov**
DIGITAL HOT WIRE FOR VELOCITY MEASUREMENTS IN FLOW WITH VARYING TEMPERATURE // Transactions of Academenergo. -2014. -N 4. –P. 7-15.
e-mail: zanko_philipp@mail.ru , n.miheev@mail.ru , dkratirov@gorgaz.r u , Kosty@gorgaz.ru
* Research Center for Power Engineering Problems of the Russian Academy of Sciences
** Science-Manufacturing Enterprise «IRVIS» (Kazan)
Keywords: hot-wire, turbulent, overheat ratio, compensation, calibration.
Abstract
Results of velocity measurements in a turbulent flow in a round pipe obtained using an experimental digital hot-wire device with a constant overheat ratio are presented. This device works switching between two modes – the velocity measuring mode and the temperature measuring mode. Changing of the flow temperature causes changing of the electric current through the wire in the velocity measuring regime so that the difference between the temperature of the wire and the flow temperature remains constant. Such a concept of the device gives a capability to compensate automatically flow temperature changes during velocity measurements. Uncertainty of velocity measurements when there is flow temperature changing from 30 to 40º С is estimated.
V.N. Kovalnogov, U.A. Khakhalev, L.V. Khakhaleva
PRACTICAL USING RESULTS OF NUMERICAL EXPERIMENTS BASED ON THE CHAOS MODEL IN COOLED TURBINE BLADES // Transactions of Academenergo. -2014. -N 4. –P. 16-29.
e-mail: kvn@ulstu.ru , ulstu-td-ua@mail.ru , larvall@mail.ru
Ulyanovsk State Technical University
Keywords: turbulent flow, pressure pulsations, chaos, fractal dimension, modeling, numerical investigation, cooled turbine blades
Abstract
The numerical investigation of the turbulent flow with the impacts based on a modified Prandtl mixing length model using fractal dimension of pressure fluctuations, had conducted and were received the results. These results allowed us to propose a new design of a cooled turbine blade. The turbine blade comprises a combined cooling and cylindrical cavities on the blade surface, and on the inner surfaces of the cooling channels too.
A.V. Shchukin, I.Ya. Khasanshin, A.V. Ilyinkov, V.V. Takmovtsev
HEAT TRANSFER ON CONVEX SURFACE WITH DISCRETE ROUGHNESS ELEMENTS // Transactions of Academenergo. -2014. -N 4. –P. 30-38.
e-mail: turbom@turbom.kstu-kai.ru
Kazan Scientific-Research Technical University by A.N. Tupolev
Keywords: cooling system, heat transfer augmentation, spanwise semicylindrical ribs, centrifugal body force, streamwise curvature of convex surface.
Abstract
The effect of streamwise curvature of convex surface of flat channel on heat transfer of the section between spanwise semicylindrical ribs has been experimentally investigated. Heat flux has been evaluated using gradient method. The regularities of convective heat transfer in the considered conditions have been experimentally determined depending on relative surface curvature. It has been established that the increase of relative curvature of streamlined surface leads to enhanced effect of ribs on convective heat transfer.
POWER GENERATION STATIONS
P.V. Rotov
EVALUATION OF THE ENERGY EFFICIENCY OF THE TECHNOLOGY OF QUANTITATIVE REGULATION OF THERMAL LOAD ON THERMAL STATION // Transactions of Academenergo. -2014. -N 4. –P. 39-50.
e-mail: p.rotov@rambler.ru
Ulyanovsk State Technical University
Keywords: centralized district heating, cogeneration systems, central heat load control, energy efficiency
Abstract
The technology quantitative regulation of load of heating systems on thermal station, developed in the research laboratory “Thermal energy systems and installations” Ulyanovsk State Technical University considered. Defined operating parameters and the estimated energy efficiency of thermal station in the quantitative regulation of the heat load. A comparison of modes of thermal station with quantitative and qualitative regulation of heat load heat supply system.
POWER AND MECHANICAL ENGINEERING
V.N. Shlyannikov, I.S. Ishtyriakov
PARAMETERS OF STRESS-STRAIN STATE FUNCTIONS FOR D16T ALLOY // Transactions of Academenergo. -2014. – N 4. –P. 51-63.
e-mail: shlyannikov@mail.ru , ivan_200999@mail.ru
Research Center for Power Engineering Problems of the Russian Academy of Sciences
Keywords: complex stress strain, Lode – Nadai parameter, triaxiality parameter, strength and fracture theory, hollow cylindrical specimen.
Abstract
For the experimentally obtained limiting stresses and strains on hollow cylindrical specimens of D16T aluminum alloy the Lode-Nadai and stress triaxiality parameters for eight combinations of tension/compression, torsion and internal pressure are determined. It is found on the basis of the numerical calculations, that there is a common for linear and elastic-plastic deformation of the relationship between the functions of the stress state under the complex loading. The possibility of using patterns found in the formulation of theory of limit state is discussed.
A.V. Tumanov
AUTOMATIZATION OF MIXED MODE CRACK GROWTH RATE TEST USING DROP POTENTIAL METHOD // Transactions of Academenergo. -2014. – N 4. –P. 64-71.
e-mail: tymanoff@rambler.ru
Research Center for Power Engineering Problems of the Russian Academy of Sciences
Keywords: mixed mode cracks, drop potential method, crack growth rate, test automation, fatigue test
Abstract
Series of tests for compact tension-shear specimens was carried out. During the experiment the relationship between a crack size along curvilinear path and potential drop measurements on the crack flanks was obtained. A linear relationship between a drop potential signal and residual cross-section of test specimen was found. A new method for a mixed mode crack growth rate characteristics determination was proposed. Proposed algorithm can be applied when the crack path cannot be directly observed like tests at extremely high or extremely low temperature.
V.N.Shlyannikov, B.V.Ilchenko
DAMAGE ZONE MODELING FOR CRACKS OF VARIOUS SHAPES UNDER BIAXIAL LOADING OF THE FUSELAGE // Transactions of Academenergo. -2014. – N 4. –P. 72-83.
e-mail: shlyannikov@mail.ru , ilchenkoboris@pochta.ru
Research Center for Power Engineering Problems of the Russian Academy of Sciences
Keywords: fuselage panel, biaxial loading, crack, strain energy density, cohesive zone, finite element method
Abstract
For fuselage panels under internal pressure loading presents an analysis of the state of the damage zone at the crack tip. In the developed FEM meshes of the longitudinal and transverse frame structure introduced special set of finite elements for modeling cohesive zone at the crack tip. The calculations of the parameters of the stress strain state panel with rectilinear and curvilinear cracks was carried out, which resulted in the estimation of the influence of the cohesive zone in the distribution of strain energy density parameter.
R.R. Yarullin, I.S. Ishtyriakov
THE STRESS-STRAIN STATE ANALYSIS FOR D16T ALLOY HOLLOW CYLINDRICAL SPECIMEN UNDER COMPLEX STRESS STATE // Transactions of Academenergo. -2014. – N 4. –P. 84-96.
e-mail: yarullin_r@mail.ru , ivan_200999@mail.ru
Research Center for Power Engineering Problems of the Russian Academy of Sciences
Keywords: finite elements method, stress strain fields, complex stress state, hollow cylindrical specimen, tension, compression, torsion, pressure.
Abstract
The stress-strain state analysis for a full-size three-dimensional model of D16T alloy hollow cylindrical specimen under complex stress state was performed. With using of experimental data obtained from combined loading tests the distributions of the true elastic-plastic fracture stress and strain on the cylinder wall thickness was determined.
ECONOMICS, ECOLOGY, INNOVATIVE TECHNOLOGIES AND PROCESSES IN POWER ENGINEERING
Ya.I Kravtsov*, A.F. Sadykov**, E.A. Marfin*, A.A. Abdrashitov*, S.Ya. Kokhanova***
TRENDS IN THE DEVELOPMENT OF GENERATORS OF HEATING MEDIUM, INTENDED FOR THERMAL ACTION ON THE OIL RESERVOIR // Transactions of Academenergo. -2014. – N 4. –P. 97-110.
e-mail: kravtsov-34@mail.ru , info@tatnii.ru , marfin76@mail.ru , abdary@mail.ru , skokhanova@yandex.ru
*Research Center for Power Engineering Problems of the Russian Academy of Sciences
**Tatar Research and Design Institute of Petroleum Engineering
***Kazan National Research Technical University named after A.N. Tupolev – KAI
Keywords: power installation, heat generator, aviation gas turbine engine, the thermal impact, coefficient of performance.
Abstract
The article presents the trends in the development of generators of heating medium, intended for thermal action on the oil reservoir. We study problem of improving the efficiency of oil production. Prospects for solving this problem with using the generators heating medium based aircraft power plants with spent flying resource is examined. Comparison of the characteristics of different types generators is presented.
V.I. Sharapov
ABOUT ASSESSMENT OF SCIENTIFIC NOVELTY DISSERTATION WORK IN THE THERMAL ENGINEERING // Transactions of Academenergo. -2014. – N 4. –P. 111-118.
e-mail: vlad-sharapov2008@yandex.ru
Ulyanovsk state technical university
Keywords: dissertations, technical sciences, scientific novelty, inventions, software.
Abstract
The article presents of inventions assessment as elements of scientific novelty of dissertation work for the degree of doctor and candidate of technical sciences. Offered an analysis of laws and regulations. They relate to the award of degrees and recognition of technical solutions inventions. It is shown that in the doctoral and candidate’s dissertations, which are the subject of a new science-based technical and technological solutions, the invention is a necessary element of proof and indisputable scientific novelty of dissertations. An example of an experimental scientific substantiation of the technical solution, protected by a patent in the candidate’s dissertation on technical sciences. The results of theoretical scientific basis of patented technical and technological solutions recommended take the form of software products with the state registration. It is noted that in the technical sciences patent culture is an integral part of the general culture of scientific work.
