The numerical modelling of three-dimensional unsteady viscous gas flow and aeroelastic behaviour of blades in compressor stage with taking into account the tip leakage flow has been performed on the base of solution for coupled problem of unsteady aerodynamics and blades elastic oscillations.The numerical analysis results for flow structure, unsteady loads, amplitude-frequency spectrum of blades oscillations and energy losses under presence of tip leakage flow has been presented.

Keywords:
compressor stage, viscous gas flow, unsteady loads, elastic blade oscillations, coupled problem.

Gnesin V.I., Kolodyazhnaya L.V., Zhandkovski R. The numerical analysis of unsteady loads and blades oscillations for compressor stage in three-dimensional viscous flow with taking into account the tip leakage. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 5-17.

The comparison between numerical experiment and natural experiment was done. The isolated turbine stage flow was calculated. Integral and local height characteristics of the flow were obtained. Dependency of performance from the height of peripheral clearance was built. Conclusion about ability of using numerical experiment for solving isolated turbine stage optimization problems was made.

Keywords:
verification of CFD calculation, isolated turbine stage, intermittency coefficient, outflow in peripheral clearance.

Boiko A.V., Maksіuta D.I. Verification of numerical calculation of work-stage axial turbine with regard to peripheral leakage. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 18-23.

Nonlinear mathematical models of automatic control systems of steam turbine K-1000-60/1500 are built in the space of states with different regulators. Vector objective function is proposed for multi-objective optimization of control systems of steam turbine. The results of multi-objective parametric synthesis of nonlinear systems of frequency stabilization are presented.

Keywords:
steam turbine, control system, mathematical model, multi-objective optimization, vector objective function.

Severin V.P., Nikulina E.N., Godlevskaya K.B. Multi-objective optimization of control systems of steam turbine К-1000-60/1500 on the base of vector objective function. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 24-29.

The structure of operating medium flow in the gap between the rotating disk and the stationary wall when the gap is in the range of 1,8–5,8 mm, which corresponds to the front neardisk’s gap in the stages of HPC and MPC steam turbines was investigated.

Keywords:
annular radial diffuser, rotating disk, gap, static pressure, radial and tangential velocity components.

Goloschapov V.N., Alehina S.V., Simbirskaya O.A. Modeling the structure of operating medium flow in the gap between the rotating disk and the stationary wall. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 30-33.

Computational investigations of last stage steam turbine rotor blade hub zone are performed. It is shown that reducing hub fillet improved gas dynamics without reducing strength characteristics.

Keywords:
turbine rotor blade, hub zone, fillet, strength, gas dynamics.

Subbotovich V.P., Yudin Yu.A., Yudin A.Yu., Boyarshinov A.Yu. Investigation of hub zone turbine rotor blade. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 34-37.

The implicit iterative difference scheme based on the Newton method was built for multidimensional equations of gas dynamics in Navier-Stokes form. Methods of linearization and factorization are not used for differential operators for discretizing the initial equations. Approximation of time derivatives is made on three-point pattern with second order backward difference formula, spatial derivatives are approximated with high-resolution TVD and ENO schemes. Numerical modelling of three-dimensional viscous and two-dimensional inviscid flows was made. It was showed an accordance of obtained results with experiment. An evaluation of rate of convergence and limit of Courant number was made for implicit iterative scheme and Beam-Warming scheme.

Keywords:
Navier-Stokes equations, implicit iterative scheme, Newton method, TVD, ENO, approximation order.

Grizun M.N., Ershov S.V. Numerical modeling of multidimensional compressible flows with Newton method. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 38-46.

A technique for the experimental determination of the dynamic characteristics of the LPC on the stand «Turboatom». A comparison of the experimental amplitude-frequency characteristics (AFC) for the type series enclosures LPC «beam» class with the simulation results. Adjusted damping model and methods of experimental response in determining the damping constant of LPC.

Keywords:
turbine casing, vibration, dynamic compliance, damping model, parametric modeling.

Stepchenko A.S., Kabanov A.F., Dudkina E.N. Experimental determination of the dynamic characteristics of the turbines LPC casing «rod-type» and analysis of their damping properties. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 47-55.

The issues has been treated connected of determination of residual resource of service of high temperature knots of turbine. Factors determining duration of reliable exploitation of turbine are analysed: exhausting of the protracted plasticity from the creep of material; accumulation of damages in the critical areas of rotors because of a cyclical fatigue.

Keywords:
rotor, creep and long-term durability, cyclic fatigue.

Suhinin V.P., Pugacheva T.N. Criteria for determining the high life steam turbine rotor. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 56-62.

General statement of the problem of the gas-turbine-driven compressor plant enclosure heat state and appropriate mathematical model are developed. Numerical simulation results showed that enclosure envelopes temperatures numerical evaluations are highly sensitive to the engine case outer surface temperatures and solid surfaces emissivities.

Keywords:
gas-turbine, sound and heat proofing, ventilation, cooling, flow, heat and mass transfer, Reynolds averaged Navier-Stokes equations, radiation transfer equation, finite volume method, discrete ordinate method, temperature fields.

Kostyuk V.E., Kirilash E.I. Numerical simulation of gas-turbine-driven compressor plant enclosure heat state. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 63-72.

With the purpose of realization of objective estimation of efficiency of deep utilization of warmth of leaving from boilers product of combustion of gas fuel it is suggested to unite a boiler and heat utilization devices in technical close system, to execute her calculation research and estimate his results.

Keywords:
system «boiler-heat utilizer», deep heat recovery, flue gases, water vapor condensation, methods of thermal calculation, design heat exchanger circuit, the efficiency of the utilization of technology.

Efimov A.V., Goncharenko A.L., Goncharenko L.V. System of deep heat recovery from gases, leaving the boiler. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 73-80.

It was carry on numerical investigation the processes of hydrodynamics and mixing of fuel and oxidizer in a jet-niche system burning gaseous fuel with supplying gas throw single and double raw of fuel round holes.

Keywords:
jet-niche system, working procedure, mixing, explosion limit, duplex fuel supply, mathematical modeling, burner device.

Abdulin M.Z., Seryy A.A. Isothermic research of burners modules based on jet-niche systems. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 81-88.

The article deals with the theoretical research of the coal gasification processes with different oxidizer composition. The model of thermodynamic equilibrium was used for the prediction of gasification characteristics for different coals. The basic parameters and optimal regimes of coal gasification processes are defined.

Keywords:
gasification, coal, synthesis gas, equilibrium composition, plasma.

Serbin S.I., Goncharova N.A. he comparative analysis of various coal gasification morphological structure. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 89-93.

The method of determining optimal degree of cooling the agent in the heat pump evaporator for low-temperature heating systems using different renewable energy sources is designed. Maintaining optimal degree of agent’s cooling provides minimal unit costs on external energy for heat pump heating system as a whole.

Keywords:
low-temperature heating system, heat pump, solar collector, optimal degree of cooling the agent.

Bezrodnyy M.K., Pritula N.A. On optimum working conditions of heat pump heating systems with usage of renewable heat. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 94-103.

The methods and tools for determining the efficiency of heat supply of housing estate on the basis of mathematical modeling of the system by which an analysis is made of upgrade and renovation in order to save energy and improve the quality and reliability of heat supply are making. Shown and proved that the existing district heating scheme should be changed in order to improve its efficiency and reliability. The results of calculations using the developed methods and tools are the basis for a feasibility study of relevant projects.

Keywords:
heating system, heat losses, mathematical modeling, energy conservation, energy efficiency.

Ganzha A.M., Marchenko N.A., Pidkopay V.M. Rationale variant reconstruction system supplies heating energy residential joined laminated panels with using mathematical modeling of heating energy losses during transportation at coolant. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 104-109.

To use the waste heat of blast stoves flue gases offered as utilizer to use U-shaped metallic recuperative heat exchanger for preheating of combustion air used for autonomous heating systems in regenerators. To create an accounting basis was made a blast stoves temperature regime parameters modeling, methods and results of the calculation of changes of temperature of flue gases along regenerator flue path, the results of thermal calculations of heat recovery unit were presented.

Keywords:
Hot blast stoves; waste gases; heat recovery unit; temperature.

Koshelnik O.V., Zaec O.M., Koshelnik V.M. Prediction of the heat medium modes of the regenerative hot blast stoves for calculation of heat recovery unit. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 116-124.

A mathematical model of the generalized variables in non stationary heat conduction for system with imperfect thermal contact at the joints is presented. The purpose of this study is the development of mathematical models of friction units and dimensioning of heat release from the solution of inverse heat conduction problems. The Obtained results allow us to estimate a varied combinations of the parameters multilayer system of plates, heat release functions, and control the thermal state of the system. Results of computational experiments are given.

Keywords:
thermal conductivity, friction units, frictional interaction, non-linear inverse problem, the physical and mechanical properties, heat transfer boundary conditions.

Veselovskiy V.B., Samun R.O. Research and restoration the function of heat in friction units on the temperature data. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 125-130.

Considered a trend change thermotechnical characteristics of solid fuel that supplied to power stations in Ukraine. Proved priority of using of non-project solid fuels their own fields for the long term.

Keywords:
non-project solid fuel, thermotechnical characteristics of fuel, moisture, ash content, calorific value.

Kapustyanskiy A.O. Dynamics of quality changing of solid fuel coming onto TPS. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 131-135.

In work the modern problem of power – alignment of daily electricity consumption at the expense of night accumulation of heat is considered. Modeling of processes of a discharge of firm accumulators of heat with flat inserts is carried out.

Keywords:
heat accumulators, heat exchange intensification, radiation inserts, heat exchange surface, thermal stream.

Klimchuk A.A., Shramenko A.N. Methods of an intensification of processes of a discharge in channels of accumulators of heat on the basis of firm materials. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 136-139.

The paper deals with development of a methodology of the life-time prediction of the bolted connection of the water turbine impeller. The developed method is applied to the bolted connection of turbine PL40-V700. Also in the paper the natural vibrations of the rotor has been analyzed, as well as the load and the resulting stress-strain state in transient modes in water turbine has been obtained.

Keywords:
life-time prediction, bolted connection, water turbine, high cycle fatigue.

Vodka A.A., Trubaev A.I. A method for the life-time prediction of bolted connection of the hydro turbine impeller. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 140-148.

The paper shows that the maximum efficiency ideal stage, depending on the constraints, can be achieved as the axial outlet flow and with some twist of the effluent.

Keywords:
turbine, stage, options, efficiency, axial flux output.

Slabchenko O.N. The one-dimensional theory of ideal stage axial turbine. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 149-156.

Completed calculated study of unsteady thermal conditions thermal storage element of the electric thermal storage (ETS). Evaluated of the impact of geometrical parameters of the air channel on the temperature distribution in the thermal storage element in the charge and heat loss. Selected rational geometric parameters of element ETS.

Keywords:
electric thermal storage, electric heating, heat storage material.

Tarasova V.A., Khimenko A.V. Choice of rational geometrical parameters element of electric thermal storage. NTU «KhPI» Bulletin: Series «Power and Heat Engineering Processes and Equipment». 2013. No. 13. Pp. 110-115.