On the problem of the mathematical modeling of the 550 MW hydrogen-cooled turbogenerator rotor thermal state

2017 ◽  
Vol 20 (3) ◽  
pp. 19-24
Author(s):  
Ye. Ovsyannikova ◽  
◽  
Keyword(s):  
Mathematical Modeling ◽  
Thermal State ◽  
Turbogenerator Rotor

Technological Features of the Liquid-Solid State of the Boundary Layer in the Processes of Bimetallic Products

2022 ◽  
Vol 1049 ◽  
pp. 53-61
Author(s):  
Valeriy Lykhoshva ◽  
Dmitry Glushkov ◽  
Elena Reintal ◽  
Valeriy V. Savin ◽  
Ludmila Alexeyevna Savina ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Boundary Layer ◽  
Solid State ◽  
Liquid Phase ◽  
Contact Zone ◽  
Thermal Field ◽  
Thermal State ◽  
Existence Time ◽  
Modeling Data

The hydrodynamic and thermal state in the contact zone of the layers of a bimetallic product obtained by pouring liquid iron onto a solid steel billet, which changes in time and is responsible for the strength of the diffusion joint and the geometric parameters of the transition layer, has been investigated. Simplified analytical dependences, mathematical modeling data and experimental results of the liquid phase existence time in the contact zone based on research of the melt velocities during pouring and changes in the thermal field are presented. It is shown that simplified calculations data coincide in order and are close in values ​​to the calculations of mathematical modeling and experimental data, which makes it possible to use them for preliminary rough estimates by technologists and metallurgists.

scholarly journals Features of Mathematical Modeling of the Thermal State of the Bulb Type Hydrogenerators

2017 ◽  
Vol 0 (10) ◽  
Author(s):  
Oleksii Tretiak ◽  
Olexandr Shut ◽  
Pavlo Gakal ◽  
Vladyslav Ruslanovych Poliienko
Keyword(s):  
Mathematical Modeling ◽  
Thermal State

Multidisciplinary Computer Simulation of Transient Electromagnetic-Thermal Phenomena in a Turbogenerator Rotor

2014 ◽  
Vol 528 ◽  
pp. 278-284
Author(s):  
Michael G. Pantelyat ◽  
Mykola G. Shulzhenko ◽  
Elena K. Rudenko
Keyword(s):  
Computer Simulation ◽  
Finite Element ◽  
Thermal State ◽  
Short Circuit ◽  
Computer Code ◽  
Transient Electromagnetic ◽  
Turbogenerator Rotor ◽  
Two Phases ◽  
Element Technique ◽  
Thermal Phenomena

A finite element technique and computer code for the numerical analysis of 3D transient electromagnetic fields and temperature distribution due to negative sequence currents in large synchronous turbogenerator rotors are developed. Electromagnetic-thermal phenomena in a 300 MVA class turbogenerator rotor during a line-to-line short circuit on two phases of the machine are numerically investigated. Effect of the various conditions of the rotor cooling on its thermal state is studied. Numerical results obtained can be used for the computer simulation of the thermo-mechanical behaviour of the rotor.

Investigation of the Thermal State of Parts to Justify the Possibility of Additive Forming of Nitinol Blanks In Situ

2021 ◽  
Vol 887 ◽  
pp. 46-53
Author(s):  
A.L. Goncharov ◽  
I.S. Chulkov ◽  
E.K. Titarev
Keyword(s):  
Mathematical Modeling ◽  
Electron Beam ◽  
Liquid Metal ◽  
Residence Time ◽  
Liquid State ◽  
Thermal State ◽  
Raw Materials ◽  
Technological Capabilities

In this paper, the substantiation of the possibility of additive forming of nitinol billets by simultaneous surfacing of two titanium and nickel wires with an electron beam in vacuum is given. The method of mathematical modeling shows the possibility of forming several molten pools of liquid metal on the bead being deposited immediately behind the main pool for remelting the formed material. The modes of the electron beam for the formation of the main and two additional remelting pools due to the deflection of the beam are determined taking into account the technological capabilities of the installation. The residence time of the metal in the liquid state is calculated for various additive forming modes. Remelting makes it possible to increase the residence time in the liquid state by a multiple of the molten pools number. This significantly improves the conditions for mixing the raw materials and reduces the heterogeneity of the material.

Cerebral Blood Circulation in Premature Infants by Means of Mathematical Modeling

2015 ◽  
Vol 46 (S 01) ◽  
Author(s):  
R. Lampe ◽  
N. Botkin ◽  
V. Turova ◽  
T. Blumenstein ◽  
A. Alves-Pinto
Keyword(s):  
Mathematical Modeling ◽  
Premature Infants ◽  
Blood Circulation ◽  
Cerebral Blood Circulation
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