Wyniki wyszukiwania - BazTech

1

COREDIV modelling of JET ILW discharges with different impurity seeding: nitrogen, neon, argon and krypton

Ivanova-Stanik I., Zagórski R.

Nukleonika

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2017

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Vol. 62, No. 1

3--7

EN

Numerical simulations with the COREDIV code of JET H-mode discharges with 25 MW of auxiliary heating in the ITER-like wall (ILW) configuration with different impurity seedings – nitrogen (N), neon (Ne), argon (Ar) and krypton (Kr) – are presented. All simulations have been performed with the same transport model and input discharge parameters like auxiliary heating, volume average plasma density, confi nement factor. Only the seeded impurity puff rate was changed in the calculations. It appears that for the considered heating power of 25 MW and relatively low volume electron average density = 6.2 × 1019 m–3, impurity seeding is necessary. It has been found that for every gas at the maximum level of the seeding rate, allowed by the code convergence, the power to the plate is reduced up to 2–4 MW, with electron temperature at the plate of about 2 eV, indicating semi-detached conditions in the divertor region. It should be noted, however, that in cases with low and medium Z impurity (N, Ne and Ar), tungsten radiation is a signifi cant part of radiation losses and stays above 22–32% of the total energy losses, but for high Z impurity (Kr) it is reduced up to 10% of the total losses. The maximum of the Kr radiation is between the pedestal region and separatrix, showing that radiative mantle can be created, which might have a strong influence on the plasma parameters in the pedestal region.

2

Optimization of the heat treatment process of a steel porous charge using an integrated modelling

Wyczółkowski R., Benduch A.

Advances in Science and Technology. Research Journal

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2014

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Vol. 8, nr 24

13--18

EN

The paper discusses the structure and principle of operation of programs for integrated modelling of the processes of heat treatment of porous-structure steel charges, such as long product bundles or strip or wire coils. Consideration is given to the specificity of these models in respect to porous charges. This is associated with their untypical thermal properties, which are expressed using the concept of effective thermal conductivity.

3

Opis konstrukcji i sposobu działania modułów termicznych programów do zintegrowanego modelowania obróbki cieplnej

Wyczółkowski R., Benduch A.

Hutnik, Wiadomości Hutnicze

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2013

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Vol. 80, nr 6

426--433

PL

W artykule omówiono przykładową strukturę i zasadę działania modułu termicznego, jaki może być wykorzystany w programach do zintegrowanego modelowania procesów obróbki cieplnej wsadów stalowych o strukturze porowatej. Przedstawiono metodykę tworzenia schematu różnicowego dla dwu- wymiarowego elementu walcowego, jakim zastępuje się wsad w postaci wiązki prętów. Przedstawiono również metodykę określania efektywnej przewodności cieplnej wsadów porowatych bazującą na wykorzystaniu analogii cieplno-elektrycznej.

EN

Exemplary structure and work principle of the thermal module was discussed in the peper. This module can be used in programmes used for integrated modeling of heat treatment processes of the porous structure of the steel charges. The methodology of creating differencing scheme of two - dimensional cylindrical element, which is used to represent the charge in the form of a bundle of rods, was shown. The methodology of determining the effective thermal conductivity of porous charges based on the use of thermo-electric analogy also was presented.

4

System for flexible modelling of production cycles based on flat rolling

Rauch L., Madej L., Golab R., Pietrzyk M.

Journal of Machine Engineering

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2009

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Vol. 9, No. 4

39--48

EN

The paper presents design and implementation of computer system dedicated to simulation of production cycles based on the rolling processes. The main functionality of the computer system, i.e. support and facilitation of flat rolling technology design, is obtained through flexible interface combined with the modular architecture of numerical library and optimization procedures. Each production cycle (e.g. heating, rolling, cooling, coiling) is prepared to be calculated separately and finally integrated into the sophisticated production cycle. The architecture of designed software as well as models used for numerical calculations are described in details.The system was tested for various configurations of rolling mills. Three of them together with obtained results are presented in the paper: complex production cycle (roughing and finishing rolling), finishing rolling composed of seven passes and laboratory case study.