Cfd analysis of the spacer grids and mixing vanes effect on the flow in a chosen part of the TVSA-T fuel assembly

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F15%3A00242209" target="_blank" >RIV/68407700:21220/15:00242209 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.14311/AP.2015.55.0324" target="_blank" >http://dx.doi.org/10.14311/AP.2015.55.0324</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.14311/AP.2015.55.0324" target="_blank" >10.14311/AP.2015.55.0324</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Cfd analysis of the spacer grids and mixing vanes effect on the flow in a chosen part of the TVSA-T fuel assembly

Popis výsledku v původním jazyce

CFD is a promising and widely spread tool for flow simulation in nuclear reactor fuel assemblies. One of the limiting factors is the complicated geometry of spacer grids. It leads to a computational mesh with a high number of cells and with a possibility of decreasing quality. An approach which simulates the flow as precisely as possible and simultaneously at a reasonable computational expense therefore has to be chosen. The goal of the following CFD analysis is to obtain a detailed velocity field in a precise geometry of a chosen part of the TVSA-T fuel assembly. This kind of simulation provides data for comparison that can be applied in many situations, for instance, for comparison with simulations when a porous media boundary condition is applied as a replacement for the spacer grid. The TVSA-T fuel assembly is equipped with combined spacer grids. A combined spacer grid has two functions. The first function is to support the fuel pins as a part of the assembly skeleton. The second function is to ensure coolant mixing with the mixing vanes. The support part is geometrically very complicated. Therefore it is impossible to prepare a good quality computational mesh there. It is also difficult to create a mesh in the support part and the mixing part joint area because of the inaccurate connection between these two parts. A representative part of the TVSA-T fuel assembly with a combined spacer grid segment was chosen to perform the CFD simulation. Some inevitable simplifications of the spacer grid geometry were performed. These simplifications were as insignificant as possible to preserve the flow character and to make it possible to prepare a quality mesh at the same time. A steady state CFD simulation was performed with the k-e realizable turbulence model. Heat transfer was not simulated and only the velocity field was investigated.

Název v anglickém jazyce

Cfd analysis of the spacer grids and mixing vanes effect on the flow in a chosen part of the TVSA-T fuel assembly

Popis výsledku anglicky

CFD is a promising and widely spread tool for flow simulation in nuclear reactor fuel assemblies. One of the limiting factors is the complicated geometry of spacer grids. It leads to a computational mesh with a high number of cells and with a possibility of decreasing quality. An approach which simulates the flow as precisely as possible and simultaneously at a reasonable computational expense therefore has to be chosen. The goal of the following CFD analysis is to obtain a detailed velocity field in a precise geometry of a chosen part of the TVSA-T fuel assembly. This kind of simulation provides data for comparison that can be applied in many situations, for instance, for comparison with simulations when a porous media boundary condition is applied as a replacement for the spacer grid. The TVSA-T fuel assembly is equipped with combined spacer grids. A combined spacer grid has two functions. The first function is to support the fuel pins as a part of the assembly skeleton. The second function is to ensure coolant mixing with the mixing vanes. The support part is geometrically very complicated. Therefore it is impossible to prepare a good quality computational mesh there. It is also difficult to create a mesh in the support part and the mixing part joint area because of the inaccurate connection between these two parts. A representative part of the TVSA-T fuel assembly with a combined spacer grid segment was chosen to perform the CFD simulation. Some inevitable simplifications of the spacer grid geometry were performed. These simplifications were as insignificant as possible to preserve the flow character and to make it possible to prepare a quality mesh at the same time. A steady state CFD simulation was performed with the k-e realizable turbulence model. Heat transfer was not simulated and only the velocity field was investigated.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JF - Jaderná energetika

OECD FORD obor

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Projekt

<a href="/cs/project/FR-TI3%2F615" target="_blank" >FR-TI3/615: Bezpečnost nové generace jaderných elektráren</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta Polytechnica

ISSN

1210-2709

e-ISSN

—

Svazek periodika

55

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

5

Strana od-do

324-328

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-84946095881