Nozzle-to-target distance effect on the cooling performances of a jet-impingement helium-cooled divertor

Namkyu Lee, Joon Soo Lim, B. E. Ghidersa, Hyung Hee Cho

Research output: Contribution to journalArticle

Abstract

The power exhaust from high temperature plasma at the level of divertor is one of the biggest technological challenges in the path to establish fusion power reactors. At the Karlsruhe Institute of Technology (KIT), a novel helium-cooled divertor using jet impingement cooling array has been investigated as one of the possible solutions for a DEMO tokamak. The concept, consisting of tungsten armour slabs fixed on a tungsten-laminate tube inside which a jet distribution cartridge is placed, has undergone an extensive optimization process. Among other things, the heat transfer coefficient (HTC) and pressure drop over a divertor unit have been thoroughly looked upon in order to improve the divertor thermohydraulic performance. The present paper is presenting such an optimization study in which the effect on the divertor performances of the distance between the cartridge and the heat loaded surface is investigated. Given the geometrical constraints, the nozzle-to-target surface distance is changed either by increasing the diameter of the inlet manifold, or, by varying the cartridge position, starting from a coaxial configuration, to various positions closer to the impingement surface.

Original languageEnglish
JournalFusion Engineering and Design
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Helium
Nozzles
Tungsten
Cooling
Armor
Heat transfer coefficients
Pressure drop
Laminates
Fusion reactions
Plasmas
Temperature

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

@article{cb274869e544456f80b00d16a7a57d21,
title = "Nozzle-to-target distance effect on the cooling performances of a jet-impingement helium-cooled divertor",
abstract = "The power exhaust from high temperature plasma at the level of divertor is one of the biggest technological challenges in the path to establish fusion power reactors. At the Karlsruhe Institute of Technology (KIT), a novel helium-cooled divertor using jet impingement cooling array has been investigated as one of the possible solutions for a DEMO tokamak. The concept, consisting of tungsten armour slabs fixed on a tungsten-laminate tube inside which a jet distribution cartridge is placed, has undergone an extensive optimization process. Among other things, the heat transfer coefficient (HTC) and pressure drop over a divertor unit have been thoroughly looked upon in order to improve the divertor thermohydraulic performance. The present paper is presenting such an optimization study in which the effect on the divertor performances of the distance between the cartridge and the heat loaded surface is investigated. Given the geometrical constraints, the nozzle-to-target surface distance is changed either by increasing the diameter of the inlet manifold, or, by varying the cartridge position, starting from a coaxial configuration, to various positions closer to the impingement surface.",
author = "Namkyu Lee and Lim, {Joon Soo} and Ghidersa, {B. E.} and Cho, {Hyung Hee}",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.fusengdes.2018.04.012",
language = "English",
journal = "Fusion Engineering and Design",
issn = "0920-3796",
publisher = "Elsevier BV",

}

Nozzle-to-target distance effect on the cooling performances of a jet-impingement helium-cooled divertor. / Lee, Namkyu; Lim, Joon Soo; Ghidersa, B. E.; Cho, Hyung Hee.

In: Fusion Engineering and Design, 01.01.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Nozzle-to-target distance effect on the cooling performances of a jet-impingement helium-cooled divertor

AU - Lee, Namkyu

AU - Lim, Joon Soo

AU - Ghidersa, B. E.

AU - Cho, Hyung Hee

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The power exhaust from high temperature plasma at the level of divertor is one of the biggest technological challenges in the path to establish fusion power reactors. At the Karlsruhe Institute of Technology (KIT), a novel helium-cooled divertor using jet impingement cooling array has been investigated as one of the possible solutions for a DEMO tokamak. The concept, consisting of tungsten armour slabs fixed on a tungsten-laminate tube inside which a jet distribution cartridge is placed, has undergone an extensive optimization process. Among other things, the heat transfer coefficient (HTC) and pressure drop over a divertor unit have been thoroughly looked upon in order to improve the divertor thermohydraulic performance. The present paper is presenting such an optimization study in which the effect on the divertor performances of the distance between the cartridge and the heat loaded surface is investigated. Given the geometrical constraints, the nozzle-to-target surface distance is changed either by increasing the diameter of the inlet manifold, or, by varying the cartridge position, starting from a coaxial configuration, to various positions closer to the impingement surface.

AB - The power exhaust from high temperature plasma at the level of divertor is one of the biggest technological challenges in the path to establish fusion power reactors. At the Karlsruhe Institute of Technology (KIT), a novel helium-cooled divertor using jet impingement cooling array has been investigated as one of the possible solutions for a DEMO tokamak. The concept, consisting of tungsten armour slabs fixed on a tungsten-laminate tube inside which a jet distribution cartridge is placed, has undergone an extensive optimization process. Among other things, the heat transfer coefficient (HTC) and pressure drop over a divertor unit have been thoroughly looked upon in order to improve the divertor thermohydraulic performance. The present paper is presenting such an optimization study in which the effect on the divertor performances of the distance between the cartridge and the heat loaded surface is investigated. Given the geometrical constraints, the nozzle-to-target surface distance is changed either by increasing the diameter of the inlet manifold, or, by varying the cartridge position, starting from a coaxial configuration, to various positions closer to the impingement surface.

UR - http://www.scopus.com/inward/record.url?scp=85046123963&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85046123963&partnerID=8YFLogxK

U2 - 10.1016/j.fusengdes.2018.04.012

DO - 10.1016/j.fusengdes.2018.04.012

M3 - Article

JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

SN - 0920-3796

ER -