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2차모멘트 난류모형을 이용한 정사각 단면 곡덕트 내 발달하는 난류유동 변화에 대한 고찰
전건호,최영돈,신종근,Chun, Kun-Ho,Choi, Young-Don,Shin, Jong-Keun 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.8
Fine grid calculations are reported for the developing turbulent flow in a curved duct of square cross-section with a radius of curvature to hydraulic diameter ratio ${\delta}=Rc/D_H=3.357 $ and a bend angle of 720 deg. A sequence of modeling refinements is introduced; the replacement of wall function by a fine mesh across the sublayer and a low Reynolds number algebraic second moment closure up to the near wall sublayer in which the non-linear return to isotropy model and the cubic-quasi-isotropy model for the pressure strain are adopted; and the introduction of a multiple source model for the exact dissipation rate equation. Each refinement is shown to lead to an appreciable improvement in the agreement between measurement and computation.
전건호(Kun-Ho Chun),전태현(Tae-Hyun Chun),인왕기(Wang-Kee In),양용식(Yong-Sik Yang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The objective of this task is to conduct sensitivity of gap conductance for annular fuel rod. In the annular fuel with an internal cooling hole, part of the heat rate generated in a fuel pellet is transferred to the external coolant in the open fuel pin array and the remaining part proceeds into the coolant flowing through the inner channel. It is important to achieve the accurate determination of the heat flow split because it affects coolant enthalpy and Departure from Nuclear Boiling Ratio (DNBR) in each channel. In particular, when most of the heat rate leans to either inner or outer channel, it is out of thermal equilibrium. For minimizing thermal imbalance, placing another gap in the pellet is introduced. The heat flow distribution between internal and external channels as well as fuel and cladding temperature profiles is finely calculated for the annular fuel rod with or without the fuel gap between inner and outer pellets.
이중냉각연료에서 지지격자의 압력손실에 대한 엔탈피 증가
전건호(Kun-Ho Chun),전태현(Tae-Hyun Chun),신창환(Chang-Hwan Shin) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
A dual side cooling annular fuel having internal and external coolant channels has many advantages basically due to low fuel temperature and high DNBR margin, which can make a significant increase of core power density possible. So recently a 12×12 square annular fuel array was proposed for the fuel assembly to be reloaded without structural interference with operating reactors of OPR-1000s. Even through the inherent potential of the annular fuel on the high power density, it may be seriously eroded in the case of a severe unbalanced mass flux split to the internal and external channels in standpoint of DNB. Mass flux split is determined pressure drop characteristics between inner and outer channels. The spacer grids binding fuel array influence greatly the pressure drop in outer channels and the mass flux split. As an important factor of DNB behavior, the enthalpy differences at both channel exits were evaluated using the mass flux splits.
Ik Kyu Park(박익규),Kun Ho Chun(전건호) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.2
The standard drag force and virtual mass force, which exert to the primary flow direction, are generally considered in two-phase analysis computational codes. In this paper, the lift force, wall lubrication force, and turbulent dispersion force including turbulence models, which are essential for a computational multi-fluid dynamics model and play an important role in motion perpendicular to the primary flow direction, were introduced and verified with conceptual problems.
신종근(Jong Keun Shin),최영돈(Young Don Choi),전건호(Kun Ho Chun) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The paper describes further developments of a near-wall Reynolds stress turbulence closure of<br/> Manceau and Hanjalic (2002), and its application to spanwise rotating flow. To improve the model,<br/> called the elliptic blending model, an inhomogeneity correction is subjected to the near wall<br/> redistribution term. Also, another approach to the near wall redistribution model is attempted for<br/> general complex geometries, which is frequently appeared in industrial applications. The present model<br/> is tested by direct comparisons with the DNS data to validate the performance of the model predictions.