COMBUSTION MODELING IN

LARGE SCALE VOLUMES

ICHS 2013, 9 – 11 SEPT, BRUSSELS, BELGIUM

A.Velikorodny, E. Studer, S. Kudriakov, A. Beccantini

6 SEPTEMBRE 2013 | PAGE 1CEA | 10 AVRIL 2012

BACKGROUND

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Three Mile Island accident in 1979 had

demonstrated and Fukushima accident in

2011 recalled that hydrogen combustion and

explosion can have a dramatic effect on the

nuclear power plants (NPPs).

Analysis of such large scale scenarios is a

relevant issue, which might be accessed

through CFD modeling.

LARGE SCALE MODELING ISSUES

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Various turbulent and

chemical scales Various gas dynamic

and flame propogation regimes

LARGE SCALE MODELING ISSUES (2)

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RDEM MODEL

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MODEL FOR K0: Lt Const

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MODEL 1:

MODEL FOR K0: Lt VARIABLE IN 2D

MODEL 2:

Cu = 1.0BROWN et ROSHKO 1974

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MODEL FOR K0: Lt VARIABLE IN 3D

MODEL 3:

Cu = 1.0

Uc

!

where

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b

b

RUT FACILITY

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TMI

HDR, FMGlobal and other FACILITIES

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HDR

FMGlobal

+ DRIVER, ENACCEF, BATELLE, THAI

STM7, MODEL 1: TD diagram, pressure, surface, u’

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STH9, MODEL 1 and MODEL 2: Pressure curves

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STH9, MODEL 2: Integral scale

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SOME OTHER RUT TESTS

T13 (Xh2 = 0.11):BR=0.3 T23(Xh2 = 0.112): BR=0.6

ICHS | 10 SEPT 2013

T22(Xh2 = 0.14): BR=0.6

User factor in Model 1 was

influenced by the hydrogen

content.

Same is true for Uc parameter

in Model 2.

Thus, in Model 3: Uc = f(S_L)

STM7 and STH9, MODEL 3: TD diagram and pressure

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CONCLUSIONS

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• Hydrogen combustion in NPPs using RDEM with three K0 Models.

• Large set of experiments has been used to calibrate parameters of

these models. Effects of geometry, BR, hydrogen/steam content,

concentration gradients, etc. were considered.

• Modeling of severe accidental scenarios in real-scale NPPs is

currently underway.

ICHS | 10 SEPT 2013