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Natural convection flow in a cask storage ware house For Toyo Engineering. PHOENICS Version : 3.5.1 DETAILS : BFC grid Three-Dimensional steady flow with heat transfer Buoyancy-influenced flow Surface to surface radiation included NX*NY*NZ= 288*74*42=895,104 NOTES :

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natural convection flow in a cask storage ware house for toyo engineering
Natural convection flow in a cask storage warehouseFor Toyo Engineering
  • PHOENICS Version : 3.5.1
  • DETAILS :
    • BFC grid
    • Three-Dimensional steady flow with heat transfer
    • Buoyancy-influenced flow
    • Surface to surface radiation included
    • NX*NY*NZ=288*74*42=895,104
  • NOTES :
    • The purpose of this model is to establish
    • the temperature distribution and the air flow rate .
geometry
Geometry

x-y plane

nx×nz=288×42

x-y plane

nx×ny=288×74

slide3

Q

A2

A1

A1

Q

A2

outlet

outlet

outlet

outlet

External temperature

23.2℃

External temperature

23.2℃

Radiation model in the cask

cask

Air out

Heat source

: 22.6[kw]

Air in

slide5

Velocity

FlowRate[m3/s] per one cask

Experimentaldata

0.28

0.3

Result of PHOENICS

natural convection flow in a nuclear reactor for denchuken
Natural convection flow in a nuclear reactorFor Denchuken
  • PHOENICS Version : 3.6
  • DETAILS :
    • Cylindrical-polar grid
    • Three-Dimensional steady or transient flow with heat transfer
    • Buoyancy-influenced flow
    • Surface to surface radiation included
    • NX*NY*NZ=40*45*80=144,000
  • NOTES :
    • When an accident happens in the nuclear system, eg the cooling system may fail. Hence, heat will be released solely
    • by natural convection of air flow. The purpose of this model is to establish the distribution of temperature and the air flow rate under these circumstances.
slide8

Air outlet (connected to stack)

Air inlet

(connected to stack)

PRACS

IHX(Heat sink Q=-28.55[MW])

Argon gas zone

Liquid Na convection zone

Pump(11m3/min)

Steady::on

Transient::off

Air convection zone

Radial shield

Reflector

Core

(Heat source Q=30[MW])

Structure of porous media zone

Air Flow

Liquid Na Flow

boundary conditions
Boundary conditions

Heat source and Heat sink:

Steady:-28.55[MW]

Transient:0[WM]

Steady:30[MW]

Transient: change profile

slide10

Pump power :

Steady:11[m3/s]

Transient: change profile.

slide11

Body force (Buoyancy):

Liquid Na convection zone

Air convection zone

slide12

Resistance force in the porous medium zone:

where

K: Pressure resistance coefficient. (This is different in each zone)

ρ:density

U:velocity

slide13

Q

A2

A1

A1

Q

A2

Radiation :

安全容器

コレクタ

原子炉容器

Q1

Q2

radiation

slide15

i

Ai[m2]

ki[-]

n

1

1.0

0.3

2

2

1.0

0.25

2

POTOP

3

-

0.657

2

ΔPf9

4

5.28

1.3

1

5

3.48

0.76

1

ΔPf8

Δh

Δhout

6

1.26

2.6

1

7

-

0.3174

2

ΔPf1

ΔPf2

Δhin

ΔPf3

POUT

PIN

8

1.0

1.5

2

ΔPf7

9

1.0

7.0

ΔPf6

2

ΔPf4

ΔPf5

Pressure value in the air convection zone boundary :

The value of pressure in the air convection zone boundary is renewed

while it is calculated from the next experience equation.

i=6 to 10

i=1 to 5

PITOP

slide17

Maximum temperature [℃]

Experimentaldata

550

540.6699

Result of PHOENICS

Temperature distribution (steady)

slide18

Pressure drop [MPa] in Na convection zone

Experimentaldata

2.5

2.51

Result of PHOENICS

Pressure distribution (steady)

slide19

Air flow rate in the air convection zone.

Maximum temperature in the liquid Na convection zone.

transient simulation in a vapor turbine
Transient simulation in a vapor turbine
  • PHOENICS Version : 3.5.0
  • DETAILS :
    • Cartesian grid
    • Three-Dimensional transient flow
    • NX*NY*NZ=222×218×98=4,742,808
slide21

Air :Fixed temperature

下流側流入境界

Inlet of vapor

Inlet of vapor

Outlet

Nozzle Box : Fixed temperature

slide24

温度出力点

①(0°)

鉛直断面

②(30°)

③(60°)

④(90°)

水平断面

⑤(120°)

⑥(150°)

⑦(180°)

SLICE

POINT1

POINT2

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