E. Da Riva, S. E. Wojnarska 12013-02-28

PS Ventilation- Smoke extraction -

E. Da Riva, S. E. Wojnarska 22013-02-28

Boundary conditions / assumptions: Only SEVS system Extraction in TR3-TR8, 30 000 m³/h each Air inlets in the galleries corresponding to TR1 and T2 Three cases: With 25 000 m³/h injection in the center, without and with open doors in the center

(area 2,5m²)

Air inlets

Smoke extractors

Center

E. Da Riva, S. E. Wojnarska 32013-02-28

Boundary conditions / assumptions: Extraction: velocity ~5m/s, area 1,7m² (velocity inlets) Inlets: TR1: 3,0m X 3,4 m; TR2: 3,0 m X 3,4 m (pressure inlets), central – velocity inlet (1,3m X

0,55m) or pressure inlet 1,25m X 2,0m Tunnel leak tight

E. Da Riva, S. E. Wojnarska 42013-02-28

Results

E. Da Riva, S. E. Wojnarska 52013-02-28

Conventions

“r45” means flow rate in the tunnel between the technical room 4 and 5. Flow rate in tunnels (r12, r23, etc.) is positive when counter-clockwise. Flow rate in galleries is positive when moving radially from the ring center to the outside.

+

+

+

+

E. Da Riva, S. E. Wojnarska 62013-02-28

Velocity in the tunnel (m/s)With air injection in the centerNormal

0.491.57

1.22

0.54

0.34

0.8

0.96

1.35

0.09

0.17

3.04

1.59With doors open in the center

0.08

0.110.14

0.1

0.17

0.03

0.491.4

1.07

0.44

0.3

0.66

0.84

1.19

0.12

0.15

2.67

1.4

0.28

0.3 0.330.110.19

0.33

0.521.24

1.06

0.46

0.28

0.66

0.86

1.19

0.14

0.15

2.62

1.42

0.36

0.33 0.350.05

0.16

0.38

E. Da Riva, S. E. Wojnarska 72013-02-28

Velocity in the tunnel in old simulation with small in_TR2

With air injection in the centerNormal

0.760.79

1.3

0.56

0.38

0.87

0.99

1.38

0.05

0.27

0.70.43

1.14

0.43

0.35

0.74

0.85

1.19

0.07

0.23

3.43

0.68

3.96

0.76

0.07

0.010.35

0.33

0.29

0.14

0.3

0.015 0.2 0.16

0.11

0.33

E. Da Riva, S. E. Wojnarska 82013-02-28

Air flow rates in the tunnel

r12 r23 r34 r45 r56 r67 r78 r81

-150000

-100000

-50000

0

50000

100000InjectionNothingDoors

Air

Flo

w R

ate

[m3/

h]

E. Da Riva, S. E. Wojnarska 92013-02-28

Air flow rates in the galleries

Even galleries have smaller cross section The flow rate values are taken in the center of the gallery (50 meter from the center of the ring)

gallery1 gallery2 gallery3 gallery4 gallery5 gallery6 gallery7 gallery8

-8000

-6000

-4000

-2000

0

2000

4000

6000

8000

10000

12000InjectionNothingDoors

Air

Flow

Rat

e [m

3/h]

E. Da Riva, S. E. Wojnarska 102013-02-28

Velocity in the galleries

gallery1 gallery2 gallery3 gallery4 gallery5 gallery6 gallery7 gallery80.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8InjectionNothingDoors

Air

Vel

ocity

[m/s

]

2013-02-28 11E. Da Riva, S. E. Wojnarska

With air injection in the center

NormalWith doors open in the center

kg/sin_air_cent 8,5047

in_tr1 33,5444in_tr2 19,1877

m/sin_air_cent 9,7100

in_tr1 2,6846 in_tr2 1,5359

kg/sin_air_cent 7,81243

in_tr1 34,34243in_tr2 19,08196

m/sin_air_cent 2,56054

in_tr1 2,74842in_tr2 1,52568

kg/s in_tr1 39,5308in_tr2 21,7061

m/s in_tr1 3,1636in_tr2 1,7355

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Conclusions and suggestions: Central inlet reduces air going from the ring to the galleries Doors open in the center reduces air going from the ring to the galleries even better than air

injection There is no need to instal the fan to inject the air in the center. Opening the doors (2,5m²) will

protect the central room from the smoke from the tunnel With doors open in the center, in the tunnel lower velocity Flushing of smoke will be the worst in r56 due to very low flow rate Openings can significantly change the results – they should be taken into account Efficiency of smoke extraction depends on the position of the fire With air injection in the center/doors in the center, less air is taken from two main inlets

Conclusions

E. Da Riva, S. E. Wojnarska 132013-02-28

END