USAGE PATTERN OF JET FANS FOR VENTILATION OF RAILWAY TUNNELS

Open joint-stock company “Lenmetrogiprotrans” St. Petersburg State Mining University USAGE PATTERN OF JET FANS FOR VENTILATION OF RAILWAY TUNNELS Ge...
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Open joint-stock company “Lenmetrogiprotrans”

St. Petersburg State Mining University

USAGE PATTERN OF JET FANS FOR VENTILATION OF RAILWAY TUNNELS Gendler S.G., Sokolov V.A., Savenkov E.A. RUSSIA

INTRODUCTION APPLICATION FIELD OF FORCED VENTILATION OF RAILWAY TUNNELS FOR ELECTRIC PROPULSION ENGINES

In nominal situations: - maintenance pre-selected thermal and humidity conditions; - normalization of radiation environment in the underground working spaces; - minimizing of the ice coating formation; - reduction of the amount of air - entering the tunnel to minimize power consumption for its heating In emergency situations (example, fire): - For evacuation of people and create favorable fire fighting conditions. APPLICATION FIELD OF FORCED VENTILATION OF RAILWAY TUNNELS FOR DIESEL– MECHANICAl PROPULSION

In nominal situations: - securing of the traffic section cleaning from toxic gasses exhausted by the moving locomotives .

Options of jet fans arrangement in railway tunnels

Highway clearance diagram

Railway clearance diagram

Arrangement of jet fans in the gallery and the tunnel inside Jet fans

Concrete gallery

 Direction of air moving

Arrangement jet fans in gallery

Direction of air moving Jet fans

Protective grating

metal frame gallery railway clearance diagram

Arrangement of jet fans in niche and design parameters of niche and jet fans Plan View Niche

Perspective View Niche

L : 3.45 m α :10º 3 L : 10.35 m

Parameters of Niche (L , α) chosen according to CETU (pg 122) Niche

Fan diameter: 1,6 m 7.35 m

Tunnel

Three Jet Fan Model JZR 16-90/6

Nominal thrust: 2810 N Flow of fan : 70.2 m³/s Jet velocity fan : 34.9 m/s

5m

KUZNETSOVSKIY RAILWAY TUNNELS Western portal - appearance

HM =980 m

W.P. gallery

Longitudinal profile

H=35,6 m E.P.

L= 3890 m

Cross section tunnel: 50 m² Cross section gallery: 123 m²

Сleaning of the traffic section from toxic gasses exhausted by the moving locomotives

LYSOGORSKIY RAILWAY TUNNEL

Northern portal - appearance

HM =530 m

N.P.

Longitudinal profile Cross section tunnel: 44,5 m²

S.P. H=17 m L=3020 m

BAIKALSKY RAILWAY TUNNEL

Eastern portal - appearance

360 m E. P.

Longitudinal profile

W. P. H=82 m 6700 m

Cross section tunnel: 34 m²

CFD Simulation Results 100 Pa Natural Draft - NO Jet fans working

Portal A

Niche

3+000

3+410

Contours of Velocity in Different Sections Scale Velocity : 0-5 m/s

3+340

Portal B 6+700

Average Velocity 3 m/s

CFD Simulation Results 100 Pa Natural Draft - NO Jet fans working

5 m above ground level

3 m above ground level

1 m above ground level

Contours of Velocity in Plan View

CFD Simulation Results 100 Pa Natural Draft – 3 Jet fans working

Portal A

Niche

3+000

3+410

Contours of Velocity in Different Sections Scale Velocity : 0-5 m/s

3+340

6+700

Average Velocity 3.2 m/s

CFD Simulation Results 100 Pa Natural Draft – 3 Jet fans working

5 m above ground level

3 m above ground level

1 m above ground level

Contours of Velocity in Plan View Scale Velocity : 0-5 m/s

CFD Simulation Results Dependence of the air velocity in the tunnel on the value of the natural draft

Va, m/s 6 4 2 0 0

200

400

600

P n.d, Pa 800

-2 -4

Green curve – air inflow due to the natural draft only; Blue curve- air inflow due to the natural draft

and 3 jet fans working

CONCLUSION 1. Introduction of the longitudinal ventilation with jet fans is practical in railway tunnels with electric propulsion engine for incident ventilation, in order to control the amount of air delivered to the tunnel due to natural draft and to maintain the desirable thermal and humidity conditions. 2. In railway tunnels with diesel-mechanical propulsion the applicability of the longitudinal ventilation with jet fans is dependent on the required trainhandling capacity of the tunnel. 3. Inside the railway tunnel ventilated using the longitudinal, the jet fans should be located either in galleries at the portals or in the splayed parts which cross sectional area exceeds the cross-sectional area of the tunnel itself. 4. Construction of side niches where jet fans can be located is economically efficient only in rock tunneling.

Acknowledgement Ana Belen Amado Garcia R&D&I Ventilation, Zitron For assistance in carrying out mathematical simulation

Thank you very much for attention