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...
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