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Predicting new double-stack operations in a naturally ventilated tunnel. Presented by: Justin Edenbaum Co-author: Not listed. Agenda. Diesels in tunnels Notched Tunnel Relative Analysis Results Conclusions. Diesels in tunnels. Diesel locomotives outside. Diesels in tunnels. - PowerPoint PPT Presentation
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Presentation Engineer
Predicting new double-stack operations in a naturally
ventilated tunnel
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Presented by:Justin Edenbaum
Co-author:Not listed
Presentation Engineer
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Presentation Engineer
Agenda
Diesels in tunnels Notched Tunnel Relative Analysis Results Conclusions
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Diesels in tunnels
Diesel locomotives outside
Diesel Engine
Emissions
Radiator
Diesel Engine
Emissions
Radiator
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Diesels in tunnels
Diesel Engine
Emissions
Radiator
Diesel locomotives in tunnels
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Diesels in tunnels
Diesel Engine
Emissions
Radiator
Diesel locomotives in tunnels Relative airflow
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Diesels in tunnels Diesel locomotives in tunnels Relative airflow Next locomotives
Diesel Engine
Emissions
Radiator
Diesel Engine
Emissions
Radiator
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Diesels in tunnels Diesel locomotives in tunnels Relative airflow Next locomotives Decrease in performance
Diesel Engine
Emissions
Radiator
Diesel Engine
Emissions
Radiator
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Naturally ventilated tunnels Train performance in tunnel
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Train Speed Relative Airflow
Train configuration
Track grade and curvature
Factors always affecting train
speed
Legend:Factors inside a
tunnel
Locomotive Performance
(inside and outide)
Presentation Engineer
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Presentation Engineer
Agenda
Diesels in tunnels Notched Tunnel Relative Analysis Results Conclusions
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Notched tunnel
A Tunnel– Location (map)– 3,460 meters long
(~2 miles)– 1.65% uphill grade
East to West
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California
Nevada
Notched tunnel
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Notched tunnel
Double stack operations– Notch roof
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Presentation Engineer
Agenda
Diesels in tunnels Notched Tunnel Relative Analysis Results Conclusions
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Presentation Engineer
Relative analysis
Worse-case, grain train– Length ~2km (1.2 miles)– Lead, mid, end consist (3x3x1)– Minimum entering speed
19.3 kph (12mph)
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Tunnel
3,260 m
2,000 m
Grain train
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Relative analysis
Double stack, design case– Length ~4km (2.5 mile)– Lead, mid consist– Simulated speed 24 km (15 mph)
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3,260 m
4,000 m
2,000 m
Tunnel
Grain train
Double Stack
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Relative analysis
Subway Environment Simulation (SES)
SES 2000– One Dimensional Analysis– Aerodynamic and thermodynamic– Freight rail projects
Moffat Mount Shaughnessy Mount Macdonald/Rogers Pass Mullan Stampede Pass
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Relative analysis
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Simulation
Train Speed Relative Airflow
Train configuration
Track grade and curvature
Factors always affecting train
speed
Legend:Factors inside a
tunnel
Locomotive Performance
(inside and outide)
Presentation Engineer
Agenda
Diesels in tunnels Notched Tunnel Relative Analysis Results Conclusions
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Results
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Factor Affects Influenced byVent Analysis
Worse-case grain
Double stack
Double stack
Double stack, Portal Door
1. Speed Input 12 15 17.5 15 mphTime in tunnel Output 640 515 440 515 SecondsMomentum - - Better Better Better RelativeRelative airflow Output Worse Better Better Relative
Locomotive performance -
2. Lead consist performance in tunnel Worse Bett er Better Relative
SpeedRelative airflow quantity* Output 46 42 49 124 m^3/sRelative airflow quality Output - Same Same Same RelativeNumber of locomotives Input - Same Same Same Relative
3. Locomotive performance of consists outside tunnel Better Bett er Better RelativeSpeed -
Train configuration No effect - Better Better Better RelativeConsist configuration No effect - Same Same Same Relative
4. Mid-train consist performance in tunnel Mid Rear Rear Rear LocationSpeed
Relative airflow quantity* Output 46 42 49 42# m^3/sRelative airflow quality Output - Better Better Better RelativeNumber of locomotives Input - Same Same Same Relative
* Lowest simulated value # Probably higher in reality because of increased train speed
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Results
Compared to grain train at 12 mph:– Double stack at 15 mph
Relative airflow less 3D effects unknown All other factors better
– Double stack at 17.5 mph All factors better
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Presentation Engineer
Agenda
Diesels in tunnels Notched Tunnel Relative Analysis Results Conclusions
– Case study: Monitor speeds less 17.5 mph
– Consider tunnel operations24
