presentation engineer relative analysis 17 simulation
TRANSCRIPT
Presentation Engineer
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
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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
Presentation Engineer
Relative analysis
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Global Tunnel
Local Middle Consist
Internal Loco Model
Diesel Engine
Radiator
Emissions
Models
Presentation Engineer
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Model inputs
Tunnel geometry Friction factor Calibration
Relative analysis
Presentation Engineer
Relative analysis
Locomotive data– Field test data (Other projects)– CFD Simulations (Computational
fluid dynamics)– Past experience
Locomotive input– Heat release– Emission rates– Derating
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Presentation Engineer
Relative analysis Input constant speed
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CONSTANTTrain 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
Input constant speed Relative airflow to locomotives
Quantity Quality
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Relative analysisSimulation – Inputs and outputs
Presentation Engineer
ResultsLead Loco, Relative Airflow airflow
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Worst-case grain 19 kph (12 mph)
Double stack 24 kph (15 mph)
Presentation Engineer
ResultsLead Loco, Relative Airflow airflow
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Worst-case grain 19 kph (12 mph)
Double stack 24 kph (15 mph)
Double stack 28 kph (17.5 mph)
Double stack 32 kph (20 mph)
Presentation Engineer
ResultsMid loco consist, relative airflow
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Worst-case grain 19 kph (12 mph)
Double stack 24 kph (15 mph)
Presentation Engineer
ResultsMid loco consist, relative airflow
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Worst-case grain 19 kph (12 mph)
Double stack 24 kph (15 mph)
Double stack 28 kph (17.5 mph)
Double stack 32 kph (20 mph)
Presentation Engineer
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
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 mph
Time in tunnel Output 640 515 440 515 Seconds
Momentum - - Better Better Better Relative
Relative airflow Output Worse Better Better Relative
Locomotive performance -
2. Lead consist performance in tunnel Worse Better Better Relative
Speed
Relative airflow quantity* Output 46 42 49 124 m^3/s
Relative airflow quality Output - Same Same Same Relative
Number of locomotives Input - Same Same Same Relative
3. Locomotive performance of consists outside tunnel Better Better Better Relative
Speed -
Train configuration No effect - Better Better Better Relative
Consist configuration No effect - Same Same Same Relative
4. Mid-train consist performance in tunnel Mid Rear Rear Rear Location
Speed
Relative airflow quantity* Output 46 42 49 42# m^3/s
Relative airflow quality Output - Better Better Better Relative
Number of locomotives Input - Same Same Same Relative
* Lowest simulated value # Probably higher in reality because of increased train speed
Presentation Engineer
Results
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
What is a long tunnel? Naturally ventilated tunnels Notched tunnel Relative analysis Results Conclusions
– A Tunnel: Monitor speeds less than 24 kph (17.5 mph)
– Limits in naturally ventilated tunnel
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Presentation Engineer
Questions?
What is a long tunnel? Naturally ventilated tunnels Notched tunnel Relative analysis Results Conclusions
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Justin Edenbaum [email protected]