relative analysis
DESCRIPTION
Relative analysis. Simulation. 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. Relative analysis. Model inputs. - PowerPoint PPT PresentationTRANSCRIPT
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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)
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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
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Relative analysis
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Global Tunnel
Local Middle Consist
Internal Loco Model
Diesel Engine
Radiator
Emissions
Models
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Model inputs Tunnel geometry Friction factor Calibration
Relative analysis
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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)
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Presentation Engineer
Input constant speed Relative airflow to locomotives
Quantity Quality
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Relative analysisSimulation – Inputs and outputs
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ResultsLead Loco, Relative Airflow airflow
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Worst-case grain 19 kph (12 mph)
Double stack 24 kph (15 mph)
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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)
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ResultsMid loco consist, relative airflow
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Worst-case grain 19 kph (12 mph)
Double stack 24 kph (15 mph)
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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)
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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)
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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 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
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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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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Questions? What is a long tunnel? Naturally ventilated tunnels Notched tunnel Relative analysis Results Conclusions
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Justin Edenbaum [email protected]