Freight train analysis - Deepansh Arora
Transcript of Freight train analysis - Deepansh Arora
FREIGHT TRAIN DRAG
ANALYSIS
Company 011
Deepansh Arora, Robert Mabrey,
Ruben Reyes, Tenzin Sherpa
https://www.topsimages.com/images/gone-like-frate-train-a6.html
• Characterize the drag variation
at each subsequent containers
of a freight train due to drafting.
https://www.topsimages.com/images/
bnsf-conductor-and-engineer-a2.html
Objective
BackgroundKnowledge -- Aerodynamic Drafting
- 'Numerical study on the aerodynamic
drag of drafting cyclist groups' - Bert Blocken
-- Bluff body Aerodynamics
- Flow fields around a container freight train
-David Soper
According to J. Riley's work from UIUC,
Background Knowledge (Contd.)
Edwards , J. R., and Barkan, C., “Train Energy,
Power and Traffic Control,” University of Illinois
at Urbana-Champaign, 2010.
• High Velocity equates to high air
resistance
• Effect on fuel economy
• Rolling resistance
-- Model Scaling
-- Drag force measurement
-- Boundary layer problem
Our Approach
Test Preparation
• Locomotive
• Containers
• Well Carts
Models Used Apparatus
• 3 x 4 Wind Tunnel
• Vernier Load Cell
• Vernier Lab Pro
- 1/56th scale model size
- Material used - wood
Metric Cart and Drag Quantification
1 2 3
45
Model Design, Building and Installation
Model Design, Building and Installation
1 2 3
54 6
Model Design, Building and Installation
2 3 4 51
Experimental Investigation
Metric Cart Placement
2
Drag Measurement
1 3
Installation
Engineering Estimates
Results
Results (cont.)
Conclusion
Drag (lb) Cd Drag (lb) Cd Drag (lb) Cd
Metric at Location One 0.058 0.152 0.094 0.185 0.114 0.187
Metric at Location Two 0.103 0.271 0.138 0.272 0.168 0.276
Metric at Location Three 0.085 0.223 0.121 0.238 0.151 0.248
Metric at Location Four 0.044 0.115 0.089 0.175 0.126 0.206
Metric at Location Five 0.170 0.447 0.242 0.476 0.293 0.480
Standalone Metric 0.269 0.707 0.387 0.761 0.469 0.770
Q = 15 psf
Re =116,000
Q = 20 psf
Re = 134,000
Q = 24 psf
Re = 146,000Configuration
Description
Experimental Recommendations
- Amount of Containers
- Flow Viz
- Loading Configurations
https://www.globalsecurity.org/military/library/policy/army/fm/55-20/ch8.htm
Proposed Future Work
• Addition of Drag Reduction Devices
https://www.rms.nsw.gov.au/documents/about/envi
ronment/air/case-study-vortex-generators-road-
trains.pdf
http://www.stemco.com/product/trailertail/
Questions?