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Unformatted text preview: MORE FOR YOUR MONEY DRIVING YOUR BIG RIG FARTHER ON THE SAME TANK OF GAS Andrea Sydnor AAE 415 HOW DO YOU DO IT? Drag Reduction stay legal maintain flexibility Between cab and trailer above truck Between cab and trailer below truck End of trailer Three Problem Areas Stay Legal Trailer no longer than 48 ft Most are this long "Aerodynamic devices" not included Width no wider than102 in Other Considerations Maintain trailer capacity SAFETY for all people on the road! Current Projects Auburn University Gapless connection Limits maneuverability Limits flexibility Compromises safety Clarkson University Trailer extensions Legal ramifications? Limits flexibility Consumes Time Another Idea Target the lower cab air flow Maintains flexibility Maintains maneuverability Takes no extra time/effort No additional danger No size overall increase Goal Reduce CD by 10% Velocity = 55 mph = 80.6 ft/s Equal drag savings: model vs. reality Benefits Less stopping = more $ for drivers Less gasoline = more $ for company Up to 43% less gasoline @ 70 mph Reference: en-env.llnl.gov How? Trailer sub-panel Length? Position? Angle? Create model Model wake CMARC PMARC Manipulate model Model Excel Coordinates Tractor Trailer Scheme 2.5 2 height (y/c) 1.5 1 0.5 0 0 0.2 0.4 0.6 x/c 0.8 1 1.2 Model CMARC model Account for wheels Symmetric on y axis CDi from .out file PMARC model Model wake Find CD = .456 PMARC Results PMARC Results Modify Model Tractor Trailer Scheme 2.5 2 height (y/c) 1.5 1 0.5 0 0 0.2 0.4 0.6 x/c 0.8 1 1.2 Modified Model CMARC Adjust wake parameters Retool geometry PMARC Model wake CD = .054 Modified Model Modified Model Results Average Truck/Trailer CD = .5 Model CD = .556 Modified CD = .054 90% Savings @ 55 mph! Smaller subpanel More accurate model Limited by PMARC Thank you! ...
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