Aerodynamic drag analysis of double-deck container vehicles with different structures |
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Authors: | LI Yan-fei TIAN Hong-qi YANG Ming-zhi Key Laboratory of Traffic Safety on Track Ministry of Education Central South University Changsha China School of Traffic Transportation Engineering |
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Affiliation: | LI Yan-fei1,2,TIAN Hong-qi1,YANG Ming-zhi1,2 1.Key Laboratory of Traffic Safety on Track,Ministry of Education,Central South University,Changsha 410075,China,2.School of Traffic and Transportation Engineering |
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Abstract: | To study the aerodynamic performance of a new six-axis X2K double-deck container vehicle, numerical simulation was done based
on three-dimensional, steady Navier-Stokes equations and k-? turbulence model. The results show that the pressure on the front surface of vehicle is positive, and others are negative.
The maximum negative one appears as a “gate” shape on front surfaces. The pressure on vehicle increases with train speed,
and pressure on vehicles with cross-loaded structure is smaller than that without it. The airflow around vehicles is symmetrical
about train vertical axis, and the flow velocity decreases gradually along the axis to ground. Airflow around vehicles with
cross-loaded structure is weaker than that without the structure. The aerodynamic drag increases linearly with the train speed,
and it is minimum for the mid-vehicle. The linear coefficient for mid-vehicle without cross-loaded structure is 29.75, nearly
one time larger than that with the structure valued as 15.425. So, from the view-point of aerodynamic drag, the cross-loaded
structure is more reasonable for the six-axis X2K double-deck container vehicle. |
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Keywords: | six-axis X2K double-deck container vehicle loading form aerodynamic drag numerical simulation |
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