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A preliminary investigation of the drag and ventilation characteristics of livestock haulers
| 题名： | A preliminary investigation of the drag and ventilation characteristics of livestock haulers |
| 作者： | Hoffman, J. A.; Sandin, D. R. |
| 关键词： | characteristics；invest；esto；relim；stig；lation；live；mina；velocity；mathematical |
| 摘要： | A wind tunnel evaluation of the drag and ventilation characteristics of a conventional (unmodified) and five modified subscale model livestock haulers at 0 deg yaw angle has been made. The unmodified livestock hauler has a relatively high drag coefficient, and a low velocity recirculation region exists in the forward portion of the hauler. The use of a streamlined forebody and enclosed gap reduced the drag coefficient of one model by 42%and improved the rate at which contaminants can be flushed from the cargo compartment by a factor of 2.5. From the limited data obtained, any increase in the fraction of open area of the trailer sides was found to improve the trailer ventilation. The use of a ram air inlet can improve the ventilation within the hauler and remove the low velocity recirculation region at the expense of a modest increase in the truck's drag coefficient. A mathematical model for vehicles with ram air or NACA submerged inlets was developed and appears to adequately predict the ventilation characteristics of livestock haulers. |
| 报告类型： | 科技报告 |
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