The aerodynamic characteristics of articulated tanker vehicles are sufficiently different from those of conventional box container vehicles to warrant separate investigation. The results from a programme of experimental studies using scale wind tunnel models are presented, investigating the ability of aerodynamic devices to reduce drag and spray when used on articulated tankers. The wind tunnel tests show that the tanker flow field is different from that for box container vehicles, particularly in the region of the tractor-trailer gap. Devices intended to control the flow in this region, and designed specifically for box containers, are not as effective on tanker vehicles. In particular, cab roof mounted fairings and tractor-trailer gap seals require modification to achieve comparable reductions in drag. Practical aerodynamic streamlining devices can reduce the drag of articulated tankers by about 22%. The dispersion of water spray generated by the tyres in wet weather was simulated using paraffin smoke. The technique is considered a useful first step prior to full scale trails. Devices that reduce the drag of articulated tankers did not appear to reduce the extent of spray dispersal from the vehicles.

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