Apart from Rolling resistance, the Aerodynamic Drag also represent the largest proportion of the overall resistance. It increases in the same way as that of Rolling resistance on movement of the vehicle and arises with increase in driving speed.
Drag Co-efficient:
The aerodynamic drag FL is depending on the following factors.
The aerodynamic drag FL is depending on the following factors.
- Speed of the vehicle V
- Size and shape of the vehicle and
- Air density ρ
The calculation for Drag co-efficient is as shown below.
FL = 0.5 . Cw . A . ρ .
FL = 0.5 . Cw . A . ρ .
The resistance that arises due to geometry of the vehicle is quantified by the Drag co-efficient (Cw).
The Aerodynamic drag can be controlled by the following measures.
1.Using fully panelled vehicle (Roof spoiler, front Apron and side panelling etc)
2.Aerodynamic shape and
3.Super structure with tightly roped Tarpaulin.
2.Aerodynamic shape and
3.Super structure with tightly roped Tarpaulin.
The Aerodynamic drag and Rolling resistance are each 33% for the commercial vehicles with an Engine out put of 301 KW (410 hp), a total weight of 40T and a driving speed of 80 km/h.
Source: Autobei
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