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Natural Wind Influence on Fuel Consumption for Highway Heavy Trucks (Part 2)
Published May 19, 2010 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
The quartered mean wind directions in the real wind model which was previously applied to (a) flat body (vacant) of heavy trucks by us is here similarly applied to (b) flat body with freights and (c) box body of heavy trucks (80 km/h (22.2 m/s)) to obtain the short-term wind influence on fuel consumption (WIF), βfi, for the mean head wind (i=1, ⎟θ⎟≺45°), the mean side wind (i=2 and 4, 45°≺⎟θ⎟≺135°) and the mean tail wind (i=3, ⎟θ⎟≻135°) where θ denotes wind direction, after the wind tunnel data of aerodynamic drag coefficient, CD to yaw angles obtained by Naysmith (1982) are wholly referenced and studied for approximations of yaw property, rcd for each body. It is shown that the (c) box body trucks have larger WIF of 14-23%, or the larger fuel loss due to the natural winds of head winds as well as side winds of 3 m/s.