Impact assessment of new generation high-speed agricultural tractor aerodynamics on transportation fuel consumption and related phenomena

Abstract

New generation agricultural tractors contribute to transportation by increased travel speeds. There is not any available aerodynamic data on authentic agricultural tractor form. On-road transportation by tractors is between 8 to 30% of their operational time. In this work, two agricultural tractors are modelled via computational uid dynamics for nine different speeds to determine aerodynamic resistances.Corresponding speeds are 10 to 80 km/h with 10 km/h increments and additionally 5 km/h. Reynolds number changes between 1.6×10 5 and 2.98×10 6 . The characteristic lengths are taken as the square root of the streamwise projected area of the tractor geometries. Aerodynamic forces exerted on the tractors change between 3 N to 746 N. The calculated drag coe cients are found as independent from Reynolds number and are 0.6 and 0.78 for the two different types of driver compartments. Constant speed travel scenarios are analysed. The approximated aerodynamic related fuel consumptions for one-hour changes between 0.002 to 8.28 lt/s which correspond to 0.001 to 5.76 kg/s carbon emission. A potential improvement in decreasing aerodynamic resistance about 20% is discussed by spatial data. Since the conducted work is being regarded as the rst instance in the literature, it is estimated that several consecutive reports will be triggered.

Analysing the Response of a Dual-Flow Transmission (Hmcvt) for Wheeled Tractors According to Efficiency and Productivity Criteria

“…As agricultural tractors are used for a wide range of tasks in the agricultural sector, they are subject to performance and efficiency requirements. The implementation of the outlined requirements is primarily based on the operation of the tractor's transmission, which should provide greater tractive force in the case of technological work [4] and sufficient speed in the case of transport work [5].…”