Aerodynamic drag
Abstract
This chapter considers the aerodynamic drag of trains. It begins by considering the need for information on aerodynamic drag in its wider context so that overall resistance can be calculated for the determination of power requirements and energy usage. The basic Davis equation, which includes both aerodynamic and mechanical resistance components, is introduced. Approximate breakdowns of the aerodynamic drag associated with different parts of the train are given, and the importance of friction and underbody drag is emphasised. Methods for the determination of aerodynamic drag are then discussed. The full-scale methodology is based on the use of coasting tests, where trains coast without power from high speeds to ...
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