Channel tunnel aerodynamics - the relationship between British and French loss coefficients and analysis of Puymorens tunnel tests (IM-AERO-136)

For calculating train drag in the Channel Tunnel, the French use friction factors for BR Mk III and Corail stock which are 8E and 16% larger than the values used by the British. These discrepancies lead to major differences in the aerodynamic drag. This report represents an initial step...