Abstract
Mean wind forces and peak pressure acting on wind turbine nacelles are investigated by the wind tunnel tests and empirical formulae for their coefficients are proposed. The mean drag coefficient in GL Guideline 2003 seems to be conservative than proposed values, however, peak pressure coefficients recommended in the guideline appears to be considerably underestimated compared with values obtained from the wind tunnel tests. The distributions of negative peak pressure coefficients on the wind turbine nacelles are similar to those on the corresponding building roofs, but values are larger than those in the current building codes, such as Eurocode, ASCE and AIJ.
