Comment on " Simple Equations for Helical Vortex Wakes"

摘要: W OOD has presented a formulation for the efficiency of propeller or rotor that an infinite number blades or, equivalently, is represented by actuator disc, based, respectively, on simple vortex and momentum theory. In this work, arbitrary "thermodynamic efficiency" introduced to account irreversible conversions energy viscosity which are said be omitted in "most 'aerodynamic' analyses." Long-established methods analysis" give 17, blade element