Propeller (airscrew) whose boundary layer is influenced by the energy of the exhaust gas from the propulsion machine

摘要

The invention relates to devices for propellers having any desired number of blades, whose profile can be designed to be hollow internally. The basic idea is to produce a reduced pressure in this cavity by means of the exhaust-gas energy from the propulsion machine, and to maintain this reduced pressure which acts, via suitable perforations, to the boundary layer of the air which flows externally over the propeller blades.