Single theory of movers on the continuous flows. Short theory of concurrent-rotating propellers

Abstract

Concurrent-rotating propellers have second rotor wheel with higher productiveness compared to the first one, so the water-gas stream is injected (absorbed) through the channels between the blades of the first rotor wheel, which in this mode does not compress the water-gas flow, and functions as rotating guiding device only, which helps to obtain the sinusoidal characteristics of the axial velocity changes with providing zero acceleration of the water-gas flow at the input edges of the second rotor wheel blades which compresses the flow and produces thrust. Injection (absorption) of the water-gas flow through the channels between the blades of the first rotor wheel also promotes the swirling of the water-gas flow in the area B1-H and emergence of additional static pressures gradient, grad Pd, that pulls the flow into the bundle before and after the section B 1 -B 1 , while before the section B 1 -B 1 this additional gradient of static pressure facilitates further acceleration, and in a B 1 -B 2 section slows down the water-gas flow, providing its sinusoidal characteristics in the H-B 2 section. Thus, the sinusoidal characteristics of the change of the axial velocity of the water-gas flow in the H-B 2 section helps to eliminate the kinematic zone of rigid (elastic) impact in the section B 2 -B 2 , which enables to increase the turnover, and therefore the thrust of the second rotor wheel of the concurrent-rotating propellers at 200-300% compared to the turnover and thrust of the one-row propellers.