Uniform theory of movers on continuous flows. Brief theory of counter-rotating propellers

Abstract

The developed brief theory of the counter-rotating propellers is a logical chain of a series of articles relating to the development of the theory of one-row propellers, brief theory of counter-rotating propellers, brief theory of concurrent-rotating propellers, a comparative analysis of one-row, counter-rotating and concurrentrotating propellers in order to select the most effective variant. It is shown that counter-rotating propellers have high energy consumption and very low flight (traction) EF (efficiency factor), 35% and 7.5% respectively on the first and second rotor wheels. Therefore, the ultimate goal of a series of articles will be: to show and prove that among the one-row, counter-rotating and concurrent-rotating propellers the latter are the most efficient, as they allow to completely eliminate the main drawback of one-row and counter-rotating propellers associated with the kinematic zone of rigid (elastic) impact, Figure 1, section B 1 -B 1 , generating powerful impact waves in an oscillatory mode into environment. Another drawback of the counter-rotating propellers is the flow swirling after the first rotor wheel, regulating the counter flow swirling at the entry of the second counter-rotating rotor wheel, which in turn regulates the higher hydrodynamic load of the blades edges of the second counter-rotating rotor wheel and low speed compared to the first. Hence, the next article will cover the creation of the brief theory of concurrent-rotating propellers, which contains their full analysis