Abstract
The newest technologies in the maritime field have gained a special dynamics over the last years. In particular it has been sought the improvement of the systems, procedures and rules related to environmental protection, but at the same time, lowering the fuel consumption has been targeted through various residual energy recovery methods, with an eye on lowering gas emissions in the atmosphere, in general, and CO2 in particular.This paper is aimed at just this target and it proposes a new controllable pitch propeller changing mechanism to be analysed, that would lead to lowering of energy consumption and by default to a reduction in the fuel consumption used by the diesel-generator.
Highlights
Any propulsion unit represents a system that transforms the mechanical energy of a certain movement into mechanical energy of a different movement
It is known that the ship propeller is characterized by propulsion yield, pitch distribution, blade shape, and blades’ positions related to the propeller’s axis and the cavitation phenomenon
Calculation of controllable pitch propeller mechanism is made in several stages provided that some technical details are known: the mechanism from the inside of propeller hub, hydraulic cylinder strengths, blocking differential mechanism strengths from the hydraulic pump, the clutch between shaft and differential mechanism and the propeller shaft
Summary
Any propulsion unit represents a system that transforms the mechanical energy of a certain movement into mechanical energy of a different movement. The ship propeller transforms the power installed on board ship into a thrusting force necessary to overcome the ship’s resistance to forward movement, ensuring it’s shifting with a certain imposed speed [3]. Specific to the ship propeller is the fact that it works in the ship’s wake, in an unevenly, turbulent fluid current, and the cavitation phenomenon imposes a certain specific geometry propeller, otherwise it would lead in yield loss [3,5]. It is known that the ship propeller is characterized by propulsion yield, pitch distribution, blade shape, and blades’ positions related to the propeller’s axis and the cavitation phenomenon. Calculation of controllable pitch propeller mechanism is made in several stages provided that some technical details are known: the mechanism from the inside of propeller hub, hydraulic cylinder strengths, blocking differential mechanism strengths from the hydraulic pump, the clutch between shaft and differential mechanism and the propeller shaft.
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