Hub connecting structure of forward propeller and rear propeller of contrarotating propeller

Abstract

The invention relates to a hub connecting structure of a front propeller and a rear propeller of a contrarotating propeller. The hub connecting structure comprises the front propeller and the rear propeller which are co-axially arranged, wherein the front propeller is driven by an internal combustion turbine or a motor in a ship body; the rear propeller is driven by a motor nacelle arranged at the tail of the rear propeller; the front propeller comprises front propeller blades, a front propeller hub and a front propeller fairing; the rear propeller comprises a rear propeller hub and rear propeller blades; the cross sections of the rear propeller hub, the front propeller fairing and the front propeller hub are circular; the busbar of the rear propeller hub and the front propeller fairing is a coherent sine curve segment, wherein the diameter of the rear propeller hub is larger than that of the front propeller fairing; tangent lines at the head end and the tail end of the curve segment of the sine curve segment are parallel to the axis of the propeller. When a main engine for driving the front propeller operates, the front propeller blades and the front propeller fairing are driven to rotate by the front propeller hub, the front propeller blades generate thrust, so as to push backwards to generate a rotating wake flow, the flow proximity to the front propeller hub flows to the rear propeller hub in the manner of being attached to the front propeller fairing; when an electric motor for driving the rear propeller operates, the rear propeller blades rotate to recover the rotating wake flow of the front propeller, so that energy is recovered and the incoming flow of the front propeller fairing can smoothly flow through.

Description

technical field [0001] The invention relates to a connecting structure for a front and rear propeller hub of a counter-rotating propeller, which belongs to the technical field of ship design. Background technique [0002] There are many types of counter-rotating propellers. Among them, for propellers driven independently by the front and rear propellers, the front propeller is usually driven by a gas turbine (or motor) inside the hull to drive the front propeller to rotate; the rear propeller usually adopts a pod-type electric propulsion type. From the perspective of energy-saving principles, the type of counter-rotating propeller mainly adopts the reverse rotation of the rear propeller and the front propeller, so as to recover the energy in the wake vortex of the front propeller and achieve the effect of energy saving. However, the consideration of the hub vortex loss in the existing counter-rotating propellers is not sufficient, and the connection type of the hub and cap h...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is: the consideration of the hub vortex loss in the existing counter-rotating propeller type is not sufficient, and the connection type of the hub and spinner cap has not been optimized, which will generate a large amount of vortex, which will cause energy loss, and cannot fully Give full play to the energy-saving effect of counter-rotating propellers

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