WO2010082865A1

WO2010082865A1 - Cumulative propeller

Info

Publication number: WO2010082865A1
Application number: PCT/RU2009/000695
Authority: WO
Inventors: Александр Васильевич ТУГОВ
Original assignee: Tugov Aleksandr Vasilyevich
Priority date: 2009-01-19
Filing date: 2009-12-17
Publication date: 2010-07-22
Also published as: RU2009101605A; RU2405713C2

Abstract

The invention can be used as a propelling device, for ships, submarines and aircraft, and airboats and hovercraft, and makes it possible to more effectively use the applicable power, reduce vibration and noise and also to increase the technological effectiveness of the propelling device. As indicated on figure 1 and figure 2, this is achieved in that the propeller, which is in the form of a cone, is composed of rows of concave blades which are oriented in rows in the direction of rotation and are delimited and secured by concave shells; the apex of the propeller is a hub. As the propeller rotates, it creates a dense and relatively homogeneous flow of water which is focused along the axis of rotation of said propeller, is directed in the opposite direction to the movement of the vessel and has a smaller degree of turbulence therein and loses less pressure in front of the vessel, which increases the coefficient of efficiency and reduces vibration and noise. A robust construction of concave blades and concave shells makes it possible for the propeller to be formed from a sheet-like, alloyed rolled stock which is thin relative to the dimensions thereof and without profiling of said blades and shells in width and length. This makes it possible to produce said propeller on series metal-working and welding equipment, which increases the technological effectiveness of said propeller. The construction also makes it possible to form the propeller from composite materials. The number of rows of blades, the number of blades in a row and the angle of incidence thereof, and the angular, linear and radial dimensions of the propeller and the elements thereof are determined by the output power and speed at the output shaft. The aerodynamics of the cumulative propeller are similar to the hydrodynamics thereof.

Description

CUMULATIVE EFFECT SCREW

FIELD OF THE INVENTION The invention relates to shipbuilding, aircraft building, construction of airboats, and air-cushion ships, and relates to the construction of propellers and propellers in ring nozzles.

BACKGROUND OF THE INVENTION A “thruster” RU 2 161 106 Cl is known in which the propeller is located in the plane of the inlet section of the nozzle and the nozzle is made in the form of a funnel with smooth transitions from the funnel cone to its tube. Also known is a "ship propeller in a nozzle" SU 1041027 A, comprising a hub and blades, rigidly connected by external ends with an annular nozzle having an internal taper, and made with a constant section along the length of the blade in the form of a wing profile. The last one is the closest prototype. The disadvantage of this screw is:

- high vacuum between the propeller and the stern of the vessel, - low cavitation characteristics, as a result of pronounced centrifugal flows created by the blades, and a large angle of their reflection along the axis of rotation of the screw, the need for profiling of the blades to reduce the resistance created by their thickness, necessary to ensure the strength of the screw .

The aim of the invention is to increase the efficiency of the screw, reducing cavitation, vibration and noise, as well as improving the manufacturability of its production. This is achieved by the fact that the screw is made in the form of a cone composed of rows of concave blades directed in each row in the direction of rotation, delimited and secured by concave shells; the top of the cone is the hub. By rotating, the screw creates a dense, relatively uniform and sharply directed along the axis of its rotation water flow, opposite to the movement of the vessel, with less turbulence in it and with less discharge in front of the vessel, which increases the efficiency, reduces vibration and noise.

Industrial applicability

The sturdy construction of concave blades and concave shells allows the screw to be made of thin, relative to its size, sheet alloy steel, without profiling them in width and length. This makes it possible to produce it on serial metalworking and welding equipment, which increases its manufacturability. The design also allows the screw to be made of composite materials. Brief Description of the Drawing

Fig. 1 shows a general view of a screw with a segment cut; in fig. 2 type of screw from the stern.

The screw consists of a hub 1, blades 2 and shells 3.

SUMMARY OF THE INVENTION The device operates as follows. When the hub of the screw 1 rotates, the blades 2 attached to it, forming a cone, delimited and fixed by the shells 3, capture water. The blades located on the first row from the hub are directed towards the rotation of the screw. Due to this focus created reflected parts of the flow adjacent to each other, descending along the trailing edges of these blades, have a relatively small difference in speeds. This reduces the turbulence of the flow from the back of the blade, which reduces the energy consumption for resistance when it is created. The created aggregate flow smoothly moves inside the propeller cone in the direction opposite to the vessel motion. The inner part of the stream closes behind the hub. The outer part of the flow due to the concavity of the shell smoothly goes to the center. A similar process takes place in the next rows of blades, but due to the larger diameter, and, accordingly, higher linear speeds, higher density flows are formed and directed, which condense the previous ones towards the center, which contributes to a greater directivity of the general flow along the axis of rotation and its acceleration. Water is drawn along a conical surface formed by rows of blades, the area of which is greater than the area of the outlet section at the base of the propeller, which further increases the flow rate created by the propeller, due to the same design feature, the pressure between the propeller and the stern of the vessel decreases. The blades directed in the direction of rotation, relatively short and narrow, spaced in the space of the cone, make the flow relatively uniform and help to reduce vibration and noise. The number of rows of blades, the number of blades in a row and their angle of attack, linear and radius dimensions of the screw and its elements are determined by the output power and speed on the output shaft. The aerodynamics of a cumulative propeller is similar to its hydrodynamics.

Claims

CLAIM

Cumulative screw, characterized in that it is made in the form of a cone composed of rows of concave blades directed in rows in the direction of rotation, delimited and secured by concave shells; the top of the cone is the hub. The number of rows of blades, the number of blades in a row and their angle of attack, angular, linear and radius sizes of the screw and its elements are determined by the output power and speed on the output shaft.