A discrete marine propulsion system

Abstract

The application relates to the ship technology field and discloses a discrete ship propulsion system, which comprises a plurality of propellers, a ship body and a propulsion control unit. The application is based on the active flow field propulsion principle. When the ship is in the sailing stage, the plurality of propellers located on the two sides of the ship establish a continuous controllable active flow field on the two sides of the ship through cooperative operation, the rear flow field empties the forward fluid of the bow of the ship, and the wave-making resistance of the ship in the sailing process due to the bow line type is avoided or reduced. When one propeller is arranged on each side of the bow, the reverse flow field flow rate established by the propeller is greater than or equal to the equivalent displacement flow rate in the forward process of the ship. Because the equivalent displacement flow rate generated by the bow in the sailing process of the ship is less than or equal to or close to the flow rate of the reverse flow field on the two sides of the bow, the sailing wave-making resistance of the ship can be greatly reduced or eliminated, and the sailing energy consumption of the ship is reduced.

Description

Technical Field

[0001] This invention relates to the field of marine equipment technology, and in particular to a high-efficiency propulsion technology for ship navigation, applicable to low-energy propulsion of ships. Background Technology

[0002] Shipping is currently the mainstream mode of transporting goods and people internationally. The transportation cost of ships is linearly related to the ship's sailing resistance. In particular, the energy consumption generated by the wave-making resistance of ships is the main energy consumption of ships. How to reduce or eliminate the wave-making resistance of ships has always been an important research topic in ship design.

[0003] How to utilize novel fluid theory models to optimize wave-making resistance and improve operational economy while ensuring safe and reliable navigation, in conjunction with modern technological solutions, has become one of the core technical points in the development of a new generation of energy-saving passenger and cargo ships. Summary of the Invention

[0004] The technical problem this invention aims to solve is that the wave-making resistance of a ship directly affects its energy consumption, as well as several other indicators such as the economic efficiency of ship operation and the efficiency of ship energy use. To address the aforementioned technical problems, this invention provides a discrete ship propulsion system, comprising multiple propellers, a hull, and a propulsion control unit. Based on the principle of active flow field hydrodynamics, when a ship enters the navigation phase, a traditional stern propulsion system requires the bow to push aside the water flow directly in front of it. Pushing aside the water flow in front of the bow requires energy to generate waves. The discrete propulsion system, through the coordinated operation of multiple propellers located in the water on both sides of the ship, uses the water flow in front of the bow as the propulsion medium, drawing it along the outside of the hull towards the stern, forming an active flow field. The flow rate per unit time of the active flow field is similar to the unit displacement flow rate of the ship's propulsion. The active flow field formed by the coordinated operation of the propellers can eliminate or reduce the waves generated by pushing aside the water flow in front of the bow during navigation, thus reducing the energy consumption of wave generation during ship navigation.

[0005] Its characteristic feature is that the ship propulsion system consists of multiple relatively independent propulsion units, arranged on both sides of the ship according to the active flow field direction of the hull structure.

[0006] Its characteristic is that when multiple propellers work together, an active flow field from bow to stern is established on both sides of the ship, clearing or reducing the water in front of the bow during the ship's navigation, thereby reducing or eliminating the wave-making resistance generated by the bow during the ship's navigation.

[0007] Its characteristic is that when multiple propellers on both sides of the ship are working, the flow field flow rate is adjusted by controlling the propeller speed through the propulsion control unit. The optimal flow field flow rate from the bow to the stern is approximately equal to the ship's forward displacement flow rate during navigation.

[0008] Its characteristic feature is that multiple thrusters within the propulsion system generate propulsion for the ship by establishing a reverse flow field.

[0009] Its characteristic is that if one or more thrusters in the propulsion system malfunction, it will not affect the safety of the ship's propulsion system, but will only appropriately reduce the ship's propulsion efficiency and propulsion capacity.

[0010] Compared with the prior art, the discrete ship propulsion system of this invention has the following advantages: This invention provides a discrete ship propulsion system based on the principle of hydrodynamics. When a ship enters the navigation phase, a traditional stern propulsion system requires the bow to push aside the water flow directly in front of it. Pushing aside the water flow requires energy to create waves. The discrete propulsion system, through the coordinated operation of multiple propellers located in the water on both sides of the ship, uses the water flow at the bow as the propulsion medium, drawing it from the outside of the hull towards the stern, forming an active flow field. The flow rate per unit time of this active flow field is similar to the unit displacement flow rate of the ship's propulsion. The active flow field formed by the coordinated operation of the propellers can eliminate or reduce the waves created by pushing aside the water flow in front of the bow during navigation, thus reducing wave-making energy consumption. Wave-making energy consumption accounts for 20-80% of the total energy consumption of a traditional ship, and this proportion increases significantly with higher ship speeds. The discrete propulsion system can significantly reduce wave-making energy consumption, achieving a reduction in overall ship navigation energy consumption. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present invention; Figure 2 yes Figure 1 Enlarged view of a portion; Detailed Implementation

[0012] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0013] First, it should be noted that the directions such as top, bottom, upward, and downward mentioned in this article are defined relative to the directions in the various accompanying figures. They are relative concepts and therefore can change depending on their different positions and practical applications. Therefore, these or other directions should not be interpreted as restrictive terms.

[0014] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude the plural.

[0015] Furthermore, it should be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the accompanying drawings, can still be combined among these technical features (or their equivalents) to obtain other embodiments of this application not directly mentioned herein.

[0016] It should also be understood that while the terms "first," "second," etc., are used in this document to describe various types of information, this information should not be limited to these terms, which are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0017] It should be noted that in different figures, the same reference numerals denote the same or substantially the same components.

[0018] like Figures 1-2 As shown in the preferred embodiment of the present invention, a discrete ship propulsion system includes: a hull 1, propellers 2, and a propulsion control unit 3. The discrete propulsion system comprises multiple relatively independent propellers 2, which are arranged in the water on both sides of the hull 1 according to the specific hull structure. Each propeller 2 is driven by an independent propulsion controller 3. The propellers 2 work together to establish an active flow field 4 on both sides of the hull 1, flowing from bow to stern.

[0019] When a ship enters the navigation phase, a traditional stern propulsion system requires the bow to push aside the water flow directly in front of it. Pushing aside the water flow in front of the bow requires energy to generate waves. A discrete propulsion system, through the coordinated operation of multiple thrusters 2 located in the water on both sides of the ship, uses the water flow in front of the bow as the propulsion medium, drawing it along the outside of the hull towards the stern, forming an active flow field 4. The flow rate per unit time of this active flow field is similar to the unit displacement flow rate of the ship's propulsion. The active flow field 4 formed by the coordinated operation of the thrusters 2 can eliminate or reduce the waves generated by pushing aside the water flow in front of the bow during navigation, thus reducing the energy consumption of the hull 1 for wave generation.

[0020] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A discrete ship propulsion system, characterized in that, include: Multiple thrusters, hull, and propulsion control unit; the multiple thrusters are symmetrically arranged on both sides of the hull; Each thruster is controlled by an independent propulsion control unit, and the multiple thrusters work together to provide propulsion for the ship. The discrete propulsion system works together with multiple thrusters on both sides to guide the water flow at the bow of the ship through the thrusters to the stern of the ship, forming a local propulsion flow field and reducing or eliminating the wave-making resistance of the ship. The flow field flow rate L1 established by the discrete propulsion system is approximately equal to the equivalent hull displacement flow rate L2 during the ship's forward navigation.

2. The discrete ship propulsion system according to claim 1, characterized in that, The system comprises multiple relatively independent propellers, which are symmetrically distributed in the water on both sides of the hull according to the shape of the hull structure.

3. The discrete ship propulsion system according to claim 1, characterized in that... When multiple thrusters work together, they create an active flow field from bow to stern on both sides of the ship. This active flow field clears or reduces the water in front of the bow during the ship's navigation, thereby reducing or eliminating wave-making resistance generated at the bow.

4. The discrete ship propulsion system according to claim 1, characterized in that, When the multiple propellers on both sides of the ship are working, the flow field is adjusted by controlling the propeller speed through the propulsion control unit. The optimal flow field from the bow to the stern is approximately equal to the forward displacement flow of the ship during navigation.

5. The discrete ship propulsion system according to claim 1, characterized in that, The failure of one or more thrusters in the propulsion system will not affect the safety of the ship's propulsion system, but will only appropriately reduce the ship's propulsion efficiency and propulsion capacity.

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