CN111156866B

CN111156866B - High-speed entry navigation body second grade head form

Info

Publication number: CN111156866B
Application number: CN201911377125.5A
Authority: CN
Inventors: 宋乃孟; 刘平安; 刘晗聪; 丁涛; 王璐
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2022-12-13
Anticipated expiration: 2039-12-27
Also published as: CN111156866A

Abstract

The invention discloses a second-stage head type of a high-speed underwater vehicle, which relates to the technical field of underwater propelling devices and mainly comprises a first-stage head and a second-stage head, wherein the angle of the first-stage head is 60 degrees, the angle of the second-stage head is 60 degrees, a cylindrical transition section is arranged between the first-stage head and the second-stage head, and a cylindrical projectile body is arranged behind the second-stage head. The two-stage head type of the high-speed water-entering navigation body adopts the two-stage head, so that the contact area between the head and the water of the projectile body is reduced, and the friction force from the water when the projectile body moves in the water at a high speed is effectively reduced. When the projectile body moves at a high speed underwater, the primary head of the projectile body is contacted with water to generate vacuoles, the wall surface of each vacuole can cross the secondary head and wrap the projectile body, and the resistance from the head is greatly reduced.

Description

High-speed entry navigation body second grade head form

Technical Field

The invention relates to the technical field of underwater propelling devices, in particular to a high-speed underwater vehicle two-stage head type.

Background

Whether the rapid delivery of the supercavity projectile or the marine communication equipment is carried out, the test of the water entering process is carried out, the projectile or the delivery vehicle is guaranteed not to be damaged in the water entering process, the striking task or the communication task can be smoothly completed, and people are forced to continuously increase the knowledge of the water entering process of a navigation body. The water inlet process starts from the moment that the head of the moving body touches the free water surface, a disturbance which enables the water area to flow is generated in the water area near the touch point, the disturbance is rapidly spread to the periphery in the water area, and the moving body enters the water area to reach a stable state along with the time to complete the water inlet process. The water inlet process is a very short transient process, but the short process plays an extremely important role in the whole motion process of the moving body, and determines whether the moving body can stably enter water from air or not to a great extent. For example, in 1930, the trial production of MK31 air-drop torpedoes in the United states is successful, and in the subsequent actual combat, more than half of torpedoes have problems of diving when entering water or trajectory instability after entering water, and the analysis shows that: the reason is that the influence of the generation of water-entering vacuoles on the hydrodynamics in the water-entering process is not clear enough. The water inlet process is subjected to complex phenomena of sudden change of a flowing medium, free liquid level and the like in a very short time, and simultaneously the interaction of a moving body, air and water is involved. The navigation body can form vacuole when entering water, the vacuole wraps the navigation body, so that partial area of the navigation body can be prevented from being in direct contact with water, and the head of the navigation body is reasonably designed to reduce the resistance received by the navigation body when entering water.

Disclosure of Invention

In order to solve the technical problems, the invention provides a two-stage head shape of a high-speed water inlet navigation body, which is applied to the head shape of the high-speed water inlet navigation body.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a high-speed water-entering navigation body secondary head type, which comprises a primary head and a secondary head, wherein the primary head is arranged at the top of the secondary head.

Optionally, the primary header comprises a primary header vertex angle.

Optionally, the vertex angle of the primary head is a cone, and the vertex angle of the cone is 60 °.

Optionally, a transition section is arranged between the primary head and the secondary head.

Optionally, the transition section is cylindrical.

Optionally, the diameter of the transition section is the same as the diameter of the base of the cone.

Optionally, the secondary head is in a shape of a circular truncated cone, and an included angle of a side extension line of the circular truncated cone is 60 °.

Optionally, an elastic body is arranged at one end of the secondary head part different from the primary head part.

Optionally, the projectile body is cylindrical.

Compared with the prior art, the invention has the following technical effects:

the second-stage head type of the high-speed water-entering navigation body mainly comprises a first-stage head and a second-stage head, wherein the angle of the first-stage head is 60 degrees, the angle of the second-stage head is 60 degrees, a cylindrical transition section is arranged between the first-stage head and the second-stage head, and a cylindrical projectile body is arranged behind the second-stage head. The two-stage head type of the high-speed water entering navigation body adopts the two-stage head, so that the contact area of the head and the projectile body with water is reduced, and the friction force from the water when the projectile body moves at high speed in the water is effectively reduced. When the projectile body moves at a high speed underwater, the primary head of the projectile body is contacted with water to generate vacuoles, the wall surface of each vacuole can cross the secondary head and wrap the projectile body, and the resistance from the head is greatly reduced.

Drawings

FIG. 1 is a schematic structural diagram of a two-stage head of a high-speed water-entering navigation body according to the present invention.

Description of reference numerals: 1. a first-level head vertex angle; 2. a primary head; 3. a transition section; 4. a secondary head; 5. a body of elastomer; 6. carrying out cavitation; 7. and (3) water.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1, the embodiment provides a second-level head type of a high-speed water-entering navigation body, which comprises a first-level head 2, a transition section 3, a second-level head 4 and a projectile body 5 which are arranged in sequence from front to back,

in this embodiment, the primary head 2 comprises a conical primary head apex angle 1, the cone apex angle being 60 °. The transition section 3 is cylindrical. The diameter of the transition section 3 is the same as the diameter of the base of the cone. The secondary head part 4 is in a circular truncated cone shape, and the included angle of the extended lines of the side edges of the circular truncated cone shape is 60 degrees. The projectile body 5 is cylindrical.

The first-level head 2 of the navigation body collides with the water 7, and the pointed-nail-shaped spray moves backwards relative to the navigation body along the wall surface of the first-level head 2; the water 7 flows through the primary head 2 of the navigation body, and a cavity 6 is formed between the tail end of the primary head 2 and the cylindrical surface of the transition section 3 behind the primary head; the underwater penetration depth of the navigation body is increased continuously, splashed water splash slightly collides with the secondary head 4 of the navigation body, but the whole body exceeds the secondary head 4, and the water splash continuously moves backwards relative to the navigation body; the underwater penetration depth of the navigation body is further deepened, the area of the vacuole 6 formed behind the first-level head 2 gradually wraps the projectile body 5 behind the second-level head 4 of the navigation body, and the second-level head 4 and the projectile body 5 of the navigation body do not directly interact with water 7, so that the contact area between the head and the projectile body 5 and the water 7 is reduced, and the friction force from the water 7 when the projectile body 5 moves at high speed in the water 7 is effectively reduced.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

In summary, the following steps: the invention discloses a high-speed underwater vehicle secondary head type, which relates to the technical field of underwater propulsion devices and mainly comprises a primary head and a secondary head, wherein the angle of the primary head is 60 degrees, the angle of the secondary head is 60 degrees, a cylindrical transition section is arranged between the primary head and the secondary head, and a cylindrical projectile body is arranged behind the secondary head. The two-stage head type of the high-speed water-entering navigation body adopts the two-stage head, so that the contact area between the head and the water of the projectile body is reduced, and the friction force from the water when the projectile body moves in the water at a high speed is effectively reduced. When the projectile body moves at a high speed underwater, the primary head of the projectile body is contacted with water to generate vacuoles, the wall surface of each vacuole can cross the secondary head and wrap the projectile body, and the resistance from the head is greatly reduced.

Claims

1. A high-speed underwater vehicle secondary head is characterized by comprising a primary head and a secondary head, wherein the primary head is arranged at the top of the secondary head, and an elastic body is arranged at one end of the secondary head, which is different from the primary head;

the primary head comprises a primary head vertex angle;

the vertex angle of the primary head part is a cone; the vertex angle of the cone is 60 degrees;

the secondary head is in a circular truncated cone shape, and the included angle of the extended lines of the side edges of the circular truncated cone shape is 60 degrees;

a transition section is arranged between the first-stage head part and the second-stage head part;

the transition section is cylindrical; the circular truncated cone gradually increases from the transition section to the projectile body and is connected with the projectile body;

the diameter of the transition section is the same as the diameter of the bottom surface of the cone.

2. The high speed entry vehicle secondary head form of claim 1, wherein the projectile body is cylindrical.