CN115042911A - Navigation body fluid structure for underwater high-speed navigation and model simulation method - Google Patents
Navigation body fluid structure for underwater high-speed navigation and model simulation method Download PDFInfo
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- CN115042911A CN115042911A CN202210850829.5A CN202210850829A CN115042911A CN 115042911 A CN115042911 A CN 115042911A CN 202210850829 A CN202210850829 A CN 202210850829A CN 115042911 A CN115042911 A CN 115042911A
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- 238000004088 simulation Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 13
- 210000001124 body fluid Anatomy 0.000 title claims abstract description 4
- 239000010839 body fluid Substances 0.000 title claims abstract description 4
- 210000003934 vacuole Anatomy 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000009736 wetting Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B79/00—Monitoring properties or operating parameters of vessels in operation
- B63B79/20—Monitoring properties or operating parameters of vessels in operation using models or simulation, e.g. statistical models or stochastic models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
- B63B2001/382—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes by making use of supercavitation, e.g. for underwater vehicles
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Fluid Mechanics (AREA)
- Probability & Statistics with Applications (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention provides a navigation body fluid structure for underwater high-speed navigation and a model simulation method, which comprises a cavitator, a double-cone section and a column section which are connected in sequence; the double-cone section comprises a front cone section and a rear cone section which are sequentially connected, the front cone section is connected with the cavitator, and the rear cone section is connected with the column section; the half cone angle of the front cone section is larger than the half cone angle of the given navigation body, and the half cone angle of the rear cone section is smaller than the half cone angle of the given navigation body. The improved double-cone navigation body avoids wetting beyond a vacuole range due to the backward movement of the shoulder, and improves the underwater navigation stability of the navigation body.
Description
Technical Field
The invention relates to the technical field of underwater navigation bodies, in particular to a fluid structure of a navigation body for underwater high-speed navigation and a model simulation method.
Background
The conventional underwater high-speed navigation body is generally composed of a cavitator, a conical section and a column section, and in the high-speed navigation process of the underwater navigation body, the water between the navigation body and the water can generate cavitation phenomenon due to the high-speed relative motion of the navigation body and the water, so that cavitation bubbles are formed to wrap the navigation body, the resistance on the navigation body is reduced, and the navigation speed and the navigation range of the navigation body are improved. However, in some application scenarios, due to the large cavitation number, the cavitation bubbles generated by the navigation body cannot completely wrap the navigation body, and even can be partially closed at the cone section of the navigation body, so that the shoulder of the navigation body is wetted, and the stability of the navigation body is further affected.
Therefore, it is an urgent need to solve the problems of the art to provide a fluid structure and a model simulation method for a vehicle that can avoid wetting the shoulder and improve the stability of the vehicle.
Disclosure of Invention
In view of the above, the invention provides a novel underwater high-speed vehicle fluid structure, which changes the conventional single-cone column combination into a combination mode of a double-cone section and a column section, so as to ensure that the modified vehicle avoids the problem that the stability of the vehicle is affected by the wetting of the shoulder under the same application scene under the condition that the effective volume of the vehicle is not changed.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention first discloses a fluid structure of a navigation body for underwater high-speed navigation, which comprises: the cavitation device, the double-cone section and the column section are connected in sequence; the double-cone section comprises a front cone section and a rear cone section which are sequentially connected, the front cone section is connected with the cavitator, and the rear cone section is connected with the column section; the half cone angle of the front cone section is larger than the half cone angle of the given navigation body, and the half cone angle of the rear cone section is smaller than the half cone angle of the given navigation body.
Preferably, the diameter D of the cavitator n D is the column section diameter, 0.4D; the length-to-fineness ratio L/D of the navigation body is 17, and L is the length of the navigation body.
The invention also discloses a model simulation method of the fluid structure of the navigation body for underwater high-speed navigation, which comprises the following steps: according to an independent expansion principle, a LogVinovich vacuole model under a constant condition is constructed, and an expression of a vacuole form described by the vacuole model is as follows:
wherein x is the distance from the section of the cavitation bubble to the head cavitator, R c (x) Is the radius of the section of the cavitation at x, R n Is the radius of the cavitator, x 1 Indicates the position of the uniform cross section, x 1 ＝2R n ，R 1 ＝1.92R n ，R k Is the maximum radius of the cavitation, L k Is the cavitation length;
and selecting the navigation simulation working condition of the navigation body to simulate the navigation body according to the cavitation model.
Preferably, the maximum radius R of the cavitation bubbles k And length of cavitation bubbles L k The expression of (a) is:
wherein σ is the cavitation number, C x0 The cavitation resistance coefficient at a cavitation number of 0 is obtained by a large number of tests to be generally 0.82.
Preferably, the navigation simulation condition includes a navigation depth and a navigation speed of the navigation body.
Through the technical scheme, compared with the prior art, the invention has the beneficial effects that:
the improved double-cone-section navigation body avoids the wetting of the shoulder because the connecting part of the column section and the cone section, namely the shoulder, moves backwards and is not contacted with the vacuole edge, so that the stability of the navigation body is not influenced, and finally the effectiveness of the fluid shape design of the novel double-cone-section navigation body is explained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description in the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts;
FIG. 1 is a perspective view of a fluid structure of a vehicle for underwater high-speed navigation according to an embodiment of the present invention;
FIG. 2 is a side view of a fluid structure of a vehicle for underwater high-speed navigation according to an embodiment of the present invention;
FIG. 3 is a schematic fluid structure diagram of a prior art vehicle for high-speed underwater navigation according to an embodiment of the present invention;
fig. 4 is a simulation diagram of the relative position relationship between the two configurations of the vehicle and the cavity provided by the embodiment of the invention.
Detailed Description
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to the attached figure 3, the structure of a conventional underwater high-speed navigation body mainly comprises a cavitator 1, a conical section 20 and a column section 3, and is a single coneA structure in which the segments are joined to the column segments. Cavitator diameter D of conventional navigation body n D is the conventional column section diameter, the length-to-fineness ratio L/D of the conventional vehicle is 17, and L is the length of the conventional vehicle.
Under the condition of keeping the length, the diameter of the column section and the effective volume of the navigation body unchanged, the navigation body with the conventional configuration is improved, and the obtained navigation body with the double cone sections is shown as figures 1-2:
one aspect of the present invention provides a fluid structure of a navigation body for underwater high-speed navigation, comprising: the device comprises a cavitator 1, a double-cone section and a column section 3 which are connected in sequence; the double-cone section comprises a front cone section 21 and a rear cone section 22 which are sequentially connected, the front cone section 21 is connected with the cavitator 1, and the rear cone section 22 is connected with the column section 3; the half cone angle alpha of the front cone section 21 is larger than that of the conventional navigation body, and the half cone angle beta of the rear cone section 22 is smaller than that of the conventional navigation body, so that the shoulder of the improved navigation body is moved backwards by about 0.14L and is less prone to contact with water and wetting.
In one embodiment, the diameter D of the cavitator n D is the column section diameter, 0.4D; the length-to-thickness ratio L/D of the navigation body is 17, and L is the length of the navigation body.
The invention also provides a model simulation method of the fluid structure of the navigation body for underwater high-speed navigation, which comprises the following steps: according to an independent expansion principle, a Lobvivich vacuole model under a steady condition is constructed, and the expression of a vacuole form described by the vacuole model is as follows:
wherein x is the distance from the section of the cavitation bubble to the head cavitator, R c (x) Is the radius of the section of the cavitation at x, R n Is the radius of the cavitator, x 1 Indicates the position of the uniform cross section, x 1 ＝2R n ，R 1 ＝1.92R n ，R k Is the maximum radius of the cavitation, L k Is the cavitation length;
and according to the cavitation model, selecting a navigation simulation working condition of the navigation body to calculate the cavitation form of the navigation body, and describing the relative position relation between cavitation and the navigation body.
In one embodiment, the cavitation maximum radius R k And length of cavitation bubbles L k The expression of (c) is:
wherein σ is the cavitation number, C x0 The cavitation number is a cavitation device resistance coefficient at 0, and the value in this example is 0.82.
In one embodiment, the navigation simulation condition includes a navigation depth and a navigation speed of the navigation body. The simulation conditions of 5m navigation depth and 100m/s navigation speed can be selected to respectively simulate the navigation body with the conventional configuration and the navigation body with the double cone sections, and the obtained results are shown in FIG. 4. As can be seen from the figure, the shoulder of the navigation body with the conventional configuration penetrates through the cavity wall, is wetted when being contacted with water and can influence the navigation stability of the navigation body, and the improved double-cone navigation body is not contacted with the cavity due to the backward movement of the shoulder, so that the wetting is avoided, the stability of the navigation body is not influenced, and the effectiveness of the fluid appearance design of the novel double-cone navigation body is finally illustrated.
The fluid structure and the model simulation method of the underwater high-speed navigation vehicle provided by the invention are described in detail, the principle and the implementation mode of the invention are explained by applying a specific example in the embodiment, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined in this embodiment may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A fluid structure of a navigation body for underwater high-speed navigation, comprising: the cavitation device, the double-cone section and the column section are connected in sequence; the double-cone section comprises a front cone section and a rear cone section which are sequentially connected, the front cone section is connected with the cavitator, and the rear cone section is connected with the column section; the half cone angle of the front cone section is larger than the half cone angle of the given navigation body, and the half cone angle of the rear cone section is smaller than the half cone angle of the given navigation body.
2. The underwater high-speed sailing vehicle fluid structure of claim 1, characterized in that the diameter D of the cavitators n D is the column section diameter, 0.4D; the length-to-fineness ratio L/D of the navigation body is 17, and L is the length of the navigation body.
3. A method for simulating a fluid structure model of a navigation body navigating at a high speed underwater is characterized by comprising the following steps: according to an independent expansion principle, a LogVinovich vacuole model under a constant condition is constructed, and an expression of a vacuole form described by the vacuole model is as follows:
wherein x is the distance from the section of the cavitation bubble to the head cavitator, R c (x) Is the radius of the section of the cavitation at x, R n Radius of the cavitator, x 1 Indicates the position of the uniform cross section, x 1 ＝2R n ，R 1 ＝1.92R n ，R k Is the maximum radius of the cavitation, L k Is the cavitation length;
selecting a navigation simulation working condition of a navigation body to simulate the underwater navigation body fluid structure with high speed according to any one of claims 1-2 according to the cavitation model.
4. The method for simulating a fluid structure model of a vehicle sailing at high speed underwater according to claim 3, wherein the maximum radius R of the cavitation is k And length of cavitation bubbles L k The expression of (a) is:
wherein σ is the cavitation number, C x0 The drag coefficient of the cavitator is 0.
5. The method for simulating a fluid structure model of a navigation body navigating under water at a high speed according to claim 3, wherein the navigation simulation conditions comprise the navigation depth and the navigation speed of the navigation body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210850829.5A CN115042911A (en) | 2022-07-19 | 2022-07-19 | Navigation body fluid structure for underwater high-speed navigation and model simulation method |
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| CN202210850829.5A CN115042911A (en) | 2022-07-19 | 2022-07-19 | Navigation body fluid structure for underwater high-speed navigation and model simulation method |
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Cited By (1)
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| CN116911207A (en) * | 2023-06-14 | 2023-10-20 | 西安现代控制技术研究所 | Low aerodynamic resistance cone section combined shape design method and device considering volume |
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