CN110907131A - Free-launch hydrofoil experimental device - Google Patents
Free-launch hydrofoil experimental device Download PDFInfo
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- CN110907131A CN110907131A CN201911251024.3A CN201911251024A CN110907131A CN 110907131 A CN110907131 A CN 110907131A CN 201911251024 A CN201911251024 A CN 201911251024A CN 110907131 A CN110907131 A CN 110907131A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/08—Aerodynamic models
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Abstract
The embodiment of the invention relates to a free-launch hydrofoil experimental device, which comprises: the launching piece, the transverse wing, the connecting component and the hydrofoil component; the one end of launching element with the middle part of wing is connected, the both ends of wing with coupling assembling connects, coupling assembling with the hydrofoil subassembly can be dismantled and connect, through coupling assembling makes the hydrofoil subassembly produces the lift of longitudinal symmetry at the navigation in-process, thereby guarantees freely launch hydrofoil experimental apparatus's stability. Therefore, the invention realizes the research on the cavitation flow around the hydrofoil under the boundary of the free surface through the vertically symmetrical hydrofoils, and can effectively solve the problem of the hydrofoil takeoff caused by poor stability of the device in the existing test.
Description
Technical Field
The embodiment of the invention relates to the field of marine ship engineering, in particular to a free-launch hydrofoil experimental device.
Background
In order to maintain the increasingly severe ocean interests of the situation, small, high-speed surface vehicles have gradually become an important component of the development of future ocean strategic systems. The new concept surface vehicle mainly uses hydrofoils and revolution bodies as underwater submerged body components, as shown in fig. 1, generates buoyancy or lift force to lift the hull, thereby achieving the effect of reducing wave-making resistance and viscous resistance. Then, when the underwater structure reaches the traveling speed of 40 knots (about 20m/s) or more, the water in the surface low-pressure area generally undergoes phase change to generate unstable-state-evolving cavitation bubbles, and the collapse of the falling cavitation bubbles can form local short-time high pressure on the surface of the structure, so that the instability of stress and load and even cavitation structure damage are induced, and the underwater structure is a restrictive problem of aircraft design.
When the immersion of the navigation body from the free surface reaches the same magnitude as the characteristic dimension (such as the diameter of the revolving body and the chord length of the hydrofoil), the influence of the free surface begins to appear. Along with the change of the immersion depth from large to small, the flow forms of the free surface and the vacuole mainly comprise the following types: (1) the free surface and the vacuole are separated from each other (as shown in figure 2), the free surface indirectly influences the shape of the vacuole and changes the falling shape of the vacuole and the local vacuole collapse strength; (2) the free surface is locally communicated with the vacuole and is closed again after a short time, gas above the free surface enters the vacuole through the communication area to form a local ventilation vacuole, and the evolution characteristic and the stability of the local ventilation vacuole are both the same as those of the original natural vacuole (as shown in figure 3); (3) the communication channel can be maintained for a long time, so that a stable ventilation supercavity is formed (as shown in figure 4).
Figures 2-4 show several types of free-surface cavitation in the vicinity of the solid of revolution (one: cloud-like cavitation separated from the free surface, two: local aeration cavitation, and three: aeration supercavity). At present, the research work on near-free surface cavity flow is mostly carried out on the basis of a revolving body, and the research on the cavity flow field structure and the dynamic characteristic of a near-free surface hydrofoil is relatively less. Therefore, the research on the unsteady flow characteristics of the hydrofoil cavitation under the free surface boundary has very important significance for the optimal design and parameter control of the hydrofoil lifting component of the surface craft.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, an embodiment of the present invention provides a free-launch hydrofoil experimental apparatus.
In a first aspect, there is provided a free-launch hydrofoil experimental apparatus, the apparatus comprising: the launching piece, the transverse wing, the connecting component and the hydrofoil component;
the one end of launching element with the middle part of wing is connected, the both ends of wing with coupling assembling connects, coupling assembling with the hydrofoil subassembly can be dismantled and connect, through coupling assembling makes the hydrofoil subassembly produces the lift of longitudinal symmetry at the navigation in-process, thereby guarantees freely launch hydrofoil experimental apparatus's stability.
In one possible embodiment, the launcher comprises a body and a connecting part located at one end of the body and used for connecting the wings;
the body is of a cylindrical structure, the middle section of the connecting portion is concave, a rectangular groove used for being matched with the cross wings in an inserting mode is formed in the connecting portion, and a plurality of symmetrical first threaded holes are formed in the rectangular groove along the connecting portion.
In a possible implementation manner, the other end of the body is used for being connected with a launching hole of a free-launching water tank, and the launching hole is used for providing kinetic energy for the free-launching hydrofoil experimental device.
In one possible embodiment, the length of the rectangular groove is the same as the length of the connecting part, and the width of the rectangular groove is 20 mm and the height of the rectangular groove is 8 mm.
In one possible embodiment, the middle section of the wing is of a diamond structure, and the angle of the upper inner angle of the middle section is greater than that of the lower inner angle, and the diamond structure is used for reducing the resistance of the free-launch hydrofoil experimental device in the sailing process;
and a second threaded hole coincident with the first threaded hole is further formed in the transverse wing, third threaded holes are symmetrically formed in two sides of the second threaded hole, and the thread direction of each third threaded hole is perpendicular to that of the second threaded hole.
In one possible embodiment, the connecting assembly comprises two connecting plates which are symmetrically arranged, the connecting plates are in an up-and-down symmetrical triangular structure, and the up-and-down symmetrical triangular structure is used for enabling the hydrofoil assembly to generate up-and-down symmetrical lifting force in the sailing process;
one end of the connecting plate is provided with a fourth threaded hole which is coincident with the third threaded hole on the cross wing, and two fifth threaded holes are respectively arranged at the upper vertex angle and the lower vertex angle of the connecting plate.
In a possible embodiment, the hydrofoil assembly comprises two symmetrically arranged hydrofoils, the hydrofoils are respectively arranged at the upper vertex angle and the lower vertex angle of the connecting plate, and the two sides of the hydrofoils are provided with sixth threaded holes which coincide with the fifth threaded holes.
In one possible embodiment, the angle of attack of the hydrofoil is determined by changing an included angle between a circle center connecting line of the fifth threaded hole at the upper vertex angle and a circle center connecting line of the fifth threaded hole at the lower vertex angle, so as to obtain the change of the angle of attack.
In a possible embodiment, the diameters of the first threaded hole and the second threaded hole are both 5 mm, the diameters of the third threaded hole and the fourth threaded hole are both 5 mm, and the diameters of the fifth threaded hole and the sixth threaded hole are both 4 mm.
In a possible embodiment, through holes for reducing the weight of the free-launch hydrofoil experimental device are further arranged at the upper vertex angle and the lower vertex angle of the connecting plate.
The free-launch hydrofoil experimental apparatus provided by the embodiment of the application has the following advantages:
according to the hydrofoil device, the hydrofoil device which is symmetrical up and down is used for researching flowing around the hydrofoil vacuole under the boundary of the free surface, and the problem that the hydrofoil takes off due to poor stability of the device in the existing test can be effectively solved. In addition, the angle of attack of the hydrofoil can be quantitatively and accurately controlled by changing the included angle of the center line of the through hole at the top end.
The embodiment of the application provides a free launch hydrofoil test device under free surface boundary, test device simple structure, compactness, easily dismantlement and removal, low in cost is suitable for experimental research such as free launch. Meanwhile, different test research models can be flexibly replaced, and the test device can provide reliable test data for the research of the unsteady state cavitation flow characteristics under the boundary of the free surface.
Drawings
FIG. 1 is a schematic illustration of a new concept surface vehicle provided by an embodiment of the present application;
FIG. 2 is a first type of free-surface cavitation proximate to a solid of revolution provided by an embodiment of the present application;
FIG. 3 is a second type of free-surface cavitation proximate to a solid of revolution provided by an embodiment of the present application;
FIG. 4 is a third type of free-surface cavitation proximate to a solid of revolution provided by an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a free-launch hydrofoil experimental apparatus provided in the embodiment of the present application;
FIG. 6 is a top view of a launching member of the free-launch hydrofoil experimental apparatus provided in the embodiments of the present application;
FIG. 7 is a side view of a launching member of the free-launch hydrofoil experimental apparatus provided in the embodiments of the present application;
FIG. 8 is a schematic structural diagram of a cross-wing in a free-launch hydrofoil experimental apparatus according to an embodiment of the present application;
FIG. 9 is a top view of a cross-piece in a free-launch hydrofoil experimental apparatus provided in an embodiment of the present application;
FIG. 10 is a side view of a wing in a free-launch hydrofoil experimental apparatus provided in an embodiment of the present application;
FIG. 11 is a schematic structural diagram of a connection plate in the free-launch hydrofoil experimental apparatus provided in the embodiment of the present application;
FIG. 12 is a side view of a connection plate in the free-launch hydrofoil experimental apparatus provided in the embodiments of the present application;
FIG. 13 is a side view of a hydrofoil in a free-launching hydrofoil experimental apparatus provided in an embodiment of the present application;
notation of the reference numerals: 1-emitter, 2-transverse wing, 3-connecting plate, 4-hydrofoil, 5-body, 6-connecting part, 7-rectangular groove, 8-first threaded hole, 9-second threaded hole, 10-third threaded hole, 11-fourth threaded hole, 12-fifth threaded hole, 13-through hole, 14-sixth threaded hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, technical methods 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 any creative effort, shall fall within the scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components in a certain posture, the motion situation, etc., and if the certain posture is changed, the directional indications are changed accordingly.
The embodiment of the present application provides a free-launch hydrofoil experimental apparatus, and fig. 5 is a schematic structural diagram of the free-launch hydrofoil experimental apparatus provided by the embodiment of the present application, as shown in fig. 5, the free-launch hydrofoil experimental apparatus includes: the launching piece 1, the transverse wing 2, the connecting component and the hydrofoil component. Wherein, the one end of launching part 1 is connected with the middle part of horizontal wing 2, and the both ends of horizontal wing 2 can be dismantled with coupling assembling and be connected, and coupling assembling can be dismantled with the hydrofoil subassembly and be connected.
In this embodiment, fig. 6 and 7 are a top view and a side view of the launching member in the free-launch hydrofoil experimental apparatus provided in the embodiment of the present application, respectively, and as shown in fig. 6 and 7, the launching member 1 includes a body 5 and a connecting portion 6 located at one end of the body and used for connecting the cross wings. The other end of the body 5 is used for being connected with a transmitting hole of the free-emission water tank, and the transmitting hole is used for providing kinetic energy for the free-emission hydrofoil experimental device, so that the free-emission hydrofoil experimental device can reach a preset navigational speed in a short time.
In this embodiment, the body 5 is a cylindrical structure, the middle section of the connecting portion 6 is concave, a rectangular groove 7 (refer to fig. 10) for being in plug-in fit with the wing is arranged on the connecting portion 6, the connecting portion 6 is provided with a plurality of symmetrical first threaded holes 8 along the rectangular groove 7, and the diameter of the first threaded holes 8 is 5 mm. As shown in fig. 7, the length of the rectangular groove is the same as that of the connecting portion, and the width of the rectangular groove 7 is 20 mm and the height thereof is 8 mm.
Fig. 8 and 9 are a schematic structural diagram and a top view of a cross-piece in a free-launch hydrofoil experimental apparatus provided in an embodiment of the present application. As shown in fig. 8 and 9, the middle section of the wing 2 is a diamond structure, and the angle of the upper inner angle of the middle section is greater than the angle of the lower inner angle, and the diamond structure is used for reducing the resistance of the free-launch hydrofoil experimental device during sailing.
In this embodiment, the wing 2 is provided with a second threaded hole 9 coinciding with the first threaded hole 8, and the diameter of the second threaded hole 9 is 5 mm. Third threaded holes 9 are symmetrically formed in two sides of the second threaded hole 9, and the thread direction of the third threaded holes 9 is perpendicular to the thread direction of the second threaded holes 8. The distance between the two third threaded holes is 12 mm, and the distance between the lower threaded hole and the vertex of the inner angle is 11 mm.
Fig. 11 and 12 are schematic structural diagrams and side views of a connection plate in a free-launch hydrofoil experimental apparatus provided in an embodiment of the present application. As shown in fig. 11 and 12, the connecting assembly includes two connecting plates 3 symmetrically disposed, and the connecting plates 3 are in a vertically symmetric triangular structure, in this embodiment, the hydrofoil assembly can generate vertically symmetric lift forces when navigating through the vertically symmetric triangular structure, so as to ensure the stability of the free-launch hydrofoil device when navigating, prevent the free-launch hydrofoil device from taking off, and further achieve the purpose of researching the interaction between the hydrofoil vacuole and the free surface.
In this embodiment, the one end of connecting plate 1 is equipped with the fourth screw hole 11 with third screw hole 10 coincides mutually on the horizontal wing 2, and the last apex angle of connecting plate 3 and lower apex angle punishment do not are equipped with two fifth screw holes 13, and in addition, the last apex angle of connecting plate 3 still is equipped with the through-hole that is used for reducing free-launch hydrofoil experimental apparatus gravity with lower apex angle department.
The diameter of the fifth threaded hole 12 is 4 mm, the included angle of the long side of the connecting plate 3 is 50 degrees, and the included angle of the short side of the connecting plate is 130 degrees.
Fig. 13 is a side view of a hydrofoil in the free-launch hydrofoil experimental apparatus provided in the embodiment of the present application, and as shown in fig. 13, the hydrofoil assembly includes two symmetrically disposed hydrofoils 4, the hydrofoil 4 is disposed at a top corner of the connecting plate 3, and both sides of the hydrofoil 4 are provided with sixth threaded holes coinciding with the fifth threaded holes, and the diameter of the sixth threaded holes is 4 mm.
In this embodiment, through changing the contained angle between the centre of a circle connecting wire of the fifth screw hole of top angle department and the centre of a circle connecting wire of the fifth screw hole of lower apex angle department, the angle of attack of control hydrofoil that can the ration be accurate to the realization is attacked the influence that the angle of attack changes.
In addition, different test research models can be flexibly replaced, and the test device can provide reliable test data for the research of the unsteady-state cavitation flow characteristics under the boundary of the free surface.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments described above as examples. It will be appreciated by those skilled in the art that various equivalent changes and modifications can be made without departing from the spirit and scope of the invention, and it is intended to cover all such modifications and alterations as fall within the true spirit and scope of the invention.
Claims (10)
1. A free-launch hydrofoil experimental apparatus, characterized by comprising: the launching piece, the transverse wing, the connecting component and the hydrofoil component;
the one end of launching element with the middle part of wing is connected, the both ends of wing with coupling assembling connects, coupling assembling with the hydrofoil subassembly can be dismantled and connect, through coupling assembling makes the hydrofoil subassembly produces the lift of longitudinal symmetry at the navigation in-process, thereby guarantees freely launch hydrofoil experimental apparatus's stability.
2. The device of claim 1, wherein the emitting member comprises a body and a connecting portion at one end of the body for connecting the wings;
the body is of a cylindrical structure, the middle section of the connecting portion is concave, a rectangular groove used for being matched with the cross wings in an inserting mode is formed in the connecting portion, and a plurality of symmetrical first threaded holes are formed in the rectangular groove along the connecting portion.
3. The device of claim 2, wherein the other end of the body is used for being connected with a launching hole of a free-launching water tank, and the launching hole is used for providing kinetic energy for the free-launching hydrofoil experimental device.
4. The device of claim 2, wherein the length of the rectangular groove is the same as the length of the connecting portion, and the width of the rectangular groove is 20 mm and the height of the rectangular groove is 8 mm.
5. The device of claim 2, wherein the middle section of the wing is a diamond structure, and the angle of the upper inner angle of the middle section is greater than that of the lower inner angle, and the diamond structure is used for reducing the drag of the free-launch hydrofoil experimental device during sailing;
and a second threaded hole coincident with the first threaded hole is further formed in the transverse wing, third threaded holes are symmetrically formed in two sides of the second threaded hole, and the thread direction of each third threaded hole is perpendicular to that of the second threaded hole.
6. The device as claimed in claim 5, wherein the connecting assembly comprises two symmetrically arranged connecting plates, the connecting plates are of an up-and-down symmetrical triangular structure, and the up-and-down symmetrical triangular structure is used for enabling the hydrofoil assembly to generate up-and-down symmetrical lifting force during sailing;
one end of the connecting plate is provided with a fourth threaded hole which is coincident with the third threaded hole on the cross wing, and two fifth threaded holes are respectively arranged at the upper vertex angle and the lower vertex angle of the connecting plate.
7. The device according to claim 6, wherein the hydrofoil assembly comprises two symmetrically arranged hydrofoils, the hydrofoils are respectively arranged at the upper vertex angle and the lower vertex angle of the connecting plate, and the two sides of the hydrofoils are provided with sixth threaded holes which are coincided with the fifth threaded holes.
8. The device according to claim 7, wherein the angle of attack of the hydrofoil is determined by changing the angle between the circle center connecting line of the fifth threaded hole at the upper apex angle and the circle center connecting line of the fifth threaded hole at the lower apex angle for obtaining the change of the angle of attack.
9. The device of claim 7, wherein the first and second threaded holes are each 5 mm in diameter, the third and fourth threaded holes are each 5 mm in diameter, and the fifth and sixth threaded holes are each 4 mm in diameter.
10. The device of claim 7, wherein the upper vertex angle and the lower vertex angle of the connecting plate are further provided with through holes for reducing the weight of the free-launch hydrofoil experimental device.
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| CN201911251024.3A CN110907131B (en) | 2019-12-09 | 2019-12-09 | Free-launch hydrofoil experimental device |
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| CN201911251024.3A CN110907131B (en) | 2019-12-09 | 2019-12-09 | Free-launch hydrofoil experimental device |
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Cited By (2)
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| CN114486596A (en) * | 2022-01-13 | 2022-05-13 | 中国科学院力学研究所 | Electromagnetic drive-based multidirectional high-speed small particle emitting device |
| CN116822404A (en) * | 2023-06-07 | 2023-09-29 | 华北电力大学 | Method, system and equipment for predicting collapse behavior of limited cavitation nearby symmetrical wing sections |
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