CN111688891A - Open-loop active flow control device of underwater glider based on synthetic jet - Google Patents
Open-loop active flow control device of underwater glider based on synthetic jet Download PDFInfo
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- CN111688891A CN111688891A CN202010580925.3A CN202010580925A CN111688891A CN 111688891 A CN111688891 A CN 111688891A CN 202010580925 A CN202010580925 A CN 202010580925A CN 111688891 A CN111688891 A CN 111688891A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
- B63G8/14—Control of attitude or depth
- B63G8/16—Control of attitude or depth by direct use of propellers or jets
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
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- Fluid Mechanics (AREA)
- Aviation & Aerospace Engineering (AREA)
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- Ocean & Marine Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention discloses an open-loop active flow control device of an underwater glider based on synthetic jet, which relates to the field of active flow control and comprises a mechanical double-cavity vibration type synthetic jet exciter arranged at the inner front end of an underwater glider wing; the mechanical double-cavity vibration type synthetic jet actuator is electrically connected with a control unit, and the control unit is fixedly arranged in the underwater glider; the front end of the upper surface of the wing of the underwater glider is provided with a plurality of jet nozzles, and the mechanical double-cavity vibration type synthetic jet actuator is positioned at the jet nozzles. The open-loop active flow control device of the underwater glider based on the synthetic jet obtains local or global effective flow change through local disturbance, and further achieves the purposes of increasing lift, reducing resistance, improving a flow field, suppressing noise and the like.
Description
Technical Field
The invention relates to the technical field of active flow control, in particular to an open-loop active flow control device of an underwater glider based on synthetic jet.
Background
An Underwater Glider (UG) is a new type of Underwater vehicle that uses net buoyancy and attitude angle adjustments to obtain propulsion. Compared with the traditional underwater vehicle, the underwater glider has the advantages of long range, strong continuous working capability, good economical efficiency and the like. The underwater glider serving as an underwater unmanned intelligent mobile platform has wide application prospect and great potential value in the fields of exploration of marine resources, marine scientific investigation, military and the like. The underwater glider can be divided into a traditional rotary type and a wing body fusion type according to the appearance. Because the shape of the revolution body shell can not provide very high lift force like hydrofoils, the maximum lift-drag ratio of the traditional revolution body type glider under the condition of additionally arranging the hydrofoils with high aspect ratio can only reach about 5. The wing body integrated underwater glider can obviously improve the lift-drag ratio due to larger water wing area.
The glide ratio of an underwater glider is one of the key factors determining the range and the economy of the underwater glider, and the glide ratio is mainly determined by the lift-drag ratio of the underwater glider. Thus, lift-drag ratio is critical to glider range and economy. At present, the lift-drag ratio of the underwater glider with the fused wing body can reach 15-20 through shape optimization design, however, no matter how the shape is optimized, the resistance coefficient is increased and the lift coefficient is reduced due to the flow separation phenomenon in the sailing process, and further improvement of the lift-drag ratio is limited. Furthermore, relying solely on profile optimization to raise the lift-to-drag ratio of an underwater glider can narrow the interior space of the glider, impairing its detection capability or operating time.
Disclosure of Invention
The invention aims to provide an open-loop active flow control device of an underwater glider based on synthetic jet, which aims to solve the problems in the prior art, obtain local or global effective flow change through local disturbance, and further achieve the purposes of increasing lift, reducing resistance, improving a flow field, inhibiting noise and the like.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides an open-loop active flow control device of an underwater glider based on synthetic jet, which comprises a mechanical double-cavity vibration type synthetic jet exciter, a mechanical double-cavity vibration type synthetic jet exciter and a mechanical double-cavity vibration type synthetic jet exciter, wherein the mechanical double-cavity vibration type synthetic jet exciter is arranged at the inner front end of an underwater glider wing; the mechanical double-cavity vibration type synthetic jet actuator is electrically connected with a control unit, and the control unit is fixedly arranged in the underwater glider; the front end of the upper surface of the wing of the underwater glider is provided with a plurality of jet nozzles, and the mechanical double-cavity vibration type synthetic jet actuator is positioned at the jet nozzles.
Optionally, the mechanical dual-cavity vibration type synthetic jet actuator includes a first cavity and a second cavity which are fixedly connected and are communicated with each other inside, the horizontal cross sections of the first cavity and the second cavity are in an 8-shaped structure, circular cavities are respectively formed in the first cavity and the second cavity, the diameter of the cavity in the first cavity is larger than that of the cavity in the second cavity, and the height of the cavity in the first cavity is larger than that of the cavity in the second cavity; a communicating opening is formed in the bottom of the inner wall of the joint of the first cavity and the second cavity, a horizontally arranged piston guide rail is connected between the two inner walls of the first cavity, and a mechanical reciprocating piston in contact with the top wall in the first cavity is sleeved on the piston guide rail; a first nozzle is formed in the top of the second cavity, and a second nozzle is formed in the top of the first cavity.
Optionally, the length of the tangent plane of the underwater glider wing is c, and the mechanical double-cavity vibration type synthetic jet actuator is located at a position 0.3c of the front end of the underwater glider wing.
Compared with the prior art, the invention has the following technical effects:
the invention carries out active flow control on the wing body fusion underwater glider by a synthetic jet technology. Control of the flow is achieved in the body flow field by applying perturbations through the stationary jets and coupling with the intrinsic mode of the flow. Local or global effective flow change is obtained through local disturbance, and the purposes of increasing lift, reducing drag, improving a flow field, suppressing noise and the like are further achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of a local section of an underwater glider wing according to the present invention;
FIG. 2 is a partial dimensional view of FIG. 1;
FIG. 3 is a schematic top view of the underwater glider of the present invention;
FIG. 4 is a schematic cross-sectional view of a mechanical dual chamber vibratory synthetic jet actuator of the present invention;
FIG. 5 is a schematic view of a mechanical dual chamber vibratory synthetic jet actuator of the present invention;
wherein, 1 is an underwater glider wing, 2 is a mechanical double-cavity vibration type synthetic jet actuator, 201 is a first cavity, 202 is a second cavity, 203 is a piston guide rail, 204 is a mechanical reciprocating piston, 205 is a first nozzle, 206 is a second nozzle, 3 is a control unit, and 4 is a jet nozzle.
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 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 invention aims to provide an open-loop active flow control device of an underwater glider based on synthetic jet, which aims to solve the problems in the prior art, obtain local or global effective flow change through local disturbance, and further achieve the purposes of increasing lift, reducing resistance, improving a flow field, inhibiting noise and the like.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides an open-loop active flow control device of an underwater glider based on synthetic jet, which comprises a mechanical double-cavity vibration type synthetic jet exciter 2 arranged at the inner front end of an underwater glider wing 1, as shown in figures 1-5; the mechanical double-cavity vibration type synthetic jet exciter 2 is electrically connected with a control unit 3, and the control unit 3 is fixedly arranged in the underwater glider; a plurality of jet nozzles 4 are arranged at the front end of the upper surface of an underwater glider wing 1, and a mechanical double-cavity vibration type synthetic jet exciter 2 is positioned at the positions of the jet nozzles 4.
Further preferably, the mechanical dual-cavity vibration type synthetic jet actuator 2 comprises a first cavity 201 and a second cavity 202 which are fixedly connected and are communicated with each other inside, the horizontal sections of the first cavity 201 and the second cavity 202 are in an 8-shaped structure, circular cavities are respectively arranged in the first cavity 201 and the second cavity 202, the diameter of the cavity in the first cavity 201 is larger than that of the cavity in the second cavity 202, and the height of the cavity in the first cavity 201 is larger than that of the cavity in the second cavity 202; a communication port is formed in the bottom of the inner wall of the joint of the first cavity 201 and the second cavity 202, a horizontally arranged piston guide rail 203 is connected between the two inner walls of the first cavity 201, and a mechanical reciprocating piston 204 in contact with the inner top wall of the first cavity 201 is sleeved on the piston guide rail 203; the top of the second cavity 202 is provided with a first nozzle 205, and the top of the first cavity 201 is provided with a second nozzle 206; the second nozzle 206 is located at an end of the first cavity 201 near the second cavity 202. The section length of the underwater glider wing 1 is c, and the mechanical double-cavity vibration type synthetic jet exciter 2 is positioned at the 0.3c position of the front end of the underwater glider wing 1.
The invention is suitable for the underwater glider which has long voyage, fixed voyage state, small change of voyage environment and no great maneuverability requirement during voyage. In response to such operational requirements, active flow control drag reduction systems employ open-loop synthetic jet systems. The system does not monitor the peripheral flow field in real time, and the active flow control strategy is completely dependent on the navigation state of the aircraft. And operating the active flow control system according to a preset control strategy, and adjusting the jet hole angle, the jet frequency and the jet momentum coefficient. The open-loop synthetic jet control system has low requirements on a control system processor, and the energy consumption of the control system is low because the peripheral flow field does not need to be monitored in real time. Low energy consumption is particularly important for a novel underwater vehicle, namely an underwater glider, which is designed for open sea large voyage.
The mechanical dual chamber vibrating synthetic jet actuator 2 is an autonomous design mechanism. The mechanism adopts a high-frequency linear reciprocating motor as an actuator and adopts a double-cavity design. Compared with the traditional active flow exciter in air, the exciter is more suitable for the active flow control work requirement under water. In contrast to air, active flow control under water requires more operating pressure to be accommodated due to differences in fluid characteristics such as viscosity coefficient, density, etc. of the fluid. The high-frequency linear reciprocating motor can provide a higher jet flow momentum coefficient for flow control and can bear higher working pressure. However, the working frequency of the high-frequency linear reciprocating motor cannot meet the jet flow frequency requirement, so that a double-cavity structure is designed for the mechanical synthetic jet flow exciter, and compared with the single-cavity structure, the double-cavity structure greatly improves the working efficiency and the working frequency of the exciter, so that the mechanical synthetic jet flow exciter can effectively meet the working requirement of flow control of the underwater synthetic jet flow.
The mechanical double-cavity vibration type synthetic jet actuator is designed to correspond to a synthetic jet open-loop flow control system. The mechanical double-cavity vibration type synthetic jet actuator can provide a higher jet momentum coefficient for a flow control system due to the characteristics of the mechanical structure of the mechanical double-cavity vibration type synthetic jet actuator. However, mechanical synthetic jet actuators cannot provide high jet frequencies and cannot rapidly switch operating states due to the mechanical reciprocating piston. Therefore, the jet flow velocity and the jet flow momentum coefficient can not meet the sailing requirement that the jet flow frequency and the jet flow momentum coefficient need to be quickly converted due to strong maneuverability.
The mechanical double cavity vibration type synthetic jet exciter 2 is installed in a position of a deviated front edge of an underwater glider. The reason is that: 1. the working pressure at the leading edge is greater. 2. The jet flow frequency of the exciter is low at the front edge, and the jet flow coefficient is high. Exactly the opposite is at the trailing edge. 3. Based on flow field characteristics, the leading edge can be regarded as a steady laminar flow which can be basically predicted. And the trailing edge is the flow separation affected zone, and the turbulent flow state is difficult to predict. The exciter is arranged at the front edge, so that the peripheral flow field of the exciter can be better predicted according to the navigation state of the aircraft. 4. According to experimental data, better flow control effect is realized at the position of 30% c in the interval of 10% c to 50% c of the front edge.
The principle and the implementation mode of the invention are explained by applying a specific example, 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, 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.
Claims (3)
1. The utility model provides an open-loop active flow control device of glider under water based on synthetic efflux which characterized in that: the mechanical double-cavity vibration type synthetic jet actuator is arranged at the front end in an underwater glider wing; the mechanical double-cavity vibration type synthetic jet actuator is electrically connected with a control unit, and the control unit is fixedly arranged in the underwater glider; the front end of the upper surface of the wing of the underwater glider is provided with a plurality of jet nozzles, and the mechanical double-cavity vibration type synthetic jet actuator is positioned at the jet nozzles.
2. The synthetic jet based open loop active flow control device for an underwater glider according to claim 1, characterized in that: the mechanical double-cavity vibration type synthetic jet actuator comprises a first cavity and a second cavity which are fixedly connected and are communicated with each other inside, the horizontal sections of the first cavity and the second cavity are in an 8-shaped structure, round cavities are respectively arranged in the first cavity and the second cavity, the diameter of the cavity in the first cavity is larger than that of the cavity in the second cavity, and the height of the cavity in the first cavity is larger than that of the cavity in the second cavity; a communicating opening is formed in the bottom of the inner wall of the joint of the first cavity and the second cavity, a horizontally arranged piston guide rail is connected between the two inner walls of the first cavity, and a mechanical reciprocating piston in contact with the top wall in the first cavity is sleeved on the piston guide rail; a first nozzle is formed in the top of the second cavity, and a second nozzle is formed in the top of the first cavity.
3. The synthetic jet based open loop active flow control device for an underwater glider according to claim 1, characterized in that: the section length of the underwater glider wing is c, and the mechanical double-cavity vibration type synthetic jet actuator is positioned at the position of 0.3c at the front end of the underwater glider wing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010580925.3A CN111688891B (en) | 2020-06-23 | 2020-06-23 | Open-loop active flow control device of underwater glider based on synthetic jet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010580925.3A CN111688891B (en) | 2020-06-23 | 2020-06-23 | Open-loop active flow control device of underwater glider based on synthetic jet |
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| CN111688891A true CN111688891A (en) | 2020-09-22 |
| CN111688891B CN111688891B (en) | 2021-04-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114560055A (en) * | 2022-03-03 | 2022-05-31 | 西北工业大学 | Parameterization method applicable to structural design of wing-body fusion underwater glider |
| CN114771789A (en) * | 2022-04-08 | 2022-07-22 | 西北工业大学 | Electromagnetic flow control device with extremely-high power consumption and application |
| CN115973391A (en) * | 2023-02-02 | 2023-04-18 | 中国石油大学(华东) | Multi-piston driving type synthetic jet underwater propeller |
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| CN1818399A (en) * | 2006-03-13 | 2006-08-16 | 中国人民解放军国防科学技术大学 | Synthetic jetting excitor with single-membrane, double openings and double cavities |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114560055A (en) * | 2022-03-03 | 2022-05-31 | 西北工业大学 | Parameterization method applicable to structural design of wing-body fusion underwater glider |
| CN114771789A (en) * | 2022-04-08 | 2022-07-22 | 西北工业大学 | Electromagnetic flow control device with extremely-high power consumption and application |
| CN115973391A (en) * | 2023-02-02 | 2023-04-18 | 中国石油大学(华东) | Multi-piston driving type synthetic jet underwater propeller |
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| CN111688891B (en) | 2021-04-20 |
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