CN111572704A - Open-loop active flow control device of underwater glider based on steady jet - Google Patents
Open-loop active flow control device of underwater glider based on steady jet Download PDFInfo
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- CN111572704A CN111572704A CN202010580939.5A CN202010580939A CN111572704A CN 111572704 A CN111572704 A CN 111572704A CN 202010580939 A CN202010580939 A CN 202010580939A CN 111572704 A CN111572704 A CN 111572704A
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- jet
- underwater glider
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- water spray
- flow control
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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
Abstract
The invention discloses an open-loop active flow control device of an underwater glider based on steady jet flow, which relates to the field of active flow control and comprises a micro water spray pump set arranged at the rear end below wings of the underwater glider, wherein the micro water spray pump set is communicated with a water storage bin, the bottom of the water storage bin is communicated with a micro submersible pump, and the micro submersible pump and the micro water spray pump set are respectively connected with a control unit; the miniature water spray pump set is connected with a fixed nozzle, the end part of the fixed nozzle is communicated with a steady jet opening, and the steady jet opening is arranged at the rear end of the upper surface of the wing of the underwater glider. The invention realizes the local disturbance in a steady jet flow form through the micro water spray pump group, thereby completing the active flow control.
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 steady 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 steady jet flow, which aims to solve the problems in the prior art, and realizes local disturbance in the form of the steady jet flow through a micro water jet pump set so as to complete active flow control.
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 steady jet, which comprises a micro water spray pump set arranged at the rear end inside an underwater glider wing, wherein the micro water spray pump set is communicated with a water storage bin, the bottom of the water storage bin is communicated with a micro submersible pump, and the micro submersible pump and the micro water spray pump set are respectively connected with a control unit; the miniature water spray pump set is connected with a fixed nozzle, the end part of the fixed nozzle is communicated with a steady jet opening, and the steady jet opening is arranged at the rear end of the upper surface of the wing of the underwater glider.
Optionally, the speed at the steady jet opening is:
Ujet＝Ublowingdjet
Ublowingexpressed as the fixed nozzle opening velocity value, djetIs the unit vector of the jet exit direction and defines djetAngle theta with the tangential direction of the local surface of the wing profile of an underwater glider wingjetIs the jet deflection angle.
Optionally, the jet velocity U at the steady jet openingblowingRelative to underwater incoming flow velocity U∞The jet velocity ratio is:
the speed ratio of the fixed nozzle of the micro water spray pump set is Rjet＝1.429。
Optionally, the length of the wing section of the underwater glider is c, and the position of the fixed nozzle is xjet70% × c, and the angle of the fixed nozzle relative to the length direction of the section is thetajet＝30°。
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 through the steady 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 schematic view of the angle and size markings of FIG. 1;
FIG. 3 is a schematic top view of an underwater glider wing according to the present invention;
wherein, 1 is the wing of the underwater glider, 2 is a micro water spray pump group, 3 is a water storage bin, 4 is a micro submersible pump, 5 is a control unit, 6 is a fixed nozzle, and 7 is a steady jet opening.
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 steady jet flow, which aims to solve the problems in the prior art, and realizes local disturbance in the form of the steady jet flow through a micro water jet pump set so as to complete active flow control.
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 steady jet, which comprises a micro water spray pump set 2 arranged at the rear end below an underwater glider wing 1, wherein the micro water spray pump set 2 is communicated with a water storage bin 3, the bottom of the water storage bin 3 is communicated with a micro submersible pump 4, and the micro submersible pump 4 and the micro water spray pump set 2 are respectively connected with a control unit 5; the micro water spray pump set 2 is connected with a fixed nozzle 6, the end part of the fixed nozzle 6 is communicated with a steady jet opening 7, and the steady jet opening 7 is arranged at the rear end of the upper surface of the wing 1 of the underwater glider.
Further preferably, the velocity at the stationary jet opening 7 is:
Ujet＝Ublowingdjet
Ublowingexpressed as the speed value at the fixed nozzle 6, djetIs the unit vector of the jet exit direction and defines djetAngle theta to the local surface tangent of the airfoil profile of the underwater glider wing 1jetIs the jet deflection angle.
Jet velocity U at steady jet opening 7blowingRelative to underwater incoming flow velocity U∞The jet velocity ratio is:
the speed ratio of the fixed nozzle of the micro water spray pump set 2 is Rjet＝1.429。
The length of the section of the wing 1 of the underwater glider is c, and the position of the fixed nozzle 6 is xjet70% × c, and the angle of the fixed nozzle 6 relative to the length direction of the wing tangent plane is thetajet＝30°。
In the invention, water is stored in the water storage bin 3 through the micro submersible pump 4 in a navigation process or a cruising state, and the control unit 5 sprays water outwards through the micro water spray pump set 2 and the fixed nozzle 3 through the constant jet flow opening 7 to realize local disturbance in a constant jet flow form when working, thereby completing active flow control.
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 (4)
1. The utility model provides an open-loop active flow control device of glider under water based on jet current surely keeps constant which characterized in that: the underwater glider wing spraying device comprises a micro water spray pump set arranged at the rear end inside an underwater glider wing, wherein the micro water spray pump set is communicated with a water storage bin, the bottom of the water storage bin is communicated with a micro submersible pump, and the micro submersible pump and the micro water spray pump set are respectively connected with a control unit; the miniature water spray pump set is connected with a fixed nozzle, the end part of the fixed nozzle is communicated with a steady jet opening, and the steady jet opening is arranged at the rear end of the upper surface of the wing of the underwater glider.
2. The steady jet based open loop active flow control device for an underwater glider according to claim 1, characterized in that: the speed at the steady jet opening is as follows:
Ujet＝Ublowingdjet
Ublowingexpressed as the fixed nozzle opening velocity value, djetIs the unit vector of the jet exit direction and defines djetAngle theta with the tangential direction of the local surface of the wing profile of an underwater glider wingjetIs the jet deflection angle.
3. The steady jet based open loop active flow control device for an underwater glider according to claim 2, characterized in that: jet velocity U at steady jet openingblowingRelative to underwater incoming flow velocity U∞The jet velocity ratio is:
the speed ratio of the fixed nozzle of the micro water spray pump set is Rjet＝1.429。
4. The steady jet based open loop active flow control device for an underwater glider according to claim 1, characterized in that: the length of the wing section of the underwater glider is c, and the position of the fixed nozzle is xjet70% × c, and the angle of the fixed nozzle relative to the length direction of the section is thetajet＝30°。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010580939.5A CN111572704A (en) | 2020-06-23 | 2020-06-23 | Open-loop active flow control device of underwater glider based on steady jet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010580939.5A CN111572704A (en) | 2020-06-23 | 2020-06-23 | Open-loop active flow control device of underwater glider based on steady jet |
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| CN111572704A true CN111572704A (en) | 2020-08-25 |
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Citations (5)
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|---|---|---|---|---|
| US20120037064A1 (en) * | 2010-08-12 | 2012-02-16 | Larry Douglas Back | Braking system for watercraft |
| CN106050566A (en) * | 2016-07-13 | 2016-10-26 | 西北工业大学 | Control device and method for circulation of blunt trailing edge wind turbine airfoil |
| CN107416154A (en) * | 2017-05-11 | 2017-12-01 | 江苏科技大学 | A kind of passway for water, water pocket regulation underwater unmanned vehicle and its control system |
| CN107458583A (en) * | 2017-07-26 | 2017-12-12 | 南京航空航天大学 | A kind of Flying-wing's aircraft course control device based on active Flow Control technology |
| CN108545162A (en) * | 2018-06-20 | 2018-09-18 | 天津中德应用技术大学 | Underwater spectroradiometer based on water jet driving |
-
2020
- 2020-06-23 CN CN202010580939.5A patent/CN111572704A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120037064A1 (en) * | 2010-08-12 | 2012-02-16 | Larry Douglas Back | Braking system for watercraft |
| CN106050566A (en) * | 2016-07-13 | 2016-10-26 | 西北工业大学 | Control device and method for circulation of blunt trailing edge wind turbine airfoil |
| CN107416154A (en) * | 2017-05-11 | 2017-12-01 | 江苏科技大学 | A kind of passway for water, water pocket regulation underwater unmanned vehicle and its control system |
| CN107458583A (en) * | 2017-07-26 | 2017-12-12 | 南京航空航天大学 | A kind of Flying-wing's aircraft course control device based on active Flow Control technology |
| CN108545162A (en) * | 2018-06-20 | 2018-09-18 | 天津中德应用技术大学 | Underwater spectroradiometer based on water jet driving |
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| 刘峰等: "合成射流物理参数对控制翼型流动分离的影响", 《浙江大学学报》 * |
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Application publication date: 20200825 |