CN112026984B - Electrolytic microbubble stability observation test device - Google Patents
Electrolytic microbubble stability observation test device Download PDFInfo
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- CN112026984B CN112026984B CN202010882176.XA CN202010882176A CN112026984B CN 112026984 B CN112026984 B CN 112026984B CN 202010882176 A CN202010882176 A CN 202010882176A CN 112026984 B CN112026984 B CN 112026984B
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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
- 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
- B63B2001/387—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes using means for producing a film of air or air bubbles over at least a significant portion of the hull surface
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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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Abstract
The utility model provides an electrolysis microbubble stability observation test device, relates to the active drag reduction technical field of the body of navigating under water, including microbubble stability observation platform, electronic flowmeter, stepless speed regulation water pump, microbubble stability observation platform is inside to be equipped with trapezoidal diffusion section, energy dissipation orifice plate, honeycomb rectifier network, screen cloth, receive pit electrolysis observation test piece, spring probe, carbon rod a little in proper order along the direction of fluid motion, and microbubble stability observation platform front end is connected with electronic flowmeter and stepless speed regulation water pump through water pipeline, and the spring probe passes through power wire and connects the power negative pole, and the carbon rod is anodal. Through the combined action of multiple effects of steady flow, energy dissipation, rectification in the vertical direction and rectification in the horizontal direction of the trapezoid diffusion section, the energy dissipation pore plate, the honeycomb rectification net and the screen, the dynamic water flow reaches a stable state, and stable residence of microbubbles and observation of the growth process and residence clear condition of the microbubbles in the micro-nano pits at the microscale are facilitated.
Description
Technical Field
The invention relates to the technical field of active drag reduction of underwater navigation bodies, in particular to an electrolytic microbubble stability observation test device.
Background
In recent years, the promotion of the propulsion speed, the maneuvering performance and the striking precision of an underwater anti-submarine battle sailing weapon becomes the key of leading sea control right in China, the underwater battle weapon (such as a torpedo) has strong concealment and large lethality, and simultaneously has accurate guidance capability, and as the attack range is below the waterline, the enemy warship fighting force can be effectively destroyed once hitting a target. In order to effectively hit the target, the speed of the underwater combat weapon must reach 1.5 times of the target speed, and the higher the speed, the stronger the hitting destructive power is, otherwise, the enemy ship cannot be hurt enough, and even cannot hit the target. The resistance borne by the underwater navigation body is about 1000 times of that of an air aircraft, and the obvious reduction of the resistance is difficult to realize by adopting the conventional method for increasing the thrust or optimizing the linearity of the aircraft at present.
The air cushion formed by the bionic groove surface and the micro-bubbles has great potential application value for flow resistance reduction, so that the micro-bubble resistance reduction technology becomes one of the research hotspots in the field of underwater resistance reduction. Currently, there are major technical bottlenecks to be broken through in researches on microbubble formation, residence control and microbubble drag reduction mechanisms. In flowing water, the growth process, stable residence and residence conditions of micro-bubbles in micro-nano pits are extremely difficult to observe under the multi-scale complex flowing environment, at present, an application type micro-bubble dynamic microscopic observation device is not available, the micro-bubble dynamic microscopic observation device can enable the micro-bubbles to stably reside in low-speed water flow and observe the growth process of the micro-bubbles in the micro-nano pits in real time under the micro-scale condition, and the residence conditions provide a certain test basis for deeply researching the residence stability and the micro-bubble resistance reduction mechanism so as to greatly reduce the underwater resistance of an underwater vehicle.
Disclosure of Invention
The invention aims to overcome the key problems that resident microbubbles are difficult to stably reside and the growth process and the residence condition of the microbubbles can be clearly observed under the microscale in the microbubble drag reduction technology, and provides an electrolytic microbubble stability observation test device which is based on multiple composite actions of steady flow, energy dissipation, rectification in the vertical direction and rectification in the horizontal direction of a trapezoidal diffusion section, an energy dissipation pore plate, a honeycomb rectification net and a screen, so that dynamic water flow reaches a stable state, the residence stability of the microbubbles is improved, the growth behavior of the microbubbles is easy to observe, and the microbubble drag reduction is realized.
The device comprises a microbubble stability observation platform, an electronic flowmeter and a stepless speed regulation water pump direct current power supply, wherein a trapezoidal diffusion section, an energy dissipation pore plate, a honeycomb rectifying net, a screen, a micro-nano pit electrolysis observation test piece, a spring probe and a carbon rod are sequentially arranged in the microbubble stability observation platform along the fluid movement direction, the front end of the microbubble stability observation platform is connected with the electronic flowmeter and the stepless speed regulation water pump through a water pipeline, the spring probe is connected with the negative electrode of the direct current power supply through a power supply lead, and the carbon rod is connected with the positive electrode of the power supply.
The microbubble stability observation platform can be made of organic glass.
The microbubble stability observation platform front end adopts trapezoidal diffusion section, and two base length can be 10~30mm, 60~80mm, and the height can be 45~65 mm.
The energy dissipation orifice plate thickness is 2~4mm, and honeycomb rectifier network thickness can be 13~26mm, and screen cloth thickness can be 2~4 mm.
The interval of energy dissipation orifice plate and honeycomb rectification net can be 40~60mm, and the interval of honeycomb rectification net and screen cloth can be 30~50 mm.
The distance between the screen and the electrolytic observation test piece is more than 50 mm.
The thickness of the micro-nano pit electrolytic observation test piece can be 10-15 mm.
The interval between the spring probe and the carbon rod can be 40-80 mm.
The length of the carbon rod can be 6mm, and the width of the carbon rod can be 6 mm;
the water flow speed of the microbubble stability observation platform can be 0-2 m/s;
the middle part of the microbubble stability observation platform is paved with a waterproof ring with the diameter of 2 mm.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the invention selects organic glass to manufacture a microbubble stability observation platform, the front end of the platform is connected with an electronic flowmeter and a stepless speed regulation water pump, a trapezoidal diffusion section, an energy dissipation pore plate, a honeycomb rectifying net, a screen mesh, a micro-nano pit electrolysis observation test piece, a spring probe and a carbon rod are sequentially arranged in the platform along the fluid motion direction, the spring probe is connected with a DC power supply cathode through a power supply lead, the carbon rod is connected with a power supply anode, the spring probe is used as an electrolysis cathode, microbubbles are generated in the micro-nano pit electrolysis observation test piece through electrolyzing NaCl solution, stable flow of fluid in an electrolysis test piece placing area is realized by utilizing multiple composite rectifying effects of the trapezoidal diffusion section, the energy dissipation pore plate, the honeycomb rectifying net and the screen mesh, stable residence of the microbubbles at a certain flow speed is realized, and the permeable characteristic of the organic glass is utilized to carry out real-time dynamic observation on the electrolysis test piece area through an electronic microscope, the problem of under the prior art, microbubble is difficult to stably reside in the developments rivers, is difficult to clearly observe growth process and the condition of residing is solved, reaches stable lasting drag reduction effect.
2. The invention can stably maintain the residence of the micro-bubbles in water flow with certain flow velocity, can enhance the continuity and effectiveness of micro-bubble drag reduction, and is more beneficial to application in practical scenes.
3. The invention can realize real-time dynamic observation of the growth condition of the microbubbles in a complex flowing environment in water, and is beneficial to researching the residence stability and the drag reduction mechanism of the microbubbles.
4. The invention can control the speed of water flow by adjusting the stepless water pump, and observe the flow of the test device in real time by the electronic flowmeter, thereby realizing the observation of the residence condition of micro bubbles under different flow rates, and being suitable for the condition of low flow rate.
5. The invention uses direct current power supply to generate micro bubbles by electrolysis, does not need long-time continuous ventilation and has less energy consumption.
6. The invention can control the generating speed of the micro bubbles by adjusting the voltage, thereby reducing energy consumption and being beneficial to realizing the control of the resistance reducing effect.
Drawings
Fig. 1 is a schematic structural diagram of an electrolytic microbubble stability observation test device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a microbubble stability observation platform;
fig. 3 is a schematic diagram of the operation of the electrolytic microbubble stability observation test device.
Each of the labels in the figure is: 1-stepless speed-regulating water pump; 2-switching the valve; 3-an electronic flow meter; 4-water pipeline; 5-a trapezoidal diffusion section; 6-microbubble stability observation platform; 7-energy dissipation pore plate; 8-a cellular rectifier network; 9-a screen mesh; 10-micro-nano pit electrolytic observation test piece; 11-spring probe; 12-a carbon rod; 13-microbubbles.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention clearer and more obvious, the following embodiments will explain the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1, in this embodiment, an electrolytic microbubble stability observation test device includes a microbubble stability observation platform 6, an electronic flowmeter 3, and a stepless speed-regulating water pump 1;
the microbubble stability observation platform 6 is made of organic glass materials, and a trapezoidal diffusion section 5, an energy dissipation pore plate 7, a honeycomb rectifier net 8, a screen 9, a micro-nano pit electrolysis observation test piece 10, a spring probe 11 and a carbon rod 12 are sequentially arranged in the microbubble stability observation platform 6 along the fluid movement direction;
the front end of the microbubble stability observation platform 6 adopts a trapezoidal diffusion section 5, the length of two bottom edges is 10-30 mm, 60-80 mm, and the height is 45-65 mm.
The thickness of the energy dissipation pore plate 7 is 2-4 mm, the thickness of the honeycomb rectifying net 8 is 13-26 mm, and the thickness of the screen 9 is 2-4 mm.
The interval between the energy dissipation pore plate 7 and the honeycomb rectifying net 8 is 40-60 mm, and the interval between the honeycomb rectifying net 8 and the screen 9 is 30-50 mm.
The distance between the screen 9 and the electrolytic observation test piece 10 is more than 50 mm.
The thickness of the micro-nano pit electrolytic observation test piece 10 is 10-15 mm.
The interval between the spring probe 11 and the carbon rod 12 is 40-80 mm.
The length of the carbon rod 12 is 6mm, and the width of the carbon rod is 6 mm;
the water flow speed of the microbubble stability observation platform 6 is 0-2 m/s;
and a waterproof ring with the diameter of 2mm is laid on the outer edge of the microbubble stability observation platform 6.
As shown in fig. 1 to 3, the principle of the present invention is as follows:
1. when the device works, when water flows pass through the stepless speed regulation water pump 1 and the water pipeline 4 to enter the microbubble stability observation platform 6, the water flows firstly pass through the trapezoidal diffusion section 5, and the trend that fluid is converted into turbulent flow can be reduced to the minimum by the trapezoidal diffusion section, so that the stability of the water flow entering from the water pipeline is ensured; secondly, the water flow passes through the energy dissipation pore plate 7, and the energy dissipation pore plate 7 has the functions of eliminating most impact energy of the water flow and reducing the impact force of the water flow; then the water flows through the honeycomb rectifying net 8, and the honeycomb rectifying net 8 has the function of reducing the vertical disturbance of the incoming flow fluid, so that the fluid becomes gentle in the vertical direction; finally, the screen 9 is used for reducing the horizontal disturbance of the incoming flow fluid, so that the fluid becomes flat in the horizontal direction.
When water flows to the area where the micro-nano pit electrolysis observation test piece 10 is placed, the water flows through the flow stabilization, the energy dissipation, the vertical direction rectification and the horizontal direction rectification of the diffusion section 5, the energy dissipation pore plate 7, the honeycomb rectification net 8 and the screen 9, and the dynamic water flow reaches an extremely stable state, so that stable residence of micro-bubbles in the micro-nano pits and clear observation of growth processes and residence conditions of the micro-bubbles are facilitated.
2. When the device works, the micro-nano pit electrolysis observation test piece 10 is placed on the micro-bubble stability observation platform 6, the direct-current voltage cathode and the micro-nano pit electrolysis observation test piece 10 are conducted through the spring probe 11, the carbon rod 12 is connected to the direct-current voltage anode, and observation is carried out through the electron microscope. The gas generated at the cathode of the micro-nano pit electrolysis observation test piece 10 through the electrolysis reaction is bound by the micro-nano pit, so that micro bubbles 13 are formed, when the micro bubbles 13 are filled in the pit, the formed micro bubbles 13 can obstruct the reaction between the electrolysis test piece and the fluid solution, and the reaction is automatically terminated.
When the device works, stably-retained micro bubbles can be clearly observed above the micro-nano pit electrolytic observation test piece 10 through a microscope, so that the drag reduction effect is realized; the invention can process low-speed incoming flow, realize the rectification effect on dynamic water flow and improve the residence stability of the microbubbles 13 under the low-speed water flow. The invention can work autonomously along with the breaking or falling of the micro-bubbles 13, realizes the self-adaptive control of the micro-bubbles 13, has low energy consumption and cost, is easy to realize the application in practical engineering, and can control the generation rate of the micro-bubbles 13 by adjusting the voltage and control the flow rate of water flow by adjusting the stepless speed-adjusting water pump, thereby realizing the research on the residence condition of the micro-bubbles 13 and the resistance-reducing effect under different flow rates.
Claims (5)
1. The utility model provides an electrolysis microbubble stability observation test device which characterized in that: the device comprises a microbubble stability observation platform, an electronic flowmeter and a stepless speed regulation water pump, wherein a trapezoidal diffusion section, an energy dissipation pore plate, a honeycomb rectifier net, a screen, a micro-nano pit electrolysis observation test piece, a spring probe and a carbon rod are sequentially arranged in the microbubble stability observation platform along the fluid movement direction;
wherein the water flow speed of the microbubble stability observation platform is 0-2 m/s;
the front end of the microbubble stability observation platform adopts a trapezoidal diffusion section, the lengths of two bottom edges are respectively 10-30 mm and 60-80 mm, and the height is 45-65 mm;
the thickness of the energy dissipation pore plate is 2-4 mm, the thickness of the honeycomb rectifying net is 13-26 mm, and the thickness of the screen mesh is 2-4 mm; the distance between the energy dissipation pore plate and the honeycomb rectifying net is 40-60 mm, and the distance between the honeycomb rectifying net and the screen is 30-50 mm;
the distance between the spring probe and the carbon rod is 40-80 mm;
the distance between the screen and the electrolytic observation test piece is more than 50 mm;
in addition, the operation method of the test device comprises the following steps:
the method comprises the following steps that water flow enters a micro-bubble stability observation platform after passing through a stepless speed-regulating water pump and a water pipeline, and in the micro-bubble stability observation platform, the water flow firstly passes through a trapezoidal diffusion section, and the trapezoidal diffusion section evolves fluid of the water flow into a state with a reduced turbulent flow trend, so that the water flow entering from the water pipeline is stable; after the water flow passes through the energy dissipation pore plate, the impact energy of the water flow is eliminated by the energy dissipation pore plate so as to reduce the impact force of the water flow; the water flow passing through the energy dissipation pore plate flows through the honeycomb rectifying net, and the honeycomb rectifying net reduces the vertical disturbance of the fluid of the water flow incoming flow, so that the fluid is smoothly treated in the vertical direction; finally, the water flow passes through a screen, the horizontal disturbance of the incoming flow fluid is reduced by the screen, the fluid is smoothly processed in the horizontal direction, and finally the water flow flows to the area where the micro-nano pit electrolytic observation test piece is placed;
when water flows to the area where the micro-nano pit electrolysis observation test piece is placed, the micro-nano pit electrolysis observation test piece is placed on a micro-bubble stability observation platform, a direct-current voltage negative electrode and the micro-nano pit electrolysis observation test piece are conducted through a spring probe, a carbon rod is connected to a direct-current voltage positive electrode, gas generated at the negative electrode of the micro-nano pit electrolysis observation test piece through electrolytic reaction is observed by an electron microscope, the gas is restrained and retained by the micro-nano pit, micro bubbles are formed, when the micro bubbles are filled with the pits, the formed micro bubbles can block the reaction between the electrolysis test piece and a fluid solution, and the electrolytic reaction is automatically terminated.
2. An electrolytic microbubble stability observation test device as claimed in claim 1, characterized in that: the thickness of the micro-nano pit electrolytic observation test piece is 10-15 mm.
3. An electrolytic microbubble stability observation test device as claimed in claim 1, characterized in that: the length of carbon-point is 6mm, and the width is 6 mm.
4. An electrolytic microbubble stability observation test device as claimed in claim 1, characterized in that: the microbubble stability observation platform is made of organic glass.
5. An electrolytic microbubble stability observation test device as claimed in claim 1, characterized in that: a waterproof ring with the diameter of 2mm is laid in the middle of the microbubble stability observation platform.
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| CN202010882176.XA CN112026984B (en) | 2020-08-27 | 2020-08-27 | Electrolytic microbubble stability observation test device |
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| CN114323552B (en) * | 2021-11-18 | 2022-10-21 | 厦门大学 | Method for judging stability of water entering and exiting from cross-medium navigation body |
| CN114813035B (en) * | 2022-04-12 | 2023-03-21 | 厦门大学 | Thermal surface cavitation synergistic resistance reduction test device and method |
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| CN111537190A (en) * | 2020-05-19 | 2020-08-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Test device for flow-induced vibration of passive body of pressure high chord-thickness ratio air box |
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2020
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| US10203274B2 (en) * | 2006-10-06 | 2019-02-12 | California Institute Of Technology | Optical focusing inside scattering media with time-reversed ultrasound microbubble encoded (TRUME) light |
| CN101486438A (en) * | 2009-03-06 | 2009-07-22 | 清华大学 | Flexible MEMS resistance reducing covering and method of manufacturing the same |
| JP2011067772A (en) * | 2009-09-26 | 2011-04-07 | Kobe Univ | Method for sterilizing water to be treated and device therefor |
| CN101984142A (en) * | 2010-11-23 | 2011-03-09 | 浙江大学 | Device for generating single-size micro nano bubbles by micro nano probe electrolysis |
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