CN110803266A - Method and device for measuring bow bubble sweep phenomenon - Google Patents
Method and device for measuring bow bubble sweep phenomenon Download PDFInfo
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- CN110803266A CN110803266A CN201911109966.8A CN201911109966A CN110803266A CN 110803266 A CN110803266 A CN 110803266A CN 201911109966 A CN201911109966 A CN 201911109966A CN 110803266 A CN110803266 A CN 110803266A
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Abstract
The invention provides a method and a device for measuring the downward sweeping phenomenon of bubbles on a ship bow. Starting the bubble generator, and stopping the bubble generator when micro bubbles are fully distributed on the surface of the towing tank; starting a wave generator, inputting a given test working condition, and generating a required waveform; when the trailer enters a constant-speed section, a PIV camera of the PIV system starts to shoot and record a bubble field around the bow; and (4) importing the pictures shot by the PIV camera into post-processing software, and calculating flow field information of bubbles around the flow field around the bow. The invention improves the test simplicity to a certain extent, is easy to maintain, is simple and convenient to operate and has high use efficiency.
Description
Technical Field
The invention belongs to the technical field of ship hydrodynamic tests, and particularly relates to a method and a device for measuring a bow bubble sweep phenomenon.
Background
In a natural state, a part of air is dissolved in seawater due to wave breaking and rain impact, and therefore, a bubble layer exists in seawater near the sea level. In the sailing process of the ship, the interaction between the bow and the waves causes the vortex, so that the bubble layer on the surface of the ocean is sucked under the bow, and the phenomenon of downward sweeping of bubbles is formed. If there are air bubbles below the sonar area at the bottom of the ship, the sound waves may be strongly destroyed (reflected or absorbed). This phenomenon has affected the accuracy of acoustic surveys for many years and remains a significant problem to date. Therefore, the method has great significance for the research of the bubble sweep-down phenomenon. At present, when people test the phenomenon of downward air bubble sweeping, the traditional flow line analysis method is mostly adopted for measurement. Because the bubbles and the streamline have different physical characteristics, the streamline test has larger error, and the phenomenon of downward sweeping of the bubbles cannot be accurately measured. The invention improves the traditional streamline test method, and realizes the measurement of the phenomenon of downward sweeping of bubbles in the pool test by adding the bubbles into the pool.
Disclosure of Invention
The invention aims to provide a method for measuring a bow bubble sweep phenomenon.
The purpose of the invention is realized as follows:
a measuring method for a bow bubble sweep phenomenon comprises the following specific implementation steps:
step 6, changing the navigational speed, the wave height wavelength and the size and the thickness of the bubbles in the bubble layer, and repeating the operations from the step 4 to the step 5 until all given test working conditions are completed;
and 7, importing the pictures shot by the PIV camera 9 of the PIV system into post-processing software, and calculating flow field information of bubbles around the flow field around the bow.
The invention also aims to provide a device for measuring the bow bubble sweep phenomenon.
The purpose of the invention is realized by the following technical scheme:
a measuring device for a bow bubble downward-sweeping phenomenon is characterized in that trailer tracks 11 are arranged on two sides of a towing tank 1, a trailer and an auxiliary trolley 3 are arranged on the trailer tracks 11 respectively, a wave generator 2 is arranged on one side of the towing tank 1, a ship model 7 and a PIV camera 9 are connected to the trailer through a connecting frame 10, a lens of the PIV camera 9 is aligned to the bow part of the ship model 7, a bubble generator 4, a wave height indicator 5 and a PIV laser 6 are arranged on the auxiliary trolley 3, and the PIV laser 6 is aligned to the bow part of the ship model 7.
And orange-red fluorescent paint is sprayed on the bow part of the ship model 7.
The PIV laser 6 can move horizontally on the auxiliary trolley 3.
The auxiliary trolley 3, the wave generator 2 and the trailer are respectively connected with a control system of a computer.
The invention has the beneficial effects that: the invention adopts a water electrolysis mode to generate micro bubbles, and then uses the micro bubbles as tracer particles for PIV measurement; when a PIV camera is used for observing the downward sweeping phenomenon of bubbles on the bow, PIV post-processing software is used for measuring flow field information around the bow; the method can well observe the motion track of the lower scavenging bubble, simultaneously can save the process of particle scattering required by the conventional PIV test, improves the test simplicity to a certain extent, and can be used for researching various motion characteristics of the flow field around the bow of the ship by combining other auxiliary measurement systems; through observation of the lower scavenging bubble group, various characteristics of the micro bubbles in the water can be understood, and the method has important experimental significance; in addition, all related instruments are arranged on the trailer or the auxiliary trolley, so that each module is convenient to operate and easy to maintain, and each part can be conveniently replaced and maintained; has the advantages of simple operation and high use efficiency.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is an overall installation view of all the test devices.
FIG. 3 is a partial enlarged view of the wave generator and the auxiliary trolley.
Fig. 4 is a schematic view of a PIV camera observation ship model.
Detailed Description
The invention is further described with reference to the accompanying drawings in which:
example 1
The invention aims to provide a measuring method for a bow bubble sweep phenomenon.
As shown in fig. 1 and 2, the present invention comprises a towing tank 1, a wave generator 2, a bubble generator 4, a wave height gauge 5 and PIV accessories, including a laser 6 and a high-speed camera 9. The ship model 7 and PIV high speed camera 9 used for the test are connected to the trailer system by a connection frame 10. The bubble generator 4, the wave height gauge 5 and the PIV laser 6 are mounted on the auxiliary trolley 3. The auxiliary trolley 3 and the trailer share a rail 11 on which they can be moved by means of a control system. The bubble generator 4 has 4 groups, and the size of bubbles generated by the electrolyzed water can be controlled by adjusting the output voltage value of the power supply. The wave maker 1 generates irregular waves, and the accuracy of the generated waves is verified by the wave height instrument 5. The laser 6 and the high-speed camera 9 form a PIV system, the laser emits laser from the right front of a ship model 7 used for testing to form a high-speed camera shooting plane 8, and a side section with a ship bow is illuminated, so that the high-speed camera 9 can observe the condition that bubbles sweep downwards.
The technical scheme adopted by the invention for solving the technical problems is as follows: a measuring method for bow bubble sweep phenomenon comprises the following operation steps:
firstly, performing paint spraying treatment on the surface of a bow of a ship model; spraying orange-red fluorescent paint to the bow part of the ship model; the paint is beneficial to reducing the reflection phenomenon of laser when a PIV test is carried out, so that the flow field phenomenon at the boundary of a ship model and water is more accurate when post-treatment is carried out;
secondly, hoisting the ship model into a towing tank dock; weights are put into the ship model, so that the draught, the floating state and the like of the ship model meet the test requirements;
thirdly, connecting the ship model to a connecting rod of the pool trailer;
fourthly, calibrating the PIV system by using a calibration device;
fifthly, debugging the laser system of the PIV; completing the early preparation of the test;
starting the water electrolysis device to generate micro bubbles; stopping the electrolysis device when the micro bubbles are fully distributed on the surface of the towing tank;
starting the pool wave making machine, inputting given test working conditions and generating required waveforms;
starting the trailer and starting a first test working condition;
when the trailer enters a constant speed section, the PIV testing system starts to shoot and record a bubble field around the bow of the ship;
step ten, the trailer reaches the other end of the water pool, a brake system is started, and the trailer is stopped;
replacing working conditions such as navigational speed, wave height wavelength, bubble size and thickness in a bubble layer and the like, and repeating the operations from the sixth step to the tenth step until all given test working conditions are completed;
and step ten, importing the pictures shot by the PIV camera into post-processing software to obtain flow field information such as the speed and pressure of bubbles around the flow field around the bow.
The invention also comprises some features as follows:
the bubble generator comprises a pair of electrodes and a power supply for controlling the discharge of the electrodes, and the diameter of bubbles generated by the electrolyzed water can be controlled by adjusting the output voltage of the power supply. The bubble generator is connected with the control power supply, and the size of bubbles generated by the electrolyzed water can be adjusted by adjusting a given voltage value, so that the bubble size required by a bubble sweep-down test is adjusted.
The PIV equipment comprises a high-speed camera arranged on a trailer and a laser arranged in front of a wave maker. The laser generates a laser beam section in the same direction as the trailer advances, thereby illuminating a side section of the ship model, and then the high-speed camera shoots and records the air bubble sweep-down condition of the section. The wave height instrument is used for collecting the wave change condition caused by the wave making of the wave making machine.
The high-speed camera of the PIV measuring system is connected with the water tank trailer through the connecting frame made of aluminum alloy, and in addition, a reinforcing connecting piece is arranged between the high-speed camera and the connecting frame, so that the instrument is prevented from being damaged due to separation caused by insufficient supporting force during high-speed movement.
The bubble generator, the wave height instrument and the laser are arranged on an auxiliary trolley, and the trolley can move, so that bubbles are generated at any position of the water pool, the bubble diffusion speed is accelerated, and the early-stage preparation time of the test is shortened.
The laser can move horizontally to adjust the position of the side face of the illuminated ship model, so that the phenomenon of downward scanning of bubbles at different plane positions can be observed through the camera.
The PIV system comprises a high-speed camera arranged on the side face of the trailer and a laser source arranged right in front of the wave maker. The laser illuminates a side section with the bow from directly in front of the ship model used for the test, so that the PIV camera can observe the condition of the downward sweeping of the bubbles.
The wave generator is connected with the control computer, so that irregular waves experienced by the ship model during navigation can be generated, and the phenomenon of downward sweeping of bubbles is generated by interaction between the irregular waves and the bow.
The invention discloses a measuring method for a bow bubble sweep phenomenon. The test method is suitable for the towing tank, and combines the bubble generation system and the PIV test system to measure the bubble sweep phenomenon of the bow. The required test equipment comprises a water tank trailer, a wave maker, a bubble generator, a wave height gauge and PIV supporting equipment. The bubble generator comprises a pair of electrodes and a power supply for controlling the discharge of the electrodes, and the diameter of bubbles generated by electrolyzed water can be controlled by adjusting the output voltage of the power supply, so that the bubble size required by a test is generated. The PIV equipment comprises a high-speed camera arranged on a trailer and a laser arranged in front of a wave maker. The laser generates a laser beam section which is the same as the advancing direction of the trailer, so that a side section of the bow is illuminated, and the high-speed camera shoots and records the downward scanning condition of the bubble of the section. The trailer, the wave maker and the wave height gauge belong to towing tank adaptation equipment, and the movement of the ship model under the given wave working condition is realized. The invention is suitable for towing a pool, so that the working condition of waves with bubble layers is generated in the pool, and the PIV and other auxiliary measuring systems are further adopted to measure the bubble sweep-down characteristic of the bow. Has the characteristics of simple operation and high use efficiency.
Claims (5)
1. A method for measuring a bow bubble sweep phenomenon is characterized by comprising the following specific implementation steps:
step 1, performing paint spraying treatment on the surface of a bow of a ship model (7);
step 2, trailer tracks (11) are arranged on two sides of the towing tank (1), a trailer and an auxiliary trolley (3) are arranged on the trailer tracks (11), a wave generator (2) is arranged on one side of the towing tank (1), a ship model (7) and a PIV camera (9) are connected to the trailer through a connecting frame (10), a lens of the PIV camera (9) is aligned to the bow part of the ship model (7), a bubble generator (4), a wave height gauge (5) and a PIV laser (6) are arranged on the auxiliary trolley (3), the PIV laser (6) is aligned to the bow part of the ship model (7), and weights are placed in the ship model (7) to enable the draught state and the floating state of the ship model to meet the test requirements;
step 3, calibrating the PIV system by using a calibration device, and debugging a PIV laser (6) of the PIV system;
step 4, starting the bubble generator (4), and stopping the operation of the bubble generator (4) when the micro bubbles are fully distributed on the surface of the towing tank; starting the wave generator (2), inputting a given test working condition, and generating a required waveform;
step 5, starting the trailer, when the trailer enters the constant speed section, starting a PIV camera (9) of the PIV system to shoot and record a bubble field around the bow, and when the trailer reaches the other end of the towing tank (1), starting a brake system and stopping the trailer;
step 6, changing the navigational speed, the wave height wavelength and the size and the thickness of the bubbles in the bubble layer, and repeating the operations from the step 4 to the step 5 until all given test working conditions are completed;
and 7, introducing pictures shot by a PIV camera (9) of the PIV system into post-processing software, and calculating flow field information of bubbles around the flow field around the bow.
2. The utility model provides a device for ship bow bubble is swept phenomenon measurement down, trailer track (11) are installed to the both sides of towing tank (1), have trailer and auxiliary trolley (3) on trailer track (11) respectively, and wave making machine (2) are installed in towing tank (1) one side, its characterized in that: the ship model (7) and the PIV camera (9) are connected to the trailer through a connecting frame (10), a lens of the PIV camera (9) is aligned to the bow part of the ship model (7), the bubble generator (4), the wave height gauge (5) and the PIV laser (6) are installed on the auxiliary trolley (3), and the PIV laser (6) is aligned to the bow part of the ship model (7).
3. The apparatus for measuring bow bubble sweep phenomenon according to claim 2, wherein: and orange-red fluorescent paint is sprayed on the bow part of the ship model (7).
4. The apparatus for measuring bow bubble sweep phenomenon according to claim 2, wherein: the PIV laser (6) can move horizontally on the auxiliary trolley (3).
5. The apparatus for measuring bow bubble sweep phenomenon according to claim 2, wherein: the auxiliary trolley (3), the wave generator (2) and the trailer are respectively connected with a control system of a computer.
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| CN201911109966.8A CN110803266B (en) | 2019-11-14 | 2019-11-14 | Method and device for measuring bow bubble sweep phenomenon |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112109859A (en) * | 2020-09-25 | 2020-12-22 | 哈尔滨工程大学 | Experimental system for simulating ship bottom bubble transportation environment through artificial ventilation method |
| CN112498605A (en) * | 2020-11-17 | 2021-03-16 | 哈尔滨工程大学 | Dam break type on-board wave simulation test device |
| CN112504626A (en) * | 2020-11-18 | 2021-03-16 | 哈尔滨工程大学 | Bubble tracer particle PIV experimental apparatus |
| RU2765518C1 (en) * | 2021-05-21 | 2022-01-31 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Калининградский государственный технический университет" | Method for determining shape of ship hull fore end |
| CN114508655A (en) * | 2021-12-31 | 2022-05-17 | 重庆交通大学 | Multifunctional measuring frame suitable for indoor water tank test and flow measuring method |
| CN114577437A (en) * | 2022-02-15 | 2022-06-03 | 哈尔滨工程大学 | Gas-liquid two-phase flow bubble measuring device |
| CN117804733A (en) * | 2024-03-01 | 2024-04-02 | 中国空气动力研究与发展中心低速空气动力研究所 | Wall turbulence boundary layer test device for generating space-time evolution |
| BE1030909B1 (en) * | 2022-09-23 | 2024-04-22 | Univ Dalian Maritime | A deployed wave fragmentation simulation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112109859A (en) * | 2020-09-25 | 2020-12-22 | 哈尔滨工程大学 | Experimental system for simulating ship bottom bubble transportation environment through artificial ventilation method |
| CN112498605A (en) * | 2020-11-17 | 2021-03-16 | 哈尔滨工程大学 | Dam break type on-board wave simulation test device |
| CN112504626A (en) * | 2020-11-18 | 2021-03-16 | 哈尔滨工程大学 | Bubble tracer particle PIV experimental apparatus |
| RU2765518C1 (en) * | 2021-05-21 | 2022-01-31 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Калининградский государственный технический университет" | Method for determining shape of ship hull fore end |
| CN114508655A (en) * | 2021-12-31 | 2022-05-17 | 重庆交通大学 | Multifunctional measuring frame suitable for indoor water tank test and flow measuring method |
| CN114508655B (en) * | 2021-12-31 | 2024-02-20 | 重庆交通大学 | Multifunctional measuring frame and flow measuring method suitable for indoor water tank test |
| CN114577437A (en) * | 2022-02-15 | 2022-06-03 | 哈尔滨工程大学 | Gas-liquid two-phase flow bubble measuring device |
| BE1030909B1 (en) * | 2022-09-23 | 2024-04-22 | Univ Dalian Maritime | A deployed wave fragmentation simulation system |
| CN117804733A (en) * | 2024-03-01 | 2024-04-02 | 中国空气动力研究与发展中心低速空气动力研究所 | Wall turbulence boundary layer test device for generating space-time evolution |
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