CN112326193B - Repeatable and quantitative coating type ship streamline experimental method - Google Patents
Repeatable and quantitative coating type ship streamline experimental method Download PDFInfo
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- CN112326193B CN112326193B CN202011183072.6A CN202011183072A CN112326193B CN 112326193 B CN112326193 B CN 112326193B CN 202011183072 A CN202011183072 A CN 202011183072A CN 112326193 B CN112326193 B CN 112326193B
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- 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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- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
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Abstract
The invention belongs to the technical field of ship and ocean engineering experiments, and particularly relates to a repeatable and quantitative coating type ship streamline experimental method. The invention can effectively solve the defects of unrepeatability, erasability, incapability of quantitatively displaying the flow field and the like of the traditional coating streamline experiment. The rapid detachable navigation frame device based on the circulating water tank can simplify the experimental procedures and shorten the single experimental period; the flow field display precision can be improved by adapting reasonable coating formula to different ship speeds and attached body states of the ship model, quantitative flow field display is realized by adopting effective waterline and station number lines as scales, and flow field details are quantitatively obtained based on a regional flow line dividing mode, so that the effects of expanding the application of a coating method flow line experimental method in the flow field display aspect, and assisting in improving the ship line type and displaying the influence of the attached body structure are achieved.
Description
Technical Field
The invention belongs to the technical field of ship and ocean engineering experiments, and particularly relates to a repeatable and quantitative coating type ship streamline experimental method.
Background
The hull streamline experiment is a typical experimental means for displaying the surface water flow image when the ship sails. As one of important research contents in a conventional ship model resistance experiment, a ship flow line experiment is usually carried out aiming at a naked ship model and is used for determining the positions of attached devices such as bilge keels, bow-stern side push holes and the like. In addition, the streamline experiment is intuitive in observation, and can be used for assisting in observing some special phenomena of a flow field near the ship body, so that the line type of the ship body is researched and improved, and the flow separation and the generation of eddy are reduced.
The coating method is one of conventional ship streamline experimental methods, and forms a plurality of filamentous coating flow tracks under the action of water flow impact by depending on the flowability and the color developing effect of a special coating coated on the surface of a ship body, so that the details of a local flow field of the ship body are shown. When the formula is prepared, the coating film is ensured not to be separated by water flow due to certain adhesiveness on the surface of the ship model, and certain fluidity is maintained, so that the coating film can drag a filamentous track within limited experimental time.
The formula of the coating film is related to the navigation state of the ship, however, the conventional coating film experiment is only carried out aiming at the navigation state of a single ship model, the used coating film formula can not meet the streamline experiment requirements of the ship model under different navigation speeds and different attached body structures, and the characteristics of erasable coating streamline of the ship and quick detachable ship model can not be realized during the repeated streamline experiment of the same ship model. In addition, the conventional coating streamline experiment for displaying the flow field usually only carries out qualitative research on the flow field after pictures are taken to extract data, and quantitative refinement treatment cannot be carried out, so that the ship body fluid dynamics characteristic capability shown by the refined flow field is limited, and the engineering application of the coating streamline experiment method is greatly limited.
Disclosure of Invention
The invention aims to overcome the defects that the traditional coating streamline experiment cannot be repeated and erased and cannot quantitatively reflect the details of a ship flow field, and provides a repeatable and quantitative coating type ship streamline experiment method which can realize repeatable refined streamline experiments of the same ship model under different navigational speeds and different appendage working states.
The purpose of the invention is realized by the following technical scheme: the method comprises the following steps:
step 1: marking grid lines with station number lines and waterlines as scales on the surface of the ship model, and taking the grid lines as scales for extracting streamline quantitative data;
after the main body structure of the ship model is processed, coating primer on the designed water line, and coating background color primer for displaying the streamline under the designed water; after the primer is completely coated and fully dried, the ship model is placed on a working platform, grooves are carved according to station number lines and waterlines marked when the ship model starts to be manufactured, an oil marker pen is used for drawing fine lines along the grooves, the marks of the grooves can enable enough ink to be stored at the grid line scales to be beneficial to displaying clearness, and when the grid lines are blurred and unclear due to rubbing, the grid ink can be supplemented timely; after the grid lines are drawn, a layer of varnish protective paint is smeared on the surface of the ship model to cover the grid line printing ink, so that the phenomenon that the printing ink of the grid line scale is damaged by the erasing paint of a streamline experiment is avoided, the smoothness of the surface of the ship model is improved, and the flowing of the paint streamline and the streamline erasing during a repeated experiment are facilitated;
step 2: modulating an oil film according to the ship model navigational speed in the experimental working condition;
the oil film is prepared by blending engine oil and red alkyd ready mixed paint; taking the volume ratio of the engine oil to the red alcohol acid ready-mixed paint as 10:6 under the condition that the reduced scale navigational speed is 0.5 m/s; for the case that the reduced scale navigational speed is 1.6m/s, the volume ratio of the engine oil to the red alkyd ready-mixed paint is 10: 12; for the condition that the navigational speed is between 0.5m/s and 1.6m/s, the volume ratio of the engine oil to the red alkyd ready-mixed paint is correspondingly flexibly selected from the proportion of 10:6 to 10:12, the two materials are ensured to be fully and uniformly stirred before film coating, and the overlong standing time is avoided;
and step 3: smearing mutually parallel strip-shaped oil film coatings on the surface of the ship model along the vertical direction;
and 4, step 4: photographing and recording the state of an oil film layer of a ship model before the streamline experiment;
and 5: placing the ship model into a circulating water tank, wherein water flow in the circulating water tank is static; adjusting the draught of the ship model by adding ballast;
step 6: a group of navigation frames are respectively arranged above the front part, the middle part and the tail part of the ship model, and the navigation frames are fixed on the wall of the circulating water tank at two sides through U-shaped clamps; the front part and the tail part of the ship model are respectively provided with a group of slide rails, the middle part of the ship model is provided with two towing points, and the two towing points are connected through a steel wire rope; the front part of the ship model is provided with a front navigation rod, the upper end of the front navigation rod is fixed on a navigation frame above the front part of the ship model, and the lower end of the front navigation rod is arranged on a slide rail at the front part of the ship model; a hook is arranged on the navigation frame above the middle part of the ship model and is hung on a steel wire rope connected with a towing point; the tail part of the ship model is provided with a tail navigation rod, the upper end of the tail navigation rod is fixed on a navigation frame above the tail part of the ship model, and the lower end of the navigation rod is arranged on a slide rail at the tail part of the ship model;
and 7: starting the circulating water tank to slowly accelerate the water flow to the navigational speed corresponding to the working condition, and recording the streamline development process by using a camera through a transparent window on the side surface of the water tank;
and 8: after the streamline is stable, after enough ship model streamline photos are shot on the side surface and the bottom surface of the circulating water tank, closing the circulating water tank, lifting out the ballast, and fishing the ship model;
and step 9: placing the deck surface of the ship model at the position coated with the oil film in the step 3, shooting streamline integral photos at two sides, the front end, the rear end and above the ship bottom of the ship model, and shooting streamline details of local key focus positions;
step 10: and after the shooting work is finished, erasing the oil film coating on the surface of the ship model, and after the surface of the ship model is dried, preparing the experiment of the next working condition.
The invention has the beneficial effects that:
the invention can effectively solve the defects of unrepeatability, erasability, incapability of quantitatively displaying the flow field and the like of the traditional coating streamline experiment. The rapid detachable navigation frame device based on the circulating water tank can simplify the experimental procedures and shorten the single experimental period; the flow field display precision can be improved by adapting reasonable coating formula to different ship speeds and attached body states of the ship model, quantitative flow field display is realized by adopting effective waterline and station number lines as scales, and flow field details are quantitatively obtained based on a regional flow line dividing mode, so that the effects of expanding the application of a coating method flow line experimental method in the flow field display aspect, and assisting in improving the ship line type and displaying the influence of the attached body structure are achieved.
Drawings
FIG. 1 is a diagram showing the effect of the surface scale of the ship model.
FIG. 2(a) is a top view of the entire experimental system of the present invention.
FIG. 2(b) is a front view of the entire experimental system of the present invention.
FIG. 3 is a schematic view of quantifying streamlines in the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention belongs to the technical field of ship and ocean engineering experiments, and relates to a coating type ship streamline experimental method capable of repeatedly carrying out quantitative experiments on the same ship model. The invention aims to overcome the defects that the traditional coating streamline experiment is unrepeatable, can not be erased and can not quantitatively reflect details of a ship flow field, and provides a whole set of experimental research method which comprises the steps of manufacturing a ship model surface scale, quickly disassembling a navigation frame device, paint formula, experimental flow and quantitative post-treatment of a refined flow field, so that the repeated refined streamline experiment of the same ship model under different navigational speeds and different attached body working states can be realized.
In order to meet the requirement of the quantification of the experimental streamline, the invention carves grid lines with station number lines and waterlines as scales on the surface of the ship model when the glass fiber reinforced plastic ship model is manufactured, and the grid lines are used as scales for extracting the streamline quantification data.
Considering that the conventional towing tank has short effective towing time due to limited travel distance and has much inconvenience in loading and unloading ship models and coating oil films, the repeated streamline experiment of the invention is carried out in a circulating water tank. The simulation of the starting process of the ship model towing experiment is realized by controlling the flow velocity of the circulating water tank to accelerate from the static state to the scaled navigational speed. In order to realize repeated experiments, the navigation rod and the dragging point which are simple and easy to disassemble quickly are manufactured. In addition, the large-area transparent windows on the two sides and the bottom surface of the circulating water tank are fully utilized to record the streamline development process, the experiment duration is judged in an auxiliary mode, and the streamline unsteady development process is captured.
The invention provides a brand-new oil film formula aiming at a repeatable refined streamline experiment, the used materials are engine oil and red alkyd ready mixed paint, the viscosity of the oil film is reasonably adjusted by adjusting the proportion of two ingredients by utilizing the adhesiveness and the fluidity of the engine oil and the color rendering property of the paint, and the good streamline experiment effect of the ship model at different navigational speeds is realized.
A repeatable and quantitative coating type ship flow line experiment method comprises the following steps:
step 1: marking grid lines with station number lines and waterlines as scales on the surface of the ship model, and taking the grid lines as scales for extracting streamline quantitative data;
after the main body structure of the ship model is processed, coating primer on the designed water line, and coating background color primer for displaying the streamline under the designed water; after the primer is completely coated and fully dried, the ship model is placed on a working platform, grooves are carved according to station number lines and waterlines marked when the ship model starts to be manufactured, an oil marker pen is used for drawing fine lines along the grooves, the marks of the grooves can enable enough ink to be stored at the grid line scales to be beneficial to displaying clearness, and when the grid lines are blurred and unclear due to rubbing, the grid ink can be supplemented timely; after the grid lines are drawn, a layer of varnish protective paint is smeared on the surface of the ship model to cover the grid line printing ink, so that the phenomenon that the printing ink of the grid line scale is damaged by the erasing paint of a streamline experiment is avoided, the smoothness of the surface of the ship model is improved, and the flowing of the paint streamline and the streamline erasing during a repeated experiment are facilitated;
step 2: modulating an oil film according to the ship model navigational speed in the experimental working condition;
the oil film is prepared by blending engine oil and red alkyd ready mixed paint; taking the volume ratio of the engine oil to the red alcohol acid ready-mixed paint as 10:6 under the condition that the reduced scale navigational speed is 0.5 m/s; for the case that the reduced scale navigational speed is 1.6m/s, the volume ratio of the engine oil to the red alkyd ready-mixed paint is 10: 12; for the condition that the navigational speed is between 0.5m/s and 1.6m/s, the volume ratio of the engine oil to the red alkyd ready-mixed paint is correspondingly flexibly selected from the proportion of 10:6 to 10:12, the two materials are ensured to be fully and uniformly stirred before film coating, and the overlong standing time is avoided;
and step 3: smearing mutually parallel strip-shaped oil film coatings on the surface of the ship model along the vertical direction;
and 4, step 4: photographing and recording the state of an oil film layer of a ship model before the streamline experiment;
and 5: placing the ship model into a circulating water tank, wherein water flow in the circulating water tank is static; adjusting the draught of the ship model by adding ballast;
step 6: a group of navigation frames are respectively arranged above the front part, the middle part and the tail part of the ship model, and the navigation frames are fixed on the wall of the circulating water tank at two sides through U-shaped clamps; the front part and the tail part of the ship model are respectively provided with a group of slide rails, the middle part of the ship model is provided with two towing points, and the two towing points are connected through a steel wire rope; the front part of the ship model is provided with a front navigation rod, the upper end of the front navigation rod is fixed on a navigation frame above the front part of the ship model, and the lower end of the front navigation rod is arranged on a slide rail at the front part of the ship model; a hook is arranged on the navigation frame above the middle part of the ship model and is hung on a steel wire rope connected with a towing point; the tail part of the ship model is provided with a tail navigation rod, the upper end of the tail navigation rod is fixed on a navigation frame above the tail part of the ship model, and the lower end of the navigation rod is arranged on a slide rail at the tail part of the ship model;
and 7: starting the circulating water tank to slowly accelerate the water flow to the navigational speed corresponding to the working condition, and recording the streamline development process by using a camera through a transparent window on the side surface of the water tank;
and 8: after the streamline is stable, after enough ship model streamline photos are shot on the side surface and the bottom surface of the circulating water tank, closing the circulating water tank, lifting out the ballast, and fishing the ship model;
and step 9: placing the deck surface of the ship model at the position coated with the oil film in the step 3, shooting streamline integral photos at two sides, the front end, the rear end and above the ship bottom of the ship model, and shooting streamline details of local key focus positions;
step 10: and after the shooting work is finished, erasing the oil film coating on the surface of the ship model, and after the surface of the ship model is dried, preparing the experiment of the next working condition.
The streamline experiment intuitively shows the flowing state of the surrounding flow field of the ship model during navigation, the convergence and expansion of the streamline reflects the change of the flow velocity of the attached water flow to a certain extent, and reflects the complex turbulent flow phenomena of the attachment, separation and the like of the water flow on the surface of the ship body, therefore, the quantitative data processing of the streamline is very necessary for excavating the special flowing structure and state reflected behind the streamline.
Compared with the prior art, the invention has the beneficial effects that: the whole set of coating streamline experimental method provided by the invention can effectively overcome the defects of unrepeatability, erasability, incapability of quantitatively displaying a flow field and the like of the traditional coating streamline experiment, can simplify the experimental procedures and shorten the single experimental period by the aid of the rapid detachable navigation frame device based on the circulating water tank, can improve the display precision of the flow field by means of adapting reasonable coating formulas to different navigational speeds and appendage states of a ship model, realizes quantitative flow field display by taking effective waterlines and station lines as scales, quantitatively obtains details of the flow field based on a regional streamline flow tube dividing mode, and achieves the effects of expanding the application of the coating streamline experimental method in the aspect of flow field display and assisting in improving the line type of a ship body and displaying the influence of an appendage structure.
Example 1:
as shown in fig. 1, the method for drawing the grid lines on the surface of the ship model by the ruler is as follows: after the main body structure of the ship model is processed, the designed water line is coated with gray automobile paint with a certain thickness for multiple times to serve as primer, and white automobile primer with a certain thickness is coated under the designed water for multiple times to serve as background color for streamline display. After the primer is completely coated and fully dried, the ship model is placed on a working platform, grooves with certain depth are marked according to a plurality of station number lines and a waterline marked when the ship model starts to be manufactured by using a height ruler, fine lines with certain width are marked along the grooves by using a black oil marker pen, the marks of the grooves can enable enough ink to be stored at the rulers of the grid lines, so that the grid lines can be displayed clearly, and the grid ink can be supplemented timely according to the marks when the grid lines are blurred and unclear due to scraping and rubbing. After the grid lines are drawn, a layer of automobile gloss oil protective paint is smeared on the surface of the ship model to cover the grid line printing ink, so that the phenomenon that the printing ink is damaged by the wiping of the streamline experiment is avoided, the smoothness of the surface of the ship model is increased to a certain extent, and the flowing of the painting streamline and the wiping of the streamline during the repeated experiment are facilitated.
As shown in fig. 2(a) and 2(b), the rapid detachable navigation frame device manufactured based on the circulating water tank of the invention comprises a navigation frame 2 laid on a steel rail 1 at the edge of the water tank, a slide rail 3 and a slide rail 7 fixed on a ship model 4, a towing point 5 fixed on the ship model 1, a hook 6, a navigation rod 8 fixed on the navigation frame 2 through double nuts and the like, wherein the main processing raw materials of the device are angle iron and a screw rod. During the experiment, the ship model coated with the oil film is placed in the static water flow of the water tank, the draught of the ship model is adjusted by adding ballast, the head and tail navigation rods penetrate through the supports on the ship model, the hook 6 is hung at the steel wire rope 9 connected with the towing point, and then the three navigation frames are fixed at the tank walls on the two sides of the water tank through the U-shaped clamps. The simple device can fully release the heave, surging and pitching motion of the ship model during the streamline experiment.
The oil film formula of the coating streamline experiment is prepared by mixing engine oil and red alkyd ready-mixed paint, and the volume ratio is adopted for preparing the two materials which are both liquid. In order to avoid the influence on the streamline effect caused by the long-term drying of the prepared oil film, the oil film material is prepared before the oil film is coated on the ship model in each streamline. In order to achieve a high-quality streamline experimental result, different oil film formulas are selected according to different navigational speeds, the volume ratio of the engine oil to the red alcohol acid ready-mixed paint is correspondingly 10:6 under the condition that the reduced scale navigational speed is 0.5m/s, the volume ratio of the engine oil to the red alcohol acid ready-mixed paint is correspondingly 10:12 under the condition that the reduced scale navigational speed is 1.6m/s, the volume ratio of the engine oil to the red alcohol acid ready-mixed paint is correspondingly flexibly selected from 10:6 to 10:12 under the condition that the navigational speed is 0.5m/s to 1.6m/s, the two materials are guaranteed to be fully and uniformly stirred before film coating, and the standing time is prevented from being too long.
Before the experiment, the measurement and calculation work of parameters such as ballast weight, ballast position and the like needs to be carried out on the ship model, and the specific operation flow of the experiment is as follows: placing a ship model deck reference plane on the surface of a working platform. Secondly, a specific oil film formula is modulated and uniformly mixed according to the ship model navigational speed in the experimental working condition. And smearing mutually parallel strip-shaped oil film coatings on the surface of the ship model along the vertical direction. And fourthly, photographing and recording the state of the oil film layer of the ship model before the streamline experiment. Hoisting the ship model to launch, and adding ballast to adjust draft. And sixthly, installing and fixing devices such as a navigation frame. And seventhly, starting a circulating water tank to slowly accelerate the water flow to a working condition corresponding to the navigational speed to start an experiment, and simultaneously recording the streamline development process by using a camera through a transparent window on the side surface of the water tank. And eighthly, after the streamline is stabilized, shooting sufficient ship model streamline photos on the side surface and the bottom surface of the water tank, closing the flow speed of the circulating water tank, lifting out the ballast, and fishing the ship model. Ninthly, placing the ship model deck surface at the ship model position before smearing the oil film, shooting the whole picture of the flow line above two sides, the front end, the rear end and the ship bottom by using the camera, and shooting the flow line details of the local important attention position. And (E) determining that the shooting work is finished at the salt part, adopting cleaning cloth and paper towel to match with clean water and alcohol, timely erasing an oil film coating on the surface of the ship model, and after the surface of the ship model is dried. Experiments for the next condition were prepared. The width of the coated strip-shaped oil film strip is about 10mm, and the interval along the length direction of the ship is about 80 mm.
The invention carries out quantitative processing according to station number lines and waterline grid scales aiming at the obtained streamline result, and the post-processing effect is shown in figure 3. According to the characteristics of the surface streamline flow characteristics of the ship model, the ship side is divided into A, B, C three areas according to different sources according to the flow pipe concept, and the ship bottom is divided into D, E two characteristic areas. The width of the area along the ship height direction is determined by the width occupied by the beam line at the station mark position, the width of the flow tube is represented in the figure by the width of a bar graph, and the whole trend of the beam line is determined by the connection line of the width center position of the flow tube along the ship length direction. The trend and the rule of the surface streamline of the ship model can be judged through the quantitative subarea data, and the change condition of the density of the flow line in the flow pipe along the flow direction can be obtained according to the number of the streamline in the area. The contraction of the width of the flow tube represented by the bar graph along the flow direction indicates that the flow lines converge, the flow accelerates and flow separation phenomena can occur; the expansion of the width of the flow tube in the direction of flow represented by the bar graph indicates that the streamlines diverge, corresponding to fluid deceleration and potentially regional fluid reattachment. It can be judged from the quantified data that the ship side a area flow and the ship side B area flow line respectively flow into the ship bottom E area and the ship bottom D area through the ship side, and the ship side C area flow line starts from the ship side and ends when reaching the side of the stern.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A repeatable and quantitative coating type ship flow line experimental method is characterized in that: the method comprises the following steps:
step 1: marking grid lines with station number lines and waterlines as scales on the surface of the ship model, and taking the grid lines as scales for extracting streamline quantitative data;
after the main body structure of the ship model is processed, coating primer on the designed water line, and coating background color primer for displaying the streamline below the designed water line; after the primer is completely coated and fully dried, the ship model is placed on a working platform, grooves are carved according to station number lines and waterlines marked when the ship model starts to be manufactured, an oil marker pen is used for drawing fine lines along the grooves, the groove marks can enable enough ink to be stored in grid line scales to facilitate clear streamline display, and when grid lines are blurred and not clear due to rubbing, grid ink can be supplemented in time; after the grid lines are drawn, a layer of varnish protective paint is smeared on the surface of the ship model to cover the grid line scale ink, so that the damage of the grid line scale ink caused by the paint erased in a streamline experiment is avoided, the smoothness of the surface of the ship model is improved, and the flowing of the paint streamline and the streamline erasing in a repeated experiment are facilitated;
step 2: modulating an oil film according to the ship model navigational speed in the experimental working condition;
the oil film is prepared by blending engine oil and red alkyd ready mixed paint; taking the volume ratio of the engine oil to the red alcohol acid ready-mixed paint as 10:6 under the condition that the reduced scale navigational speed is 0.5 m/s; for the case that the reduced scale navigational speed is 1.6m/s, the volume ratio of the engine oil to the red alkyd ready-mixed paint is 10: 12; for the condition that the scaling speed is between 0.5m/s and 1.6m/s, the volume ratio of the engine oil to the red alkyd ready-mixed paint is correspondingly flexibly selected from the ratio of 10:6 to 10:12, the two materials are fully and uniformly stirred before film coating, and the overlong standing time is avoided;
and step 3: smearing mutually parallel strip-shaped oil film coatings on the surface of the ship model along the vertical direction;
and 4, step 4: photographing and recording the state of an oil film coating of the ship model before the streamline experiment;
and 5: placing the ship model into a circulating water tank, wherein water flow in the circulating water tank is static; adjusting the draught of the ship model by adding ballast;
step 6: a group of navigation frames are respectively arranged above the front part, the middle part and the tail part of the ship model, and the navigation frames are fixed on the wall of the circulating water tank at two sides through U-shaped clamps; the front part and the tail part of the ship model are respectively provided with a group of slide rails, the middle part of the ship model is provided with two towing points, and the two towing points are connected through a steel wire rope; the front part of the ship model is provided with a front navigation rod, the upper end of the front navigation rod is fixed on a navigation frame above the front part of the ship model, and the lower end of the front navigation rod is arranged on a slide rail at the front part of the ship model; a hook is arranged on the navigation frame above the middle part of the ship model and is hung on a steel wire rope connected with a towing point; the tail part of the ship model is provided with a tail navigation rod, the upper end of the tail navigation rod is fixed on a navigation frame above the tail part of the ship model, and the lower end of the navigation rod is arranged on a slide rail at the tail part of the ship model;
and 7: starting the circulating water tank to slowly accelerate the water flow to the navigational speed corresponding to the working condition, and recording the streamline development process by using cameras through the side surface and bottom surface transparent windows of the water tank;
and 8: after the streamline is stable, after enough ship model streamline photos are shot on the side surface and the bottom surface of the circulating water tank, closing the circulating water tank, lifting out the ballast, and fishing the ship model;
and step 9: placing the deck surface of the ship model at the position where the oil film coating is coated in the step 3, shooting streamline overall photos at two sides, the front end, the rear end and above the ship bottom of the ship model, and shooting streamline details of local key focus positions;
step 10: and after the shooting work is finished, erasing the oil film coating on the surface of the ship model, and after the surface of the ship model is dried, preparing the experiment of the next working condition.
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| US4915048A (en) * | 1987-04-28 | 1990-04-10 | Corwin R. Horton | Vessel with improved hydrodynamic performance |
| CN102323035B (en) * | 2011-06-01 | 2013-08-28 | 哈尔滨工程大学 | Local cabin section model for ship impact resistance test |
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