An experimental device and method for studying the cooling effect of storage tank water

Abstract

The present invention discloses an experimental device and method for studying the water cooling effect of a storage tank. This scheme simulates the actual surface of the storage tank and forms a falling liquid film by a water jet hitting the wall. On this basis, experimental data such as the wall temperature, liquid film thickness, liquid film width, radiation heat flux intensity, and liquid film flow rate at different positions are simultaneously obtained. Such experimental data can be used to study the water cooling protection mechanism of oil and gas storage tanks under fire environments, and to evaluate the cooling effects of fire water cannons, fire water guns, and fixed water sprinkler systems. This scheme can well simulate the flow of cooling water liquid film on the surface of the storage tank under a real fire environment, and can accurately measure the relevant dimensions of the formed liquid film, thereby ensuring the accuracy of the experimental results of the water cooling effect of the storage tank.

Description

Technical Field

[0001] The invention relates to a passive or active safety protection technology for a storage tank, and in particular to an experimental technology for the water cooling effect of a storage tank. Background Art

[0002] Water cooling is one of the main protective methods to prevent the failure of nearby storage tanks in the fire scene during emergency rescue. Water cooling means that cooling water falls along the surface of the tank wall under the action of gravity to form a water film to weaken the thermal radiation received by the tank wall, and at the same time removes the heat from the surface of the tank wall through heat transfer, thereby protecting the tank.

[0003] According to the different release devices, water cooling is divided into mobile type, such as fire water cannon; fixed type, such as fixed water sprinkler system. When firefighters are extinguishing oil and gas tank fires, they often use mobile water cooling methods to cool and protect adjacent tanks to avoid chain spread of fire between the burning tank and the adjacent tanks. Since the flow and heat exchange of the cooling water film have an important influence on the cooling effect, the focus of the study of water cooling protection mechanism is to master the flow characteristics of the cooling water film and its coupled heat transfer characteristics. However, the current fire protection regulations have very few instructions for water cooling of adjacent tanks in fire scenarios, and fire rescue teams often determine fire fighting and rescue parameters such as water supply intensity through experience summary.

[0004] Therefore, it is of great academic significance and engineering application value to study the flow characteristics of the cooling water film descending along the tank wall and its coupled heat transfer characteristics, reveal the water cooling protection mechanism of oil and gas storage tanks under fire environment, and establish a corresponding water cooling effect evaluation model.

[0005] At present, most of the research on falling liquid film focuses on the falling film on circular tubes, while the limited flat plate falling film experiments are mostly carried out under small-scale and low Reynolds number conditions. Under these conditions, the development of the liquid film may be limited, which is quite different from the flow conditions of the cooling water film on the surface of the tank under actual fire environment.

[0006] The thickness of the liquid film formed by cooling water on the tank wall surface is a key parameter used to study the water cooling protection mechanism of oil and gas storage tanks and evaluate the water cooling effect.

[0007] The existing solutions for measuring the thickness of liquid film mainly adopt mechanical direct measurement method, electrical method, capacitance method, acoustic method and other measurement technologies. Such solutions have the following shortcomings:

[0008] Mechanical direct measurement method: First, there are errors caused by the mechanical measurement method; second, the probe must be placed in front of the metal plate and requires manual operation, which will not only affect the water gun spray, but also affect the heat transfer between the fire source and the metal plate;

[0009] Electrical method: When the thickness of the liquid film increases to a certain extent, the change in the thickness of the liquid film is unlikely to cause changes in parameters such as conductivity and capacitance. Therefore, the accuracy of the electrical method will be lower when the liquid film is thicker;

[0010] Capacitance method: The capacitance method is greatly affected by temperature, which makes it difficult to calibrate and is not suitable for experiments with fire sources.

[0011] Acoustic method: The equipment involved in the acoustic method is extremely expensive and has poor economic efficiency. In addition, ultrasonic waves cannot effectively penetrate metal plates, so the overall practicality is very poor. Summary of the invention

[0012] In view of the problem that the size of the liquid film cannot be effectively measured in the existing descending liquid film related experimental schemes, the purpose of the present invention is to provide an experimental scheme for studying the water cooling effect of the storage tank, which can well simulate the flow of the cooling water film on the surface of the storage tank under the actual fire environment, and can accurately measure the relevant dimensions of the formed liquid film, so as to ensure the accuracy of the experimental results of the water cooling effect of the storage tank.

[0013] In order to achieve the above object, the present invention provides an experimental device for studying the water cooling effect of a storage tank, the experimental device comprising a tank wall simulation system, a measurement system, a liquid film identification system, a water source system and a fire source system;

[0014] The tank wall simulation system is mainly composed of a non-curvature steel plate to simulate the tank wall structure;

[0015] The water source system is arranged corresponding to the non-curvature steel plate in the tank wall simulation system, and can spray cooling water to the non-curvature steel plate in the tank wall simulation system, so that the cooling water can descend along the non-curvature steel plate to form a liquid film, and the liquid film state can be adjusted by adjusting the cooling water spraying state;

[0016] The fire source system is set corresponding to the non-curvature steel plate in the tank wall simulation system, so that the generated heat radiation acts on the liquid film on the non-curvature steel plate;

[0017] The measurement system corresponds to the non-curvature steel plate in the tank wall simulation system and is configured to collect the flow rate of cooling water on the non-curvature steel plate, the surface temperature of the non-curvature steel plate, and the radiant heat intensity generated by the fire source system relative to the non-curvature steel plate;

[0018] The liquid film recognition system corresponds to the curvature-free steel plate setting in the tank wall simulation system, and is configured to act synchronously with the measurement system. The liquid film recognition system is configured to make the liquid film formed along the descending curvature-free steel plate fluorescent, and obtain the morphological image of the liquid film formed on the curvature-free steel plate based on the fluorescent signal generated by the liquid film, and then identify the thickness and width of the liquid film formed on the curvature-free steel plate, as well as the flow field distribution of the liquid film based on the morphological image of the liquid film.

[0019] In some embodiments of the present invention, the tank wall simulation system further includes a bracket, and the bracket is arranged in cooperation with the non-curvature steel plate to form a vertical support for the non-curvature steel plate.

[0020] In some embodiments of the present invention, the measurement system includes a flow rate sensor, a thermocouple, a radiation heat flux meter and a data acquisition instrument. The flow rate sensor and the thermocouple are correspondingly arranged on the surface of the non-curvature steel plate facing the cooling water; the radiation heat flux meter is set corresponding to the fire source system; and the data acquisition instrument is respectively connected to the flow rate sensor, the thermocouple and the radiation heat flux meter.

[0021] In some embodiments of the present invention, the liquid film recognition system includes a laser, a high-speed camera and an image processing module. The laser is arranged on the side of the non-curved steel plate and is configured to effectively irradiate the liquid film formed along the descending of the non-curved steel plate, so that the entire liquid film is in a fluorescent state; the high-speed camera is cooperatively arranged on the side of the non-curved steel plate and in front of the non-curved steel plate meeting the cooling water surface, and obtains the morphological image of the liquid film formed on the non-curved steel plate based on the fluorescent signal generated by the liquid film; the image processing module connects the laser and the high-speed camera, and is configured to be able to calculate and identify the actual thickness, width and flow field distribution of the liquid film based on the generated liquid film morphological image.

[0022] In some embodiments of the present invention, the water source system includes a water tank, a water pump and a cooling water release device. The water outlet end of the cooling water release device is arranged facing the non-curvature steel plate in the tank wall simulation system, and the water inlet end is connected to the water tank through a water pump. The cooling water release device is configured to spray cooling water towards the non-curvature steel plate at different angles, distances and / or flow rates.

[0023] In some embodiments of the present invention, the fire source system consists of combustibles, an oil pan, and a scale.

[0024] In order to achieve the above object, the present invention provides an experimental method for studying the cooling effect of water in a storage tank, the experimental method comprising:

[0025] Use non-curvature steel plates to simulate the wall of oil and gas storage tanks;

[0026] Cooling water is sprayed toward the non-curved steel plate to form liquid films of different thicknesses and widths; at the same time, heat radiation is generated and acts on the liquid film on the non-curved steel plate;

[0027] The surface temperature and radiation heat intensity of the curvature-free steel plate are obtained in real time; and the liquid film formed along the curvature-free steel plate is simultaneously made to be in a fluorescent state, and then the morphological image of the liquid film formed on the curvature-free steel plate is obtained based on the fluorescent signal generated by the liquid film;

[0028] The actual thickness, width and flow field distribution of the liquid film are calculated and identified based on the generated liquid film morphology image.

[0029] In some embodiments of the present invention, when spraying cooling water onto the curvature-free steel plate, the experimental method sprays cooling water onto the curvature-free steel plate at different angles, distances and / or flow rates to form liquid films of different thicknesses and widths.

[0030] In some embodiments of the present invention, the experimental method uses a laser to irradiate the liquid film formed along the descending steel plate without curvature, so that the entire liquid film is in a fluorescent state, and then uses a high-speed camera to sense the fluorescent signal generated by the liquid film to obtain a morphological image of the liquid film formed on the steel plate without curvature, and then calculates and identifies the actual thickness, width and flow field distribution of the liquid film based on the generated liquid film morphological image.

[0031] In some embodiments of the present invention, the experimental method generates thermal radiation by burning combustibles, and simultaneously measures the mass loss of the combustibles during the combustion process, and determines the heat release rate of the fire source based on the mass loss.

[0032] The experimental device scheme for studying the water cooling effect of storage tanks provided by the present invention can well simulate the water cooling state of oil and gas storage tanks under a fire environment, and can accurately simulate the flow of cooling water film on the surface of the storage tank under a real fire environment. On this basis, the wall temperature, liquid film thickness, liquid film width, radiation heat flux intensity, liquid film flow rate, and water cooling protection mechanism can be simultaneously obtained, so that the data generated by the experiment can accurately evaluate the cooling effect of fire water monitors, fire water guns, and fixed water sprinkler systems under fire conditions, and provide scientific guidance for fire rescue teams to extinguish oil and gas storage tank fires. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Figure 1 This is a diagram showing an example of the structure of an experimental device used to study the cooling effect of water in a storage tank in the present invention;

[0035] Figure 2 This is an example diagram of the tank wall simulation system in the present invention;

[0036] Figure 3 This is an example diagram of the structure of a steel plate without curvature in the present invention;

[0037] Figure 4 This is an example diagram of the composition of the measurement system in the present invention;

[0038] Figure 5 This is an example diagram of installing the flow velocity sensor in a non-curvature steel plate in the present invention;

[0039] Figure 6This is an example diagram of the composition of the fire source system in the present invention. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific diagrams.

[0041] At present, fire protection regulations provide very few instructions for water cooling of nearby storage tanks in fire scenarios. Fire rescue teams often determine firefighting and rescue parameters such as water supply intensity through experience summary. There is a lack of relevant experimental and theoretical research on the water cooling protection mechanism of oil and gas storage tanks in fire environments.

[0042] In this regard, the present invention provides an experimental device for studying the water cooling effect of storage tanks. The experimental device simulates the actual storage tank surface and forms a falling liquid film by water jets hitting the wall. On this basis, the experimental data such as wall temperature, liquid film thickness, liquid film width, radiation heat flux intensity, and liquid film flow rate at different positions are simultaneously obtained. Such experimental data can be used to study the water cooling protection mechanism of oil and gas storage tanks under fire environments and evaluate the cooling effect of fire water monitors, fire water guns, and fixed water sprinkler systems.

[0043] See also Figure 1 , which shows an example of the structure of an experimental device provided by the present invention for studying the water cooling effect of a storage tank.

[0044] As shown in the figure, the experimental device 100 for studying the water cooling effect of a storage tank provided by the present invention mainly comprises five components, namely a tank wall simulation system 110, a measurement system 120, a liquid film identification system 130, a water source system 140 and a fire source system 160.

[0045] The tank wall simulation system 110 is specifically implemented by a non-curvature steel plate 111 , which is vertically distributed and can effectively simulate the tank wall structure, especially the surface of the storage tank.

[0046] In coordination with this, the water source system 140 in this experimental device is specifically distributed corresponding to the curvature-free steel plate 111, so that the water spraying direction of the water source system 140 faces the curvature-free steel plate 111, and the water spraying area can cover the curvature-free steel plate 111. Therefore, the water source system 140 can spray cooling water to the curvature-free steel plate in the tank wall simulation system, so that the cooling water can descend along the curvature-free steel plate to form a liquid film 150.

[0047] On this basis, the water source system 140 is configured to spray cooling water toward the curvature-free steel plate 111 in the tank wall simulation system. The spray state includes the cooling water spray angle, spray flow rate, spray distance, etc. The state of the liquid film 150 formed on the curvature-free steel plate 111 is dynamically adjusted based on the cooling water spray state adjusted by the water source system 140. The state of the liquid film includes the thickness of the liquid film, the width of the liquid film, etc., so as to accurately simulate the flow of the cooling water film on the surface of the tank under a real fire environment.

[0048] The fire source system in this experimental device specifically corresponds to the non-curvature steel plate 111 setting in the tank wall simulation system, which can burn to generate heat radiation, and can act on the liquid film 150 on the non-curvature steel plate 111 to simulate the heating state of the tank surface under a real fire environment.

[0049] The measurement system 120 in this experimental device specifically corresponds to the curvature-free steel plate 111 in the tank wall simulation system, and is configured to collect in real time the flow rate of cooling water on the curvature-free steel plate 111, the surface temperature of the curvature-free steel plate, and the radiant heat intensity generated by the fire source system relative to the curvature-free steel plate, thereby obtaining the required experimental basic data in real time.

[0050] The liquid film identification system 130 in this experimental device is also set up corresponding to the curvature-free steel plate 111 in the tank wall simulation system, and is configured to work synchronously with the measurement system 120 to identify the thickness and width of the liquid film 150 formed on the curvature-free steel plate 111, as well as the liquid film flow field distribution data in real time.

[0051] The thickness and width of the liquid film 150 identified here, as well as the liquid film flow field distribution data, form a corresponding relationship with the data such as the flow rate of cooling water, the surface temperature of the non-curvature steel plate and the radiant heat intensity generated by the fire source system relative to the non-curvature steel plate measured synchronously by the measurement system 120, thereby forming experimental data that can be used to evaluate the cooling effect of fire water cannons, fire water guns, and fixed water sprinkler systems, and can be used to study the water cooling protection mechanism of oil and gas storage tanks under fire environments.

[0052] With respect to the experimental device scheme for studying the water cooling effect of a storage tank provided in the present invention, the implementation scheme and corresponding technical features of the experimental device are specifically described below.

[0053] See also Figure 2 and Figure 3In some embodiments, the tank wall simulation system 110 in the experimental device specifically uses a 2m×3m non-curvature steel plate 111 to simulate the actual tank surface, and a placement bracket 112 is further configured for the non-curvature steel plate 111. The placement bracket 112 can support the non-curvature steel plate 111, so that the non-curvature steel plate 111 is stably distributed vertically, can withstand the impact of a certain flow rate of cooling water in the water source system 140, and maintain a stable state.

[0054] As a further arrangement, a plurality of placement holes are provided on the curvature-free steel plate 111 in the experimental device for placing corresponding measuring elements in the measuring system 120, so that the corresponding measuring elements in the measuring system 120 can be placed in the curvature-free steel plate 111 in an embedded structural form. This not only makes the measurement data of the corresponding measuring elements more accurate, but also can further avoid the corresponding measuring elements being arranged on the surface of the curvature-free steel plate 111, thereby avoiding affecting the flow morphology of the liquid film 150 on the curvature-free steel plate 111.

[0055] Specifically, the present invention provides a plurality of placement holes of different sizes on the non-curvature steel plate 111 , and a plurality of placement holes of each size are provided, thereby adapting to different measuring elements to meet different experimental requirements.

[0056] like Figure 3 As shown, it shows an example of setting the placement holes on the curvature-free steel plate 111 given by the present invention. In this example, a plurality of placement holes of two sizes are set on the curvature-free steel plate 111: a plurality of first placement holes 113 with large apertures, and a plurality of first placement holes 114 with small apertures.

[0057] Among them, the first placement hole 113 with a large aperture can be configured to install a large-sized measuring element, such as a radiation heat flux meter for measuring the radiation heat flux intensity, etc.; the first placement hole 114 with a small aperture can be configured to install a small-sized measuring element, such as a flow sensor (Pitot tube) for measuring the liquid film flow velocity, etc.

[0058] On this basis, in response to the morphological changes of different measurement objects, the specific distribution settings of two specifications of installation holes on the non-curvature steel plate 111 are optimized in this example scheme to adapt to measurement objects of different shapes and ensure the accuracy of the measurement results.

[0059] As an example, the scheme of the present invention needs to effectively measure the flow velocity and radiation heat flux intensity of the liquid film on the curvature-free steel plate 111. In view of the characteristics of the formation and flow of the liquid film on the curvature-free steel plate 111, in this example scheme, a plurality of first placement holes 114 for placing flow velocity sensors (Pitot tubes) for measuring the flow velocity of the liquid film are arranged on the surface of the curvature-free steel plate 111 in an array, thereby comprehensively and accurately obtaining the flow velocity of the liquid film in each area on the curvature-free steel plate 111.

[0060] As a further example, in the present exemplary embodiment, 7 rows of first placement holes 114 are evenly spaced from top to bottom on the surface of the non-curvature steel plate 111, and 20 first placement holes 114 are arranged in each row, and the 20 first placement holes 114 in each row are evenly distributed from one side of the non-curvature steel plate 111 to the other side of the non-curvature steel plate 111 in sequence; thereby, the distribution area of ​​the liquid film on the non-curvature steel plate 111 can be fully covered.

[0061] In view of the characteristics of radiation heat flux as used on the curvature-free steel plate 111, in this example scheme, a plurality of first installation holes 113 for installing radiation heat flux meters for measuring the intensity of radiation heat flux are distributed from top to bottom along the central axis of the surface of the curvature-free steel plate 111, so as to accurately obtain the intensity of radiation heat flux on the surface of the curvature-free steel plate 111.

[0062] As a further example, in this example scheme, three first placement holes 113 are set on the surface of the non-curvature steel plate 111, one of the first placement holes 113 is distributed in the middle position of the central axis of the surface of the non-curvature steel plate 111, and the other two first placement holes 113 are equidistantly distributed along the central axis of the surface of the non-curvature steel plate 111 on the upper and lower sides of the first placement hole 113 in the middle position. Such distribution can comprehensively and accurately obtain the radiation heat flux intensity of the central and peripheral parts of the surface of the non-curvature steel plate 111.

[0063] As an alternative, a plurality of first placement holes 113 may be further provided on the surface of the non-curvature steel plate 111, wherein one of the first placement holes 113 is located in the middle position of the central axis of the surface of the non-curvature steel plate 111, and the remaining first placement holes 113 are distributed on the surface of the non-curvature steel plate 111 in the form of a plurality of concentric circles with the first placement hole 113 in the middle position as the center.

[0064] As a further explanation, the solution of the present invention is directed to the placement holes provided on the non-curvature steel plate 111, and preferably a corresponding plugging cover is configured, which is adapted to the corresponding placement hole and can seal the hole of the placement hole when the corresponding measuring element is not placed in the placement hole, and ensure the flatness of the non-curvature steel plate 111, thereby avoiding affecting the flow morphology of the liquid film on the non-curvature steel plate 111.

[0065] As a further example, the solution of the present invention is for the installation holes set on the non-curvature steel plate 111, preferably threaded holes, so that it is convenient to connect and set with the corresponding measuring elements; at the same time, for each threaded hole serving as a installation hole, a bolt made of the same type of material as the steel plate is configured as a plugging cover. In this way, when the corresponding measuring element in the measuring system is not installed in the corresponding threaded hole, the hole can be sealed with the corresponding bolt, thereby ensuring the overall flatness of the surface of the non-curvature steel plate 111 and avoiding affecting the flow morphology of the liquid film.

[0066] As a further explanation, the solution of the present invention further configures a corresponding ruler 115 for the non-curvature steel plate 111, which is used to cooperate with the liquid film recognition system 130 to measure the size of the pixel points of the captured image.

[0067] Specifically, the ruler 115 is distributed from top to bottom along the curvature-free steel plate 111 as a whole, and the two ends of the ruler 115 are respectively connected to the two ends of the curvature-free steel plate 111 by sliding cooperation. Such a configuration enables the ruler 115 to slide from one side of the curvature-free steel plate 111 to the other side along the width direction of the curvature-free steel plate 111, thereby effectively cooperating with the measurement of the liquid film recognition system 130.

[0068] As a further explanation, the solution of the present invention preferably adopts an adjustable frame structure for the placement bracket 112, which is convenient for adapting to different experimental requirements and ensuring the stability of the support for the non-curvature steel plate 111. Figure 2 shown.

[0069] As a preferred setting, the solution of the present invention is directed to a mounting bracket 112, on which at least one beam 116 that can be moved up and down is arranged, and the form in which the beam 116 is moved up and down on the mounting bracket 112 corresponds to the distribution form of corresponding mounting holes on the non-curvature steel plate 111, so as to cooperate with the non-curvature steel plate 111 to mount corresponding measuring elements in the measuring system 120, such as a flow sensor (Pitot tube) 121 for measuring the liquid film flow velocity in the mounting measuring system 120.

[0070] See also Figure 4 In some embodiments, the measurement system 120 in the experimental device is composed of a flow rate sensor (Pitot tube) 121, a thermocouple 122, a radiation heat flow meter 123 and a data acquisition instrument 124.

[0071] Among them, the flow rate sensor (Pitot tube) 121 and the thermocouple 122 are respectively placed on the surface of the non-curvature steel plate 111 facing the cooling water, and are used to measure the flow rate of the liquid film on the surface of the non-curvature steel plate 111 and the temperature of the surface of the non-curvature steel plate 111 respectively.

[0072] In order to ensure the reliability of the placement of the flow velocity sensor (Pitot tube) 121 and the thermocouple 122 , the flow velocity sensor (Pitot tube) 121 and the thermocouple 122 are preferably placed in corresponding placement holes on the non-curvature steel plate 111 by screw connection.

[0073] Specifically, the thermocouple 122 is installed in a corresponding installation hole on the non-curvature steel plate 111 by screwing, and the corresponding data line extends from the back side of the non-curvature steel plate 111 through the installation hole to connect to the data acquisition instrument 124.

[0074] like Figure 5As shown, the flow velocity sensor (Pitot tube) 121 is integrally placed in a corresponding placement hole (such as the first placement hole 113) on the curvature-free steel plate 111. The measuring front end of the flow velocity sensor (Pitot tube) 121 extends out of the placement hole and is bent upward to be close to the surface of the curvature-free steel plate 111, so that the liquid film 150 formed on the surface of the curvature-free steel plate 111 can cover the entire measuring front end of the flow velocity sensor (Pitot tube) 121, thereby ensuring the accuracy of the measurement; the rear end of the flow velocity sensor (Pitot tube) 121 extends from the rear end of the placement hole and is placed on the corresponding adjustable beam 116 on the placement bracket 112, ensuring the stability and reliability of the installation.

[0075] The radiation heat flux meter 123 in the measurement system 120 is specifically set up corresponding to the curvature-free steel plate 111 and the fire source system, thereby measuring the radiation heat intensity of the fire source system acting on the curvature-free steel plate 111.

[0076] The data acquisition instrument 124 in the measurement system 120 is the data aggregation and preprocessing center of the entire measurement system. It is connected to the flow velocity sensor 121, the thermocouple 122 and the radiation heat flux meter 123 through corresponding data lines, thereby synchronously collecting the data generated by the flow velocity sensor 121, the thermocouple 122 and the radiation heat flux meter 123, and performing preliminary preprocessing to facilitate subsequent analysis.

[0077] The specific structure of the data acquisition device 124 is not limited here and can be determined according to actual needs.

[0078] In some embodiments, the water source system 140 in the experimental device is specifically composed of a water tank 141, a water pump 142 and a cooling water release device 143.

[0079] Among them, the water outlet end of the cooling water release device 143 is arranged to face the curvature-free steel plate 111 in the tank wall simulation system, and the water inlet end of the cooling water release device 143 is connected with the water tank 141 through the water pump 142. In this way, the water pump 142 provides power to transport the cooling water in the water tank 141 to the cooling water release device 143 at a certain pressure, and then the cooling water release device 143 sprays the cooling water to the surface of the curvature-free steel plate 111 in the tank wall simulation system through the water outlet end, so that the cooling water descends along the surface of the curvature-free steel plate 111 to form a liquid film 150.

[0080] The water tank 141 here is configured to hold cooling water for experiments. The specific structure of the water tank 141 is not limited and can be determined according to actual needs.

[0081] The water pump 142 cooperates with it, as the power device in the whole water source system 140, is connected to the water tank 141 through the water inlet pipe, and is connected to the water inlet end of the cooling water release device 143 through the water outlet pipe. The specific structure of the water pump 142 is not limited and can be determined according to actual needs. As an example, a variable frequency water pump is preferably used in the solution of the present invention, so that when precise control can be achieved, energy consumption can be further reduced.

[0082] Furthermore, a corresponding flow meter is further configured for the water pump 142 to achieve accurate control of the water spray flow of the cooling water release device 143.

[0083] In order to adapt to different experimental environments or experimental requirements, the cooling water release device 143 in the water source system 140 is further configured to spray cooling water toward the non-curvature steel plate at different spray angles, spray distances and / or flow rates, thereby adjusting the shape of the liquid film 150 formed by the cooling water on the non-curvature steel plate 111, such as the thickness and width of the liquid film 150, that is, forming liquid films of different thicknesses and widths to meet different experimental requirements.

[0084] As a further explanation, the cooling water release device 143 in the solution of the present invention specifically includes three parts: a support frame 143a, a nozzle device 143b, and an adjustment seat 143c.

[0085] The support frame 143a is used to carry the corresponding nozzle device 143b. The support frame 143a is distributed relative to the non-curvature steel plate 111 in the tank wall simulation system 110, and can move back and forth relative to the surface of the non-curvature steel plate 111, thereby adjusting the distance between the nozzle device 143b and the surface of the non-curvature steel plate 111, that is, adjusting the distance of the cooling water spray.

[0086] As an example, a mounting seat is provided at the bottom of the support frame 143a, and the mounting seat is movably mounted on the mounting bracket 112 in the tank wall simulation system 110, and is specifically configured to be able to move back and forth relative to the non-curvature steel plate 111 on the mounting bracket 112. In this way, the support frame 143a can move back and forth relative to the surface of the non-curvature steel plate 111 to adjust the spacing distance between the two.

[0087] The adjustment seat 143c in the cooling water release device 143 is placed on the support frame 143a, and is configured to be able to adjust the distribution height up and down along the support frame 143a, and to be able to maintain a relative state at a desired height. The specific composition of the adjustment seat 143c and the adjustable matching structure between the adjustment seat 143c and the support frame 143a are not limited here, which depends on actual needs and is a well-known technology for those skilled in the art.

[0088] The nozzle device 143b in the cooling water release device 143 is placed on the adjustment seat 143c, and the nozzle device 143b is further configured so that the water outlet end faces the non-curvature steel plate 111, and the water inlet end is connected to the water pump 142. The nozzle device 143b thus arranged can spray cooling water to the non-curvature steel plate 111 under the action of the water pump 142.

[0089] On this basis, the nozzle device 143b is placed on the adjustment seat 143c in a multi-directionally adjustable placement structure, so that the nozzle device 143b can be adjusted in a multi-directional distributed angle on the adjustment seat 143c, thereby adjusting the spray angle of the nozzle device 143b relative to the non-curved steel plate 111. The specific structure of the nozzle device 143b and the multi-directionally adjustable placement structure between the nozzle device 143b and the adjustment seat 143c are not limited here, which depends on actual needs.

[0090] In the cooling water release device 143 thus formed, the nozzle device 143b is placed on the adjustment seat 143c through a multi-directional adjustable placement structure, and the adjustment seat 143c is adjustably placed on the support frame 143a, and the support frame 143a is movably placed on the placement bracket 112. Among them, the nozzle device 143b can spray cooling water to the non-curvature steel plate 111 under the action of the water pump 142 to form a liquid film 150 on the surface of the non-curvature steel plate 111; during this spraying process, the distance of the nozzle device 143b relative to the non-curvature steel plate 111 can be adjusted by moving the support frame 143a on the placement bracket 112, thereby adjusting the spray distance of the cooling water sprayed by the nozzle device 143b; the distribution height of the nozzle device 143b can be adjusted by moving the adjustment seat 143c on the support frame 143a, and then adjusting the adjustment height. The nozzle device 143b sprays the cooling water at a spray height; the distribution angle or orientation of the nozzle device 143b on the adjustment seat 143c can be adjusted to thereby adjust the spray angle of the nozzle device 143b relative to the non-curvature steel plate 111, and then adjust the spray angle of the cooling water sprayed by the nozzle device 143b; through the coordination of the above-mentioned multiple adjustment modes, it is possible to adjust the shape of the liquid film 150 formed by the cooling water on the non-curvature steel plate 111, such as the thickness and width of the liquid film 150, that is, to form liquid films of different thicknesses and widths to meet different experimental requirements.

[0091] As a further improvement scheme, the scheme of the present invention also sets a cooling water recovery device in the water source system 140, which is used to collect the cooling water sprayed onto the non-curvature steel plate 111 and recycle it for reuse, so as to avoid the cooling water flowing everywhere, polluting the experimental environment and causing safety hazards. At the same time, it can recycle water resources for reuse and avoid waste of resources.

[0092] As an example, the cooling water recovery device here is specifically composed of a cooling water recovery tank, a recovery water pump, a filter, and a cooling recovery tank.

[0093] The cooling water recovery tank is arranged on the mounting bracket 112 and is located at the bottom of the non-curvature steel plate 111, and is used to collect the cooling water flowing down from the non-curvature steel plate 111. The cooling water recovery tank is provided with a water outlet at the bottom thereof, which is connected to a recovery water pump through a pipeline, and the water outlet of the recovery water pump is connected to the filter, and the water outlet of the filter is connected to the cooling recovery box through a pipeline, and the cooling recovery box can be connected to the water tank 141 through a transmission pipeline.

[0094] In this way, the cooling water flowing down from the non-curvature steel plate 111 is collected by the cooling water recovery tank, thereby avoiding the problems of safety, environmental protection and waste of resources caused by the cooling water flowing everywhere.

[0095] On this basis, the cooling water collected in the cooling water recovery tank is extracted by a recovery water pump, so that the cooling water passes through a filter to filter out the residue and then enters the cooling recovery tank.

[0096] During the experiment, the cooling water sprayed on the curvature-free steel plate 111 forms a liquid film to cool the surface of the curvature-free steel plate 111, and then flows into the cooling water recovery tank, the temperature of the cooling water will become high. Such cooling water cannot be directly added to the water tank 141 for recycling after filtering, which affects the accuracy of the experimental data. For this reason, the filtered cooling water is transported to the cooling recovery tank for cooling treatment. After the water temperature in the cooling recovery tank is cooled to meet the requirements, the recovered cooling water in the cooling recovery tank is added to the water tank 141 for recycling, thereby realizing the recycling of cooling water and avoiding the waste of water resources.

[0097] See also Figure 6 In some embodiments, the fire source system 160 in the experimental device is specifically composed of a combustible material 161, an oil pan 162, and a weighing component 163.

[0098] The combustible material 161 constitutes a heat source when burned, and preferably, the combustible material 161 may be a combustible material such as n-heptane or gasoline.

[0099] The oil pan 162 is used to carry the combustible material 161 for combustion. The specific structure of the oil pan 162 is not limited here and can be determined according to actual needs. It is preferably made of high-temperature resistant material.

[0100] The weighing component 163 is used to measure the mass loss of the combustible 161 during the combustion process. Specifically, the weighing component 163 is arranged in cooperation with the oil pan 162 to achieve real-time measurement of the mass loss of the combustible 161 during the combustion process.

[0101] As a further explanation, the weighing component 163 in the scheme of the present invention is preferably composed of a balance, so as to ensure the accuracy of measurement. On this basis, in view of the high-temperature working environment formed by the combustion of the combustible material 161, the scheme of the present invention provides an insulating tray 164 on the balance to support the oil pan 162, so as to prevent the high heat generated by the combustion of the combustible material 161 in the oil pan 162 from being transferred to the balance and affecting the balance.

[0102] In the fire source system 160 thus formed, a combustible material 161 such as n-heptane or gasoline is placed in an oil pan 162, and the oil pan 162 carrying the combustible material is then placed on an insulating tray 164 on a weighing assembly 163. On this basis, the combustible material 161 is ignited, and the radiant heat generated by the combustion of the combustible material 161 in the oil pan 162 can act on the liquid film 150 formed on the surface of the non-curved steel plate 111, thereby simulating a "dry spot" effect. In this process, the weighing assembly 163 can measure the mass loss of the combustible material during combustion in real time, and then calculate the heat release rate (HRR) of the fire source.

[0103] Combination Figure 1 As shown, the liquid film recognition system 130 specifically includes a laser 131 , a high-speed camera 132 and an image processing module 133 .

[0104] The laser 131 is configured to generate a laser beam capable of irradiating the flowing liquid film 150 on the non-curvature steel plate and causing the flowing liquid film 150 on the non-curvature steel plate to generate fluorescence.

[0105] Specifically, the laser 131 is preferably set on the side of the non-curved steel plate 111, and is further configured so that the laser beam generated by the laser 131 can be emitted into the flowing liquid film 150 from the side of the flowing liquid film 150 on the non-curved steel plate, thereby causing the flowing liquid film 150 to generate fluorescence.

[0106] On this basis, in order to cooperate with the laser 131 to enable the flowing liquid film 150 on the non-curved steel plate to produce obvious fluorescence, the innovative solution of the present invention adds a dye solution of corresponding concentration and capable of producing fluorescence when irradiated by a laser beam into the water tank 141 in the water source system 140.

[0107] In this way, when cooling water with corresponding dye added forms a flowing liquid film 150 on the non-curved steel plate, when the laser beam generated by the laser 131 is shot into the flowing liquid film 150 from the side, the entire flowing liquid film 150 will produce fluorescence, so that the morphological image of the flowing liquid film 150 can be obtained in conjunction with the high-speed camera 132.

[0108] The high-speed camera 132 in the present liquid film recognition system 130 is configured to be able to obtain a morphological image of the flowing liquid film 150 on the non-curvature steel plate.

[0109] Specifically, the high-speed camera 132 is preferentially arranged on the side of the curvature-free steel plate 111 and in front of the curvature-free steel plate facing the cooling water surface, thereby synchronously acquiring from the side and front the fluorescent signal generated by the liquid film formed on the curvature-free steel plate being irradiated by the laser 131, thereby synchronously forming the morphological images of the side and front of the liquid film.

[0110] The image processing module 133 in the liquid film recognition system 130 is configured to data-connect the laser 131 and the high-speed camera 132, and can calculate the actual thickness, width and flow field distribution of the irradiated liquid film based on the fluorescent signal of the irradiated liquid film and the formed liquid film morphology image.

[0111] As a further explanation, when constructing the liquid film recognition system 130, the present invention preferably uses a laser 131 with a power of 2W and a wavelength of 532nm. The laser 131 is arranged in parallel on one side of the non-curvature steel plate 111 in the tank wall simulation system 110, and can effectively irradiate the liquid film 150 formed by the descending of the non-curvature steel plate 111 in the tank wall simulation system, thereby making the entire liquid film 150 appear in a fluorescent state.

[0112] On this basis, the solution of the present invention adopts two groups of high-speed cameras: a first high-speed camera 132a and a second high-speed camera 132b.

[0113] The first high-speed camera 132a is arranged on the other side of the non-curvature steel plate 111 relative to the laser 131, so that the first high-speed camera 132a is arranged on the side of the irradiated liquid film, and can sense the fluorescent signal generated by the liquid film from the side of the irradiated liquid film to obtain the side morphological image of the irradiated liquid film, that is, the thickness morphological image of the irradiated liquid film;

[0114] The second high-speed camera 132b is specifically distributed in front of the non-curvature steel plate 111 facing the cooling water surface. It can sense the fluorescent signal generated by the irradiated liquid film from the front side of the irradiated liquid film and obtain the front morphological image of the irradiated liquid film, that is, the width and flow field distribution morphological image of the irradiated liquid film.

[0115] In order to facilitate the subsequent image processing module 133 to calculate and identify the thickness, width and flow field distribution of the liquid film based on the morphological image formed by the first high-speed camera 132a and the second high-speed camera 132b, the first high-speed camera 132a and the second high-speed camera 132b cooperate with the ruler 115 set on the non-curvature steel plate 111 to form a corresponding morphological image of the liquid film, that is, the corresponding scale of the ruler 115 is synchronously presented in the formed morphological image, so that the formed morphological image directly has the corresponding actual scale value. On this basis, by directly identifying the scale of the ruler, the actual size of the pixel points in the image can be inversely calculated, and then the total number of pixels occupied by the corresponding morphological image of the liquid film is obtained by measurement, and finally the actual size of the liquid film is obtained, which facilitates the image processing module 133 to accurately identify and calculate the thickness, width and flow field distribution of the liquid film.

[0116] In some embodiments, the liquid film recognition system 130 in the experimental device is composed of an image processing module 133 cooperating with a first high-speed camera 132a to photograph the liquid film flowing downward on the non-curvature steel plate 111 from the side, thereby obtaining a side morphological image of the irradiated liquid film, that is, a thickness morphological image of the irradiated liquid film, and determining the actual thickness of the liquid film at different positions through pixel points; on this basis, the image processing module 133 cooperates with the second high-speed camera 132b to sense the fluorescent signal generated by the liquid film from the front of the irradiated liquid film, obtain the front morphological image of the irradiated liquid film, that is, the width and flow field distribution morphological image of the irradiated liquid film, and further fuse to determine the actual thickness of the liquid film at different positions, and identify and determine the width and flow field distribution of the liquid film at different positions.

[0117] Furthermore, the image processing module 133 in the solution of the present invention is specifically composed of a computer and an image recognition processing system running in the computer. The computer here is connected to the laser 131, two sets of high-speed cameras 132 and the data acquisition device 124 in the measurement system 120 through corresponding data lines, and is configured to control the laser 131 and the high-speed camera 132 to work synchronously, and to synchronously obtain corresponding image data from the two sets of high-speed cameras 132, and to obtain the collected cooling water flow rate, the surface temperature of the non-curvature steel plate and the radiant heat intensity generated by the fire source system relative to the non-curvature steel plate from the data acquisition device 124.

[0118] The image recognition processing system running in the computer is configured to acquire the image data obtained by the computer and perform recognition processing to form the thickness, width and flow field distribution of the liquid film.

[0119] On this basis, the computer in the image processing module 133 can establish a corresponding relationship between the thickness, width and flow field distribution data of the liquid film identified and calculated, and the flow rate of the cooling water, the surface temperature of the non-curvature steel plate and the radiant heat intensity generated by the fire source system relative to the non-curvature steel plate collected synchronously from the data acquisition instrument 124, so as to facilitate subsequent related analysis.

[0120] With respect to the experimental device 100 for studying the cooling effect of water in a storage tank formed by the solution of the present invention, the following example illustrates the implementation process of conducting a cooling effect experiment of water in a storage tank based on the experimental device.

[0121] Combination Figure 1 As shown, when the experimental device formed based on the scheme of the present invention conducts a tank water cooling effect experiment, it is necessary to construct the experimental device according to the aforementioned experimental device composition scheme.

[0122] After completing the construction of the experimental device, first prepare a solution containing a fixed concentration of dye, and add the dye solution to the cooling water in the water tank 141, then start the water pump 142 in the water source system 140, so that the water column sprayed by the cooling water release device 143 hits the surface of the non-curvature steel plate 111 and then falls to form a layer of liquid film 150.

[0123] On this basis, according to the position of the liquid film during the test, the position of the ruler 115 on the non-curved steel plate 111 is adjusted to ensure that the ruler is close to the boundary of the liquid film 150, and the relative positions of other equipment are adjusted to calibrate the horizontal and vertical, to ensure that the center of the liquid film 150, the laser 131 and the first high-speed camera 132a remain parallel to the light propagation direction, and to ensure that the center of the second high-speed camera 132b remains perpendicular to the light propagation direction. Then adjust the relative distance between the liquid film 150, the laser 131, the first high-speed camera 132a, and the second high-speed camera 132b along the light propagation direction to ensure that the irradiation light received by the liquid film is uniform and stable, and the first high-speed camera 132a can clearly obtain and store the two-dimensional color image of the liquid film, and the second high-speed camera 132b can clearly obtain and store the two-dimensional fluorescent image of the liquid film.

[0124] Thus, the preparation work before the experiment is completed, and the water pump 142 in the water source system 140 is turned off.

[0125] Next, according to the relative distribution state between the non-curvature steel plate 111 and the cooling water release device 143, a fire source system 160 is set up, and n-heptane (99% purity) is placed in the oil pan 162 and ignited to form an oil pool fire to simulate the heat radiation received by the storage tank in a real fire situation.

[0126] Next, the laser 131, the first high-speed camera 132a and the second high-speed camera 132b are started, and then the water pump 142 in the water source system 140 is started, so that the water in the water tank 141 is pumped out, and then sprayed toward the non-curvature steel plate 111 by the cooling water release device 143. The sprayed water column hits the plate surface and falls to form a layer of liquid film 150. The first high-speed camera 132a and the second high-speed camera 132b synchronously record the images of the formation and change process of the liquid film 150 from the side and the front.

[0127] At the same time, the image processing module 133 synchronously obtains the morphological images of the side and front of the liquid film formed by the first high-speed camera 132a and the second high-speed camera 132b, and calculates the size of the image pixels by recognizing the corresponding morphological images and then comparing them with the scale of the ruler in the image. Then, the liquid film thickness δ and the liquid film width w are obtained according to the shooting ratio.

[0128] On this basis, the average value of the liquid film thickness can be obtained by shooting the instantaneous liquid film thickness at 100 different times. , the main purpose is to reduce the measurement error.

[0129] During the above-mentioned experimental process, the measurement system 120 synchronously and in real time collects the flow rate of cooling water on the curvature-free steel plate 111, the surface temperature of the curvature-free steel plate and the radiant heat intensity generated by the fire source system relative to the curvature-free steel plate, and the measured data are synchronously transmitted to the image processing module 133, so that the calculated current liquid film thickness, width and flow field distribution data can form an accurate correspondence with the current cooling water flow rate, the surface temperature of the curvature-free steel plate and the radiant heat intensity generated by the fire source system relative to the curvature-free steel plate, thereby obtaining the required basic experimental data in real time.

[0130] At the same time, the mass loss of combustibles during combustion is measured synchronously and in real time, and the heat release rate (HRR) of the fire source can be calculated.

[0131] Subsequently, according to the experimental requirements, the cooling water can be sprayed toward the curvature-free steel plate by adjusting the spray angle, spray distance and / or flow rate of the cooling water release device 143, thereby adjusting the shape of the liquid film 150 formed by the cooling water on the curvature-free steel plate 111, such as the thickness and width of the liquid film 150, that is, forming liquid films of different thicknesses and widths. In this process, the measurement system 120 synchronously and real-time collects the flow rate of the cooling water on the curvature-free steel plate 111, the surface temperature of the curvature-free steel plate and the radiant heat intensity generated by the fire source system relative to the curvature-free steel plate, thereby forming multiple groups of experimental basic data to meet different experimental requirements.

[0132] It can be seen from the above scheme that the experimental device scheme for studying the cooling effect of storage tank water provided by the scheme of the present invention has the following excellent effects compared with the prior art:

[0133] 1. Use a 2m×3m non-curved steel plate to simulate the wall of the oil and gas storage tank; spray cooling water onto the wall through a cooling water release device to form liquid films of different thicknesses and widths; use a high-speed camera to shoot the dyed liquid film, and calculate the thickness and width of the liquid film in combination with the scale of the near-liquid film ruler; use a laser to irradiate the liquid film with added fluorescent agent to calculate the liquid film flow field distribution; use a temperature sensor and a radiation heat flux meter to obtain the wall temperature and radiation heat intensity. Based on synchronous technology, the present invention can obtain the wall temperature, liquid film thickness, liquid film width, radiation heat flux intensity, liquid film flow rate, and water cooling protection mechanism, which are used to evaluate the cooling effect of fire water cannons, fire water guns, and fixed water sprinkler systems under fire conditions, and provide scientific guidance for fire rescue teams to fight oil and gas storage tank fires.

[0134] 2. The overall structure of the present invention is simple and easy to operate. Through subsequent processing, the thickness of the liquid film with a small error can be obtained. The accuracy of the thickness measurement is expressed by the relative standard deviation. Repeat the measurement of the thickness at a fixed position 10 times and pass Calculate the relative standard deviation. is the average film thickness of each measurement, is the average of the average film thickness, n = 10. Average film thickness It is determined by calculating the average value of instantaneous film thickness data collected at 100 different time moments. The calculated relative standard deviation RSD is less than 1.4%.

[0135] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An experimental device for studying the cooling effect of tank water, characterized in that: The experimental device includes a tank wall simulation system, a measurement system, a liquid film identification system, a water source system and a fire source system; The tank wall simulation system is mainly composed of a non-curvature steel plate to simulate the tank wall structure; The water source system is arranged corresponding to the non-curvature steel plate in the tank wall simulation system, and can spray cooling water to the non-curvature steel plate in the tank wall simulation system, so that the cooling water can descend along the non-curvature steel plate to form a liquid film, and the liquid film state can be adjusted by adjusting the cooling water spraying state; The fire source system is set corresponding to the non-curvature steel plate in the tank wall simulation system, so that the generated heat radiation acts on the liquid film on the non-curvature steel plate; The measurement system corresponds to the non-curvature steel plate in the tank wall simulation system and is configured to collect the flow rate of cooling water on the non-curvature steel plate, the surface temperature of the non-curvature steel plate, and the radiant heat intensity generated by the fire source system relative to the non-curvature steel plate; The liquid film recognition system corresponds to the curvature-free steel plate setting in the tank wall simulation system, and is configured to act synchronously with the measurement system. The liquid film recognition system is configured to make the liquid film formed along the descending curvature-free steel plate fluorescent, and obtain the morphological image of the liquid film formed on the curvature-free steel plate based on the fluorescent signal generated by the liquid film, and then identify the thickness and width of the liquid film formed on the curvature-free steel plate, as well as the flow field distribution of the liquid film based on the morphological image of the liquid film.

2. The experimental device for studying the cooling effect of storage tank water according to claim 1 is characterized in that: The tank wall simulation system also includes a bracket, which is arranged in cooperation with the non-curvature steel plate to form a vertical support for the non-curvature steel plate.

3. The experimental device for studying the cooling effect of storage tank water according to claim 1, characterized in that: The measurement system includes a flow rate sensor, a thermocouple, a radiation heat flux meter and a data acquisition instrument. The flow rate sensor and the thermocouple are respectively arranged on the surface of the non-curvature steel plate facing the cooling water; the radiation heat flux meter is set corresponding to the fire source system; and the data acquisition instrument is respectively connected to the flow rate sensor, the thermocouple and the radiation heat flux meter.

4. The experimental device for studying the cooling effect of storage tank water according to claim 1 is characterized in that: The liquid film recognition system includes a laser, a high-speed camera and an image processing module. The laser is arranged on the side of the non-curved steel plate and is configured to effectively irradiate the liquid film formed along the descending of the non-curved steel plate, so that the entire liquid film appears in a fluorescent state; the high-speed camera is cooperatively arranged on the side of the non-curved steel plate and in front of the non-curved steel plate facing the cooling water surface, and obtains the morphological image of the liquid film formed on the non-curved steel plate based on the fluorescent signal generated by the liquid film; the image processing module connects the laser and the high-speed camera, and is configured to be able to calculate and identify the actual thickness, width and flow field distribution of the liquid film based on the generated liquid film morphological image.

5. The experimental device for studying the cooling effect of storage tank water according to claim 1, characterized in that: The water source system includes a water tank, a water pump and a cooling water release device. The water outlet end of the cooling water release device is arranged facing the non-curvature steel plate in the tank wall simulation system, and the water inlet end is connected to the water tank through a water pump. The cooling water release device is configured to spray cooling water toward the non-curvature steel plate at different angles, distances and / or flow rates.

6. The experimental device for studying the cooling effect of tank water according to claim 1, characterized in that: The fire source system is composed of combustibles, an oil pan and a balance.

7. An experimental method for studying the cooling effect of water in a storage tank, characterized in that: The experimental method is based on an experimental device for studying the cooling effect of water in a storage tank according to any one of claims 1 to 6, comprising: Use non-curvature steel plates to simulate the wall of oil and gas storage tanks; Cooling water is sprayed toward the non-curved steel plate to form liquid films of different thicknesses and widths; at the same time, heat radiation is generated and acts on the liquid film on the non-curved steel plate; The surface temperature and radiation heat intensity of the curvature-free steel plate are obtained in real time; and the liquid film formed along the curvature-free steel plate is simultaneously made to be in a fluorescent state, and then the morphological image of the liquid film formed on the curvature-free steel plate is obtained based on the fluorescent signal generated by the liquid film; The actual thickness, width and flow field distribution of the liquid film are calculated and identified based on the generated liquid film morphology image.

8. The experimental method for studying the cooling effect of water in a storage tank according to claim 7, characterized in that: In the experimental method, when spraying cooling water onto the non-curvature steel plate, the cooling water is sprayed onto the non-curvature steel plate at different angles, distances and / or flow rates to form liquid films of different thicknesses and widths.

9. The experimental method for studying the cooling effect of water in a storage tank according to claim 7, characterized in that: The experimental method uses a laser to irradiate the liquid film formed along the curvature-free steel plate, so that the entire liquid film appears in a fluorescent state, and then uses a high-speed camera to sense the fluorescent signal generated by the liquid film to obtain a morphological image of the liquid film formed on the curvature-free steel plate, and then calculates and identifies the actual thickness, width and flow field distribution of the liquid film based on the generated liquid film morphological image.

10. The experimental method for studying the cooling effect of tank water according to claim 7, characterized in that: The experimental method generates heat radiation by burning combustibles, and synchronously measures the mass loss of the combustibles during the combustion process, and determines the heat release rate of the fire source based on the mass loss.

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