Pool fire target point view factor calculation method, device and equipment

Abstract

The invention provides a pool fire target point view factor calculation method, device and equipment. The method is applied to the technical field of fire safety, key parameters of pool fire are determined according to environment parameters corresponding to a pool fire range, and the key parameters include the pool fire center, the pool fire dip angle, the pool fire height and the pool fire radius; determining a target point pool fire image according to the key parameters; the view angle factors of the multiple key reference points are determined, the target view angle factor of the target point is calculated according to the multiple view angle factors and the pool fire image of the target point, the view angle factors are used for indicating the incidence relation between the corresponding position points and the heat radiation intensity, and the calculation efficiency of the view angle factor of any target point around the pool fire disaster under the wind condition is improved.

Description

Technical Field

[0001] The present application belongs to the field of fire safety technology, and in particular, relates to a method, device and equipment for calculating the viewing angle factor of a pool fire target point. Background Art

[0002] Fire safety technology refers to the application of scientific, engineering and management principles to prevent, control and reduce the harm caused by fire to people, property and the environment. It aims to ensure the fire safety of buildings, facilities and workplaces, and effectively respond to emergencies when fire occurs.

[0003] In the existing technology, the calculation methods of the view factor of the target point around the pool fire include the point source method, the solid flame model and the numerical simulation calculation based on computational fluid dynamics. The point source method is a simplified calculation model, which is usually used in manual calculations or calculation tools made by individual developers; the solid flame model abstracts the pool fire into a regular geometric body, such as a cylinder in the absence of wind and an oblique cylinder in the presence of wind, and considers that the heat radiation is uniformly radiated from the surface of the geometric body, and calculates the heat radiation intensity in combination with the view factor of the target point.

[0004] However, the point source method is not suitable for complex scenes due to its oversimplification; the solid flame model method is difficult to give a clear integral analysis for complex geometric shapes, which makes the calculation efficiency of the viewing angle factor of any target point around a pool fire in windy conditions inefficient. Summary of the invention

[0005] The present application provides a method, device and apparatus for calculating the viewing angle factor of a pool fire target point, so as to solve the defect of low efficiency of the method for calculating the viewing angle factor of a pool fire target point in the prior art.

[0006] In a first aspect, the present application provides a method for calculating a viewing angle factor of a pool fire target point, the method comprising:

[0007] Determine the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range, the key parameters include: pool fire center, pool fire inclination, pool fire height, pool fire radius;

[0008] Determine a pool fire image of a target point according to the key parameters, wherein the pool fire image of the target point is used to indicate an association relationship among the target point, a plurality of key reference points and the pool fire;

[0009] Determine the viewing angle factors of the multiple key reference points, and calculate the target viewing angle factor of the target point based on the multiple viewing angle factors and the target point pool fire image, wherein the viewing angle factor is used to indicate the correlation relationship between the corresponding position point and the thermal radiation intensity.

[0010] Optionally, determining the target point pool fire image according to the key parameters includes:

[0011] Determining the relative distance between the target point and the center of the pool fire;

[0012] Determining a dimensionless radius value of the target point relative to the pool fire radius according to the relative distance and the pool fire radius;

[0013] The target point pool fire image is determined based on the dimensionless radius value and the pool fire center.

[0014] Optionally, determining the target point pool fire image according to the dimensionless radius value and the pool fire center includes:

[0015] Taking the position of the center of the pool fire as the center of the circle and the dimensionless radius value as the radius, a corresponding circular image is drawn;

[0016] Determining the relative position of the target point in the circular image according to the position parameter of the target point, and determining the position of the target point in the circular image according to the relative position of the target point in the circular image;

[0017] Determine a plurality of key reference points of the target point according to the pool fire inclination angle, and determine the positions of the plurality of key reference points in the circular image according to the relative positions of the plurality of key reference points in the circular image;

[0018] Based on the positions of the target point and the multiple key reference points in the circular image, the target point and the multiple key reference points are marked on the circular image to obtain the target point pool fire image.

[0019] Optionally, the multiple key reference points include: an upwind reference point, a downwind reference point, and a crosswind reference point. According to the pool fire inclination angle, the multiple key reference points of the target point are determined, including:

[0020] determining the flame tendency according to the pool fire inclination angle;

[0021] Determine the opposite direction of the flame tendency as the upwind direction, and determine the upwind reference point of the target point according to the dimensionless radius value;

[0022] Determine the direction in which the flame tends to be a downwind direction, and determine a downwind reference point of the target point according to the dimensionless radius value;

[0023] According to the upwind reference point or the downwind direction, determining a direction perpendicular to the upwind reference point or the downwind direction as a crosswind direction;

[0024] A crosswind direction reference point of the target point is determined according to the dimensionless radius value.

[0025] Optionally, determining the viewing angle factors of the multiple key reference points includes:

[0026] Determining a dimensionless height value of the pool fire height relative to the pool fire radius according to the pool fire height and the pool fire radius;

[0027] According to the dimensionless height value and the pool fire inclination angle, the oblique cylindrical pool fire model is used to calculate the viewing angle factors of the upwind reference point and the downwind reference point, and the right cylindrical pool fire model is used to calculate the viewing angle factor of the crosswind reference point.

[0028] Optionally, calculating the target viewing angle factor of the target point according to the multiple viewing angle factors and the target point pool fire image includes:

[0029] Determine the position of the target point in the target point pool fire image;

[0030] If the target point is located between the crosswind reference point and the downwind reference point, a target viewing angle factor of the target point is calculated according to the angle between the target point and the downwind reference point and the viewing angle factors of the crosswind reference point and the downwind reference point;

[0031] If the target point is located between the crosswind reference point and the upwind reference point, the target viewing angle factor of the target point is calculated according to the angle between the target point and the downwind reference point and the viewing angle factors of the crosswind reference point and the upwind reference point.

[0032] Optionally, calculating the target viewing angle factor of the target point includes:

[0033] When the target point is located between the crosswind reference point and the downwind reference point, the target point viewing angle factor is calculated using the following formula:

[0034]

[0035] in, is the target point viewing angle factor, is the viewing angle factor of the downwind reference point, is the crosswind reference point viewing angle factor, is the angle between the target point and the downwind reference point;

[0036] When the target point is located between the crosswind reference point and the upwind reference point, the target point viewing angle factor is calculated using the following formula:

[0037]

[0038] in, is the target point viewing angle factor, is the crosswind reference point viewing angle factor, is the viewing angle factor of the upwind reference point, is the angle between the target point and the downwind reference point.

[0039] In a second aspect, the present application provides a device for calculating a viewing angle factor of a pool fire target point, the device comprising:

[0040] A determination module is used to determine key parameters of the pool fire according to environmental parameters corresponding to the pool fire range, wherein the key parameters include: pool fire center, pool fire inclination, pool fire height, and pool fire radius;

[0041] The determination module is further used to determine a target point pool fire image according to the key parameters, wherein the target point pool fire image is used to indicate the association relationship between the target point, multiple key reference points and the pool fire;

[0042] The determination module is further used to determine the viewing angle factors of the multiple key reference points;

[0043] The calculation module is used to calculate the target viewing angle factor of the target point according to multiple viewing angle factors and the pool fire image of the target point, and the viewing angle factor is used to indicate the correlation relationship between the corresponding position point and the thermal radiation intensity.

[0044] Optionally, the determination module is further used to determine the relative distance between the target point and the center of the pool fire;

[0045] The determination module is further used to determine the dimensionless radius value of the target point relative to the pool fire radius according to the relative distance and the pool fire radius;

[0046] The determination module is further used to determine the target point pool fire image according to the dimensionless radius value and the pool fire center.

[0047] Optionally, the computing device for the pool fire target point viewing angle factor further includes: a processing module;

[0048] The processing module is used to use the position of the pool fire center as the center of the circle and the dimensionless radius value as the radius to draw a corresponding circular image;

[0049] The determination module is further used to determine the relative position of the target point in the circular image according to the position parameters of the target point, and to determine the position of the target point in the circular image according to the relative position of the target point in the circular image;

[0050] The determination module is further used to determine a plurality of key reference points of the target point according to the pool fire inclination angle, and determine the positions of the plurality of key reference points in the circular image according to the relative positions of the plurality of key reference points in the circular image;

[0051] The processing module is used to mark the target point and the multiple key reference points on the circular image based on the positions of the target point and the multiple key reference points in the circular image to obtain the target point pool fire image.

[0052] Optionally, the determination module is further used to determine the flame tendency according to the pool fire inclination angle;

[0053] The determination module is further used to determine that the opposite direction of the flame tendency is the upwind direction, and determine the upwind reference point of the target point according to the dimensionless radius value;

[0054] The determination module is further used to determine that the direction of the flame tendency is downwind, and determine the downwind reference point of the target point according to the dimensionless radius value;

[0055] The determination module is further used to determine, based on the upwind reference point or the downwind direction, that a direction perpendicular to the upwind reference point or the downwind direction is a crosswind direction;

[0056] The determination module is further used to determine a crosswind direction reference point of the target point according to the dimensionless radius value.

[0057] Optionally, the determination module is further used to determine a dimensionless height value of the pool fire height relative to the pool fire radius according to the pool fire height and the pool fire radius;

[0058] The calculation module is also used to calculate the viewing angle factors of the upwind reference point and the downwind reference point based on the dimensionless height value and the pool fire inclination angle, using the oblique cylindrical pool fire model, and to calculate the viewing angle factor of the crosswind reference point using the right cylindrical pool fire model.

[0059] Optionally, the determination module is further used to determine the position of the target point in the target point pool fire image;

[0060] The calculation module is further configured to calculate a target viewing angle factor of the target point according to an angle between the target point and the downwind reference point and viewing angle factors of the crosswind reference point and the downwind reference point if the target point is located between the crosswind reference point and the downwind reference point;

[0061] The calculation module is also used to calculate the target viewing angle factor of the target point based on the angle between the target point and the downwind reference point and the viewing angle factors of the crosswind reference point and the upwind reference point if the target point is located between the crosswind reference point and the upwind reference point.

[0062] Optionally, the calculation module is further configured to calculate the viewing angle factor of the target point using the following formula when the target point is located between the crosswind reference point and the downwind reference point:

[0063]

[0064] in, is the target point viewing angle factor, is the viewing angle factor of the downwind reference point, is the crosswind reference point viewing angle factor, is the angle between the target point and the downwind reference point;

[0065] The calculation module is further configured to calculate the target point viewing angle factor by using the following formula when the target point is located between the crosswind reference point and the upwind reference point:

[0066]

[0067] in, is the target point viewing angle factor, is the crosswind reference point viewing angle factor, is the viewing angle factor of the upwind reference point, is the angle between the target point and the downwind reference point.

[0068] In a third aspect, the present application provides a device for calculating a pool fire target point viewing angle factor, comprising:

[0069] Memory;

[0070] processor;

[0071] Wherein, the memory stores computer-executable instructions;

[0072] The processor executes the computer-executable instructions stored in the memory to implement the method for calculating the viewing angle factor of a pool fire target point as described in the first aspect and various possible implementations of the first aspect.

[0073] In a fourth aspect, the present application provides a computer storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the method for calculating the viewing angle factor of a pool fire target point as described in the first aspect and various possible implementations of the first aspect.

[0074] The present application provides a method, device and equipment for calculating the viewing angle factor of a pool fire target point. Applied to the field of fire safety technology, the method determines the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range, and the key parameters include: pool fire center, pool fire inclination, pool fire height, and pool fire radius; determines the pool fire image of the target point according to the key parameters; determines the viewing angle factors of multiple key reference points, and calculates the target viewing angle factor of the target point according to the multiple viewing angle factors and the pool fire image of the target point. The viewing angle factor is used to indicate the correlation between the corresponding position point and the thermal radiation intensity, so as to improve the calculation efficiency of the viewing angle factor of any target point around the pool fire in windy conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0076] Figure 1 Schematic diagram of the calculation method of the pool fire target point viewing factor provided in this application Figure 1 ;

[0077] Figure 2 Schematic diagram of the calculation method of the pool fire target point viewing factor provided in this application Figure 2 ;

[0078] Figure 3 The target point pool fire image for the method for calculating the pool fire target point view factor provided in this application;

[0079] Figure 4 Schematic diagram of the calculation method of the pool fire target point viewing factor provided in this application Figure 3 ;

[0080] Figure 5 A schematic diagram of the structure of a device for calculating the viewing angle factor of a pool fire target point provided in this application;

[0081] Figure 6 A schematic diagram of the structure of a device for calculating the viewing angle factor of a pool fire target point provided in this application.

[0082] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0083] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0084] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein.

[0085] In the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0086] Fire safety technology is an important means to protect people's lives and property. Through scientific preventive measures, reasonable building design and effective emergency management, the harm caused by fire to people, property and the environment can be minimized, ensuring the fire safety of buildings, facilities and workplaces.

[0087] In the existing technology, the calculation methods of the viewing angle factor of the target point around the pool fire include the point source method, the solid flame model and the numerical simulation calculation based on computational fluid dynamics. The point source method is a simplified calculation model widely used in fire simulation and thermal radiation analysis. It simplifies the fire source into a point to calculate its thermal radiation impact on the surrounding environment. This method is simple in calculation and suitable for quick estimation and use in resource-constrained situations. It is commonly used in hand calculations or simple calculation tools made by individual developers. It is suitable for preliminary assessment of the impact of fire, especially when the fire is small or the accuracy requirement is not high.

[0088] In contrast, the solid flame model provides a more sophisticated way to simulate fire. This model treats the pool fire as a solid with a regular geometric shape, such as a cylinder in windless conditions or an inclined cylinder under the influence of wind. It assumes that the thermal radiation energy radiates outward uniformly from the flame surface and calculates the received thermal radiation intensity by considering the viewing factor of the target point relative to the flame. This method can more accurately simulate the thermal radiation effect of fire on a specific area or object, and is suitable for occasions that require higher precision analysis.

[0089] However, although the point source method is computationally convenient, its simplified model characteristics lead to large deviations in its prediction results when faced with complex scenarios; although the solid flame model has improved simulation accuracy, its processing ability for complex geometries is limited, and the calculation process is very cumbersome and inefficient, requiring a large amount of computing resources and time, which will affect the timeliness and effectiveness of decision-making in practical applications.

[0090] In view of the above problems, this application proposes a method, device and apparatus for calculating the view factor of a pool fire target point. The method provides a more accurate and efficient calculation method by comprehensively considering environmental parameters and key characteristics of pool fires, and by constructing a pool fire image of the target point and calculating the view factor, which is particularly suitable for pool fire simulation and thermal radiation assessment in windy conditions. The calculation efficiency of the view factor of any target point around a pool fire in windy conditions is improved.

[0091] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0092] Figure 1 A schematic diagram of a method for calculating the viewing angle factor of a pool fire target point provided in an application embodiment Figure 1 .like Figure 1 As shown, the method for calculating the viewing angle factor of a pool fire target point provided in this embodiment includes:

[0093] Among them, the environmental parameters around the pool fire are collected, including but not limited to wind speed, wind direction, temperature, humidity, and surrounding topography, etc. According to the environmental parameters corresponding to the pool fire range, the key parameters of the pool fire are determined, and the key parameters include: pool fire center, pool fire inclination, pool fire height, and pool fire radius.

[0094] By analyzing environmental parameters and fire source distribution, the center of the pool fire is determined, based on wind direction and wind speed; the pool fire inclination angle caused by wind is determined; the height from the center of the pool fire to the top of the flame is evaluated, which may involve direct measurement of the flame height or estimation based on environmental parameters to determine the pool fire height; the lateral extension range of the flame, that is, the pool fire radius, is determined.

[0095] During the development of the fire, the key parameters of the pool fire are updated in real time according to the environmental parameters corresponding to the pool fire range to reflect the dynamic changes of the fire. This can ensure that the fire simulation and analysis are always consistent with the actual situation and improve the real-time and effectiveness of the fire response.

[0096] S102, determining the target point pool fire image according to the key parameters.

[0097] Among them, the target point pool fire image is used to indicate the target point, multiple key reference points and the relationship between the pool fire. Integrate key parameters such as the pool fire center, pool fire inclination, pool fire height and pool fire radius to form a comprehensive data set; determine the location of the target point in the fire simulation environment, such as a specific observation point, building or other area that needs to be evaluated; select multiple key reference points related to the target point, which include the edge, center or other representative locations of the pool fire; use the key parameters and the location information of the target point to construct a pool fire image to simulate the shape, size and distribution of the flame; analyze the spatial correlation between the target point, key reference points and the pool fire, and add multiple key reference points to the pool fire image according to the spatial correlation to obtain the target point pool fire image.

[0098] Clarifying the location of the target point helps to assess the extent to which the point is affected by the pool fire. The selection of key reference points helps to analyze the spatial relationship between the target point and the pool fire in more detail. The analysis of the correlation relationship helps to determine the key reference points of the target point, thereby obtaining a pool fire image of the target point. The construction of the target point pool fire image provides an intuitive visual tool to help analysts and decision makers understand the morphology of the pool fire and its potential impact on the target point.

[0099] S103, determining the viewing angle factors of a plurality of key reference points, and calculating the target viewing angle factor of the target point according to the plurality of viewing angle factors and the pool fire image of the target point.

[0100] The viewing angle factors of multiple key reference points are determined, and the viewing angle factors are used to indicate the correlation between the corresponding position points and the thermal radiation intensity. The flame shape, size and thermal radiation characteristics are analyzed by using the constructed target point pool fire image, and the overall viewing angle factor of the target point is calculated based on the viewing angle factors of the key reference points and the target point pool fire image.

[0101] Determining the viewing factors of multiple key reference points can quantify the thermal radiation contribution of each reference point to the target point; the pool fire image of the target point helps to intuitively understand the potential impact of the flame on the target point and provide visual support for the integration of the viewing factors; the overall viewing factor of the target point is calculated. The calculation of the target viewing factor provides a comprehensive indicator for evaluating the thermal radiation reception of the target point, which helps to predict and quantify the thermal radiation intensity.

[0102] This embodiment proposes a method for calculating the viewing angle factor of a target point of a pool fire. The method determines key parameters of the pool fire according to environmental parameters corresponding to the pool fire range. The key parameters include: pool fire center, pool fire inclination, pool fire height, and pool fire radius; determines a pool fire image of the target point according to the key parameters; determines viewing angles of multiple key reference points, and calculates a target viewing angle of the target point according to the multiple viewing angles and the pool fire image of the target point. The viewing angle factor is used to indicate the correlation between the corresponding position point and the thermal radiation intensity, thereby improving the calculation efficiency of the viewing angle factor of any target point around a pool fire in windy conditions.

[0103] Figure 2 This is a flow chart of a method for calculating the viewing angle factor of a pool fire target point provided in an embodiment of the present application. Figure 2 This embodiment is in Figure 1 Based on the embodiment, the calculation method of the viewing angle factor of the pool fire target point is described in detail. Figure 2 As shown, the method for calculating the viewing angle factor of a pool fire target point provided in this embodiment includes:

[0104] S201. Determine key parameters of the pool fire according to environmental parameters corresponding to the pool fire range. The key parameters include: pool fire center, pool fire inclination, pool fire height, and pool fire radius.

[0105] Step S201 is the same as step S101 and will not be described again here.

[0106] S202, determining the relative distance between the target point and the center of the pool fire.

[0107] Among them, the position of the target point is accurately determined in the fire simulation environment, the center position of the pool fire is determined by analyzing the fire data and simulation, and the relative distance between the target point and the center of the pool fire is determined using appropriate measurement tools or algorithms.

[0108] S203. Determine a dimensionless radius value of the target point relative to the pool fire radius according to the relative distance and the pool fire radius.

[0109] Among them, according to the relative distance and the pool fire radius, the dimensionless radius value of the target point relative to the pool fire radius is determined. One possible implementation method is to divide the relative distance between the target point and the pool fire center by the pool fire radius to obtain the dimensionless radius value of the target point relative to the pool fire. The calculation of the dimensionless radius value provides a standardized indicator, so that fires of different sizes can evaluate the location of the target point under the same standard.

[0110] S204, taking the position of the center of the pool fire as the center of the circle and the dimensionless radius value as the radius, and drawing a corresponding circular image.

[0111] Among them, the position of the center of the pool fire is taken as the center of the circle, and the dimensionless radius value of the target point relative to the pool fire is used as the radius for drawing the circular image. On the fire simulation software or map, a circular image is drawn with the center of the circle as the center and the dimensionless radius value as the radius. Through the circular image, the fire influence range of the target point under different dimensionless radius values ​​is visualized.

[0112] Clearly identifying the position of the center of the circle helps determine the center point of the fire impact range. Applying dimensionless radius values ​​can standardize the impact range of fires of different sizes, so that the circular image can reflect the relative position and potential impact of the target point relative to the pool fire. The circular image intuitively shows the possible fire impact range of the target point under different dimensionless radius values, providing a visual tool for fire risk assessment.

[0113] S205 . Determine the relative position of the target point in the circular image according to the position parameters of the target point, and determine the position of the target point in the circular image according to the relative position of the target point in the circular image.

[0114] Among them, the position parameters of the target point are analyzed to determine its relative orientation and angle with the center of the circle, that is, the center of the pool fire. According to the relative position parameters of the target point, the relative position of the target point on the circular image is determined, and according to the relative position of the target point in the circular image, the position of the target point in the circular image is determined.

[0115] Accurately locating the target point in the circular image helps quantify its proximity to the fire impact area, providing more accurate data support for risk assessment.

[0116] S206. Determine multiple key reference points of the target point according to the inclination angle of the pool fire, and determine the positions of the multiple key reference points in the circular image according to the relative positions of the multiple key reference points in the circular image. The multiple key reference points include: an upwind reference point, a downwind reference point, and a crosswind reference point.

[0117] Among them, according to the inclination angle of the pool fire, the upwind reference point, downwind reference point, and crosswind reference point that may affect the target point are determined, and the relative position of each key reference point relative to the target point and the center of the circle, that is, the relative position of the pool fire center, is analyzed. According to the relative position parameters of multiple key reference points in the prototype image, the specific positions of multiple key reference points in the image are determined.

[0118] Identifying key reference points helps evaluate the possible impact of thermal radiation and smoke on the target point. Analyzing the relative positions helps determine the specific impact of each key reference point on the target point. Positioning key reference points in the circular image helps to intuitively display the relative relationship between multiple key reference points and the target point, providing a visual reference for formulating response measures.

[0119] S207 , based on the positions of the target point and the multiple key reference points in the circular image, marking the target point and the multiple key reference points on the circular image to obtain a pool fire image of the target point.

[0120] Among them, different symbols or colors are used to mark the target point and multiple key reference points on the circular image, and the position information of the target point and multiple key reference points is combined to construct a complete target point pool fire image, and the target point pool fire image is used to evaluate the fire impact range.

[0121] A possible implementation method is to determine the pool fire image of the target point according to the key parameters, and the obtained pool fire image of the target point is as follows: Figure 3 shown.

[0122] As shown in the figure, the center of the circle is the center of the pool fire, the radius of the image is the dimensionless radius value of the target point relative to the pool fire, point A is the target point, 1, 2, and 3 are wind directions determined according to the inclination angle of the pool fire, specifically, 1 is the downward direction of the target point, 2 is the upwind direction of the target point, and 3 is the sidewind direction of the target point. B1, B2, and B3 are multiple key reference points of target point A. Specifically, B1 is the upwind reference point of target point A, B2 is the downwind reference point of target point A, and B3 is the sidewind reference point of target point A.

[0123] S208, determining the position of the target point in the target point pool fire image.

[0124] The position of the target point in the target point pool fire image is determined, that is, whether the target point is between the crosswind reference point and the downwind reference point or between the crosswind reference point and the upwind reference point.

[0125] S209. When the target point is located between the crosswind reference point and the downwind reference point, a target viewing angle factor of the target point is calculated according to the angle between the target point and the downwind reference point and the viewing angle factors of the crosswind reference point and the downwind reference point.

[0126] When the target point is located between the crosswind reference point and the downwind reference point, the angle between the target point and the downwind reference point is measured, and the target viewing angle factor of the target point is calculated by combining the angle and the viewing angle factors of the crosswind reference point and the downwind reference point.

[0127] Based on the target viewing angle factor, emergency response measures such as evacuation routes and allocation of firefighting resources are planned to ensure that people and property in the target point area can be protected quickly and effectively when a fire occurs.

[0128] A possible implementation method: When the target point is located between the crosswind reference point and the downwind reference point, the target point viewing angle factor is calculated using the following formula:

[0129]

[0130] in, is the target point viewing angle factor, is the viewing angle factor of the downwind reference point, is the crosswind reference point viewing angle factor, is the angle between the target point and the downwind reference point.

[0131] S210. When the target point is located between the crosswind reference point and the upwind reference point, a target viewing angle factor of the target point is calculated according to the angle between the target point and the downwind reference point and the viewing angle factors of the crosswind reference point and the upwind reference point.

[0132] Among them, when the target point is located between the crosswind reference point and the upwind reference point, the angle between the target point and the downwind reference point is measured, and the target viewing angle factor of the target point is calculated by combining the angle and the viewing angle factors of the crosswind reference point and the upwind reference point, so as to evaluate the fire risk of the target point.

[0133] Based on the target viewing angle factor, emergency response measures such as evacuation routes and allocation of firefighting resources are planned to ensure that people and property in the target point area can be protected quickly and effectively when a fire occurs.

[0134] A possible implementation method: When the target point is located between the crosswind reference point and the upwind reference point, the target point viewing angle factor is calculated using the following formula:

[0135]

[0136] in, is the target point viewing angle factor, is the crosswind reference point viewing angle factor, is the viewing angle factor of the upwind reference point, is the angle between the target point and the downwind reference point.

[0137] This embodiment proposes a method for calculating the viewing angle factor of a target point of a pool fire, which determines the key parameters of the pool fire based on the pool fire range and environmental parameters, calculates the dimensionless radius value of the target point relative to the pool fire, draws a circular image with the center of the pool fire as the center and the dimensionless radius value as the radius, determines the key reference points of the upwind, downwind and crosswind directions and their positions in the circular image according to the inclination of the pool fire, constructs a pool fire image of the target point according to the relative positions of the target point and multiple key reference points, calculates the viewing angle of the target point based on the target point pool fire image and the viewing angle of multiple key reference points, and intuitively displays the impact of the fire through images, facilitates rapid identification and understanding of risk areas, and improves the accuracy of fire risk assessment.

[0138] Figure 4 This is a flow chart of a method for calculating the viewing angle factor of a pool fire target point provided in an embodiment of the present application. Figure 3 This embodiment is in Figure 1 Based on the embodiment, the calculation method of the viewing angle factor of the pool fire target point is described in detail. Figure 4 As shown, the method for calculating the viewing angle factor of a pool fire target point provided in this embodiment includes:

[0139] S401. Determine the flame tendency according to the pool fire inclination angle.

[0140] Among them, the main tendency of the flame is determined according to the inclination angle of the pool fire, that is, the direction in which the flame is tilted by external forces such as wind. Clarifying the flame tendency helps predict the possible spread path and affected areas of the flame, which is crucial for fire prevention and emergency response.

[0141] S402. Determine the opposite direction of the flame tendency as the upwind direction, and determine the upwind reference point of the target point according to the dimensionless radius value.

[0142] S403, determining the direction of the flame tendency as the downwind direction, and determining the downwind reference point of the target point according to the dimensionless radius value.

[0143] Among them, the opposite direction of the flame inclination is determined as the upwind direction, and the direction of the flame inclination is determined as the downwind direction. According to the dimensionless radius value and the pool fire inclination angle, the upwind reference point and the downwind reference point of the target point are determined.

[0144] S404. According to the upwind reference point or the downwind direction, determine the direction perpendicular to the upwind reference point or the downwind direction as the crosswind direction, and according to the dimensionless radius value, determine the crosswind reference point of the target point.

[0145] Among them, according to the upwind or downwind reference point, the crosswind direction perpendicular to these directions is determined, and according to the dimensionless radius value and the pool fire inclination angle, the crosswind reference point of the target point is determined.

[0146] The determination of upwind reference points, downwind reference points, and crosswind reference points provides specific analysis points for fire simulation and risk assessment, helps to comprehensively evaluate the potential impact of fire in different directions, and provides support for multi-angle risk analysis.

[0147] S405. Determine a dimensionless height value of the pool fire height relative to the pool fire radius according to the pool fire height and the pool fire radius.

[0148] Among them, according to the pool fire height and pool fire radius, the dimensionless height value of the pool fire height relative to the pool fire radius is calculated. The dimensionless height value provides a standardized measure of flame height, which is helpful for comparison and analysis among fires of different sizes.

[0149] S406. According to the dimensionless height value and the pool fire inclination angle, the oblique cylindrical pool fire model is used to calculate the viewing angle factors of the upwind reference point and the downwind reference point, and the right cylindrical pool fire model is used to calculate the viewing angle factor of the crosswind reference point.

[0150] Among them, the oblique cylindrical pool fire model is used to calculate the view factors of the upwind reference point and the downwind reference point by combining the dimensionless height value and the pool fire inclination angle, and the right cylindrical pool fire model is used to calculate the view factor of the crosswind reference point. The view factors of multiple reference points provide a basis for evaluating the view factors of the target points. The view factors of the target points provide a quantitative index for the intensity of thermal radiation received by the target points, which helps to formulate more effective fire response measures.

[0151] This embodiment proposes a method for calculating the viewing angle factor of a pool fire target point. The method determines the flame inclination and the opposite direction, locates the upwind and downwind reference points based on the dimensionless radius value, and then determines the crosswind reference point. The viewing angle factor is calculated using the dimensionless height value and the inclination angle, thereby simplifying the calculation process and improving the calculation efficiency of the viewing angle factor of the target point.

[0152] Figure 5 A schematic diagram of a calculation device for a pool fire target point viewing angle factor provided in this application is shown in FIG. Figure 5 As shown, the computing device 500 for the pool fire target point viewing angle factor provided in this embodiment includes:

[0153] The determination module 501 is used to determine the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range, and the key parameters include: pool fire center, pool fire inclination, pool fire height, and pool fire radius;

[0154] The determination module 501 is further used to determine a target point pool fire image according to the key parameters, wherein the target point pool fire image is used to indicate the association relationship between the target point, multiple key reference points and the pool fire;

[0155] The determination module 501 is further used to determine the viewing angle factors of the multiple key reference points;

[0156] The calculation module 502 is used to calculate the target viewing factor of the target point based on multiple viewing factors and the pool fire image of the target point, and the viewing factor is used to indicate the correlation relationship between the corresponding position point and the thermal radiation intensity.

[0157] Optionally, the determination module 501 is further used to determine the relative distance between the target point and the center of the pool fire;

[0158] The determination module 501 is further used to determine the dimensionless radius value of the target point relative to the pool fire radius according to the relative distance and the pool fire radius;

[0159] The determination module 501 is further used to determine the target point pool fire image according to the dimensionless radius value and the pool fire center.

[0160] Optionally, the computing device for the pool fire target point viewing angle factor further includes: a processing module 503;

[0161] The processing module 503 is used to use the position of the pool fire center as the center of the circle and the dimensionless radius value as the radius to draw a corresponding circular image;

[0162] The determination module 501 is further used to determine the relative position of the target point in the circular image according to the position parameter of the target point, and determine the position of the target point in the circular image according to the relative position of the target point in the circular image;

[0163] The determination module 501 is further used to determine a plurality of key reference points of the target point according to the pool fire inclination angle, and determine the positions of the plurality of key reference points in the circular image according to the relative positions of the plurality of key reference points in the circular image;

[0164] The processing module 503 is used to mark the target point and the multiple key reference points on the circular image based on the positions of the target point and the multiple key reference points in the circular image to obtain the target point pool fire image.

[0165] Optionally, the determination module 501 is further used to determine the flame tendency according to the pool fire inclination angle;

[0166] The determination module 501 is further used to determine that the opposite direction of the flame tendency is the upwind direction, and determine the upwind reference point of the target point according to the dimensionless radius value;

[0167] The determination module 501 is further used to determine that the direction of the flame tendency is downwind, and determine the downwind reference point of the target point according to the dimensionless radius value;

[0168] The determination module 501 is further configured to determine, based on the upwind reference point or the downwind direction, that a direction perpendicular to the upwind reference point or the downwind direction is a crosswind direction;

[0169] The determination module 501 is further configured to determine a crosswind direction reference point of the target point according to the dimensionless radius value.

[0170] Optionally, the determination module 501 is further used to determine a dimensionless height value of the pool fire height relative to the pool fire radius according to the pool fire height and the pool fire radius;

[0171] The calculation module 502 is also used to calculate the viewing angle factors of the upwind reference point and the downwind reference point based on the dimensionless height value and the pool fire inclination angle, using the oblique cylindrical pool fire model, and to calculate the viewing angle factor of the crosswind reference point using the right cylindrical pool fire model.

[0172] Optionally, the determination module 501 is further used to determine the position of the target point in the target point pool fire image;

[0173] The calculation module 502 is further configured to calculate a target viewing angle factor of the target point according to an angle between the target point and the downwind reference point and viewing angle factors of the crosswind reference point and the downwind reference point if the target point is located between the crosswind reference point and the downwind reference point;

[0174] The calculation module 502 is also used to calculate the target viewing angle factor of the target point according to the angle between the target point and the downwind reference point and the viewing angle factors of the crosswind reference point and the upwind reference point if the target point is located between the crosswind reference point and the upwind reference point.

[0175] Optionally, the calculation module 502 is further configured to calculate the viewing angle factor of the target point by using the following formula when the target point is located between the crosswind reference point and the downwind reference point:

[0176]

[0177] in, is the target point viewing angle factor, is the viewing angle factor of the downwind reference point, is the crosswind reference point viewing angle factor, is the angle between the target point and the downwind reference point;

[0178] The calculation module 502 is further configured to calculate the target point viewing angle factor by using the following formula when the target point is located between the crosswind reference point and the upwind reference point:

[0179]

[0180] in, is the target point viewing angle factor, is the crosswind reference point viewing angle factor, is the viewing angle factor of the upwind reference point, is the angle between the target point and the downwind reference point.

[0181] Figure 6 This is a schematic diagram of the structure of a device for calculating the viewing angle factor of a pool fire target point provided in this application. Figure 6 As shown, the present application provides a device for calculating a pool fire target point viewing angle factor. The device 600 for calculating a pool fire target point viewing angle factor includes: a receiver 601 , a transmitter 602 , a processor 603 , and a memory 604 .

[0182] Receiver 601, used for receiving instructions and data;

[0183] A transmitter 602, used for sending instructions and data;

[0184] Memory 604, used to store computer-executable instructions;

[0185] The processor 603 is used to execute the computer-executable instructions stored in the memory 604 to implement the various steps executed by the method for calculating the viewing angle factor of the pool fire target point in the above embodiment. For details, please refer to the relevant description in the above embodiment of the method for calculating the viewing angle factor of the pool fire target point.

[0186] Optionally, the memory 604 may be independent or integrated with the processor 603 .

[0187] When the memory 604 is independently provided, the electronic device further includes a bus for connecting the memory 604 and the processor 603 .

[0188] The present application also provides a computer storage medium, in which computer execution instructions are stored. When a processor executes the computer execution instructions, a method for calculating a pool fire target point viewing angle factor as performed by the above-mentioned pool fire target point viewing angle factor calculation device is implemented.

[0189] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0190] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0191] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for calculating the viewing angle factor of a pool fire target point, characterized in that: The method comprises: Determine the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range, the key parameters include: pool fire center, pool fire inclination, pool fire height, pool fire radius; Determine a pool fire image of a target point according to the key parameters, wherein the pool fire image of the target point is used to indicate an association relationship among the target point, a plurality of key reference points and the pool fire; Determine the viewing angle factors of the multiple key reference points, and calculate the target viewing angle factor of the target point based on the multiple viewing angle factors and the target point pool fire image, wherein the viewing angle factor is used to indicate the correlation relationship between the corresponding position point and the thermal radiation intensity.

2. The method according to claim 1, characterized in that Determining the target point pool fire image according to the key parameters includes: Determining the relative distance between the target point and the center of the pool fire; Determining a dimensionless radius value of the target point relative to the pool fire radius according to the relative distance and the pool fire radius; The target point pool fire image is determined based on the dimensionless radius value and the pool fire center.

3. The method according to claim 2, characterized in that Determining the target point pool fire image according to the dimensionless radius value and the pool fire center includes: Taking the position of the center of the pool fire as the center of the circle and the dimensionless radius value as the radius, a corresponding circular image is drawn; Determining the relative position of the target point in the circular image according to the position parameters of the target point, and determining the position of the target point in the circular image according to the relative position of the target point in the circular image; Determine a plurality of key reference points of the target point according to the pool fire inclination angle, and determine the positions of the plurality of key reference points in the circular image according to the relative positions of the plurality of key reference points in the circular image; Based on the positions of the target point and the multiple key reference points in the circular image, the target point and the multiple key reference points are marked on the circular image to obtain the target point pool fire image.

4. The method according to claim 3, characterized in that The multiple key reference points include: an upwind reference point, a downwind reference point, and a crosswind reference point. According to the pool fire inclination angle, the multiple key reference points of the target point are determined, including: determining the flame tendency according to the pool fire inclination angle; Determine the opposite direction of the flame tendency as the upwind direction, and determine the upwind reference point of the target point according to the dimensionless radius value; Determine the direction in which the flame tends to be a downwind direction, and determine a downwind reference point of the target point according to the dimensionless radius value; According to the upwind reference point or the downwind direction, determining a direction perpendicular to the upwind reference point or the downwind direction as a crosswind direction; A crosswind direction reference point of the target point is determined according to the dimensionless radius value.

5. The method according to claim 4, characterized in that The determining of the viewing angle factors of the plurality of key reference points comprises: Determining a dimensionless height value of the pool fire height relative to the pool fire radius according to the pool fire height and the pool fire radius; According to the dimensionless height value and the pool fire inclination angle, the oblique cylindrical pool fire model is used to calculate the viewing angle factors of the upwind reference point and the downwind reference point, and the right cylindrical pool fire model is used to calculate the viewing angle factor of the crosswind reference point.

6. The method according to claim 5, characterized in that The step of calculating the target viewing angle factor of the target point according to the plurality of viewing angle factors and the target point pool fire image comprises: Determine the position of the target point in the target point pool fire image; If the target point is located between the crosswind reference point and the downwind reference point, a target viewing angle factor of the target point is calculated according to the angle between the target point and the downwind reference point and the viewing angle factors of the crosswind reference point and the downwind reference point; If the target point is located between the crosswind reference point and the upwind reference point, the target viewing angle factor of the target point is calculated according to the angle between the target point and the downwind reference point and the viewing angle factors of the crosswind reference point and the upwind reference point.

7. The method according to claim 6, characterized in that The step of calculating the target viewing angle factor of the target point includes: When the target point is located between the crosswind reference point and the downwind reference point, the target point viewing angle factor is calculated using the following formula: in, is the viewing angle factor of the target point, is the viewing angle factor of the downwind reference point, is the crosswind reference point viewing angle factor, is the angle between the target point and the downwind reference point; When the target point is located between the crosswind reference point and the upwind reference point, the target point viewing angle factor is calculated using the following formula: in, is the viewing angle factor of the target point, is the crosswind reference point viewing angle factor, is the viewing angle factor of the upwind reference point, is the angle between the target point and the downwind reference point.

8. A device for calculating the viewing angle factor of a pool fire target point, characterized in that: The device comprises: A determination module is used to determine key parameters of the pool fire according to environmental parameters corresponding to the pool fire range, wherein the key parameters include: pool fire center, pool fire inclination, pool fire height, and pool fire radius; The determination module is further used to determine a target point pool fire image according to the key parameters, wherein the target point pool fire image is used to indicate the association relationship between the target point, multiple key reference points and the pool fire; The determination module is further used to determine the viewing angle factors of the plurality of key reference points; The calculation module is used to calculate the target viewing angle factor of the target point according to multiple viewing angle factors and the pool fire image of the target point, and the viewing angle factor is used to indicate the correlation relationship between the corresponding position point and the thermal radiation intensity.

9. A device for calculating the viewing angle factor of a pool fire target point, characterized in that: include: Memory; processor; Wherein, the memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method for calculating the pool fire target point viewing angle factor according to any one of claims 1 to 7.

10. A computer storage medium, characterized in that: The computer storage medium stores computer executable instructions, which are used to implement the method for calculating the viewing angle factor of a pool fire target point according to any one of claims 1 to 7 when executed by a processor.

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