Calculation Method, Device and Equipment for View Factor of Pool Fire Target Point

Abstract

The present application provides a method, device and equipment for calculating the view factor of a target point in a pool fire. Applied to the field of fire safety technology, this method determines the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range. The key parameters include: the center of the pool fire, the inclination angle of the pool fire, the height of the pool fire, and the radius of the pool fire; determines the pool fire image of the target point according to the key parameters; determines the view factors of multiple key reference points, and calculates the target view factor of the target point according to the multiple view factors and the pool fire image of the target point. The view factor is used to indicate the correlation between the corresponding position point and the heat radiation intensity, improving the calculation efficiency of the view factor of any target point around the pool fire under windy conditions.

Description

Technical Field

[0001] This application belongs to the field of fire safety technology, and particularly relates to a method, device, and equipment for calculating the view 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 fires to people, property, and the environment. It aims to ensure the fire safety of buildings, facilities, and workplaces, as well as effectively respond to emergency situations during a fire.

[0003] In the existing technology, the calculation methods for the view factor of a target point around a pool fire include the point source method, the solid flame model, and numerical simulation calculations based on computational fluid dynamics. The point source method is a simplified calculation model, usually used in hand calculations or calculation tools made by individual developers; the solid flame model abstracts the pool fire as a regular geometric body, such as a cylinder without wind and an inclined cylinder with wind, assumes that heat radiation is uniformly radiated from the surface of the geometric body, and combines the view factor of the target point to calculate the heat radiation intensity.

[0004] However, due to its excessive simplification, the point source method is not applicable to complex scenarios; the solid flame model method is difficult to give a clear integral analysis for complex geometric body shapes, resulting in low calculation efficiency for the view factor of any target point around a pool fire in the presence of wind. Summary of the Invention

[0005] This application provides a method, device, and equipment for calculating the view factor of a pool fire target point. It is used to solve the defect of low calculation efficiency of the existing method for calculating the view factor of a pool fire target point.

[0006] In a first aspect, this application provides a method for calculating the view factor of a pool fire target point, which includes:

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

[0008] Determine the pool fire image of the target point according to the key parameters, where the pool fire image of the target point is used to indicate the correlation between the target point, multiple key reference points, and the pool fire;

[0009] Determine the view factors of the multiple key reference points, and calculate the target view factor of the target point according to the multiple view factors and the pool fire image of the target point, where the view factor is used to indicate the correlation between the corresponding position point and the heat radiation intensity.

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

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

[0012] According to the relative distance and the radius of the pool fire, determine the dimensionless radius value of the target point relative to the pool fire radius;

[0013] According to the dimensionless radius value and the center of the pool fire, determine the pool fire image of the target point.

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

[0015] Take the position of the center of the pool fire as the center of the circle, and take the dimensionless radius value as the radius, and draw a corresponding circular image;

[0016] According to the position parameters of the target point, determine the relative position of the target point in the circular image, and according to the relative position of the target point in the circular image, determine the position of the target point in the circular image;

[0017] According to the pool fire inclination angle, determine multiple key reference points of the target point, and according to the relative positions of the multiple key reference points in the circular image, determine the positions of the multiple 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, mark the target point and the multiple key reference points on the circular image to obtain the pool fire image of the target point.

[0019] Optionally, the multiple key reference points include: an upwind reference point, a downwind reference point, and a crosswind reference point. Determining the multiple key reference points of the target point according to the pool fire inclination angle includes:

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

[0021] When it is determined that the direction of the flame tendency is the upwind direction, according to the dimensionless radius value, determine the upwind reference point of the target point;

[0022] When it is determined that the direction of the flame tendency is the downwind direction, according to the dimensionless radius value, determine the downwind reference point of the target point;

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

[0024] According to the dimensionless radius value, determine the crosswind reference point of the target point.

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

[0026] Determine the 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, use the inclined cylindrical pool fire model to calculate the view factors of the upwind reference point and the downwind reference point, and use the regular cylindrical pool fire model to calculate the view factors of the sidewind reference point.

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

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

[0030] If the target point is located between the sidewind reference point and the downwind reference point, calculate the target view factor of the target point according to the angle between the target point and the downwind reference point and the view factors of the sidewind reference point and the downwind reference point;

[0031] If the target point is located between the sidewind reference point and the upwind reference point, calculate the target view factor of the target point according to the angle between the target point and the downwind reference point and the view factors of the sidewind reference point and the upwind reference point.

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

[0033] When the target point is located between the sidewind reference point and the downwind reference point, calculate the target view factor of the target point using the following formula:

[0034]

[0035] Wherein, is the target view factor, is the downwind reference point view factor, is the sidewind reference point view factor, is the angle between the target point and the downwind reference point;

[0036] When the target point is located between the sidewind reference point and the upwind reference point, calculate the target view factor of the target point using the following formula:

[0037]

[0038] Wherein, is the target view factor, is the perspective factor of the side wind reference point is the perspective factor of the upwind reference point is the included angle between the target point and the downwind reference point

[0039] In a second aspect, the present application provides a calculation device for the perspective factor of a pool fire target point. The device includes:

[0040] A determination module, configured to determine key parameters of the pool fire according to environmental parameters corresponding to the pool fire range. The key parameters include: the center of the pool fire, the inclination angle of the pool fire, the height of the pool fire, and the radius of the pool fire;

[0041] The determination module is further configured to determine a pool fire image of the target point according to the key parameters. The pool fire image of the target point 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 configured to determine the perspective factors of the multiple key reference points;

[0043] A calculation module, configured to calculate the target perspective factor of the target point according to multiple perspective factors and the pool fire image of the target point. The perspective factor is used to indicate the association relationship between the corresponding position point and the heat radiation intensity.

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

[0045] The determination module is further configured to 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;

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

[0047] Optionally, the calculation device for the perspective factor of the pool fire target point further includes: a processing module;

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

[0049] The determination module is further configured to 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;

[0050] The determining module is further configured 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 configured to mark the target point and the plurality of key reference points on the circular image based on the positions of the target point and the plurality of key reference points in the circular image, so as to obtain the target point pool fire image.

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

[0053] When the determining module determines that the direction of the flame tendency is the upwind direction, it is further configured to determine the upwind reference point of the target point according to the dimensionless radius value;

[0054] When the determining module determines that the direction of the flame tendency is the downwind direction, it is further configured to determine the downwind reference point of the target point according to the dimensionless radius value;

[0055] The determining module is further configured to determine the direction perpendicular to the upwind reference point or the downwind reference point as the crosswind direction according to the upwind reference point or the downwind reference point;

[0056] The determining module is further configured to determine the crosswind reference point of the target point according to the dimensionless radius value.

[0057] Optionally, the determining module is further configured to determine the 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 calculating module is further configured to calculate the view factor of the upwind reference point and the downwind reference point by using an inclined cylinder pool fire model according to the dimensionless height value and the pool fire inclination angle, and calculate the view factor of the crosswind reference point by using a regular cylinder pool fire model.

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

[0060] If the target point is located between the crosswind reference point and the downwind reference point, the calculating module is further configured to calculate the target view factor of the target point according to the included angle between the target point and the downwind reference point and the view factors of the crosswind reference point and the downwind reference point;

[0061] The calculation module is further configured to, if the target point is located between the side-wind reference point and the up-wind reference point, calculate the target view factor of the target point according to the angle between the target point and the down-wind reference point and the view factors of the side-wind reference point and the up-wind reference point.

[0062] Optionally, when the target point is located between the side-wind reference point and the down-wind reference point, the calculation module is further configured to calculate the view factor of the target point by using the following formula:

[0063]

[0064] where is the view factor of the target point, is the view factor of the down-wind reference point, is the view factor of the side-wind reference point, is the angle between the target point and the down-wind reference point;

[0065] When the target point is located between the side-wind reference point and the up-wind reference point, the view factor of the target point is calculated by using the following formula:

[0066]

[0067] where is the view factor of the target point, is the view factor of the side-wind reference point, is the view factor of the up-wind reference point, is the angle between the target point and the down-wind reference point.

[0068] In a third aspect, the present application provides a calculation device for the view factor of a pool fire target point, including:

[0069] a memory;

[0070] a processor;

[0071] wherein the memory stores computer-executable instructions;

[0072] The processor executes the computer-executable instructions stored in the memory to implement the calculation method for the view factor of the pool fire target point as described in the first aspect and various possible implementation manners of the first aspect.

[0073] In a fourth aspect, the present application provides a computer storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the calculation method for the view factor of the pool fire target point as described in the first aspect and various possible implementation manners of the first aspect.

[0074] The present application provides a method, apparatus, and device for calculating the view factor of a pool fire target point. Applied to the field of fire safety technology, this method determines the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range. The key parameters include: the center of the pool fire, the inclination angle of the pool fire, the height of the pool fire, and the radius of the pool fire. According to the key parameters, the pool fire image of the target point is determined. The view factors of multiple key reference points are determined, and according to the multiple view factors and the pool fire image of the target point, the target view factor of the target point is calculated. The view factor is used to indicate the correlation between the corresponding position point and the heat radiation intensity, improving the calculation efficiency of the view factor of any target point around the pool fire under windy conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] The accompanying drawings are incorporated herein and form a part of this specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0076] Figure 1 Schematic flow of the method for calculating the view factor of the pool fire target point provided by the present application Figure 1 ;

[0077] Figure 2 Schematic flow of the method for calculating the view factor of the pool fire target point provided by the present application Figure 2 ;

[0078] Figure 3 Pool fire image of the target point of the method for calculating the view factor of the pool fire target point provided by the present application;

[0079] Figure 4 Schematic flow of the method for calculating the view factor of the pool fire target point provided by the present application Figure 3 ;

[0080] Figure 5 Schematic structural diagram of the apparatus for calculating the view factor of the pool fire target point provided by the present application;

[0081] Figure 6 Schematic structural diagram of the device for calculating the view factor of the pool fire target point provided by the present application.

[0082] Through the above accompanying drawings, specific embodiments of the present application have been shown, and there will be a more detailed description hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept 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 OF THE EMBODIMENTS

[0083] To make the objectives, 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 accompanying drawings in this application. Apparently, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0084] In the description of the present invention and the claims, as well as in the above-mentioned accompanying drawings, the terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order different from those illustrated or described here.

[0085] In the embodiments of this application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

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

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

[0088] Relatively speaking, the solid flame model provides a more refined way of fire simulation. This model regards the pool fire as an entity with a regular geometric shape, such as a cylinder under windless conditions or an inclined cylinder under the influence of wind. It assumes that the thermal radiation energy radiates uniformly outward from the flame surface, and calculates the received thermal radiation intensity by considering the view factor of the target point relative to the flame. This method can more accurately simulate the thermal radiation effect of the fire on a specific area or object, and is applicable to occasions that require high-precision analysis.

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

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

[0091] The technical solution of the present application and how the technical solution of the present application solves the above technical problems will be described in detail below with specific embodiments. These specific embodiments below 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 with reference to the accompanying drawings.

[0092] Figure 1 Flow schematic of a calculation method for the view factor of a target point in a pool fire provided by an embodiment of the application Figure 1 . As Figure 1 shown, the calculation method for the view factor of a target point in a pool fire provided in this embodiment includes:

[0093] S101. Determine the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range.

[0094] Among them, collect the environmental parameters around the pool fire, including but not limited to wind speed, wind direction, temperature, humidity, and surrounding terrain and landforms. Determine the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range. The key parameters include: the center of the pool fire, the inclination angle of the pool fire, the height of the pool fire, and the radius of the pool fire.

[0095] By analyzing environmental parameters and the distribution of the fire source, determine the center of the pool fire. According to the wind direction and wind speed, determine the inclination angle of the pool fire caused by the wind force. Evaluate the height from the center of the pool fire to the top of the flame, which may involve direct measurement of the flame height or estimation based on environmental parameters, so as to determine the height of the pool fire. Determine the lateral spread range of the flame, that is, the radius of the pool fire.

[0096] During the development of the fire, update the key parameters of the pool fire in real time according to the environmental parameters corresponding to the pool fire range to reflect the dynamic changes of the fire, which can ensure that the fire simulation and analysis are always consistent with the actual situation and improve the timeliness and effectiveness of dealing with the fire.

[0097] S102. Determine the pool fire image of the target point according to the key parameters.

[0098] Among them, the pool fire image of the target point is used to indicate the correlation between the target point, multiple key reference points and the pool fire. Integrate key parameters such as the center of the pool fire, the inclination angle of the pool fire, the height of the pool fire and the radius of the pool fire to form a comprehensive data set; determine the position of the target point in the fire simulation environment, which may be a specific observation point, building or other area to be evaluated; select multiple key reference points related to the target point, and these key reference points include the edge, center of the pool fire or other representative positions; use the key parameters and the position 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, the 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 pool fire image of the target point.

[0099] Defining the position of the target point helps to evaluate the degree to which the point is affected by the pool fire. The selection of key reference points helps to more carefully analyze the spatial relationship between the target point and the pool fire. The analysis of the correlation helps to determine the key reference points of the target point, so as to obtain the pool fire image of the target point. The construction of the pool fire image of the target point provides an intuitive visual tool to help analysts and decision-makers understand the shape of the pool fire and its potential impact on the target point.

[0100] S103. Determine the view factors of multiple key reference points, and calculate the target view factor of the target point according to the multiple view factors and the pool fire image of the target point.

[0101] Among them, determine the view factors of multiple key reference points, and the view factors are used to indicate the correlation between the corresponding position points and the heat radiation intensity. Use the constructed pool fire image of the target point to analyze the shape, size and heat radiation characteristics of the flame, and calculate the overall view factor of the target point according to the view factors of the key reference points and the pool fire image of the target point.

[0102] Determining the view 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 provides visual support for the integration of view factors; calculating the overall view factor of the target point, and the calculation of the target view factor provides a comprehensive index for evaluating the thermal radiation received by the target point, which helps to predict and quantify the thermal radiation intensity.

[0103] This embodiment proposes a method for calculating the view factor of the target point of a pool fire. This method determines the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range. The key parameters include: the center of the pool fire, the inclination angle of the pool fire, the height of the pool fire, and the radius of the pool fire; according to the key parameters, determine the pool fire image of the target point; determine the view factors of multiple key reference points, and calculate the target view factor of the target point according to the multiple view factors and the pool fire image of the target point. The view factor is used to indicate the correlation between the corresponding position point and the thermal radiation intensity, improving the calculation efficiency of the view factor of any target point around the pool fire under windy conditions.

[0104] Figure 2 It is a flow schematic of a method for calculating the view factor of the target point of a pool fire provided by an embodiment of the present application. Figure 2 This embodiment is based on Figure 1 the embodiment, and details the method for calculating the view factor of the target point of the pool fire. As Figure 2 shown, the method for calculating the view factor of the target point of the pool fire provided by this embodiment includes:

[0105] S201. Determine the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range. The key parameters include: the center of the pool fire, the inclination angle of the pool fire, the height of the pool fire, and the radius of the pool fire.

[0106] Step S201 is the same as step S101 and will not be elaborated here.

[0107] S202. Determine the relative distance between the target point and the center of the pool fire.

[0108] Among them, accurately determine the position of the target point in the fire simulation environment, determine the center position of the pool fire by analyzing fire data and simulations, and use appropriate measurement tools or algorithms to determine the relative distance between the target point and the center of the pool fire.

[0109] S203. 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.

[0110] 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. A possible implementation method is to divide the relative distance between the target point and the center of the pool fire 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 index, enabling fires of different scales to evaluate the position of the target point under the same standard.

[0111] S204. Take the position of the center of the pool fire as the center of the circle, and use the dimensionless radius value as the radius to draw the corresponding circular image.

[0112] Among them, take the position of the center of the pool fire as the center of the circle, and use the dimensionless radius value of the target point relative to the pool fire as the radius for drawing the circular image. On the fire simulation software or map, with the center of the circle as the center and the dimensionless radius value as the radius, draw the circular image. Through the circular image, visualize the fire influence range of the target point under different dimensionless radius values.

[0113] Defining the position of the center of the circle helps to determine the center point of the fire influence range. Applying the dimensionless radius value can standardize the influence range of fires of different scales, enabling the circular image to reflect the relative position and potential influence of the target point relative to the pool fire. The circular image intuitively shows the fire influence range that the target point may be subject to under different dimensionless radius values, providing a visualization tool for fire risk assessment.

[0114] S205. According to the position parameters of the target point, determine the relative position of the target point in the circular image, and based on the relative position of the target point in the circular image, determine the position of the target point in the circular image.

[0115] Among them, analyze the position parameters of the target point to determine its relative orientation and angle with respect to the center of the circle, that is, the center of the pool fire. According to the relative position parameters of the target point, determine the relative position of the target point on the circular image, and based on the relative position of the target point in the circular image, determine the position of the target point in the circular image.

[0116] Precisely positioning the target point in the circular image helps to quantify its proximity to the fire influence range, providing more accurate data support for risk assessment.

[0117] S206. According to the pool fire inclination angle, determine multiple key reference points of the target point, and based on the relative positions of the multiple key reference points in the circular image, determine the positions of the multiple key reference points in the circular image. The multiple key reference points include: the upwind reference point, the downwind reference point, and the crosswind reference point.

[0118] Among them, according to the pool fire inclination angle, determine the upwind reference point, downwind reference point, and crosswind reference point that may affect the target point, and analyze the relative positions of each key reference point with respect to the target point and the center of the circle, that is, the relative position of the pool fire center. According to the relative position parameters of multiple key reference points in the prototype image, determine the specific positions of multiple key reference points in the image.

[0119] Identifying key reference points helps to evaluate the possible heat radiation and smoke effects on the target point. Analyzing the relative positions helps to determine the specific effects of each key reference point on the target point. Locating key reference points in the circular image helps to visually display the relative relationships between multiple key reference points and the target point, providing a visual reference for formulating countermeasures.

[0120] S207. Based on the positions of the target point and multiple key reference points in the circular image, mark the target point and multiple key reference points on the circular image to obtain the target point pool fire image.

[0121] Among them, use different symbols or colors on the circular image to mark the target point and multiple key reference points. Combine the position information of the target point and multiple key reference points to construct a complete target point pool fire image, and use the target point pool fire image to evaluate the fire impact range.

[0122] A possible implementation method is to determine the pool fire image of the target point according to the key parameters, and the obtained target point pool fire image is as Figure 3 shown.

[0123] As shown in the figure, the center of the circle is the pool fire center, 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 the wind directions determined according to the pool fire inclination angle. Specifically, 1 is the downwind direction of the target point, 2 is the upwind direction of the target point, 3 is the crosswind direction of the target point, and B1, B2, and B3 are multiple key reference points of the target point A. Specifically, B1 is the upwind reference point of the target point A, B2 is the downwind reference point of the target point A, and B3 is the crosswind reference point of the target point A.

[0124] S208. Determine the position of the target point in the target point pool fire image.

[0125] Among them, determining the position of the target point in the target point pool fire image means determining whether the target point is located between the crosswind reference point and the downwind reference point or between the crosswind reference point and the upwind reference point.

[0126] S209. When the target point is located between the crosswind reference point and the downwind reference point, calculate the target view factor of the target point according to the angle between the target point and the downwind reference point and the view factors of the crosswind reference point and the downwind reference point.

[0127] Among them, when the target point is between the side-wind reference point and the down-wind reference point, measure the angle between the target point and the down-wind reference point, and combine the angle and the view factors of the side-wind reference point and the down-wind reference point to calculate the target view factor of the target point.

[0128] According to the target view factor, plan emergency response measures such as evacuation routes and fire resource allocation to ensure that the personnel and property in the target point area can be quickly and effectively protected in case of a fire.

[0129] A possible implementation. When the target point is between the side-wind reference point and the down-wind reference point, use the following formula to calculate the view factor of the target point:

[0130]

[0131] Among them, is the view factor of the target point, is the view factor of the down-wind reference point, is the view factor of the side-wind reference point, is the angle between the target point and the down-wind reference point.

[0132] S210. When the target point is between the side-wind reference point and the up-wind reference point, calculate the target view factor of the target point according to the angle between the target point and the down-wind reference point and the view factors of the side-wind reference point and the up-wind reference point.

[0133] Among them, when the target point is between the side-wind reference point and the up-wind reference point, measure the angle between the target point and the down-wind reference point, and combine the angle and the view factors of the side-wind reference point and the up-wind reference point to calculate the target view factor of the target point, so as to evaluate the fire risk of the target point.

[0134] According to the target view factor, plan emergency response measures such as evacuation routes and fire resource allocation to ensure that the personnel and property in the target point area can be quickly and effectively protected in case of a fire.

[0135] A possible implementation. When the target point is between the side-wind reference point and the up-wind reference point, use the following formula to calculate the view factor of the target point:

[0136]

[0137] Among them, is the view factor of the target point, is the view factor of the side-wind reference point, is the view factor of the up-wind reference point, is the angle between the target point and the down-wind reference point.

[0138] This embodiment proposes a calculation method for the view factor of a target point in a pool fire. This method 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 in the upwind, downwind, and sidewind directions and their positions in the circular image according to the pool fire inclination angle, constructs a target point pool fire image based on the relative positions of the target point and multiple key reference points, and calculates the view factor of the target point according to the view factors of the target point pool fire image and multiple key reference points. The fire impact is visually displayed through the image, facilitating the rapid identification and understanding of the risk area and improving the accuracy of fire risk assessment.

[0139] Figure 4 It is a flow schematic of a calculation method for the view factor of a target point in a pool fire provided by an embodiment of the present application Figure 3 . This embodiment is based on the Figure 1 embodiment and elaborates in detail on the calculation method for the view factor of a target point in a pool fire. As Figure 4 shown, the calculation method for the view factor of a target point in a pool fire provided by this embodiment includes:

[0140] S401. Determine the flame tendency according to the pool fire inclination angle.

[0141] Among them, according to the pool fire inclination angle, judge the main tendency of the flame, that is, the direction in which the flame is tilted by external forces such as wind. Clarifying the flame tendency helps predict the possible diffusion path and affected area of the flame, which is crucial for fire prevention and emergency response.

[0142] S402. When it is determined that the direction of the flame tendency is the upwind direction, determine the upwind reference point of the target point according to the dimensionless radius value.

[0143] S403. When it is determined that the direction of the flame tendency is the downwind direction, determine the downwind reference point of the target point according to the dimensionless radius value.

[0144] Among them, when it is determined that the direction of the flame tendency is the upwind direction and the direction of the flame tendency is the downwind direction, determine the upwind reference point and downwind reference point of the target point according to the dimensionless radius value and the pool fire inclination angle.

[0145] S404. According to the upwind reference point or downwind reference point, determine the direction perpendicular to the upwind reference point or downwind reference point as the sidewind direction, and determine the sidewind reference point of the target point according to the dimensionless radius value.

[0146] Among them, according to the upwind reference point or downwind reference point, determine the direction perpendicular to these reference points as the sidewind direction, and determine the sidewind reference point of the target point according to the dimensionless radius value and the pool fire inclination angle.

[0147] The determination of the upwind reference point, downwind reference point, and crosswind reference point 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.

[0148] S405. Determine the 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.

[0149] Among them, calculate the 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. The dimensionless height value provides a standardized measure of the flame height, which helps in comparison and analysis in fires of different scales.

[0150] S406. According to the dimensionless height value and the pool fire inclination angle, use the inclined cylinder pool fire model to calculate the view factors of the upwind reference point and the downwind reference point, and use the regular cylinder pool fire model to calculate the view factor of the crosswind reference point.

[0151] Among them, combine the dimensionless height value and the pool fire inclination angle, use the inclined cylinder pool fire model to calculate the view factors of the upwind reference point and the downwind reference point, and use the regular cylinder pool fire model to calculate the view factor of the crosswind reference point. The view factors of multiple reference points provide a basis for evaluating the view factor of the target point, and the view factor of the target point provides a quantitative index for the heat radiation intensity received by the target point, which helps to formulate more effective fire response measures.

[0152] This embodiment proposes a calculation method for the view factor of the pool fire target point. This method determines the flame tendency and its opposite direction, locates the upwind and downwind reference points based on the dimensionless radius value, then determines the crosswind reference point, and calculates the view factor through the dimensionless height value and the inclination angle, thereby simplifying the calculation process and improving the calculation efficiency of the view factor of the target point.

[0153] Figure 5 It is a schematic structural diagram of a calculation device for the view factor of the pool fire target point provided by this application. As Figure 5 shown, the calculation device 500 for the view factor of the pool fire target point provided by this embodiment includes:

[0154] A determination module 501, configured to determine the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range, where the key parameters include: the pool fire center, the pool fire inclination angle, the pool fire height, and the pool fire radius;

[0155] The determination module 501 is further configured to determine the pool fire image of the target point according to the key parameters, where the pool fire image of the target point is used to indicate the association relationship between the target point, multiple key reference points, and the pool fire;

[0156] The determining module 501 is further configured to determine the view factors of the multiple key reference points;

[0157] The calculating module 502 is configured to calculate the target view factor of the target point based on the multiple view factors and the target point pool fire image, where the view factor is used to indicate the correlation between the corresponding position point and the heat radiation intensity.

[0158] Optionally, the determining module 501 is further configured to determine the relative distance between the target point and the center of the pool fire;

[0159] The determining module 501 is further configured 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;

[0160] The determining module 501 is further configured to determine the target point pool fire image according to the dimensionless radius value and the center of the pool fire.

[0161] Optionally, the calculating device for the view factor of the pool fire target point further includes: a processing module 503;

[0162] The processing module 503 is configured to draw a corresponding circular image with the position of the center of the pool fire as the center and the dimensionless radius value as the radius;

[0163] The determining module 501 is further configured to 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;

[0164] The determining module 501 is further configured to determine multiple key reference points of the target point according to the pool fire inclination angle, 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;

[0165] The processing module 503 is configured 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.

[0166] Optionally, the determining module 501 is further configured to determine the flame tendency according to the pool fire inclination angle;

[0167] When the determining module 501 determines that the direction of the flame tendency is the upwind direction, it is further configured to determine the upwind reference point of the target point according to the dimensionless radius value;

[0168] The determining module 501 is further configured to, when determining that the direction of the flame tendency is the downwind direction, determine a downwind reference point of the target point according to the dimensionless radius value;

[0169] The determining module 501 is further configured to determine, according to the upwind reference point or the downwind reference point, that the direction perpendicular to the upwind reference point or the downwind reference point is the sidewind direction;

[0170] The determining module 501 is further configured to determine a sidewind reference point of the target point according to the dimensionless radius value.

[0171] Optionally, the determining module 501 is further configured 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;

[0172] The calculating module 502 is further configured to calculate a view factor of the upwind reference point and the downwind reference point by using an inclined cylinder pool fire model according to the dimensionless height value and the pool fire inclination angle, and calculate a view factor of the sidewind reference point by using a regular cylinder pool fire model.

[0173] Optionally, the determining module 501 is further configured to determine the position of the target point in the pool fire image of the target point;

[0174] The calculating module 502 is further configured to, if the target point is located between the sidewind reference point and the downwind reference point, calculate a target view factor of the target point according to the angle between the target point and the downwind reference point and the view factors of the sidewind reference point and the downwind reference point.

[0175] The calculating module 502 is further configured to, if the target point is located between the sidewind reference point and the upwind reference point, calculate a target view factor of the target point according to the angle between the target point and the downwind reference point and the view factors of the sidewind reference point and the upwind reference point.

[0176] Optionally, when the target point is located between the sidewind reference point and the downwind reference point, the calculating module 502 is further configured to calculate the target point view factor by using the following formula:

[0177]

[0178] Wherein, is the target point view factor, is the downwind reference point view factor, is the sidewind reference point view factor, is the angle between the target point and the downwind reference point;

[0179] The calculation module 502 is further configured to calculate the view factor of the target point by using the following formula when the target point is located between the side-wind reference point and the up-wind reference point:

[0180]

[0181] Wherein, is the view factor of the target point, is the view factor of the side-wind reference point, is the view factor of the up-wind reference point, is the included angle between the target point and the down-wind reference point.

[0182] Figure 6 FIG. is a schematic structural diagram of a calculation device for the view factor of a pool fire target point provided by the present application. As Figure 6 shown, the present application provides a calculation device for the view factor of a pool fire target point. The calculation device 600 for the view factor of the pool fire target point includes: a receiver 601, a transmitter 602, a processor 603, and a memory 604.

[0183] The receiver 601 is configured to receive instructions and data;

[0184] The transmitter 602 is configured to send instructions and data;

[0185] The memory 604 is configured to store computer-executable instructions;

[0186] The processor 603 is configured to execute the computer-executable instructions stored in the memory 604 to implement each step performed by the calculation method of the view factor of the pool fire target point in the above embodiments. Specifically, reference may be made to the relevant descriptions in the embodiments of the calculation method of the view factor of the pool fire target point described above.

[0187] Optionally, the above-mentioned memory 604 may be either independent or integrated with the processor 603.

[0188] When the memory 604 is independently provided, the electronic device further includes a bus for connecting the memory 604 and the processor 603.

[0189] The present application further provides a computer storage medium. The computer storage medium stores computer-executable instructions. When the processor executes the computer-executable instructions, the calculation method of the view factor of the pool fire target point performed by the calculation device of the pool fire target point as described above is implemented.

[0190] Those of ordinary skill in the art will understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, and their appropriate combinations. In the hardware implementation, the division between the functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be executed by several physical components in cooperation. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill 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 includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, tape, 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 of ordinary skill in the art that a communication medium typically contains computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0191] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. The present application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only illustrative, and the true scope and spirit of the present application are pointed out by the following claims.

[0192] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A calculation method for the view factor of a pool fire target point, characterized in that, The method includes: Determining key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range, where the key parameters include: the pool fire center, the pool fire inclination angle, the pool fire height, and the pool fire radius; Determining the relative distance between the target point and the pool fire center; determining the dimensionless radius value of the target point relative to the pool fire radius according to the relative distance and the pool fire radius; determining the target point pool fire image according to the dimensionless radius value and the pool fire center; the target point pool fire image is an image that simulates the flame shape, size, and distribution and indicates the association relationship between the target point, multiple key reference points, and the pool fire; the multiple key reference points include: the upwind reference point, the downwind reference point, and the crosswind reference point; Determining the view factors of the multiple key reference points; the view factors of the multiple key reference points include: the view factor of the upwind reference point, the view factor of the downwind reference point, and the view factor of the crosswind reference point, and the view factor is used to indicate the association relationship between the corresponding position point and the heat radiation intensity; Determining 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, calculating the target view factor of the target point according to the angle between the target point and the downwind reference point and the view 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, calculating the target view factor of the target point according to the angle between the target point and the downwind reference point and the view factors of the crosswind reference point and the upwind reference point.

2. The method according to claim 1, characterized in that, The determining the target point pool fire image according to the dimensionless radius value and the pool fire center includes: Taking the position of the pool fire center as the center of a circle and taking the dimensionless radius value as the radius to draw a corresponding circular image; 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; Determining multiple key reference points of the target point according to the pool fire inclination angle, and determining 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; 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 the target point pool fire image.

3. The method according to claim 2, wherein The determining multiple key reference points of the target point according to the pool fire inclination angle includes: Determining the flame tendency according to the pool fire inclination angle; When determining that the direction of the flame tendency is the upwind direction, determining the upwind reference point of the target point according to the dimensionless radius value; When determining that the direction of the flame tendency is the downwind direction, determining the downwind reference point of the target point according to the dimensionless radius value; Determining the direction perpendicular to the upwind reference point or the downwind reference point as the crosswind direction according to the upwind reference point or the downwind reference point; Determine the crosswind reference point of the target point according to the dimensionless radius value.

4. The method according to claim 3, characterized in that The determining the view factors of the multiple key reference points includes: Determine the 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, use the inclined cylindrical pool fire model to calculate the view factors of the upwind reference point and the downwind reference point, and use the regular cylindrical pool fire model to calculate the view factors of the crosswind reference point.

5. The method according to claim 1, characterized in that, The calculating the target view factor of the target point includes: When the target point is located between the crosswind reference point and the downwind reference point, use the following formula to calculate the target point view factor: Among them, is the view factor of the target point, is the view factor of the downwind reference point, is the view factor of the crosswind reference point, is the included 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, use the following formula to calculate the target point view factor: Among them, is the perspective factor of the target point, is the perspective factor of the side-wind reference point, is the perspective factor of the up-wind reference point, is the included angle between the target point and the down-wind reference point.

6. A calculation device for the view factor of a pool fire target point, characterized in that, The device includes: A determination module, configured to determine the key parameters of the pool fire according to the environmental parameters corresponding to the pool fire range, where the key parameters include: the pool fire center, the pool fire inclination angle, the pool fire height, and the pool fire radius; The determination module is further configured to determine the relative distance between the target point and the pool fire center; 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; determine the target point pool fire image according to the dimensionless radius value and the pool fire center; the target point pool fire image is an image that simulates the flame shape, size and distribution and indicates the association relationship between the target point, multiple key reference points and the pool fire; the multiple key reference points include: the upwind reference point, the downwind reference point, and the crosswind reference point; The determination module is further configured to determine the view factors of the multiple key reference points; the visual factors of the multiple key reference points include: the visual factor of the upwind reference point, the view factor of the downwind reference point, and the view factor of the crosswind reference point, and the view factor is used to indicate the association relationship between the corresponding position point and the heat radiation intensity; A calculation module, configured to 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, calculate the target view factor of the target point according to the angle between the target point and the downwind reference point and the view 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, calculate the target view factor of the target point according to the angle between the target point and the downwind reference point and the view factors of the crosswind reference point and the upwind reference point.

7. A calculation device for the view factor of a pool fire target point, characterized in that, Includes: A memory; A processor; Wherein, the memory stores computer execution instructions; The processor executes the computer execution instructions stored in the memory to implement the calculation method of the pool fire target point view factor according to any one of claims 1-5.

8. A computer storage medium, characterized in that, The computer storage medium stores computer execution instructions, and when the computer execution instructions are executed by the processor, they are used to implement the calculation method of the pool fire target point view factor according to any one of claims 1-5.

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