A multi-level combined protection and warning method for an oil depot

Abstract

The present invention provides a multi-level combined protection and warning method for an oil depot. By setting the parameters of three protection layers, the warning boundaries of each protection layer are calculated. When the warning boundaries of different protection layers are triggered, the oil in the oil depot flows. By calculating the warning boundary of the oil explosion in the oil depot when an external object collides or explodes, the movement of the oil in the oil depot can be predicted in advance to prevent the oil explosion in the oil depot.

Description

Technical Field

[0001] The present invention relates to an alarm method, in particular to a multi-level combined protection and alarm method for an oil depot. Background Art

[0002] Oil depots are often used to store oil. When the volume concentration of the oil in the oil depot is within the explosion limit range and it is subjected to collisions or foreign object penetration, etc., explosions are extremely likely to occur. At present, the oil storage structure generally adopts two structures, above-ground or underground. Although the underground oil storage structure is safer, its cost is too high, and the maintenance cost of the oil depot is higher. Therefore, in most areas, the above-ground oil storage structure is generally selected. The above-ground oil depot is easily penetrated by foreign objects and then explodes. How to ensure that the volume concentration of the oil in the oil depot is within a safe range is one of the means to solve the explosion of the oil depot caused by foreign object collisions. Patents such as application numbers 201410138926.7, 201811391762.3, and 202122836723.3 have disclosed some alarm means for oil depots, but these means can only monitor the internal parameters of the oil depot and cannot judge the impact of foreign objects on the oil depot. When foreign objects damage the oil depot, corresponding judgments cannot be made to avoid the explosion of the oil depot. Summary of the Invention

[0003] The purpose of the present invention is to calculate the alarm boundary of the oil explosion in the oil depot when it is collided or exploded by foreign objects. The solution to achieve the above purpose is: a multi-level combined protection and alarm method for an oil depot, including building a multi-level combined protection oil depot: including an oil depot outer shell, an oil depot inner shell, and a spare compartment. The oil depot inner shell is arranged inside the oil depot outer shell. A self-sealing layer is arranged on the outer wall of the oil depot inner shell. The self-sealing layer includes a liquid rubber layer and a barrier layer. Liquid is arranged between the oil depot outer shell and the oil depot inner shell. The spare compartment is arranged inside the oil depot inner shell. The oil depot inner shell is divided into several sub-oil depots by compartment partitions. The circle of sub-oil depots close to the inner wall of the oil depot inner shell is the auxiliary compartment. The sub-oil depots surrounding the spare compartment and surrounded by the auxiliary compartment are the working compartments. The working compartments are connected to the bottom of the spare compartment. The working compartments are not connected to each other. The auxiliary compartments are not connected to each other. Oil outlets are arranged on the bottom surfaces of the working compartments and the spare compartment. The auxiliary compartment is connected to the bottom of its adjacent working compartment. The oil flows unidirectionally from the auxiliary compartment to the working compartment and unidirectionally from the working compartment to the spare compartment. In the initial state, the working compartments and the auxiliary compartments are full of oil and the spare compartment is in a vacant state; setting three levels of protection layers: the first-level protection layer composed of the oil depot outer shell, the self-sealing layer as the second-level protection layer, and the compartment partition as the third-level protection layer; obtaining the parameters required for the alarm boundary of each level of protection layer: obtaining the parameters that can calculate the alarm boundary of each level of protection layer through simulation; obtaining the alarm boundary of each level of protection layer: calculating the relationship between the speed and kinetic energy of foreign objects when each level of protection layer is penetrated according to the parameters, and this relationship is used as the alarm boundary of the protection layer; setting the damaged state of the protection layer: {S 1 = penetration, S2 = Contact explosion}; In different damage states of the protective layers, if the warning boundary is triggered, corresponding alarm information is sent, and the oil body flows between the auxiliary compartment, the working compartment, and the standby compartment.

[0004] Furthermore, the parameters for obtaining the warning boundary of each level of the protective layer include: The parameters required for calculating the warning boundary of the first-level protective layer include the strength σ of the oil depot shell 1 , thickness d 1 , the initial mass m of the foreign object 1 , the initial charge W 1 , cross-sectional area A; The parameters required for calculating the warning boundary of the second-level protective layer include the dynamic viscosity μ and density ρ' of the liquid rubber, the strength σ of the barrier layer 2 , thickness d 2 , and the remaining mass m of the foreign object 2 , cross-sectional area A, diameter d b ; The parameters required for calculating the warning boundary of the third-level protective layer include the strength σ of the compartment partition 6 , thickness d 6 , and the remaining mass m of the foreign object 3 , charge W 3 , cross-sectional area A.

[0005] Furthermore, after each level of warning boundary is triggered, the oil depot will take relevant actions: (1) When the warning boundary of the first-level protective layer is triggered, the liquid sprays at the perforation caused by the foreign object; when the warning boundary of the second-level protective layer is triggered, the oil body flows from the auxiliary compartment to the working compartment; when the warning boundary of the third-level protective layer is triggered, the oil body flows from the working compartment to the standby compartment.

[0006] Furthermore, the method for obtaining the warning boundary of the second-level protective layer is:

[0007] According to the remaining velocity v” of the foreign object after being affected by the liquid 1 , the dynamic viscosity μ, density ρ', drag coefficient C d ' of the liquid rubber, and the remaining mass m of the foreign object 2 , cross-sectional area A, diameter d b Obtain the remaining velocity v of the foreign object after penetrating the liquid rubber 2 and the remaining kinetic energy E 2 ;

[0008]

[0009] Among them, v” 1 is the velocity of the foreign object changing with time t in the liquid, m 2 is the remaining mass of the foreign object after penetrating the oil depot shell 1; According to the remaining velocity v 2 and the remaining kinetic energy E 2, and the strength σ of the barrier layer 2 , thickness d 2 Fitting to obtain the speed v' of the foreign object penetrating the barrier layer 2 and kinetic energy E' 2 , speed v' 2 and kinetic energy E' 2 The relationship between them is the warning boundary of the secondary protection layer.

[0010] Furthermore, the speed v'' of the foreign object changing with time t in the liquid 1 and the remaining mass m of the foreign object after penetrating the oil depot shell 1 2 The acquisition method is

[0011]

[0012]

[0013] where ρ is the density of the liquid, u is the jet velocity of the liquid, is the mass flow rate of the liquid jet, C d is the liquid resistance coefficient, k' is the empirical coefficient, E m is the energy absorption capacity per unit mass of the foreign object material; v' 1 is the remaining speed of the foreign object after penetrating the oil depot shell 1. After the foreign object passes through the oil depot shell, according to the law of conservation of energy, the remaining kinetic energy E' 1 and the corresponding remaining speed v' 1

[0014]

[0015] F 1 is the average resistance of the oil depot shell 1 to the foreign object, k is the comprehensive proportionality coefficient, σ 1 is the strength of the oil depot shell.

[0016] Furthermore, the charge W of the foreign object after penetrating the barrier layer 3 and mass m 3 are obtained by the following formula

[0017]

[0018] where W 2 is the remaining charge of the foreign object after penetrating the oil depot shell, k' is the empirical coefficient, E b is the energy of explosion per unit mass of the foreign object charge.

[0019] Furthermore, if the damage state of the protection layer is S 1= During penetration, determine whether the kinetic energy and velocity of the external object trigger the warning boundaries of each protective layer. If triggered, the oil will flow between the auxiliary compartment, the working compartment, and the standby compartment; if the damage state of the protective layer is S 2 = For contact explosion, calculate the damage degree of the explosion to the oil depot. If the oil depot is not damaged, determine whether the initial velocity and kinetic energy of the explosion fragments trigger the warning boundaries of each protective layer. If triggered, the oil will flow between the auxiliary compartment, the working compartment, and the standby compartment.

[0020] Compared with the prior art, the present invention has the following advantages: (1) Three levels of protective layer warning boundaries are set. For different protective layers being triggered, different countermeasures are taken for the oil in the oil depot to flow, so that the volume concentration of the oil in different compartments can always be kept outside the explosion limit range, preventing the oil depot from exploding; (2) The two states of penetration and contact explosion are comprehensively considered, warning boundaries in different situations are established, and different alarms can be made after pre-judging the type of the external object.

[0021] The present invention will be further described below with reference to the accompanying drawings of the specification. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of a multi-stage combined protection oil depot related to the present invention.

[0023] Among them, the oil depot outer shell 1, the oil depot inner shell 2, the liquid 3, the standby compartment 4, the self-sealing layer 5, and the compartment partition 6. Detailed Embodiment

[0024] Combined with Figure 1 , a multi-stage combined protection oil depot includes an oil depot outer shell 1, an oil depot inner shell 2, a liquid 3, a standby compartment 4, a self-sealing layer 5, and a compartment partition 6. The oil depot inner shell 2 is arranged inside the oil depot outer shell 1, and the liquid 3 is arranged in the gap between the oil depot outer shell 1 and the oil depot inner shell 2; the standby compartment 4 is arranged inside the oil depot inner shell 2, an oil outlet is arranged at the bottom surface of the standby compartment 4, and the self-sealing layer 5 is wrapped on the outer wall of the oil depot inner shell 2. The compartment partition 6 vertically divides the space of the oil depot inner shell 2 into several sub-oil depots. The circle of sub-oil depots close to the inner wall of the oil depot inner shell 2 is the auxiliary compartment, the sub-oil depot surrounded by the auxiliary compartment is the working compartment, and the working compartment is arranged around the standby compartment 4; the internal volume of the working compartment is larger than the internal volume of the auxiliary compartment.

[0025] The working compartments are not connected to each other, and an oil outlet is arranged on the bottom surface of each working compartment. An oil passing hole and a pumping machine are arranged at the lower end of the side wall of the standby compartment 4, and the oil in the working compartment flows into the standby compartment 4 through the pumping machine. The auxiliary compartments are not connected to each other, and an oil passing hole and a pumping machine are arranged at the lower end of the compartment partition 4 between the auxiliary compartment and its adjacent working compartment, and the oil can only flow from the auxiliary compartment to the working compartment.

[0026] Combustible substances have explosion limits. For example, the explosion limit range of gasoline is 1.0% - 6.0% volume concentration. Therefore, when the volume concentration of the oil in the oil depot reaches the explosion limit and the mixture of the oil and air encounters a fire source after being broken through by an external object, an explosion will occur. The multi-level combined protection described in this embodiment includes the outer shell 1 of the oil depot and the liquid 3 as the first-level protection, the self-sealing layer 5 on the outer wall of the inner shell 2 of the oil depot as the second-level protection, and the compartment partition 6 inside the inner shell 2 of the oil depot as the third-level protection.

[0027] In this embodiment, the internal space of the inner shell 2 of the oil depot is divided into 16 parts by the compartment partition 6. Among them, the 4 middle compartments are working compartments, and the 12 surrounding compartments are auxiliary compartments. The working compartments are filled with explosion-proof and isolation materials. In the initial state, the working compartments and the auxiliary compartments are full of oil, and the spare compartment 4 is in a vacant state. Since the fuel in the working compartments is used relatively frequently, in most cases, the concentration of the oil-gas mixture in the compartments is within the combustion and explosion range. The auxiliary oil compartments are basically full of oil. At this time, the concentration of the oil-gas mixture in the compartments is outside the combustion and explosion range, and the property is stable, and no combustion and explosion phenomenon will occur. An oil passing hole is provided below the partition connecting the working compartments and the auxiliary compartments, and a switchable explosion-proof partition is provided at the hole, which is generally in a closed state. When the fuel in the working compartment is exhausted, the oil passing hole is opened, and the oil in the auxiliary compartment is pumped out through the oil pump in the working compartment for use in the working compartment. Since the volume of a single working compartment is larger than that of a single auxiliary compartment, when all the oil in the auxiliary compartment is pumped out, the concentration of the oil-gas mixture in the compartment is still outside the combustion and explosion range, so no combustion and explosion phenomenon will occur.

[0028] The liquid 3 can be selected from water or shear thickening liquid (STP). When an external object breaks through the outer shell 1 of the oil depot, the perforation is small, resulting in the explosion energy being concentrated on a small area, forming a shaped charge jet. At this time, the liquid 3 sprays from the perforation, and the fine particles of the liquid 3 impact on the jet to exert a force interference, which affects the stability of the jet to a certain extent. In addition, when the jet propagates in the liquid, the pressure pulse generated can form a reflected pulse through the inner and outer shells of the oil depot to interfere with the stability of the jet.

[0029] The self-sealing layer 5 is wrapped on the outer side wall of the inner shell 2 of the oil depot. When an external object breaks through the inner shell of the oil depot, the self-sealing layer 5 can shrink and rebound, reducing the perforation area. At the same time, a small amount of the fuel inside the oil depot leaks, which can play a role in filling the perforation to a certain extent, so as to achieve the self-sealing effect of the perforation. The structure of the self-sealing layer 5 from the outside to the inside is successively a protective skeleton layer, a liquid rubber layer, and a barrier layer.

[0030] To achieve the purpose of multi-level combined protection, this embodiment also provides a multi-level combined protection warning method for an oil depot, including the following steps:

[0031] (1) Set the protection priority: The outer shell 1 of the oil depot and the liquid 3 are the first-level protection, the self-sealing layer 5 on the outer wall of the inner shell 2 of the oil depot is the second-level protection, and the compartment partition 6 inside the inner shell 2 of the oil depot is the third-level protection;

[0032] (2) Set the damaged state of the protective layer {S 1 = penetration, S 2 = contact explosion};

[0033] (3) Obtain the warning boundaries of each priority protection layer under different damaged states.

[0034] The relevant parameters required to judge the warning boundaries of each protection priority include:

[0035] (1) The first-level protection layer includes the strength σ of the outer shell 1 of the oil depot 1 , thickness d 1 , the initial mass m of the foreign object 1 , initial charge W 1 , cross-sectional area A, and the density ρ, jet velocity u, jet mass flow rate of the liquid 3 drag coefficient C d ;

[0036] (2) The second-level protection layer includes the dynamic viscosity μ and density ρ' of the liquid rubber, the strength σ of the barrier layer 2 , thickness d 2 , and the remaining mass m of the foreign object 2 , cross-sectional area A, diameter d b ;

[0037] (3) The third-level protection layer includes the strength σ of the compartment partition 6 6 , thickness d 6 , and the remaining mass m of the foreign object 3 , charge W 3 , cross-sectional area A;

[0038] In practical applications, when the process of foreign object penetration is short and actions cannot be taken in time, it is necessary to predict and simulate the possible protection limit that may be broken through and take corresponding actions in advance. After each warning boundary is triggered, the oil depot will take relevant actions, and the relevant actions are as follows:

[0039] (1) When the warning boundary of the first-level protection layer is triggered, the liquid 3 sprays at the perforation caused by the foreign object;

[0040] (2) When the warning boundary of the second-level protection layer is triggered, the oil flows from the auxiliary compartment to the working compartment;

[0041] (3) When the warning boundary of the third-level protection layer is triggered, the oil flows from the working compartment to the standby compartment.

[0042] Specifically, when the warning boundary of the first-level protective layer is triggered, the liquid 3 sprays outwards from the gap caused by the foreign object. During the spraying process, the liquid 3 will generate a jet flow that affects the movement of the foreign object. If the warning boundary of the second-level protective layer is not triggered, the oil in the auxiliary compartment does not flow; if the warning boundary of the second-level protective layer is triggered, it indicates that the auxiliary compartment may be damaged. To prevent the foreign object from entering the auxiliary compartment and causing an explosion, it is necessary to calculate whether the remaining volume concentration of the oil in the auxiliary compartment is within the explosion limit range. If it is within the explosion limit range, the oil flows from the auxiliary compartment to the working compartment through the oil pump. If the warning boundary of the third-level protective layer is not triggered, the oil in the working compartment does not flow; if the warning boundary of the third-level protective layer is triggered, to prevent the foreign object from entering the working compartment, it is necessary to calculate whether the remaining volume concentration of the oil in the working compartment is within the explosion limit range. If it is within the explosion limit range, the oil in the working compartment flows to the spare compartment 4 through the oil pump.

[0043] This method can pre-judge parameters such as the type of the foreign object, obtain the relevant parameters of the speed, kinetic energy, and explosion of the foreign object through the data stored in the database, and judge whether the parameter can trigger the warning boundary of each protective layer. If the warning boundary cannot be triggered, the oil in the oil depot does not flow; if the warning boundary can be triggered, the oil in the oil depot flows according to the corresponding actions that can trigger the warning boundary.

[0044] Embodiment 1

[0045] In this embodiment, it is assumed that the damage state of the protective layer is S 1 when calculating the warning boundary of each priority protective layer.

[0046] 1. Calculation method for the warning boundary of the first-level protective layer

[0047] Step S101, obtain the strength σ 1 and thickness d 1 of the oil depot outer shell 1, and fit to obtain the kinetic energy E 1 and speed v1 when the foreign object starts to penetrate the oil depot outer shell 1 through the initial mass m 1 of the foreign object, the initial charge W 1 ;

[0048] Step S102, compare with the preset penetration kinetic energy threshold E 1th of the oil depot outer shell 1. If E 1 > E 1th , the oil depot outer shell 1 can be penetrated and broken through, and thus the warning boundary of the first-level protective layer is established.

[0049] In step S101, based on the initial mass m 1 of the foreign object and the initial charge W 1, the cross-sectional area A obtains the speed of the external object, that is, according to the strength σ of the oil depot shell 1 1 , the thickness d 1 Obtain the kinetic energy E of the external object penetrating the oil depot shell 1 1 and the speed v 1 , obtain the linear relationship between the kinetic energy and the speed and the mass m 1 , the charge amount W 1 , the cross-sectional area A

[0050]

[0051] Obtain the curves of the speed and the kinetic energy through formula (1), and compare them with the preset penetration kinetic energy threshold E of the oil depot shell 1 1th If E 1 > E 1th , then the oil depot shell 1 can be penetrated and broken through, and thus the warning boundary of the first-level protection layer is established.

[0052] After the external object passes through the oil depot shell 1, estimate the remaining kinetic energy E' according to the law of conservation of energy 1 and the corresponding second speed v' 1

[0053]

[0054] Among them, F 1 is the average resistance of the oil depot shell 1 to the external object, k is the comprehensive proportionality coefficient, σ 1 is the strength of the oil depot shell (1); the average resistance F of the oil depot shell 1 to the external object 1 can be estimated through experimental data.

[0055] After the external object penetrates the oil depot shell 1, due to the interception of the oil depot shell 1 and the influence of the liquid jet, the kinetic energy will decrease. Assume that the jet formed by the liquid 3 acts symmetrically on the external object, and establish the objective function of the influence of the liquid 3 jet on the external object when the external object penetrates into the liquid 3

[0056]

[0057] Among them, v” 1 is the speed of the external object changing with time t in the liquid 3, C d is the resistance coefficient, ρ is the liquid density, u is the liquid 3 jet speed, is the liquid 3 jet mass flow rate, m 2 is the remaining mass of the external object after penetrating the oil depot shell 1. The time t, the jet speed u and the jet mass flow rate It can be estimated through test data. Since the mass and charge of the foreign object are lost in the process of penetrating the oil depot shell 1, the remaining mass m of the foreign object after penetrating the oil depot shell 1 is 2 and the remaining charge W 2 It is estimated from formula (4) that

[0058]

[0059] Where k' is an empirical coefficient, usually taking the value [0.1, 0.5]; E m is the energy absorption capacity per unit mass of the foreign material, E b The explosive energy per unit mass of the foreign charge, such as E for a copper bullet m =1×10 6 Joule / kg, the unit mass explosion energy E of the internal charge b =2.5×10 6 Joule / kg.

[0060] 2. Calculation method of the second level protection layer warning boundary

[0061] The second level of protection is a self-sealing layer, which includes a liquid rubber layer and a barrier layer. Their interception effects on foreign objects are different. The liquid rubber layer can shrink and rebound to reduce the perforation area caused by foreign objects; the barrier layer mainly blocks foreign objects through the thickness and strength of the material.

[0062] The velocity v of the liquid rubber layer after blocking the external object 2 and the remaining kinetic energy E 2 Calculated by formula (5)

[0063]

[0064] Where, μ is the dynamic viscosity of the liquid rubber, ρ' is the density of the liquid rubber, C d ' is the resistance coefficient of liquid rubber, d b is the external object diameter.

[0065] Assuming that there is no mass loss when the foreign object penetrates the liquid rubber layer, the speed v' of the foreign object penetrating the barrier layer is 2 and kinetic energy E' 2 Calculated by formula (6)

[0066]

[0067] Among them, d 2 is the barrier layer thickness, F 2 is the average resistance of the barrier layer to external objects, σ 2 is the strength of the barrier layer. At this time, the speed v' 2and kinetic energy E' 2 The relationship with is the warning boundary of the secondary protection layer. Compared with the preset penetration kinetic energy threshold E of the barrier layer 2th For comparison, if E' 2 > E 2th , then the barrier layer can be penetrated and breached.

[0068] 3. Calculation method for the warning boundary of the tertiary protection layer

[0069] The method for obtaining the warning boundary of the tertiary protection layer is similar to the method for obtaining the warning boundary of the first protection layer when the damage state of the protection layer is S 1 The remaining mass m of the foreign object after passing through the barrier layer, the charge weight W 3 , the cross-sectional area A, and the strength σ 3 of the cabin partition 6, as well as the thickness d 6 are used to fit and obtain the kinetic energy E 6 and velocity v 3 associated curve for triggering the warning boundary of the tertiary protection layer, that is 3 When the foreign object approaches the tertiary protection layer, due to the interception by the barrier layer of the secondary protection layer, its mass and charge weight will both be lost. At this time, the foreign object mass m

[0070]

[0071] and the charge weight W 3 are obtained through Equation (8) 3 Example 2

[0072]

[0073] In this example, it is assumed that when the damage state of the protection layer is S

[0074] , a contact explosion occurs outside the oil depot. The explosion detonation wave and fragments generated will affect the oil depot. First, calculate the damage degree of the explosion to the oil depot. If the oil depot is not damaged, then calculate the impact of the explosion fragments on the oil depot. The method for whether the fragments, as foreign objects, trigger the warning boundaries of each protection layer is the same as in Example 1, except that the initial velocity v' 2 and kinetic energy E b ' need to be obtained according to the projectile mass M, charge type, and charge weight W, as specifically shown in Equation (9) b where

[0075]

[0076] is the Gurney constant, which is related to the charge type and has the unit of meters per second. The fragments can be evenly divided into N parts according to the foreign object mass. Replace v' with v b ​1 The warning boundaries of each protection layer are calculated.

[0077] Since the movement trajectories of the fragments after the explosion spread outwards with the explosion center point as the center of the sphere, there may be multiple fragments acting on the oil depot simultaneously. The liquid 3 in the oil depot generates multiple jets due to multiple fragments at the same moment. Different jets may cause asymmetric impact forces on external objects, thereby comprehensively affecting the movement state of the fragments. Therefore, it is necessary to decompose the impact forces of each jet in the x and y directions and perform vector summation on the total impact force affecting each fragment. Specifically,

[0078] Obtain the impact force F of the jet corresponding to the fragment i = F i,d + F i,m , where F d is the resistance of the liquid jet to the bullet, and F m is the momentum exchange force of the liquid jet on the bullet

[0079]

[0080] Decompose the impact force of the jet into components in the x and y directions where are the unit directions in the x and y directions of the i-th jet respectively,

[0081] Obtain the impact force of each jet other than the jet corresponding to the fragment where ρ is the liquid density, and A l is the cross-sectional area of the l-th fragment. Assuming the cross-sectional areas of the fragments are equal, u l is the velocity of the l-th jet in the liquid 3, is the unit direction of the l-th jet direction, and the unit direction is related to the angle between the jet and the x-axis;

[0082] Decompose the impact force of each jet into components in the x and y axis directions

[0083]

[0084] where, θ i is the angle between the l-th jet and the x-axis (horizontal direction);

[0085] Obtain the x and y components of the total impact force where n is the number of jets;

[0086] The magnitude of the total impact force is

[0087] The direction of the jet can be obtained based on the shape and energy release mode of the simulated explosive, as well as the distance from the explosion to the oil depot.

Claims

1. A multi-level joint protection alarm method for an oil depot, characterized in that: include: A multi-level joint protection oil depot is constructed: comprising an oil depot outer shell (1), an oil depot inner shell (2), and a spare cabin (4); the oil depot inner shell (2) is arranged inside the oil depot outer shell (1); a self-sealing layer (5) is arranged on the outer wall of the oil depot inner shell (2); the self-sealing layer (5) comprises a liquid rubber layer and a barrier layer; a liquid (3) is arranged between the oil depot outer shell (1) and the oil depot inner shell (2); the spare cabin (4) is arranged inside the oil depot inner shell (2); the oil depot inner shell (2) is divided into a plurality of sub-oil depots by a cabin partition (6); a circle of oil depots close to the inner wall of the oil depot inner shell (2) The oil depot is an auxiliary cabin, and the sub-oil depot surrounding the spare cabin (4) and surrounded by the auxiliary cabin is a working cabin. The working cabin is connected to the spare cabin (4) at the bottom, and the working cabins are not connected to each other, and the auxiliary cabins are not connected to each other. The bottom surfaces of the working cabin and the spare cabin (4) are provided with oil outlets. The auxiliary cabin is connected to the bottom of its adjacent working cabin. The oil flows unidirectionally from the auxiliary cabin to the working cabin, and from the working cabin to the spare cabin (4). In the initial state, the working cabin and the auxiliary cabin are full of oil, and the spare cabin (4) is empty. Three levels of protection are provided: the first level of protection is formed by the oil depot shell (1), the second level of protection is formed by the self-sealing layer (5), and the third level of protection is formed by the cabin bulkhead (6); Obtain the parameters required for the alarm boundary of each level of protection layer: obtain the parameters that can calculate the alarm boundary of each level of protection layer through simulation; Obtain the warning boundary of each level of protection layer: Calculate the relationship between the speed and kinetic energy of the foreign object when each level of protection layer is penetrated according to the parameters, and use this relationship as the warning boundary of the protection layer; Set the damage state of the protective layer: {S1 = penetration, S2 = contact explosion}; Under different protective layer damage states, if the alarm boundary is triggered, a corresponding alarm message is issued, and the oil flows between the auxiliary compartment, the working compartment and the spare compartment (4).

2. The method according to claim 1, characterized in that The parameters for obtaining the alarm boundary of each protection layer include: The parameters required for calculating the warning boundary of the first-level protection layer include the strength σ1 and thickness d1 of the oil depot shell (1), the initial mass m1 of the foreign object, the initial charge W1, and the cross-sectional area A; The parameters required for calculating the warning boundary of the second-level protection layer include the dynamic viscosity μ and density ρ' of the liquid rubber, the strength σ2 and thickness d2 of the barrier layer, and the residual mass m2, cross-sectional area A, and diameter d of the foreign object. b ; The parameters required for calculating the warning boundary of the third-level protection layer include the strength σ6 and thickness d6 of the cabin partition (6), as well as the residual mass m3, charge W3, and cross-sectional area A of the foreign object.

3. The method according to claim 1 or 2, characterized in that: After each level of alarm boundary is triggered, the oil depot will take relevant actions: (1) The alarm boundary of the first-level protection layer is triggered, and the liquid (3) sprays at the perforation caused by the foreign object; (2) The second-level protection layer alarm boundary is triggered, and the oil flows from the auxiliary compartment to the working compartment; (3) The third-level protection layer alarm boundary is triggered, and the oil flows from the working compartment to the spare compartment.

4. The method according to claim 3, characterized in that The method for obtaining the second-level protection layer alarm boundary is as follows: According to the residual velocity v"1 of the liquid (3) after the impact of the external object, the dynamic viscosity μ, density ρ', and resistance coefficient C of the liquid rubber d ', and the remaining mass of the foreign object m2, cross-sectional area A, diameter d b Obtain the remaining velocity v2 and remaining kinetic energy E2 of the foreign object after penetrating the liquid rubber; Wherein, v”1 is the velocity of the foreign object in the liquid (3) changing with time t, and m2 is the remaining mass of the foreign object after penetrating the oil depot shell (1); The speed v'2 and kinetic energy E'2 of foreign objects penetrating the barrier layer are obtained by fitting based on the residual speed v2 and the residual kinetic energy E2, as well as the strength σ2 and thickness d2 of the barrier layer. The relationship between the speed v'2 and the kinetic energy E'2 is the warning boundary of the second-level protection layer.

5. The method according to claim 4, characterized in that The velocity v"1 of the foreign object in the liquid (3) changing with time t and the remaining mass m2 of the foreign object after penetrating the oil reservoir shell (1) are obtained by: Where, ρ is the density of liquid (3), u is the jet velocity of liquid (3), is the mass flow rate of the liquid (3) jet, C d is the resistance coefficient of the liquid (3), k' is the empirical coefficient, E m is the energy absorption capacity per unit mass of the material of the foreign object; v'1 is the residual speed of the foreign object after it penetrates the oil depot shell (1). After the foreign object passes through the oil depot shell (1), the residual kinetic energy E'1 and the corresponding residual speed v'1 are obtained according to the law of conservation of energy. F1 is the average resistance of the oil depot shell (1) to external objects, k is the comprehensive proportionality coefficient, and σ1 is the strength of the oil depot shell (1).

6. The method according to claim 5, characterized in that The charge W3 and mass m3 of the foreign object after penetrating the barrier layer are obtained by the following formula: Where W2 is the remaining charge of the foreign object after penetrating the oil depot shell (1), k' is the empirical coefficient, and E b It is the explosion energy per unit mass of foreign charge.

7. According to the method of claim 6, if the damage state of the protective layer is S1 = penetration, it is determined whether the kinetic energy and speed of the foreign object trigger the warning boundaries of each protective layer. If triggered, the oil body flows between the auxiliary compartment, the working compartment and the spare compartment (4); if the damage state of the protective layer is S2 = contact explosion, the degree of damage to the oil depot caused by the explosion is calculated. If the oil depot is not damaged, it is determined whether the initial speed and kinetic energy of the explosion fragments trigger the warning boundaries of each protective layer. If triggered, the oil body flows between the auxiliary compartment, the working compartment and the spare compartment (4).

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