Multi-stage combined protection alarm method for oil depot

Abstract

The invention provides a multistage joint protection alarm method for an oil depot, which comprises the following steps: setting parameters of three protection layers, calculating an alarm boundary of each protection layer, and when the alarm boundaries of different protection layers are triggered, oil in the oil depot flows. By calculating the alarm boundary of the explosion of the oil body in the oil depot when the foreign object collides or explodes, the action of the oil body in the oil depot can be pre-judged, and the explosion of the oil body in the oil depot is prevented.

Description

Technical Field

[0001] The invention relates to an alarm method, in particular to a multi-level joint protection 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, it is very easy to explode when it is hit or penetrated by foreign objects. At present, oil storage structures generally adopt two structures: above-ground or underground. Although underground oil storage structures are safer, their cost is too high and the maintenance cost of oil depots is higher. Therefore, in most areas, above-ground oil storage structures are generally chosen. Above-ground oil depots are easily hit and penetrated by foreign objects, which can cause explosions. 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 oil depots caused by foreign objects. Chinese patents such as application numbers 201410138926.7, 201811391762.3, and 202122836723.3 disclose some alarm means for oil depots, but these means can only monitor the parameters inside the oil depot, but cannot judge the impact of foreign objects on the oil depot. When foreign objects damage the oil depot, it is impossible to make corresponding judgments to avoid explosions in the oil depot. Summary of the invention

[0003] The purpose of the present invention is to calculate the warning boundary of the explosion of oil in the oil depot when a foreign object collides or explodes. The scheme for achieving the above purpose is: a multi-level joint protection alarm method for an oil depot, including building a multi-level joint protection oil depot: including an oil depot outer shell, an oil depot inner shell, and a spare cabin, the oil depot inner shell is arranged in 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 cabin is arranged in the oil depot inner shell, the oil depot inner shell is divided into several sub-oil depots by cabin partitions, a circle of oil depots close to the inner wall of the oil depot inner shell is an auxiliary cabin, the sub-oil depots surrounding the spare cabin and surrounded by the auxiliary cabin are working cabins, the working cabin is connected to the bottom of the spare cabin, the working cabins are not connected, the auxiliary cabins are not connected, the working cabin and the spare cabin bottom are provided with oil outlets, the auxiliary cabin is connected to the bottom of the adjacent working cabin, and the oil body flows from the auxiliary cabin to the working cabin. The oil flows unidirectionally from the working cabin to the spare cabin. In the initial state, the working cabin and the auxiliary cabin are full of oil and the spare cabin is empty. Three-level protection layers are set: the outer shell of the oil depot is the first-level protection layer, the self-sealing layer is the second-level protection layer, and the cabin partition is the third-level protection layer. The parameters required for the alarm boundary of each level of protection layer are obtained: the parameters that can be used to calculate the alarm boundary of each level of protection layer are obtained through simulation; the alarm boundary of each level of protection layer is obtained: the relationship between the speed and kinetic energy of the foreign object when each level of protection layer is penetrated is calculated according to the parameters, and this relationship is used as the alarm boundary of the protection layer; the damage state of the protection layer is set: {S1=penetration, S2=contact explosion}; under different damage states of the protection layer, if the alarm boundary is triggered, the corresponding alarm information is issued, and the oil flows between the auxiliary cabin, the working cabin and the spare cabin.

[0004] Furthermore, the parameters for obtaining the warning boundary of each level of protection layer include: the parameters required for calculating the warning boundary of the first level of protection layer include the strength of the oil depot shell ,thickness d 1. The quality of external objects m , Charge amount W , cross-sectional area A ; The parameters required for calculating the warning boundary of the second level protection layer include the dynamic viscosity of the liquid rubber ,density , the strength of the barrier layer ,thickness , and the residual mass of the external object m 2. Cross-sectional area A ,diameter ; The parameters required for calculating the third level protection layer warning boundary include the strength of the cabin partition ,thickness d 6. And the remaining mass of the external object m 3. Charge quantity W 3. Cross-sectional area A .

[0005] Furthermore, after each level of alarm boundary is triggered, the oil depot will take relevant actions: when the first-level protection layer alarm boundary is triggered, the liquid will spray at the perforation caused by foreign objects; when the second-level protection layer alarm boundary is triggered, the oil will flow from the auxiliary compartment to the working compartment; when the third-level protection layer alarm boundary is triggered, the oil will flow from the working compartment to the spare compartment.

[0006] Furthermore, the method for obtaining the first-level protection layer alarm boundary is: according to the strength of the oil depot shell ,thickness d 1. The quality of external objects m , Charge amount W , cross-sectional area A Fitting to obtain the kinetic energy of foreign objects penetrating the oil depot shell E 1 and speed v 1. Kinetic Energy E 1 and speed v 1 is the first level protection layer alarm boundary , in, k is the comprehensive proportionality coefficient.

[0007] Furthermore, the method for obtaining the second-level protection layer alarm boundary is: According to the residual speed of the liquid after the impact of the external object , Dynamic viscosity of liquid rubber ,density , drag coefficient , and the residual mass of the external object m 2. Cross-sectional area A ,diameter Get the remaining speed of the foreign object after penetrating the liquid rubber v 2 and residual kinetic energy E 2; , in, The amount of foreign matter in a liquid changes with time t The speed of change, m 2 is the remaining mass of the foreign object after penetrating the oil depot shell; according to the residual speed v 2 and residual kinetic energy E 2. And the strength of the barrier layer ,thickness Fitting to obtain the speed of foreign objects penetrating the barrier layer v’ 2 and kinetic energy E’ 2. Speed v’ 2 and kinetic energy E’ The relationship 2 is the alarm boundary of the second-level protection layer.

[0008] Furthermore, the foreign matter in the liquid t The speed of change and the remaining mass of foreign objects after penetrating the tank shell m 2 The method to obtain is , , in, is the density of the liquid, u is the jet velocity of the liquid, is the mass flow rate of the liquid jet, is the liquid resistance coefficient, The remaining speed of the foreign object after it penetrates the oil tank shell. ， F 1 is the average resistance of the oil depot shell to external objects.

[0009] Furthermore, according to the strength of the cabin partition ,thickness d 6. And the remaining mass of the external object m 3. Charge quantity W 3. Cross-sectional area A Fitting to obtain the kinetic energy of penetrating the cabin bulkhead E 3 and speed v 3. Kinetic energy E 3 and speed v 3 is the third level protection layer alarm boundary , in, W 3 is the amount of charge remaining in the foreign object after penetrating the barrier layer, m 3 is the amount of explosive remaining in the foreign object after penetrating the barrier layer.

[0010] Furthermore, the charge of the foreign object after penetrating the barrier layer W 3. Quality m 3 Obtained by the following formula , , in, The remaining charge of the foreign object after penetrating the oil depot shell. k’ is the empirical coefficient, E b It is the explosion energy per unit mass of foreign charge.

[0011] Furthermore, if the damage state of the protective layer is S1 = penetration, determine whether the kinetic energy and speed of the foreign object trigger the alarm boundaries of each protective layer. If triggered, the oil flows between the auxiliary compartment, the working compartment and the spare compartment; if the damage state of the protective layer is S2 = contact explosion, calculate the degree of damage to the oil depot caused by the explosion. If the oil depot is not damaged, determine whether the initial speed and kinetic energy of the explosion fragments trigger the alarm boundaries of each protective layer. If triggered, the oil flows between the auxiliary compartment, the working compartment and the spare compartment.

[0012] Compared with the prior art, the present invention has the following advantages: (1) three priority levels of protection layer alarm boundaries are established. When different protection layers are triggered, different response measures are taken to flow the oil in the oil depot, so that the volume concentration of the oil in different chambers can always be kept outside the explosion limit range to prevent the oil depot from exploding; (2) the two states of penetration and explosion upon contact are comprehensively considered, and alarm boundaries are established under different situations. Different alarms can be issued after pre-judging the type of the foreign object.

[0013] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a schematic diagram of the structure of a multi-stage combined protection oil depot.

[0015] Among them, there are an oil depot outer shell 1, an oil depot inner shell 2, liquid 3, a spare cabin 4, a self-sealing layer 5, and a cabin partition 6. DETAILED DESCRIPTION

[0016] Combination Figure 1 A multi-stage joint protection oil depot includes an oil depot outer shell 1, an oil depot inner shell 2, a liquid 3, a spare cabin 4, a self-sealing layer 5, and a cabin partition 6. The oil depot inner shell 2 is arranged in 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 spare cabin 4 is arranged in the oil depot inner shell 2, and an oil outlet is arranged on the bottom surface of the spare cabin 4, and the self-sealing layer 5 is wrapped on the outer wall of the oil depot inner shell 2. The cabin partition 6 vertically divides the space of the oil depot inner shell 2 into several sub-oil depots, a circle of oil depots close to the inner wall of the oil depot inner shell 2 is an auxiliary cabin, and the sub-oil depot surrounded by the auxiliary cabin is a working cabin, and the working cabin is arranged around the spare cabin 4; the internal volume of the working cabin is larger than the internal volume of the auxiliary cabin.

[0017] The working compartments are not connected, and an oil outlet is provided on the bottom surface of each working compartment. An oil hole and an oil pump are provided 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 oil pump. The auxiliary compartments are not connected, and an oil hole and an oil pump are provided at the lower end of the compartment partition 4 between the auxiliary compartment and the adjacent working compartment, and the oil can only flow from the auxiliary compartment to the working compartment.

[0018] Combustible substances have explosion limits, for example, the explosion limit of gasoline ranges from 1.0% to 6.0% volume concentration. Therefore, when the volume concentration of the oil in the oil depot reaches the explosion limit, the oil and air mix and encounter a fire source after the foreign object breaks through, and then an explosion occurs. The multi-level joint protection described in this embodiment includes the oil depot shell 1 and liquid 3 as the first level of protection, the self-sealing layer 5 on the outer wall of the oil depot inner shell 2 as the second level of protection, and the cabin partition 6 in the oil depot inner shell 2 as the third level of protection.

[0019] In this embodiment, the internal space of the inner shell 2 of the oil depot is divided into 16 parts by the cabin partition 6, of which the middle 4 cabins are working cabins, and the surrounding 12 cabins are auxiliary cabins, and the interior of the working cabin is filled with barrier explosion-proof materials. In the initial state, the working cabin and the auxiliary cabin are full of oil, and the spare cabin 4 is empty. Since the working cabin uses fuel more frequently, the oil-gas mixture concentration in the cabin is in the combustion and explosion range in most cases. The auxiliary cabin is basically full of oil. At this time, the oil-gas mixture concentration in the cabin is outside the combustion and explosion range, the property is stable, and no combustion and explosion phenomena will occur. An oil hole is set below the partition connecting the working cabin and the auxiliary cabin, and a switchable explosion-proof partition is set at the hole, which is generally in a closed state. When the fuel in the working cabin is exhausted, the oil hole is opened, and the oil in the auxiliary cabin is pumped out by the oil pump in the working cabin for use in the working cabin. Since the volume of a single working compartment is larger than that of a single auxiliary compartment, all the oil in the auxiliary compartment is pumped out at this time, and the oil-gas mixture concentration in the compartment is still outside the combustion and explosion range, so combustion and explosion will not occur.

[0020] Liquid 3 can be water or shear thickening liquid (STP). When the foreign object penetrates the oil depot shell 1, the small perforation causes the explosion energy to be concentrated in a small area, forming a concentrated energy jet. At this time, liquid 3 is sprayed from the perforation, and the fine particles of liquid 3 impact the jet and exert 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 reflection pulse through the inner and outer shells of the oil depot to interfere with the jet stability.

[0021] The self-sealing layer 5 is wrapped on the outer wall of the inner shell 2 of the oil depot. When a foreign object penetrates the inner shell of the oil depot, the self-sealing layer 5 can shrink and rebound to reduce the perforation area. At the same time, a small amount of fuel leaks inside the oil depot, which can fill the perforation to a certain extent, thereby achieving a self-sealing effect of the perforation. The structure of the self-sealing layer 5 is a protective skeleton layer, a liquid rubber layer and a barrier layer from the outside to the inside.

[0022] In order to achieve the purpose of multi-level joint protection, this embodiment also provides a multi-level joint protection alarm method for an oil depot, comprising the following steps: (1) Setting protection priorities: the outer shell 1 and liquid 3 of the oil depot 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; (2) Set the protective layer damage state {S1=penetration, S2=contact explosion}; (3) Obtain the alarm boundary of each priority protection layer under different damage states.

[0023] The relevant parameters required to determine the alarm boundaries of each protection priority include: (1) The first level of protection includes the strength of the oil tank shell 1 ,thickness d 1. The quality of external objects m , Charge amount W , cross-sectional area A , and the density of liquid 3 , jet velocity u , jet mass flow , drag coefficient ; (2) The second protective layer includes the dynamic viscosity of the liquid rubber ,density , the strength of the barrier layer ,thickness , and the residual mass of the external object m 2. Cross-sectional area A ,diameter ; (3) The third level of protection includes the strength of the cabin bulkhead 6 ,thickness d 6. And the remaining mass of the external object m 3. Charge quantity W 3. Cross-sectional area A ; In real applications, when the process of foreign object penetration is short and action cannot be taken in time, it is necessary to predict and simulate the possible breakthrough of the protection limit and take corresponding actions in advance. After each level of alarm boundary is triggered, the oil depot will take relevant actions, which are as follows: (1) The alarm boundary of the first-level protection layer is triggered, and liquid 3 is sprayed 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.

[0024] Specifically, when the first-level protection layer alarm boundary is triggered, liquid 3 sprays outward from the gap caused by foreign objects. During the spraying process, liquid 3 will generate a jet to affect the movement of foreign objects. If the second-level protection layer alarm boundary is not triggered, the oil in the auxiliary compartment does not flow; if the second-level protection layer alarm boundary is triggered, it means that the auxiliary compartment may be damaged. In order to prevent foreign objects from entering the auxiliary compartment and causing an explosion, it is necessary to calculate whether the volume concentration of the remaining 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 pump. If the third-level protection layer alarm boundary is not triggered, the oil in the working compartment does not flow; if the third-level protection layer alarm boundary is triggered, in order to prevent foreign objects from entering the working compartment, it is necessary to calculate whether the volume concentration of the remaining 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 pump.

[0025] This method can pre-judge the model and other parameters of the foreign object, obtain the speed, kinetic energy, and explosion-related parameters of the foreign object through the data already stored in the database, and judge whether the parameters can trigger the alarm boundaries of each layer of protection. If the alarm boundary cannot be triggered, the oil in the oil depot will not flow; if the alarm boundary can be triggered, the oil in the oil depot will flow according to the corresponding action that can trigger the alarm boundary. Example

[0026] In this embodiment, it is assumed that when the protection layer damage state is S1, the alarm boundary of each priority protection layer is calculated.

[0027] 1. Calculation method of the first-level protection layer alarm boundary Step S101, obtaining the strength of the oil depot shell 1 t ,thickness , through the mass of the external object m , Charge amount W , cross-sectional area A Fitting to obtain the kinetic energy when the foreign object begins to penetrate the oil depot shell 1 E 1 and speed v 1; Step S102: the preset kinetic energy threshold of the oil depot shell 1 is reached. For comparison, if E 1> E 1th , the oil depot shell 1 can be penetrated and broken through, thereby establishing the first-level protection layer warning boundary.

[0028] In step S101, based on the initial mass of the foreign object m 1. Initial charge W 1. Cross-sectional area A The speed of obtaining foreign objects is based on the strength of the oil tank shell 1. ,thickness d 1 Obtain the kinetic energy of the foreign object penetrating the oil depot shell 1 E 1 and speed v 1 , (1) in, k is the comprehensive proportional coefficient. According to formula (1), we can get kinetic energy, velocity and mass m 1. Charge quantity W 1. Cross-sectional area A The linear relationship , (2) The curve of velocity and kinetic energy is obtained by formula (2), which is consistent with the preset kinetic energy threshold of the oil depot shell 1 penetration. For comparison, if E 1> E 1th , the oil depot shell 1 can be penetrated and broken through, thereby establishing the first-level protection layer warning boundary.

[0029] After the foreign object passes through the oil depot shell 1, the remaining kinetic energy is estimated according to the law of conservation of energy. E’ 1 and the corresponding second speed v’ 1 , (3) in, F 1 is the average resistance of the oil depot shell 1 to external objects, Average resistance of the oil tank shell 1 to external objects F 1 can be estimated from experimental data.

[0030] After the foreign object penetrates the oil depot shell 1, the kinetic energy will be reduced due to the interception of the oil depot shell 1 and the influence of the liquid jet. Assuming that the jet formed by liquid 3 acts symmetrically on the foreign object, when the foreign object penetrates into liquid 3, the objective function of the influence of the liquid 3 jet on the foreign object is established. , (4) in, The amount of foreign matter in liquid 3 changes with time t The speed of change, is the drag coefficient, is the liquid density, u is the jet velocity of liquid 3, is the mass flow rate of liquid 3 jet, m 2 is the remaining mass after the foreign object penetrates the oil tank shell 1. Time t , jet velocity u and 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 of the foreign object after penetrating the oil depot shell 1 is m 2 and remaining charge W 2 is estimated by formula (5) , (5) in, k’ is the 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 a foreign charge, such as a copper bullet E m =1×10 6 Joule / kg, the explosion energy per unit mass of the internal charge E b =2.5×10 6 Joule / kg.

[0031] 2. Calculation method of the second level protection layer warning boundary 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.

[0032] The speed of the liquid rubber layer after blocking the external object v 2 and residual kinetic energy E 2 Calculated by formula (6) , (6) in, is the dynamic viscosity of the liquid rubber, is the density of liquid rubber, is the resistance coefficient of liquid rubber, is the external object diameter.

[0033] Assuming that there is no mass loss when the foreign object penetrates the liquid rubber layer, the speed at which the foreign object penetrates the barrier layer is v’ 2 and kinetic energy E’ 2 Calculated by formula (7) , (7) in, is the barrier layer strength, is the thickness of the barrier layer, is the average resistance of the barrier layer to external objects. v’ 2 and kinetic energy E’2 is the second level protection layer warning boundary. And the preset barrier layer penetration kinetic energy threshold For comparison, if E’ 2> E 2th , the barrier layer can be penetrated.

[0034] 3. Calculation method of the third level protection layer warning boundary The method for obtaining the third-level protection layer warning boundary is similar to the method for obtaining the first-level protection layer warning boundary when the protection layer damage state is S1. m 3. Charge quantity W 3. Cross-sectional area A , and the strength of the cabin partition 6 ,thickness d 6 Fitting to obtain the kinetic energy that triggers the third level protection layer alarm boundary E 3 and speed v 3 Correlation curve, that is , (8) When the foreign object approaches the third level of protection, its mass and charge will be lost due to the interception of the second level of protection barrier. m 3 and charge amount W 3 Obtained by formula (9) , (9) Example

[0035] In this embodiment, it is assumed that when the protective layer is damaged in the state S2, the contact explosion is an explosion that occurs outside the oil depot. The explosion wave and debris generated will have an impact on the oil depot. First, the degree of damage to the oil depot caused by the explosion is calculated. If the oil depot is not damaged, the impact of the explosion fragments on the oil depot is calculated. Whether the fragments as foreign objects trigger the alarm boundary of each level of protective layer is the same as in the first embodiment, except that the initial speed of the fragments is and kinetic energy According to the quality of the projectile M , Charge type, Charge quantity W To obtain, as shown in formula (10) , (10) in, is the Gurney constant, which is related to the charge type and is expressed in meters per second. The fragments can be divided into N parts according to the mass of the foreign matter. Replace with v 1 Calculate the alarm boundaries of each level of protection layer.

[0036] Since the trajectory of the fragments after the explosion spreads outward from the explosion center point, there may be multiple fragments acting on the oil depot at the same time. The liquid 3 in the oil depot generates multiple jets due to multiple fragments at the same time. Different jets may cause asymmetric impact forces on external objects, thereby comprehensively affecting the movement state of the fragments. Therefore, it is necessary to quantize the impact forces of each jet. x , y Decompose in the direction and sum the vectors of the total impact force affecting each fragment, specifically: Get the impact force of the jet corresponding to the fragment ,in is the resistance of the liquid jet to the bullet, is the momentum exchange force of the liquid jet on the bullet , The impact force of the jet is decomposed into x and y Direction Component ,in , Respectively i Jets x and y The unit direction of the direction, ; Get the impact force of each jet except the jet corresponding to the fragment ,in, is the liquid density, A l For the l The cross-sectional area of ​​the fragments, assuming that the cross-sectional areas of the fragments are equal, u l For liquid 3 l The jet velocity, For the l The unit direction of the jet direction is related to the jet and x The axis angle is related; The impact force of each jet is decomposed into x and y Component in the axial direction , in, , For the l The jet and x Angle of the axis (horizontal direction); Get the total impact x and y The amount ,in n is the number of jets; The total impact force is .

[0037] The direction of the jet can be obtained according to the shape and energy release mode of the simulated explosive, as well as the distance from the oil depot during the explosion.

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 near the inner wall of the oil depot inner shell (2) The storage is an auxiliary cabin, and the sub-oil storage surrounding the spare cabin (4) and surrounded by the auxiliary cabin is a working cabin. The working cabin and the spare cabin (4) are connected 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, and the oil flows unidirectionally from the auxiliary cabin to the working cabin, and the oil flows unidirectionally 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. A three-level protection layer is provided: the oil depot shell (1) is a first-level protection layer, the self-sealing layer (5) is a second-level protection layer, and the cabin partition (6) is a third-level protection layer; 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 conditions, 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 first-level protection layer warning boundary include the strength of the oil tank shell (1) ,thickness d 1. The quality of external objects m , Charge amount W , cross-sectional area A ; The parameters required for calculating the warning boundary of the second-level protection layer include the dynamic viscosity of the liquid rubber ,density , the strength of the barrier layer ,thickness d 2. And the remaining mass of the external object m 2. Cross-sectional area A ,diameter d b ; The parameters required for calculating the warning boundary of the third level protection layer include the strength of the cabin partition (6) ,thickness d 6. And the remaining mass of the external object m 3. Charge quantity W 3. Cross-sectional area A .

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: The first level protection layer alarm boundary is triggered, and the liquid (3) is sprayed at the perforation caused by the foreign object; The second level protection layer alarm boundary is triggered, and the oil flows from the auxiliary compartment to the working compartment; The third level protection layer alarm boundary is triggered, and the oil flows from the working compartment to the spare compartment (4).

4. The method according to claim 3, characterized in that The method for obtaining the first-level protection layer alarm boundary is as follows: according to the strength of the oil depot shell (1) ,thickness d 1. The quality of external objects m , Charge amount W , cross-sectional area A Fitting to obtain the kinetic energy of the foreign object when it penetrates the oil depot shell (1) E 1 and speed v 1. Kinetic Energy E 1 and speed v 1 is the first level protection layer alarm boundary ， in, k is the comprehensive proportionality coefficient.

5. The method according to claim 4, characterized in that The method for obtaining the second-level protection layer alarm boundary is as follows: According to the residual speed of the liquid (3) after the impact of the external object , Dynamic viscosity of liquid rubber ,density , drag coefficient , and the residual mass of the external object m 2. Cross-sectional area A ,diameter d b Get the remaining speed of the foreign object after penetrating the liquid rubber v 2 and residual kinetic energy E 2; ， in, The foreign matter in the liquid (3) changes with time t The speed of change, m 2 is the remaining mass of the foreign object after penetrating the oil tank shell (1); According to the remaining speed v 2 and residual kinetic energy E 2. And the strength of the barrier layer ,thickness d 2 Fitting to obtain the speed of foreign objects penetrating the barrier layer v’ 2 and kinetic energy E’ 2. Speed v’ 2 and kinetic energy E’ The relationship 2 is the alarm boundary of the second-level protection layer.

6. The method according to claim 5, characterized in that The foreign matter in the liquid (3) changes with time t The speed of change and the remaining mass of the foreign object after penetrating the tank shell (1) m 2 The method to obtain is ， ， in, is the density of liquid (3), u is the jet velocity of liquid (3), is the mass flow rate of the liquid (3) jet, is the resistance coefficient of liquid (3), is the residual velocity of the foreign object after it penetrates the oil tank shell (1), ， F 1 is the average resistance of the oil tank shell (1) to external objects.

7. The method according to claim 5, characterized in that According to the strength of the cabin partition (6) ,thickness d 6. And the remaining mass of the external object m 3. Charge quantity W 3. Cross-sectional area A Fitting to obtain the kinetic energy of penetrating the cabin bulkhead (6) E 3 and speed v 3. Kinetic energy E 3 and speed v 3 is the third level protection layer alarm boundary ， in, W 3 is the amount of charge remaining in the foreign object after penetrating the barrier layer, m 3 is the amount of explosive remaining in the foreign object after penetrating the barrier layer.

8. The method according to claim 7, characterized in that The amount of explosive in the foreign object after penetrating the barrier layer W 3. Quality m 3 Obtained by the following formula ， ， in, W 2 is the remaining charge of the foreign object after penetrating the oil depot shell (1), k’ is the empirical coefficient, E b It is the explosion energy per unit mass of foreign charge.

9. According to the method of claim 8, 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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