CN113492998A - Experimental device and experimental method for simulating projectile multi-angle impact of aircraft fuel tank - Google Patents
Experimental device and experimental method for simulating projectile multi-angle impact of aircraft fuel tank Download PDFInfo
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- CN113492998A CN113492998A CN202110057091.2A CN202110057091A CN113492998A CN 113492998 A CN113492998 A CN 113492998A CN 202110057091 A CN202110057091 A CN 202110057091A CN 113492998 A CN113492998 A CN 113492998A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
Abstract
An experimental device and an experimental method for simulating a projectile multi-angle impact aircraft fuel tank. The box body in the experimental device is arranged on the upper surface of a constant-temperature heating table; the first target plate and the second target plate are respectively arranged on the outer surface of the front wall plate of the box body; the third target plate, the fourth target plate and the fifth target plate are respectively arranged on the outer surface of the rear wall plate of the box body. The temperature, pressure change data and gas concentration value in the experimental oil tank are recorded in real time through the pressure sensor, the temperature sensor and the gas concentration tester. The invention can simulate the impact states of different target plates, different types of bullets and bullets on the fuel tank at different speeds under the conditions of different fuel volume fractions and different fuel vapor concentrations. The combination of different target boards makes the shooting angle more to incident target board and emergent target board are torn open and are traded the convenience, can shorten the experimental period, have realized quick repeated experiment many times, and whole experiment platform has simple structure, easily operation, characteristics with low costs and the commonality is strong.
Description
Technical Field
The invention relates to the field of high-viability design of a fuel tank of a combat aircraft, in particular to an experimental device and an experimental method for simulating projectile multi-angle impact on the fuel tank of the aircraft.
Background
Combat aircraft viability refers to the ability of an aircraft to avoid or withstand a human hostile environment. The improvement of the viability of the airplane has extremely important significance for reducing the loss of airplane weapon systems and maintaining the number of the operational airplanes so as to keep the battle capacity of troops, and the high viability design becomes one of the important indexes for designing new generation military airplanes in the current aviation countries.
Aircraft fuel tanks are devices used to store fuel for engines and auxiliary power equipment, and the exposed area of the fuel tank usually accounts for more than 50% of the whole aircraft and is the most vulnerable part on the aircraft. The fuel contained in the fuel tank belongs to flammable and explosive articles, and the combustion and explosion generated after the fuel tank is attacked by threats are the main reasons for killing the airplanes in a battlefield environment. The mechanism of the fuel tank burning or explosion under the impact of the projectile is researched, and corresponding anti-burning and explosion suppression measures can be adopted, so that the burning or explosion caused by the projectile entering the oil gas space is suppressed, the combat loss of the combat aircraft due to the damage of a fuel oil system is reduced, and the method has important guiding significance for the high-viability design of the aircraft fuel tank. Therefore, it is necessary to perform an experiment related to the impact of the projectile on the fuel tank.
The impact of a projectile or other threat conveyance on an aircraft fuel tank causes it to ignite or detonate is subject to a number of factors, typically including projectile velocity and firing angle, fuel tank material and thickness, fuel vapor concentration and temperature, and the like. When the shot penetrates the skin and the wall plate of the oil tank to enter the oil-gas space, the main reason for causing combustion or explosion in the oil tank is collision sparks generated by metal shots or fragments in the process of penetrating the wall of the oil tank, and high-temperature areas are formed on the surfaces of the metal shots or fragments due to friction effect, so that combustion or explosion of oil-gas mixtures in the oil tank is caused.
In the aircraft operation process, the attack direction of the threat has uncertainty, and the research on the dynamic response of the threat impacting the aircraft fuel tank along different directions is helpful for determining the weak link and the main threat direction of the fuel tank. Relevant studies have shown that: the killing degrees of fuel tanks caused by different hitting directions are obviously different, and the fuel states including the fuel vapor concentration, the temperature, the pressure and other parameters have great influence on the main threat direction, the vulnerable area and the killing probability of the airplane. Therefore, it is of great interest to perform experiments simulating multi-angle ballistic aircraft fuel tanks, with several typical directions of general interest being 0 °, 30 °, 45 ° and 60 °.
At present, the fire prediction of the aircraft fuel tank at home and abroad has less related research, and particularly the problem of ignition when a projectile impacts the aircraft fuel tank at different angles is solved. Aiming at the research of the ignition mechanism of the fuel tank, the early foreign development of the American military started from the last 60 th century, and a great deal of experiments were carried out on the ignition of the fuel tank of the battle bucket. The influence of factors such as fuel tank materials, fragment speed, aircraft altitude, environment temperature and the like on the ignition and explosion probability of a military aircraft fuel tank is studied in an experimental way by the Laite air force base laboratory. In the aspect of China, the Shayan character of Beijing university of science and technology and the like carry out impact experiments on a kerosene oil tank and a diesel oil tank when the powerful research is carried out on the explosive-killing warhead; the ignition mechanism and the ignition criterion of the energy-containing fragments on the diesel tank are analyzed by a method of combining theories and experiments and combining thermodynamics, combustibility and impact mechanics.
The experimental device disclosed in patent 104198519a adopts an ignition device to ignite fuel gas space, and cannot simulate a live-fire firing fuel tank; both the test stand described in patent 102539139a and the experimental device described in patent CN102632998A can be used for simulating that an aircraft fuel tank is impacted by a projectile, but only simulating that the projectile impacts the fuel tank along a direction vertical to a target plate; the test bed in patent CN102632998A adopts hasp connection apron and box, and the gas tightness is relatively poor and can not reflect the destruction condition after real oil tank receives the live ammunition and assaults. Foreign related organizations adopt a method of increasing the size of the emergent target plate to increase the range of the shooting angle, but the experimental device has the defects of wasting the target plate material, consuming high cost and the like, and the range of the angle increase is very limited.
The problems in the prior art can be summarized as the following points: 1. the experimental oil tank has poor universality, and is designed only for oil tanks of certain types of airplanes, armored vehicles or cruise missiles and the like; 2. the experimental oil tank is mainly used for impacting a target plate by the projectile at an attack angle of 0 degrees and cannot be used for simulating the impact of the projectile on the fuel tank at other angles; 3. the experiment consumes highly, consuming time long, and an oil tank can all be destroyed in every experiment, and the experiment platform is difficult to be built and tear open and trade, leads to experiment cycle length, expense height.
Disclosure of Invention
In order to overcome the defects that the experimental fuel tank in the prior art is poor in universality, can only be used for simulating the impact of a projectile on a target plate at an attack angle of 0 degrees, and is high in test cost and long in time consumption, the invention provides an experimental device and an experimental method for simulating the fuel tank of a projectile multi-angle impact airplane.
The experimental device for simulating the projectile multi-angle impact aircraft fuel tank comprises a tank body, a target plate, an oil outlet valve, a safe pressure relief cover, a pressure sensor, a temperature sensor, a gas concentration tester and a constant temperature heating table, wherein the target plate is arranged on the tank body; wherein the target plates comprise a first target plate, a second target plate, a third target plate, a fourth target plate and a fifth target plate; the box body is arranged on the upper surface of the constant-temperature heating table; the first target plate and the second target plate are respectively arranged on the outer surface of the front wall plate of the box body; the third target plate, the fourth target plate and the fifth target plate are respectively arranged on the outer surface of the rear wall plate of the box body; the safety pressure relief cover is arranged at the geometric center of the upper surface of the box body; an oil outlet is arranged at the lower part of a wall plate at one end of the box body; an oil outlet valve is arranged on the oil outlet; and recording the temperature, pressure change data and gas concentration value inside the experimental oil tank in real time through the pressure sensor, the temperature sensor and the gas concentration tester.
Target plate mounting holes are respectively formed in the front wall plate and the rear wall plate of the box body; sleeves are respectively fixed on the target plate mounting holes; the first target plate, the second target plate, the third target plate, the fourth target plate and the fifth target plate are respectively sleeved on the sleeves.
The center of each target plate mounting hole is positioned at the position of 300-400 mm of the height of the box body, and the lower edge of each target plate mounting hole is positioned above the surface of oil liquid in the oil tank, so that the oil liquid is prevented from leaking from each target plate mounting hole.
When the target plates are installed, the geometric center of each target plate is superposed with the center of the target plate installation hole; the mounting holes of the first target plate and the mounting holes of the third target plate are concentric.
The distance between the first target plate and the second target plate is equal to the width of the box body; the centre distance between the third target plate and the fourth target plate is equal to the width of the box body
Doubling; the center distance between the third target plate and the fifth target plate is equal to the width of the box body
And (4) doubling.
The two ends of the sleeve are respectively provided with an end plate, the end plate at one end of the sleeve is fixed on the box body, and a sealing rubber gasket is arranged between the surface of the box body and the surface of the end cover; the target plate is fixed on the outer surface of the end plate at the other end of the sleeve through a connecting bolt, and a sealing rubber gasket is arranged between the inner surface of the target plate and the surface of the end cover.
Each target plate is made of aluminum alloy or magnesium-aluminum alloy or composite material or stainless steel; the thickness of the target plate simulates the thickness of an oil tank and is 1.5-5.0 mm according to different materials of the oil tank.
The safety pressure relief cover is made of rubber sheets with the thickness of 1-3 mm, the lower end of the safety pressure relief cover is sleeved and fixed on the sleeve 14, and the sleeve is fixed on a through hole in the geometric center of the upper cover of the box body.
The experimental process for simulating the multi-angle impact of the projectile on the fuel tank of the airplane provided by the invention comprises the following steps:
determining the material of the target plate; the determined target plate material is the same as the material of the fuel tank of the airplane.
Determining the thickness of the target plate: calculating the thickness h of the target plate by the formula (1)ci：
In the formula hciIs the thickness of the target plate; sigmabiThe ultimate strength of the material of the fuel tank of the airplane; sigmabciThe ultimate strength of the target plate material; rhoiIs the aircraft fuel tank material density; rhociIs the density of the target board material; h is the thickness of the fuel tank material of the airplane;
setting 4 experimental control groups which are respectively a first experimental control group, a second experimental control group, a third experimental control group and a fourth experimental control group according to different mission profiles of the combat aircraft; the determined fuel filling amount of the fuel tank in each experimental control group is respectively 10%, 20%, 30% and 40% in sequence; the unit of the fuel oil adding amount is volume fraction.
the experiments of the first experimental control group include a 0 ° impact experiment, a 30 ° impact experiment, a 60 ° impact experiment, and a 45 ° impact experiment.
I0 degree impact test
The 0-degree impact test comprises impact tests of four speeds of 500m/s projectile speed, 600m/s projectile speed, 800m/s projectile speed and 1000m/s projectile speed.
I, a 500m/s projectile velocity impact test;
adding fuel into the box body according to the fuel adding amount of the first experiment control group determined in the step 2; and installing and fixing the safe pressure relief cover after oiling.
Heating the fuel oil; heating the fuel in the box body to 50 ℃ and keeping for 5-10 min, and simultaneously testing the concentration of fuel vapor;
the shot is shot to carry out experiments, and specifically comprises the following steps:
taking the first target plate as an injection target and taking the third target plate as an injection target; adjusting the shooting angle of a ballistic gun to enable a shooting line to be superposed with the geometric central line of the first target plate to form a 0-degree shooting angle, so that shot is shot from the target center of the first target plate and shot from the target center of the third target plate; setting the speed of the shot to be 500 m/s; launching the projectile; observing whether the fuel tank is ignited or detonated after the shot is shot from the first target plate target center to the third target plate target center, and recording related data;
the impact test at a projectile velocity of 500m/s was completed.
Ii, a shot velocity impact test at 600 m/s;
adjusting the shooting speed to 600 m/s; and repeating the process of the impact experiment of the projectile velocity of 500m/s to complete the impact experiment of the projectile velocity of 600 m/s.
Iii 800m/s projectile velocity impact test;
adjusting the shooting speed to 800 m/s; and repeating the process of the impact experiment of the projectile velocity of 500m/s to complete the impact experiment of the projectile velocity of 800 m/s.
Iv, a projectile velocity impact experiment at 1000 m/s;
adjusting the shooting speed to 1000 m/s; and repeating the process of the impact experiment of the projectile velocity of 500m/s to complete the impact experiment of the projectile velocity of 1000 m/s.
So far, completing a 30-degree impact experiment; the fuel in the fuel tank is discharged and the inside of the fuel tank is ventilated and purged.
So far, completing a 0-degree impact experiment; the fuel in the fuel tank is discharged and air is introduced into the fuel tank to discharge the exhaust gas.
II 30 degree impact test
The 30-degree impact experiment comprises impact experiments of four speeds of 500m/s projectile speed, 600m/s projectile speed, 800m/s projectile speed and 1000m/s projectile speed;
and (3) adding fuel into the box body and installing a safety pressure relief cover according to the fuel adding amount of the first experiment control group determined in the step (2).
Heating the fuel oil; and heating the fuel oil in the box body to 50 ℃ and keeping the temperature for 5-10 min, and simultaneously testing the concentration of the fuel oil vapor.
The shot is shot to carry out the experiment, and the specific process is as follows:
taking the first target plate as an injection target and taking the fourth target plate as an injection target; and adjusting the shooting angle of the ballistic gun to enable a shooting line to pass through the geometric center of the first target plate and the geometric center of the fourth target plate to form a 30-degree shooting angle, so that shot is shot from the target center of the first target plate and shot from the target center of the fourth target plate.
Launching the projectile; and sequentially repeating the processes of the impact experiments of the four speeds of 500m/s, 600m/s, 800m/s and 1000m/s of the projectile speed recorded in the 0-degree impact experiment, and respectively finishing the impact experiments at the speeds.
And respectively observing whether the fuel tank is ignited or detonated after the shot is shot from the first target plate target center to the third target plate target center and is shot from the third target plate target center in the impact test at each speed, and recording related data.
Completing a 30-degree impact experiment; the fuel in the fuel tank is discharged and the inside of the fuel tank is ventilated and purged.
III 60 degree impact test
The 60-degree impact test comprises impact tests of four speeds of 500m/s of projectile speed, 600m/s of projectile speed, 800m/s of projectile speed and 1000m/s of projectile speed.
And (3) adding fuel into the box body and installing a safety pressure relief cover according to the fuel adding amount of the first experiment control group determined in the step (2).
Heating the fuel oil; and heating the fuel oil in the box body to 50 ℃ and keeping the temperature for 5-10 min, and simultaneously testing the concentration of the fuel oil vapor.
Launching the projectile for experiment; the specific process is as follows:
taking the first target plate as an injection target and taking a fifth target plate as an injection target; and adjusting the shooting angle of the ballistic gun to enable a shooting line to pass through the geometric center of the first target plate and the geometric center of the fifth target plate to form a 60-degree shooting angle, so that shot is shot from the target center of the first target plate and shot from the target center of the fifth target plate.
Launching the projectile; sequentially repeating the processes of the impact experiments of the four speeds of 500m/s, 600m/s, 800m/s and 1000m/s of the projectile speed recorded in the 0-degree impact experiment, and respectively finishing the impact experiments at all the speeds;
and respectively observing whether the fuel tank is ignited or detonated after the shot is shot from the first target plate target center to the fifth target plate target center and is shot from the fifth target plate target center in the impact test at each speed, and recording related data.
Completing a 60-degree impact experiment; the fuel in the fuel tank is discharged and the inside of the fuel tank is ventilated and purged.
IV 45 degree impact test
The box body is rotated by 180 degrees, so that the box body rear wall plate of the box body faces the ballistic gun.
The 45-degree impact test comprises impact tests of four speeds of 500m/s projectile speed, 600m/s projectile speed, 800m/s projectile speed and 1000m/s projectile speed.
And (3) adding fuel into the box body and installing a safety pressure relief cover according to the fuel adding amount of the first experiment control group determined in the step (2).
Heating the fuel oil; and heating the fuel oil in the box body to 50 ℃ and keeping the temperature for 5-10 min, and simultaneously testing the concentration of the fuel oil vapor.
Launching the projectile for experiment; the specific process is as follows:
taking the third target plate as an injection target and the second target plate as an injection target; and adjusting the shooting angle of the ballistic gun to enable a shooting line to pass through the geometric center of the third target plate and the geometric center of the second target plate to form a 45-degree shooting angle, so that shot is shot from the target center of the third target plate and shot from the target center of the second target plate.
Launching the projectile; and sequentially repeating the processes of the impact experiments of the four speeds of 500m/s, 600m/s, 800m/s and 1000m/s of the projectile speed recorded in the 0-degree impact experiment, and respectively finishing the impact experiments at the speeds.
And respectively observing whether the fuel tank is ignited or detonated after the shot is shot from the first target plate target center to the fifth target plate target center and is shot from the fifth target plate target center in the impact test at each speed, and recording related data.
Completing a 45-degree impact experiment; the fuel in the fuel tank is discharged and the inside of the fuel tank is ventilated and purged.
in the experiment of the second experiment control group, the fuel filling amount of the fuel tank is 20%; the unit of the fuel oil adding amount is volume fraction.
The box body is rotated by 180 degrees, so that the front wall surface of the box body faces the ballistic gun.
The experiments of the second experimental control group include a 0 ° impact experiment, a 30 ° impact experiment, a 60 ° impact experiment, and a 45 ° impact experiment.
Repeating the experimental process of the first experimental control group, and sequentially completing a 0-degree impact experiment, a 30-degree impact experiment and a 60-degree impact experiment of a second experimental control group; after the 0-degree impact experiment, the 30-degree impact experiment and the 60-degree impact experiment are completed, rotating the box body by 180 degrees to enable the box body rear wall plate of the box body to face the ballistic gun; and repeating the experimental process of the first experimental control group to complete the 45-degree impact experiment of the second experimental control group.
in the experiment of the third experiment control group, the fuel filling amount of the fuel tank is 30%; the unit of the fuel oil adding amount is volume fraction.
The box body is rotated by 180 degrees, so that the front wall surface of the box body faces the ballistic gun.
Repeating the experimental process of the first experimental control group, and sequentially completing a 0-degree impact experiment, a 30-degree impact experiment and a 60-degree impact experiment of a third experimental control group; after the 0-degree impact experiment, the 30-degree impact experiment and the 60-degree impact experiment are completed, rotating the box body by 180 degrees to enable the box body rear wall plate of the box body to face the ballistic gun; and repeating the experimental process of the first experimental control group to complete the 45-degree impact experiment of the third experimental control group.
in the experiment of the fourth experiment control group, the fuel filling amount of the fuel tank is 40%; the unit of the fuel oil adding amount is volume fraction.
The box body is rotated by 180 degrees, so that the front wall surface of the box body faces the ballistic gun.
Repeating the experimental process of the first experimental control group, and sequentially completing a 0-degree impact experiment, a 30-degree impact experiment and a 60-degree impact experiment of a fourth experimental control group; after the 0-degree impact experiment, the 30-degree impact experiment and the 60-degree impact experiment are completed, rotating the box body by 180 degrees to enable the box body rear wall plate of the box body to face the ballistic gun; and repeating the experimental process of the first experimental control group to complete the 45-degree impact experiment of the fourth experimental control group.
So far, the experiment of simulating the projectile multi-angle impact aircraft fuel tank is completed.
The materials and the thicknesses of the incident target plate and the emergent target plate are determined according to the type of a research target, and the universality is high. Only damage is caused to the target plate in a single striking experiment, the structure of the oil tank cannot be damaged, the target plate is easy to replace and operate, the experiment cost is effectively reduced, and the experiment period is shortened. Different target plates are used as an incident target plate and an emergent target plate to simulate 0 degrees, 30 degrees, 45 degrees and 60 degrees of impact on the fuel tank, and when the projectile is injected into and ejected from a target center of the target plate, the simulated angle ranges from 0 degrees to 65 degrees.
The method is used for simulating the ignition or detonation condition of the fuel tank after the projectile penetrates through the wall plate of the aircraft fuel tank at different angles and enters the oil gas space, the probability of the ignition/detonation of the fuel tank under a certain working condition is obtained by adopting a frequency statistics method, the pressure and temperature change data of the whole process of the multi-angle projectile impact fuel tank are collected by the pressure sensor and the temperature sensor which are arranged above the tank body, and the ignition or detonation process of the fuel tank can be recorded by the high-speed camera. The invention can simulate whether the fuel tank is ignited or detonated when target plates of different materials, target plates of different thicknesses, different types of bullets and bullets impact the fuel tank at different speeds under the conditions of different fuel volume fractions and different fuel vapor concentrations. The adopted safety pressure relief cover can protect the box body; the combination of different target boards makes the shooting angle more to incident target board and emergent target board are torn open and are traded the convenience, can shorten the experimental period, have realized quick repeated experiment many times, and whole experiment platform has simple structure, easily operation, characteristics with low costs and the commonality is strong.
To illustrate the effects of the present invention, experimental verification was performed by taking a 0 ° impact test as an example. The results of the experiment are shown in the following table:
statistical results of experimental data
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is an isometric view of the fuel tank of the present invention.
FIG. 3 is an isometric view of the fuel tank of the present invention.
FIG. 4 is a front view of the fuel tank of the present invention.
FIG. 5 is a left side view of the fuel tank of the present invention.
FIG. 6 is a top plan view of the fuel tank of the present invention.
FIG. 7 is a sectional view taken along line A-A of the fuel tank of the present invention.
FIG. 8 is a sectional view taken along line B-B of the fuel tank of the present invention.
Fig. 9 is a schematic view of the connection between the safety pressure relief cover and the tank of the present invention.
FIG. 10 is a schematic view of the connection of the target plate and the sleeve according to the present invention.
FIG. 11 is a schematic structural view of the bottom bracket of the present invention.
FIG. 12 is a schematic diagram of pressure change during a projectile firing of a fuel tank.
FIG. 13 shows the phenomenon of fuel tank ignition when V is 500 m/s; wherein: fig. 13a shows the ignition moment, fig. 13b shows the explosion moment, fig. 13c shows the sustained combustion, and fig. 13d shows the flame about to go out.
FIG. 14 shows the phenomenon of fuel tank ignition when V is 800 m/s; wherein: fig. 14a shows the ignition moment, fig. 14b shows the explosion moment, fig. 14c shows the sustained combustion, and fig. 14d shows the flame about to extinguish.
FIG. 15 is a target plate through hole; wherein: fig. 15a is a circular perforation of the target plate, fig. 15b is a petal-shaped perforation of the target plate, and fig. 15c is a tear-shaped perforation of the target plate.
FIG. 16 is an impact spark captured by a high speed camera; wherein: fig. 16a shows a case where v is 500m/s, fig. 16b shows a case where v is 600m/s, fig. 16c shows a case where v is 800m/s, and fig. 16d shows a case where v is 1000 m/s.
FIG. 17 is a view showing a large number of sparks generated at the rear of the exit target; wherein: fig. 17a shows a case where v is 525m/s, fig. 17b shows a case where v is 791m/s, and fig. 17c shows a case where v is 795 m/s.
FIG. 18 is a schematic diagram of a fuel tank kill probability function.
In the figure: 1. a computer; 2. a pressure sensor; 3. a temperature sensor; 4. a box body; 5. a handle; 6. angle steel; 7. a support; 8. an oil outlet valve; 9. a constant temperature heating stage; 10. a first target plate; 11. a second target plate; 12. sealing a rubber gasket; 13. a sleeve; 14. an upper cover sleeve; 15. a gas concentration tester; 16. sealing the lock ring; 17. a safety pressure relief cover; 18. a third target plate; 19. a fourth target plate; 20. a fifth target plate; 21. an upper cover plate of the box body; 22. a front wall plate of the box body; 23. a box side wall panel; 24. the box body rear wall board.
Detailed Description
The embodiment is an experimental device for simulating projectile multi-angle impact aircraft fuel tank, and comprises a tank body 4, a target plate, a sleeve 13, an oil outlet valve 8, a safe pressure relief cover 17, a pressure sensor 2, a temperature sensor 3, a gas concentration tester 15 and a constant temperature heating table 9. Wherein the target plates comprise a first target plate 10, a second target plate 11, a third target plate 18, a fourth target plate 19 and a fifth target plate 20. The box 4 is placed on the upper surface of the constant temperature heating table 9. The first target plate 10 and the second target plate 11 are respectively arranged on one side surface of the box body; a third target plate 18, a fourth target plate 19 and a fifth target plate 20 are respectively installed at the other side surface of the cabinet. The safety relief cover 17 is installed at the geometric center of the upper surface of the case. An oil outlet is arranged at the lower part of a wall plate at one end of the box body; an oil outlet valve 8 is arranged on the oil outlet. A pressure sensor 2, a temperature sensor 3 and a gas concentration tester 15 are mounted on an upper cover plate of the box body, and the pressure sensor, the temperature sensor and the gas concentration tester are respectively connected with a computer 1 to record temperature, pressure change data and gas concentration values inside an experimental oil tank in real time. Handles 5 are arranged on the wall plates at the two ends of the box body 4; an oil outlet for discharging waste fuel oil in the box body after the experiment is arranged on the side wall plate 23 of the box body on one side; the oil outlet is provided with an oil outlet valve 8.
The bottom support is a frame-shaped bracket formed by welding angle steel 6 and a bracket. And a groove is formed in angle steel on one side of the support and used for placing an oil outlet valve 6.
And 2 constant-temperature heating tables 9 are arranged under the box body and are used for heating fuel oil in the box body, accelerating the fuel oil to volatilize into fuel oil steam, and simultaneously controlling the temperature of the fuel oil and a gas phase space so as to ensure that the temperature of the fuel oil steam is above the flash point of the fuel oil steam and can be ignited or detonated under the action of impact sparks. The temperature of the constant temperature heating table 9 is adjusted according to the experimental requirements; the power of the constant temperature heating stage was 1400W.
The box body 4 is rectangular and made of Q235 steel. In the geometric centre of the upper cover plate of the tank there is an upper cover sleeve 14 for mounting a safety relief cover 17. Two target plate mounting holes are formed in one side wall plate of the box body, and a first target plate 10 and a second target plate 11 are respectively mounted on the two target plate mounting holes; three target plate mounting holes are formed in the other side wall plate of the box body, and a third target plate 18, a fourth target plate 19 and a fifth target plate 20 are respectively mounted on the three target plate mounting holes; when each target plate is installed, the geometric center of each target plate is coincided with the center of the target plate installation hole. The wall plate with two target plate mounting holes is used as the front of the box bodyThe wall board takes the wall board provided with the three target board mounting holes as a box body rear wall board. The center of each target plate mounting hole is positioned at the position of 300-400 mm of the height of the box body, and the lower edge of each target plate mounting hole is positioned above the surface of oil liquid in the oil tank, so that the oil liquid is prevented from leaking from each target plate mounting hole. The mounting holes of the first target plate on the front wall plate of the cabinet and the mounting holes of the third target plate 18 on the rear wall plate of the cabinet are concentric. 2 target plates are arranged on the front wall plate of the box body, 3 target plates are arranged on the rear wall plate of the box body, and the distance between the first target plate 10 and the second target plate 11 is equal to the width of the box body; the centre distance between the third target plate 18 and the fourth target plate 19 being equal to the width of the tank
Doubling; the centre-to-centre distance between the third target plate 18 and the fifth target plate 20 being equal to the width of the tank
And (4) doubling.
In this embodiment, the wall thickness of the box body 4 is 5mm, the length of the bottom surface of the box body is 1000mm, the width is 400mm, and the height of the box body is 500 mm. The aperture of each target plate mounting hole is 160mm, and the distance from the center of each target plate mounting hole to the lower surface of the bottom plate of the box body is 300 mm.
Five sleeves 13 are respectively positioned outside the box body, and one end of each sleeve is respectively arranged outside a target plate mounting hole. The target plates are respectively sleeved on the sleeves. When each target plate is installed, a first target plate and a second target plate are sequentially installed on the front wall plate of the box body, and a third target plate, a fourth target plate and a fifth target plate are sequentially installed on the rear wall plate of the box body.
The sleeve 13 has end plates at both ends, the end plate at one end of the sleeve is fixed on the box body through a connecting bolt, and a sealing rubber gasket 12 is arranged between the surface of the box body and the surface of the end cover. The target plate is fixed to the outer surface of the end plate at the other end of the sleeve by means of connecting bolts, and a sealing rubber gasket 12 is provided between the inner surface of the target plate and the surface of the end cover. The length of the sleeve is 50 mm.
Each target plate is square and is made of conventional oil tank materials, including aluminum alloy or magnesium aluminum alloy or composite materials or stainless steel. The thickness of the target plate also simulates the thickness of the oil tank, and is 1.5-5.0 mm according to different materials of the oil tank.
The safe pressure relief cover 17 is made of rubber sheets with the thickness of 1-3 mm, and after fuel steam in the box body is ignited or detonated, the generated high-pressure gas can burst or jack the safe pressure relief cover, so that the structure of the box body 4 is prevented from being damaged by high pressure. The lower end of the safety relief cover is fitted over the upper cover sleeve 14 and is clamped by a sealing lock ring 16.
The embodiment can simulate whether the fuel tank can be ignited/detonated when target plates of different materials, target plates of different thicknesses, different types of bullets and bullets impact the fuel tank at different speeds under the conditions of different fuel volume fractions and different fuel vapor concentrations in the fuel tank.
The experimental method for applying the experimental device for simulating the projectile multi-angle impact aircraft fuel tank comprises the following steps:
the material of the target plate is determined. The determined target plate material is the same as the material of the fuel tank of the airplane. The target plate material in this example is an aluminum alloy.
Determining the thickness of the target plate: and determining the material and the thickness of the target plate according to the material and the thickness of the fuel tank of the real airplane. Calculating the thickness h of the target plate according to the strength equivalence principle by the formula (1)ci：
In the formula hciIs the thickness of the target plate; sigmabiThe ultimate strength of the material of the fuel tank of the airplane; sigmabciThe ultimate strength of the target plate material; rhoiIs the aircraft fuel tank material density; rhociIs the density of the target board material; h is the thickness of the aircraft fuel tank material.
according to different mission profiles of the combat aircraft, 4 experimental control groups are set, namely a first experimental control group, a second experimental control group, a third experimental control group and a fourth experimental control group. The determined fuel filling amount of the fuel tank in each experimental control group is respectively 10%, 20%, 30% and 40% in sequence; the unit of the fuel oil adding amount is volume fraction.
The experiments of the first experimental control group include a 0 ° impact experiment, a 30 ° impact experiment, a 60 ° impact experiment, and a 45 ° impact experiment.
Impact test at 0 deg.
The 0-degree impact test comprises impact tests of four speeds of 500m/s projectile speed, 600m/s projectile speed, 800m/s projectile speed and 1000m/s projectile speed.
I 500m/s projectile velocity impact test.
And (3) adding fuel into the box body according to the fuel adding amount of the first experiment control group determined in the step (2). After refueling, safety relief cover 17 is installed and seal ring 16 is used to secure safety relief cover 17 to upper cover sleeve 14.
The fuel is heated. And heating the fuel in the box body 4 to 50 ℃ and keeping for 5-10 min, and simultaneously testing the concentration of the fuel vapor.
The shot was launched for the experiment. The method comprises the following steps:
and taking the first target plate as an injection target and taking the third target plate as an injection target. And adjusting the shooting angle of the ballistic gun to enable the shooting line to coincide with the geometric central line of the first target plate to form a 0-degree shooting angle, so that the shot is shot from the target center of the first target plate and shot from the target center of the third target plate. The shot velocity was set to 500 m/s. And (5) launching the projectile. And observing whether the fuel tank is ignited or detonated after the shot is shot from the first target plate target center to the third target plate target center, and recording related data.
The impact test at a projectile velocity of 500m/s was completed.
Ii 600m/s projectile velocity impact test.
The shooting speed was adjusted to 600 m/s. And repeating the process of the impact experiment of the projectile velocity of 500m/s to complete the impact experiment of the projectile velocity of 600 m/s.
Iii 800m/s projectile velocity impact test.
The shooting speed was adjusted to 800 m/s. And repeating the process of the impact experiment of the projectile velocity of 500m/s to complete the impact experiment of the projectile velocity of 800 m/s.
Iv 1000m/s projectile velocity impact test.
The shooting speed was adjusted to 1000 m/s. And repeating the process of the impact experiment of the projectile velocity of 500m/s to complete the impact experiment of the projectile velocity of 1000 m/s.
The 30 ° impact test was completed this time. The fuel in the fuel tank is discharged and the inside of the fuel tank is ventilated and purged.
The 0 ° impact test was completed so far. The fuel in the fuel tank is discharged and air is introduced into the fuel tank to discharge the exhaust gas.
II 30 degree impact test.
The 30-degree impact test comprises impact tests of four speeds of 500m/s of projectile speed, 600m/s of projectile speed, 800m/s of projectile speed and 1000m/s of projectile speed.
And (3) adding fuel into the box body and installing a safety pressure relief cover 17 according to the fuel adding amount of the first experiment control group determined in the step (2).
The fuel is heated. And heating the fuel in the box body 4 to 50 ℃ and keeping for 5-10 min, and simultaneously testing the concentration of the fuel vapor.
The shot was launched for the experiment. The specific process is as follows:
and taking the first target plate as an injection target and taking the fourth target plate as an injection target. And adjusting the shooting angle of the ballistic gun to enable a shooting line to pass through the geometric center of the first target plate and the geometric center of the fourth target plate to form a 30-degree shooting angle, so that shot is shot from the target center of the first target plate and shot from the target center of the fourth target plate.
And (5) launching the projectile. And sequentially repeating the processes of the impact experiments of the four speeds of 500m/s, 600m/s, 800m/s and 1000m/s of the projectile speed recorded in the 0-degree impact experiment, and respectively finishing the impact experiments at the speeds.
And respectively observing whether the fuel tank is ignited or detonated after the shot is shot from the first target plate target center to the third target plate target center and is shot from the third target plate target center in the impact test at each speed, and recording related data.
The 30 ° impact test was completed. The fuel in the fuel tank is discharged and the inside of the fuel tank is ventilated and purged.
Iii 60 ° impact test.
The 60-degree impact test comprises impact tests of four speeds of 500m/s of projectile speed, 600m/s of projectile speed, 800m/s of projectile speed and 1000m/s of projectile speed.
And (3) adding fuel into the box body and installing a safety pressure relief cover 17 according to the fuel adding amount of the first experiment control group determined in the step (2).
The fuel is heated. And heating the fuel in the box body 4 to 50 ℃ and keeping for 5-10 min, and simultaneously testing the concentration of the fuel vapor.
The shot was launched for the experiment. The specific process is as follows:
and taking the first target plate as an incidence target and taking the fifth target plate as an emission target. And adjusting the shooting angle of the ballistic gun to enable a shooting line to pass through the geometric center of the first target plate and the geometric center of the fifth target plate to form a 60-degree shooting angle, so that shot is shot from the target center of the first target plate and shot from the target center of the fifth target plate.
And (5) launching the projectile. And sequentially repeating the processes of the impact experiments of the four speeds of 500m/s, 600m/s, 800m/s and 1000m/s of the projectile speed recorded in the 0-degree impact experiment, and respectively finishing the impact experiments at the speeds.
And respectively observing whether the fuel tank is ignited or detonated after the shot is shot from the first target plate target center to the fifth target plate target center and is shot from the fifth target plate target center in the impact test at each speed, and recording related data.
The 60 ° impact test was completed. The fuel in the fuel tank is discharged and the inside of the fuel tank is ventilated and purged.
Iv 45 ° impact test.
The box body is rotated by 180 degrees, so that the box body rear wall plate of the box body faces the ballistic gun.
The 45-degree impact test comprises impact tests of four speeds of 500m/s projectile speed, 600m/s projectile speed, 800m/s projectile speed and 1000m/s projectile speed.
And (3) adding fuel into the box body and installing a safety pressure relief cover 17 according to the fuel adding amount of the first experiment control group determined in the step (2).
The fuel is heated. And heating the fuel in the box body 4 to 50 ℃ and keeping for 5-10 min, and simultaneously testing the concentration of the fuel vapor.
The shot was launched for the experiment. The specific process is as follows:
and taking the third target plate as an injection target and the second target plate as an injection target. And adjusting the shooting angle of the ballistic gun to enable a shooting line to pass through the geometric center of the third target plate and the geometric center of the second target plate to form a 45-degree shooting angle, so that shot is shot from the target center of the third target plate and shot from the target center of the second target plate.
And (5) launching the projectile. And sequentially repeating the processes of the impact experiments of the four speeds of 500m/s, 600m/s, 800m/s and 1000m/s of the projectile speed recorded in the 0-degree impact experiment, and respectively finishing the impact experiments at the speeds.
And respectively observing whether the fuel tank is ignited or detonated after the shot is shot from the first target plate target center to the fifth target plate target center and is shot from the fifth target plate target center in the impact test at each speed, and recording related data.
The 45 ° impact test was completed. The fuel in the fuel tank is discharged and the inside of the fuel tank is ventilated and purged.
And 4, carrying out experiment on a second experiment control group.
In the experiment of the second experiment control group, the fuel filling amount of the fuel tank is 20%; the unit of the fuel oil adding amount is volume fraction.
The box body is rotated by 180 degrees, so that the front wall surface of the box body faces the ballistic gun.
The experiments of the second experimental control group include a 0 ° impact experiment, a 30 ° impact experiment, a 60 ° impact experiment, and a 45 ° impact experiment.
And repeating the experimental process of the first experimental control group, and sequentially completing the 0-degree impact experiment, the 30-degree impact experiment and the 60-degree impact experiment of the second experimental control group. After the 0-degree impact test, the 30-degree impact test and the 60-degree impact test are completed, the box body is rotated by 180 degrees, so that the box body rear wall plate of the box body faces the ballistic gun. And repeating the experimental process of the first experimental control group to complete the 45-degree impact experiment of the second experimental control group.
In the experiment of the third experiment control group, the fuel filling amount of the fuel tank is 30%; the unit of the fuel oil adding amount is volume fraction.
The box body is rotated by 180 degrees, so that the front wall surface of the box body faces the ballistic gun.
And repeating the experimental process of the first experimental control group, and sequentially completing the 0-degree impact experiment, the 30-degree impact experiment and the 60-degree impact experiment of the third experimental control group. After the 0-degree impact test, the 30-degree impact test and the 60-degree impact test are completed, the box body is rotated by 180 degrees, so that the box body rear wall plate of the box body faces the ballistic gun. And repeating the experimental process of the first experimental control group to complete the 45-degree impact experiment of the third experimental control group.
And 6, performing experiment of a fourth experiment control group.
In the experiment of the fourth experiment control group, the fuel filling amount of the fuel tank is 40%; the unit of the fuel oil adding amount is volume fraction.
The box body is rotated by 180 degrees, so that the front wall surface of the box body faces the ballistic gun.
And repeating the experimental process of the first experimental control group, and sequentially completing the 0-degree impact experiment, the 30-degree impact experiment and the 60-degree impact experiment of the fourth experimental control group. After the 0-degree impact test, the 30-degree impact test and the 60-degree impact test are completed, the box body is rotated by 180 degrees, so that the box body rear wall plate of the box body faces the ballistic gun. And repeating the experimental process of the first experimental control group to complete the 45-degree impact experiment of the fourth experimental control group.
So far, the experiment of simulating the projectile multi-angle impact aircraft fuel tank is completed.
In this embodiment, the projectile is fired by a ballistic gun. The emission speed is controlled by the charge amount, and the experiment adopts the black-gathered explosive mixed by TNT, 8701 and hexogen. The corresponding relationship between the loading amount and the pill speed is as follows:
| medicine loading amount (g) | 7.3 | 8.8 | 11.2 | 14 |
| Speed of projectile (m/s) | 500 | 600 | 800 | 1000 |
Claims (8)
1. An experimental device for simulating a projectile multi-angle impact aircraft fuel tank is characterized by comprising a tank body, a target plate, an oil outlet valve, a safe pressure relief cover, a pressure sensor, a temperature sensor, a gas concentration tester and a constant temperature heating table; wherein the target plates comprise a first target plate, a second target plate, a third target plate, a fourth target plate and a fifth target plate; the box body is arranged on the upper surface of the constant-temperature heating table; the first target plate and the second target plate are respectively arranged on the outer surface of the front wall plate of the box body; the third target plate, the fourth target plate and the fifth target plate are respectively arranged on the outer surface of the rear wall plate of the box body; the safety pressure relief cover is arranged at the geometric center of the upper surface of the box body; an oil outlet is arranged at the lower part of a wall plate at one end of the box body; an oil outlet valve is arranged on the oil outlet; and recording the temperature, pressure change data and gas concentration value inside the experimental oil tank in real time through the pressure sensor, the temperature sensor and the gas concentration tester.
2. The experimental device for simulating the multi-angle impact of the projectile on the fuel tank of the aircraft as claimed in claim 1, wherein target plate mounting holes are formed in the front wall plate and the rear wall plate of the tank body respectively; sleeves are respectively fixed on the target plate mounting holes; the first target plate, the second target plate, the third target plate, the fourth target plate and the fifth target plate are respectively sleeved on the sleeves.
3. The experimental device for simulating the projectile multi-angle impact aircraft fuel tank as claimed in claim 1, wherein the center of each target plate mounting hole is located at a position 300 mm-400 mm of the height of the tank body, and the lower edge of each target plate mounting hole is located above the surface of the oil in the fuel tank, so that the oil is prevented from leaking from each target plate mounting hole.
4. The experimental device for simulating the fuel tank of the projectile multi-angle impact aircraft as claimed in claim 1, wherein the target plates are mounted such that the geometric centers of the target plates coincide with the centers of the target plate mounting holes; the mounting holes of the first target plate and the mounting holes of the third target plate are concentric.
5. The experimental device for simulating the fuel tank of the projectile multi-angle impact aircraft as claimed in claim 1, wherein the distance between the first target plate and the second target plate is equal to the width of the tank body; the centre distance between the third target plate and the fourth target plate is equal to the width of the box body
Doubling; the center distance between the third target plate and the fifth target plate is equal to the width of the box body
And (4) doubling.
6. The experimental device for simulating the multi-angle impact of the projectile on the fuel tank of the airplane as claimed in claim 2, wherein the two ends of the sleeve are respectively provided with an end plate, the end plate at one end of the sleeve is fixed on the box body, and a sealing rubber gasket is arranged between the surface of the box body and the surface of the end plate; the target plate is fixed on the outer surface of the end plate at the other end of the sleeve through a connecting bolt, and a sealing rubber gasket is arranged between the inner surface of the target plate and the surface of the end cover.
7. The experimental device for simulating a projectile multi-angle impact aircraft fuel tank as claimed in claim 1, wherein each target plate is made of aluminum alloy or magnesium aluminum alloy or composite material or stainless steel; the thickness of the target plate simulates the thickness of an oil tank, and is 1.5-5.0 mm according to different materials of the oil tank;
the safety pressure relief cover is made of rubber sheets with the thickness of 1-3 mm, the lower end of the safety pressure relief cover is sleeved and fixed on the sleeve 14, and the sleeve is fixed on a through hole in the geometric center of the upper cover of the box body.
8. An experimental method for simulating the fuel tank of the projectile multi-angle impact aircraft according to claim 1 is characterized by comprising the following specific steps:
step 1, determining the material and thickness of a target plate:
determining the material of the target plate; the determined material of the target plate is the same as that of the fuel tank of the airplane;
determining the thickness of the target plate: calculating the thickness h of the target plate by the formula (1)ci：
In the formula hciIs the thickness of the target plate; sigmabiThe ultimate strength of the material of the fuel tank of the airplane; sigmabciThe ultimate strength of the target plate material; rhoiIs the aircraft fuel tank material density; rhociIs the density of the target board material; h is the thickness of the fuel tank material of the airplane;
step 2, determining the fuel filling amount of the fuel tank in each experiment control group:
setting 4 experimental control groups which are respectively a first experimental control group, a second experimental control group, a third experimental control group and a fourth experimental control group according to different mission profiles of the combat aircraft; the determined fuel filling amount of the fuel tank in each experimental control group is respectively 10%, 20%, 30% and 40% in sequence; the unit of the fuel oil adding amount is volume fraction;
step 3, carrying out experiments of a first experiment control group;
the experiments of the first experiment control group comprise a 0-degree impact experiment, a 30-degree impact experiment, a 60-degree impact experiment and a 45-degree impact experiment;
i, performing 0-degree impact test;
the 0-degree impact experiment comprises impact experiments of four speeds of 500m/s projectile speed, 600m/s projectile speed, 800m/s projectile speed and 1000m/s projectile speed;
i, a 500m/s projectile velocity impact test;
adding fuel into the box body according to the fuel adding amount of the first experiment control group determined in the step 2; the safety pressure relief cover is installed and fixed after oil is added;
heating the fuel oil; heating the fuel in the box body to 50 ℃ and keeping for 5-10 min, and simultaneously testing the concentration of fuel vapor;
launching the projectile for experiment; the method comprises the following steps:
taking the first target plate as an injection target and taking the third target plate as an injection target; adjusting the shooting angle of a ballistic gun to enable a shooting line to be superposed with the geometric central line of the first target plate to form a 0-degree shooting angle, so that shot is shot from the target center of the first target plate and shot from the target center of the third target plate; setting the speed of the shot to be 500 m/s; launching the projectile; observing whether the fuel tank is ignited or detonated after the shot is shot from the first target plate target center to the third target plate target center, and recording related data;
completing an impact experiment of the projectile speed of 500 m/s;
ii, a shot velocity impact test at 600 m/s;
adjusting the shooting speed to 600 m/s; repeating the process of the impact experiment of the projectile velocity of 500m/s to complete the impact experiment of the projectile velocity of 600 m/s;
iii 800m/s projectile velocity impact test;
adjusting the shooting speed to 800 m/s; repeating the process of the impact experiment of the projectile velocity of 500m/s to complete the impact experiment of the projectile velocity of 800 m/s;
iv, a projectile velocity impact experiment at 1000 m/s;
adjusting the shooting speed to 1000 m/s; repeating the process of the impact experiment of the projectile velocity of 500m/s to complete the impact experiment of the projectile velocity of 1000 m/s;
so far, completing a 30-degree impact experiment; removing fuel in a fuel tank and ventilating and washing gas in the fuel tank;
so far, completing a 0-degree impact experiment; discharging fuel in a fuel tank and introducing air into the fuel tank to discharge waste gas;
II, impact test at 30 degrees;
the 30-degree impact experiment comprises impact experiments of four speeds of 500m/s projectile speed, 600m/s projectile speed, 800m/s projectile speed and 1000m/s projectile speed;
adding fuel into the box body and installing a safety pressure relief cover according to the fuel adding amount of the first experiment control group determined in the step 2;
heating the fuel oil; heating the fuel in the box body to 50 ℃ and keeping for 5-10 min, and simultaneously testing the concentration of fuel vapor; launching the projectile for experiment; the specific process is as follows:
taking the first target plate as an injection target and taking the fourth target plate as an injection target; adjusting the shooting angle of a ballistic gun to enable a shooting line to pass through the geometric center of the first target plate and the geometric center of the fourth target plate to form a 30-degree shooting angle, so that shot is shot from the target center of the first target plate and shot from the target center of the fourth target plate;
launching the projectile; sequentially repeating the processes of the impact experiments of the four speeds of 500m/s, 600m/s, 800m/s and 1000m/s of the projectile speed recorded in the 0-degree impact experiment, and respectively finishing the impact experiments at all the speeds;
respectively observing whether a fuel tank is ignited or detonated after the projectile is shot from the first target plate target center to the third target plate target center and is shot from the third target plate target center in the impact test at each speed, and recording related data;
completing a 30-degree impact experiment; removing fuel in a fuel tank and ventilating and washing gas in the fuel tank;
III 60-degree impact test;
the 60-degree impact experiment comprises impact experiments of four speeds of 500m/s projectile speed, 600m/s projectile speed, 800m/s projectile speed and 1000m/s projectile speed;
adding fuel into the box body and installing a safety pressure relief cover according to the fuel adding amount of the first experiment control group determined in the step 2;
heating the fuel oil; heating the fuel in the box body to 50 ℃ and keeping for 5-10 min, and simultaneously testing the concentration of fuel vapor; launching the projectile for experiment; the specific process is as follows:
taking the first target plate as an injection target and taking a fifth target plate as an injection target; adjusting the shooting angle of a ballistic gun to enable a shooting line to pass through the geometric center of the first target plate and the geometric center of the fifth target plate to form a 60-degree shooting angle, so that shot is shot from the target center of the first target plate and shot from the target center of the fifth target plate;
launching the projectile; sequentially repeating the processes of the impact experiments of the four speeds of 500m/s, 600m/s, 800m/s and 1000m/s of the projectile speed recorded in the 0-degree impact experiment, and respectively finishing the impact experiments at all the speeds;
respectively observing whether a fuel tank is ignited or detonated after the projectile is shot from the first target plate target center to the fifth target plate target center and then shot from the fifth target plate target center in the impact test at each speed, and recording related data;
completing a 60-degree impact experiment; removing fuel in a fuel tank and ventilating and washing gas in the fuel tank;
IV, impact test at 45 degrees;
rotating the box body by 180 degrees to enable a box body rear wall plate of the box body to face the ballistic gun;
the 45-degree impact experiment comprises impact experiments of four speeds of 500m/s projectile speed, 600m/s projectile speed, 800m/s projectile speed and 1000m/s projectile speed;
adding fuel into the box body and installing a safety pressure relief cover according to the fuel adding amount of the first experiment control group determined in the step 2;
heating the fuel oil; heating the fuel in the box body to 50 ℃ and keeping for 5-10 min, and simultaneously testing the concentration of fuel vapor;
launching the projectile for experiment; the specific process is as follows:
taking the third target plate as an injection target and the second target plate as an injection target; adjusting the shooting angle of the ballistic gun to enable a shooting line to pass through the geometric center of the third target plate and the geometric center of the second target plate to form a 45-degree shooting angle, so that shot is shot from the target center of the third target plate and shot from the target center of the second target plate;
launching the projectile; sequentially repeating the processes of the impact experiments of the four speeds of 500m/s, 600m/s, 800m/s and 1000m/s of the projectile speed recorded in the 0-degree impact experiment, and respectively finishing the impact experiments at all the speeds;
respectively observing whether a fuel tank is ignited or detonated after the projectile is shot from the first target plate target center to the fifth target plate target center and then shot from the fifth target plate target center in the impact test at each speed, and recording related data;
completing a 45-degree impact experiment; removing fuel in a fuel tank and ventilating and washing gas in the fuel tank;
step 4, performing experiments on a second experiment control group;
in the experiment of the second experiment control group, the fuel filling amount of the fuel tank is 20%; the unit of the fuel oil adding amount is volume fraction;
rotating the box body by 180 degrees to enable the front wall of the box body to face the ballistic gun;
the experiments of the second experiment control group comprise a 0-degree impact experiment, a 30-degree impact experiment, a 60-degree impact experiment and a 45-degree impact experiment;
repeating the experimental process of the first experimental control group, and sequentially completing a 0-degree impact experiment, a 30-degree impact experiment and a 60-degree impact experiment of a second experimental control group; after the 0-degree impact experiment, the 30-degree impact experiment and the 60-degree impact experiment are completed, rotating the box body by 180 degrees to enable the box body rear wall plate of the box body to face the ballistic gun; repeating the experiment process of the first experiment control group to complete the 45-degree impact experiment of the second experiment control group;
step 5, performing experiments of a third experiment control group;
in the experiment of the third experiment control group, the fuel filling amount of the fuel tank is 30%; the unit of the fuel oil adding amount is volume fraction;
rotating the box body by 180 degrees to enable the front wall of the box body to face the ballistic gun;
repeating the experimental process of the first experimental control group, and sequentially completing a 0-degree impact experiment, a 30-degree impact experiment and a 60-degree impact experiment of a third experimental control group; after the 0-degree impact experiment, the 30-degree impact experiment and the 60-degree impact experiment are completed, rotating the box body by 180 degrees to enable the box body rear wall plate of the box body to face the ballistic gun; repeating the experiment process of the first experiment control group to complete the 45-degree impact experiment of the third experiment control group;
step 6, experiment of a fourth experiment control group;
in the experiment of the fourth experiment control group, the fuel filling amount of the fuel tank is 40%; the unit of the fuel oil adding amount is volume fraction;
rotating the box body by 180 degrees to enable the front wall of the box body to face the ballistic gun;
repeating the experimental process of the first experimental control group, and sequentially completing a 0-degree impact experiment, a 30-degree impact experiment and a 60-degree impact experiment of a fourth experimental control group; after the 0-degree impact experiment, the 30-degree impact experiment and the 60-degree impact experiment are completed, rotating the box body by 180 degrees to enable the box body rear wall plate of the box body to face the ballistic gun; repeating the experiment process of the first experiment control group to complete the 45-degree impact experiment of the fourth experiment control group;
so far, the experiment of simulating the projectile multi-angle impact aircraft fuel tank is completed.
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