CN117682092A - Fire-retarding test bed of airborne flame suppressor and fire-retarding capability test method - Google Patents
Fire-retarding test bed of airborne flame suppressor and fire-retarding capability test method Download PDFInfo
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- CN117682092A CN117682092A CN202311578853.9A CN202311578853A CN117682092A CN 117682092 A CN117682092 A CN 117682092A CN 202311578853 A CN202311578853 A CN 202311578853A CN 117682092 A CN117682092 A CN 117682092A
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- 238000012360 testing method Methods 0.000 title claims abstract description 282
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- 229920006255 plastic film Polymers 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 20
- 208000025274 Lightning injury Diseases 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims description 32
- 239000003063 flame retardant Substances 0.000 claims description 24
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000979 retarding effect Effects 0.000 claims description 2
- 238000013022 venting Methods 0.000 claims 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 16
- 239000002828 fuel tank Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000012795 verification Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229920000573 polyethylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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Abstract
The embodiment of the invention discloses a fire-retarding test bed and a fire-retarding capability test method of an airborne flame suppressor, wherein a ventilation oil tank test device of the test bed comprises: the device comprises a test box, a flame suppressor in the test box, an oil tank vent, a discharge electrode, an igniter, a T1 thermocouple, a T2 thermocouple and a T3 thermocouple, wherein the plastic film adhered to the port of the oil tank vent is positioned outside the plastic film; the air source and the combustible gas source are respectively connected to the test box through the cut-off valve, combustible mixed gas is introduced into the test box, under the condition of lightning stroke environment generated by adopting the discharge electrode, the fire resistance capability test under the lightning stroke environment is carried out through the ventilation oil tank test device, the temperature of the corresponding position in the test box is monitored through the T1 thermocouple, the T2 thermocouple and the T3 thermocouple in the test process, and the combustible mixed gas in the test box is ignited through the igniter so as to verify.
Description
Technical Field
The application relates to the technical field of fire prevention verification of aircraft fuel tanks, in particular to a fire resistance test bed and a fire resistance capability test method of an airborne flame suppressor.
Background
An on-board flame arrester is a fire-retardant device mounted on an aircraft ventilation tank, which prevents fire sources outside the tank from entering the tank through a tank vent and subsequently causing a fire hazard.
When the aircraft flies in the air, the lightning stroke can ignite the combustible oil gas outside the air vent of the oil tank, and the flame suppressor needs to conduct fire-retarding capability test in the lightning stroke environment in advance before installation so as to ensure the operation safety of the aircraft. Currently, test equipment and a corresponding test method for testing the fire retarding capability of a flame arrester in a lightning stroke environment before installation are lacking.
Disclosure of Invention
The purpose of the invention is that: in order to solve the technical problems, the embodiment of the invention provides a fire-retarding test bed and a fire-retarding capability test method of an airborne flame suppressor, which are used for solving the problems of lack of test equipment and a corresponding test method for testing the fire-retarding capability of the flame suppressor in a lightning stroke environment before installation.
The technical scheme of the invention is as follows: the embodiment of the invention provides a fire-retarding test bed of an airborne flame suppressor, which comprises the following components: an air source 1, a combustible air source 5, a cut-off valve 9, a discharge electrode 20 and a ventilation oil tank test device;
wherein, the ventilation oil tank test device includes: a test chamber 10, a flame arrester 11 provided in the test chamber 10, a tank vent 12 connected to the flame arrester 11 from an opening position of a housing of the test chamber 10, a plastic film 14 attached to a port of the tank vent 12, a discharge electrode 20 provided outside the test chamber 10 and positioned outside the plastic film 14, and an igniter 13, a T1 thermocouple 17, a T2 thermocouple 18, and a T3 thermocouple 19 provided in the test chamber 10;
the air source 1 and the combustible gas source 5 are respectively connected to the test box 10 through the cut-off valve 9 and are used for introducing combustible mixed gas into the test box 10, under the condition that a lightning stroke environment is generated by adopting the discharge electrode 20 positioned outside the plastic film 14, a fire resistance capability test under the lightning stroke environment is carried out through the ventilation oil tank test device, the temperature of the corresponding position in the test box 10 is monitored through the T1 thermocouple 17, the T2 thermocouple 18 and the T3 thermocouple 19 in the test process, and the igniter 13 is used for igniting to verify the validity of the combustible mixed gas in the test box 10.
Alternatively, in a fire stopping test stand of an on-board flame arrester as described above,
the T2 thermocouple 18 is arranged in the test box 10 and is closely attached to the position of the oil tank vent 12 and is used for measuring the temperature of the position of the oil tank vent 12 so as to provide an indication of the temperature in the oil tank vent 12;
the T1 thermocouple 17 is arranged inside the test box 10 and is positioned at the center of the flame suppressor 11 and used for measuring the center temperature of the flame suppressor 11 so as to provide an indication of the center temperature of the flame suppressor 11;
the T3 thermocouple 19 is mounted inside the test chamber 10 for measuring the temperature within the test chamber 10 to provide an indication of the temperature within the test chamber 10.
Optionally, in the fire-blocking test stand of the on-board flame arrestor as described above, further comprising: a first flow rate regulating valve 2 and a second flow rate regulating valve 6;
a first flow regulating valve 2 is arranged between the air source 1 and the cut-off valve 9, and a second flow regulating valve 6 is arranged between the combustible air source 5 and the cut-off valve 9; during the process of introducing the combustible mixed gas into the test box 10 through the air source 1 and the combustible gas source 5, the mass ratio of hot air and the combustible gas in the combustible mixed gas is regulated through the first flow regulating valve 2 and the second flow regulating valve 6.
Optionally, in the fire-blocking test stand of the on-board flame arrestor as described above, further comprising: a first flowmeter 3, a first thermometer 4, a second flowmeter 7, and a second thermometer 8;
a first flowmeter 3 and a first thermometer 4 are sequentially arranged between the first flow regulating valve 2 and the cut-off valve 9, so that the flow rate of hot air flowing into the test box 10 is monitored through the first flowmeter 3, and the temperature of the hot air flowing into the test box 10 is monitored through the first thermometer 4;
a second flowmeter 7 and a second thermometer 8 are sequentially arranged between the second flow regulating valve 6 and the cut-off valve 9, so that the flow rate of the combustible gas flowing into the test box 10 is monitored through the second flowmeter 7, and the temperature of the combustible gas flowing into the test box 10 is monitored through the second thermometer 8.
Optionally, in the fire-blocking test stand of the on-board flame arrestor as described above, the ventilation oil tank test device further includes: an exhaust port 15;
the exhaust port 15 is arranged at the top of the test chamber 10, and is used for opening the exhaust port 15 in the process of introducing the combustible mixed gas into the test chamber 10 through the air source 1 and the combustible gas source 5, so that the original gas in the test chamber 10 filled with the combustible mixed gas in the test chamber 10 is replaced.
Optionally, in the fire-blocking test stand of the on-board flame arrestor as described above, the ventilation oil tank test device further includes: a pressure release port 16;
the pressure relief port 16 is provided on a side wall of the box body of the test box 10, and a pressure relief safety valve is installed on the pressure relief port 16.
Alternatively, in a fire stopping test stand of an on-board flame arrester as described above,
the fire-retarding test bed is used for introducing combustible mixed gas into the test box 10 through the air source 1 and the combustible gas source 5 and sealing the combustible mixed gas in the test box 10 through the plastic film 14; after the lightning strike environment is simulated by adopting the electrode discharge of the discharge electrode 20 and the plastic film 14 is ignited in the lightning strike environment, the temperature surge conditions of the T1 thermocouple 17, the T2 thermocouple 18 and the T3 thermocouple 19 are respectively monitored, and the igniter 13 is used for igniting in the test box 10, so that the result of the fire stopping capability test of the flame arrester 11 is judged according to the temperature surge conditions of the three thermocouples and the ignition conditions in the test box 10.
Optionally, in the flame retardant test stand of the on-board flame retardant device as described above, the manner of judging the result of the flame retardant capability test of the flame retardant device 11 is as follows:
test result 1, if the temperature monitored by the T2 thermocouple 18 increases suddenly and the temperature monitored by the T1 thermocouple 17 does not increase suddenly, the flame arrester 11 is tested to be effective when the igniter 13 ignites and ignites the combustible mixed gas in the test chamber 10;
test result 2, the test is invalid if the temperature monitored by the T2 thermocouple 18 increases suddenly and the temperature monitored by the T1 thermocouple 17 does not increase suddenly, the ignition is performed by the igniter 13, and the combustible mixed gas in the test chamber 10 is not ignited after a plurality of ignition attempts;
test result 3, if the temperature monitored by the T2 thermocouple 18 is increased abruptly and the temperature monitored by the T1 thermocouple 17 is increased abruptly, the test fails, and it is tested that the flame arrester 11 fails to block the flame.
The embodiment of the invention also provides a fire-retarding capability test method for the airborne flame suppressor, which is characterized by adopting the fire-retarding test bed for the airborne flame suppressor, and comprising the following steps:
step 1, hot air with preset temperature is introduced into a ventilation oil tank test device through an air source 1;
step 2, introducing combustible gas into the ventilation oil tank test device through a combustible gas source 5 so as to form combustible mixed gas after being mixed with hot air;
step 3, in the process of introducing the combustible mixed gas into the ventilation oil tank test device, opening the exhaust port 15, and controlling the combustible mixed gas to be a preset mass ratio by adjusting the first flow regulating valve 2 and the second flow regulating valve 6 until the test tank 10 is filled with the combustible mixed gas;
step 4, after the test chamber 10 is filled with the combustible mixed gas, closing the exhaust port 15 of the test chamber 10 and closing the cut-off valve 9 to cut off the combustible mixed gas;
step 5, electrode discharge is carried out by adopting a discharge electrode 20 at the center position right above the oil tank vent 12 so as to simulate lightning strike environment;
step 6, observing whether the plastic film 14 above the air port 12 of the oil tank ignites, if so, the temperature value monitored by the T2 thermocouple 18 is increased sharply, and the temperature of the T1 thermocouple 17 is monitored;
step 7, if the temperature of the T1 thermocouple 17 is monitored to be free from the surge, igniting the combustible mixed gas in the test chamber 10 through the igniter 13; if the combustible mixed gas in the test chamber 10 is not ignited after a plurality of ignition attempts, the test is invalid;
and 8, if the temperature of the T1 thermocouple 17 is monitored to be suddenly increased, the flame propagates into the test chamber 10, and the test fails.
Optionally, in the fire-retarding capability test method of the on-board flame suppressor as described above, the qualification criterion of the fire-retarding capability test method is that the ventilation oil tank test device simultaneously meets the following conditions:
in case 1, after ignition occurs in the region between the tank vent 12 and the plastic film 14, ignition does not occur in the region in the test chamber 10 blocked by the flame arrestor 11;
in case 2, the mixed gas in the test chamber 10 is ignited by the igniter 13 during the test, so that the mixed gas in the test chamber 10 is proved to have combustibility, and the test is qualified.
The invention has the beneficial effects that: according to the fire-retardant test bed and the fire-retardant capability test method of the airborne flame arrester, provided by the embodiment of the invention, under the condition that the test box 10 is filled with combustible mixed gas, the ventilation oil tank test device in the fire-retardant test bed can simulate a lightning stroke environment by adopting an external discharge electrode 20 through discharge, so that a plastic film 14 at the port position of the oil tank vent 12 is ignited, flame is arranged in the fuel tank vent 12, and under the condition that the flame is not transmitted into the test box 10 through the flame arrester 11, the combustible mixed gas in the test box 10 is ignited through an igniter 13 to verify that the test box 10 has the combustible environment, namely, the test is effective and the function of the flame arrester 11 is verified to be effective; the fire-retarding test bed provided by the embodiment of the invention can realize effective test and verification of the fire-retarding capability of the flame suppressor 11. The fire-retarding test bed provided by the embodiment of the invention is used for testing the fire-retarding capability, and can intuitively show the fire-retarding effect of the flame suppressor 11 by simulating the combustible gas mixture environment and lightning current characteristics of the ventilation oil tank and combining temperature monitoring and visual observation, and can be used for identifying the fire-retarding capability of the airborne flame suppressor.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.
Fig. 1 is a schematic structural diagram of a fire-retardant test stand of an airborne flame arrester according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.
The role and importance of the on-board flame arrestor has been described in the background above, and when an aircraft encounters a lightning strike, the flame arrestor should prevent a source of fire, which is generated by the lightning strike igniting oil gas outside the tank, from entering the tank through the tank vent, thereby avoiding the risk of fire. Before installation, fire-retarding capability test in lightning strike environment needs to be carried out in advance to ensure that the aircraft can be ensured to run safely.
Aiming at the lack of test equipment and a corresponding test method for testing the fire-retarding capability of the flame suppressor in the lightning stroke environment before installation of the flame suppressor, the embodiment of the invention provides a fire-retarding test bed and a fire-retarding capability test method of the airborne flame suppressor.
The following specific embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 1 is a schematic structural diagram of a fire-retardant test stand of an airborne flame arrester according to an embodiment of the present invention. As shown in fig. 1, a main structure of a fire-blocking test stand of an on-board flame suppressor according to an embodiment of the present invention may include: an air source 1, a combustible air source 5, a shut-off valve 9, a discharge electrode 20 and a ventilation oil tank test device.
In the structure of the fire-blocking test stand shown in fig. 1, the ventilation oil tank test device includes: the flame suppressor 11 is arranged in the test box 10, the fuel tank vent 12 is communicated with the flame suppressor 11 from the opening position of the shell of the test box 10, the plastic film 14 is adhered to the port of the fuel tank vent 12, the discharge electrode 20 is arranged outside the test box 10 and positioned outside the plastic film 14, and the igniter 13, the T1 thermocouple 17, the T2 thermocouple 18 and the T3 thermocouple 19 are arranged in the test box 10.
The air source 1 and the combustible air source 5 in the embodiment of the invention are respectively connected to the test box 10 through the cut-off valve 9 and are used for introducing combustible mixed gas into the test box 10, under the condition that a lightning stroke environment is generated by adopting the discharge electrode 20 positioned outside the plastic film 14, the fire resistance capability test under the lightning stroke environment is carried out through the ventilation oil tank test device, the temperature of the corresponding position of the test box 10 is monitored through the T1 thermocouple 17, the T2 thermocouple 18 and the T3 thermocouple 19 in the test process, and the igniter 13 is used for igniting to verify the validity of the combustible mixed gas in the test box 10.
Alternatively, the gas source 5 in the embodiment of the present invention may be, for example, an n-hexane source, and n-hexane gas may be introduced into the ventilation tank test device. In addition, the hot air introduced into the ventilation oil tank test device can be hot air at 74+/-5 ℃.
It should be noted that, in the embodiment of the present invention, the plastic film 14 disposed at the port of the vent 12 of the fuel tank may be, for example, a polyethylene film, so as to seal the combustible gas mixture in the test chamber 10; the plastic film 14 is adopted to adhere the end part of the air vent 12 of the oil tank, so that on one hand, the combustible gas can be sealed in the test box 10, on the other hand, the fuel can be quickly melted in a lightning stroke environment, the propagation of flame is not influenced, the test result is not influenced, and the test cost is greatly reduced.
In a specific implementation of the embodiment of the invention, the T2 thermocouple 18 is arranged in the test box 10 at a position close to the air port 12 of the oil tank and is used for measuring the temperature of the air port 12 of the oil tank so as to provide an indication of the temperature in the air port 12 of the oil tank;
a T1 thermocouple 17 is mounted inside the test chamber 10 and is centrally located within the flame arrester 11 for measuring the temperature of the center of the flame arrester 11 to provide an indication of the temperature of the center of the flame arrester 11;
a T3 thermocouple 19 is mounted in the interior of the test chamber 10 for measuring the temperature within the test chamber 10 to provide an indication of the temperature within the test chamber 10.
In one implementation of the embodiment of the present invention, as shown in fig. 1, the fire-blocking test stand further includes: a first flow regulating valve 2 and a second flow regulating valve 6.
In the implementation mode, a first flow regulating valve 2 is arranged between the air source 1 and the cut-off valve 9, and a second flow regulating valve 6 is arranged between the combustible air source 5 and the cut-off valve 9; during the process of introducing the combustible mixed gas into the test box 10 through the air source 1 and the combustible gas source 5, the mass ratio of hot air and the combustible gas in the combustible mixed gas is regulated through the first flow regulating valve 2 and the second flow regulating valve 6.
In the embodiment of the invention, the stoichiometric ratio of the combustible mixed gas (for example, the mixed gas of the n-hexane gas and the air) is controlled to be 1.15, namely, the mass ratio of the n-hexane gas to the air is 0.07567; the verification shows that the combustion reaction is most intense when the stoichiometric ratio of the combustible mixed gas is 1.15 and the mass ratio of the combustible gas to air is 0.07567.
In one implementation of the embodiment of the present invention, as shown in fig. 1, the fire-blocking test stand further includes: a first flowmeter 3, a first thermometer 4, a second flowmeter 7, and a second thermometer 8.
In this embodiment, a first flow meter 3 and a first thermometer 4 are provided in this order between the first flow rate adjusting valve 2 and the shut-off valve 9 to monitor the flow rate of the hot air introduced into the test chamber 10 by the first flow meter 3 and the temperature of the hot air introduced into the test chamber 10 by the first thermometer 4.
A second flowmeter 7 and a second thermometer 8 are sequentially arranged between the second flow regulating valve 6 and the cut-off valve 9 so as to monitor the flow of the combustible gas flowing into the test box 10 through the second flowmeter 7 and monitor the temperature of the combustible gas flowing into the test box 10 through the second thermometer 8.
In one implementation manner of the embodiment of the present invention, as shown in fig. 1, the ventilation oil tank test device further includes: and an exhaust port 15.
In this implementation, the exhaust port 15 is disposed at the top of the test chamber 10, and is used for opening the exhaust port 15 during the process of introducing the combustible mixed gas into the test chamber 10 through the air source 1 and the combustible gas source 5, so that the combustible mixed gas in the test chamber 10 is replaced by the original gas in the test chamber 10.
In one implementation manner of the embodiment of the present invention, as shown in fig. 1, the ventilation oil tank test device further includes: the pressure relief port 16.
In this implementation, the pressure relief port 16 is provided on a side wall of the box body of the test box 10, and a pressure relief safety valve is mounted on the pressure relief port 16.
Based on the structural form of the fire-retarding test stand and the functions of all the components, the working mode of the fire-retarding test stand is as follows: introducing a combustible mixed gas into the test box 10 through the air source 1 and the combustible gas source 5, and sealing the combustible mixed gas in the test box 10 through the plastic film 14; after the lightning strike environment is simulated by adopting the electrode discharge of the discharge electrode 20 and the plastic film 14 is ignited in the lightning strike environment, the temperature surge conditions of the T1 thermocouple 17, the T2 thermocouple 18 and the T3 thermocouple 19 are respectively monitored, and the igniter 13 is used for igniting in the test box 10, so that the result of the fire stopping capability test of the flame arrester 11 is judged according to the temperature surge conditions of the three thermocouples and the ignition conditions in the test box 10.
When the fire resistance test is performed by the fire resistance test stand, the exhaust port 15 is opened during the process of introducing the combustible mixed gas into the test chamber 10, the outlet of the original air in the test chamber 10 can be discharged, and when the total volume of the input combustible mixed gas is 5 times the volume of the test chamber 10, the exhaust port 15 is closed, and at this time, the original air is regarded as being replaced.
The volume of the mixture gas input into the test chamber 10 is calculated from the flow rate indication and the time of the flow meter, and when the volume is 5 times or more the volume of the test chamber, the mixture gas in the test chamber 10 is considered to be full.
When the lightning strike environment is simulated by the discharge electrode 20, the plastic film 14 is quickly melted during discharge, and the test result is not disturbed.
The mode of judging the result of the fire-retarding capability test of the flame suppressor 11 in the embodiment of the invention is as follows:
test result 1, if the temperature monitored by the T2 thermocouple 18 increases suddenly and the temperature monitored by the T1 thermocouple 17 does not increase suddenly, the flame arrester 11 is tested to be effective when the igniter 13 ignites and ignites the combustible mixed gas in the test chamber 10;
test result 2, the test is invalid if the temperature monitored by the T2 thermocouple 18 increases suddenly and the temperature monitored by the T1 thermocouple 17 does not increase suddenly, the ignition is performed by the igniter 13, and the combustible mixed gas in the test chamber 10 is not ignited after a plurality of ignition attempts;
test result 3, if the temperature monitored by the T2 thermocouple 18 is increased abruptly and the temperature monitored by the T1 thermocouple 17 is increased abruptly, the test fails, and it is tested that the flame arrester 11 fails to block the flame.
Based on the above-mentioned embodiment of the present invention to provide a fire-retardant test stand for an airborne flame arrester, the embodiment of the present invention provides a fire-retardant capability test method for an airborne flame arrester, which may be used for performing a fire-retardant capability test for an airborne flame arrester, the fire-retardant capability test method includes the following steps:
step 1, hot air with preset temperature is introduced into the ventilation oil tank test device through the air source 1, wherein, for example, the hot air introduced into the ventilation oil tank test device can be 74+/-5 ℃.
Step 2, introducing combustible gas into the ventilation oil tank test device through a combustible gas source 5 so as to form combustible mixed gas after being mixed with hot air;
in this step, the combustible gas source 5 may be, for example, n-hexane source, and n-hexane gas may be introduced into the ventilation tank test device.
Step 3, in the process of introducing the combustible mixed gas into the ventilation oil tank test device, controlling the stoichiometric ratio of the combustible mixed gas (for example, the mixed gas of n-hexane gas and air) to be 1.15 (the mass ratio of the n-hexane gas to the air is 0.07567) by adjusting the first flow regulating valve 2 and the second flow regulating valve 6 until the test tank 10 is filled with the combustible mixed gas; in the step 3, the exhaust port 15 of the test chamber 10 is opened in the inflation process so as to ensure that the original gas in the test chamber 10 is replaced by the inflated mixed gas;
it was confirmed that the combustion reaction was most intense when the stoichiometric ratio of the combustible mixed gas was 1.15 and the mass ratio of the combustible gas to air was 0.07567.
Step 4, after the test chamber 10 is filled with the combustible mixed gas, closing the exhaust port 15 of the test chamber 10 and closing the cut-off valve 9 to cut off the combustible mixed gas;
step 5, electrode discharge is carried out by adopting a discharge electrode 20 at the center position right above the oil tank vent 12 so as to simulate lightning strike environment;
step 6, visually observing whether the plastic film 14 above the air vent 12 of the oil tank ignites, namely whether the area A in the air vent 12 of the oil tank ignites, if so, the temperature value monitored by the T2 thermocouple 18 is increased sharply, and the temperature of the T1 thermocouple 17 is monitored;
step 7, if the temperature of the T1 thermocouple 17 is monitored to be free from the surge, the flame is not transmitted to the zone B in the test chamber 10 through the flame suppressor 11; the combustible mixed gas in zone B is then ignited by the igniter 13 to verify the combustibility of the combustible mixed gas.
In this step, if the combustible mixed gas in zone B is not ignited, waiting for two minutes, and then repeatedly igniting the combustible mixed gas in zone B by the igniter 13; after 5 attempts, the test was not effective if the igniter 13 could not ignite the combustible mixture in zone B.
And 8, if the temperature recorded by the T1 thermocouple 17 is suddenly increased, the flame propagates to the zone B, and the test fails.
The function of the flame arrester 11 is to block the flame in the tank vent 12 from entering the test chamber 10, i.e., to block the flame from entering the zone B, and if so, to indicate that the function of the flame arrester 11 is disabled.
The criterion of test qualification of the fire-retarding capacity test method of the flame-carrying inhibitor provided by the embodiment of the invention is that the ventilation oil tank test device simultaneously meets the following conditions:
(1) After ignition occurs in the area (i.e., area a) between the tank vent 12 and the plastic film 14, ignition does not occur in area B in the test chamber 10 blocked by the flame arrestor 11;
(2) The inflammable mixed gas in the test chamber 10 is ignited by the igniter 13 in the test process, so that the mixed gas in the test chamber 10 is proved to have inflammability, namely, the test is considered to be qualified, and the flame suppressor 11 is verified to be capable of effectively stopping the fire.
According to the flame retardant test bed and the flame retardant capability test method of the airborne flame arrester, provided by the embodiment of the invention, under the condition that the test box 10 is filled with combustible mixed gas, the ventilation oil tank test device in the flame retardant test bed can simulate a lightning stroke environment through discharge by adopting the external discharge electrode 20, so that the plastic film 14 at the port position of the oil tank vent 12 is ignited, flame is arranged in the fuel tank vent 12, and under the condition that the flame is not transmitted into the test box 10 through the flame arrester 11, the combustible mixed gas in the test box 10 is ignited through the igniter 13 to verify that the test box 10 has the combustible environment, namely, the test is effective and the function of the flame arrester 11 is verified to be effective; the fire-retarding test bed provided by the embodiment of the invention can realize effective test and verification of the fire-retarding capability of the flame suppressor 11. The fire-retarding test bed provided by the embodiment of the invention is used for testing the fire-retarding capability, and can intuitively show the fire-retarding effect of the flame suppressor 11 by simulating the combustible gas mixture environment and lightning current characteristics of the ventilation oil tank and combining temperature monitoring and visual observation, and can be used for identifying the fire-retarding capability of the airborne flame suppressor.
Although the embodiments of the present invention are described above, the present invention is not limited to the embodiments which are used for understanding the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.
Claims (10)
1. A fire stopping test stand for an on-board flame arrestor, comprising: an air source (1), a combustible air source (5), a cut-off valve (9), a discharge electrode (20) and a ventilation oil tank test device;
wherein, the ventilation oil tank test device includes: the flame suppressor comprises a test box (10), a flame suppressor (11) arranged in the test box (10), a tank vent (12) communicated with the flame suppressor (11) from the opening position of a shell of the test box (10), a plastic film (14) adhered to a port of the tank vent (12), a discharge electrode (20) arranged outside the test box (10) and positioned outside the plastic film (14), and an igniter (13), a T1 thermocouple (17), a T2 thermocouple (18) and a T3 thermocouple (19) arranged in the test box (10);
the air source (1) and the combustible gas source (5) are respectively connected to the test box (10) through the cut-off valve (9) and are used for introducing combustible mixed gas into the test box (10), under the condition that a lightning stroke environment is generated by adopting the discharge electrode (20) positioned on the outer side of the plastic film (14), the fire-retarding capability test under the lightning stroke environment is carried out through the ventilation oil tank test device, the temperature of the corresponding position of the test box (10) is monitored through the T1 thermocouple (17), the T2 thermocouple (18) and the T3 thermocouple (19) in the test process, and the igniter (13) is used for igniting to verify the validity of the combustible mixed gas in the test box (10).
2. The flame retardant test stand of an on-board flame arrester of claim 1, wherein,
the T2 thermocouple (18) is arranged in the test box (10) and is closely attached to the position of the oil tank vent (12) and used for measuring the temperature of the position of the oil tank vent (12) so as to provide an indication of the temperature in the oil tank vent (12);
the T1 thermocouple (17) is arranged inside the test box (10) and is positioned at the center of the flame suppressor (11) and used for measuring the center temperature of the flame suppressor (11) so as to provide an indication of the center temperature of the flame suppressor (11);
the T3 thermocouple (19) is arranged inside the test chamber (10) and is used for measuring the temperature in the test chamber (10) so as to provide an indication of the temperature in the test chamber (10).
3. The flame retardant test stand of an on-board flame arrester of claim 2, further comprising: a first flow rate regulating valve (2) and a second flow rate regulating valve (6);
a first flow regulating valve (2) is arranged between the air source (1) and the cut-off valve (9), and a second flow regulating valve (6) is arranged between the combustible air source (5) and the cut-off valve (9); in the process of introducing the combustible mixed gas into the test box (10) through the air source (1) and the combustible gas source (5), the mass ratio of the hot air and the combustible gas in the combustible mixed gas is regulated through the first flow regulating valve (2) and the second flow regulating valve (6).
4. A fire stopping test stand for an on-board flame arrester as defined in claim 3, further comprising: a first flowmeter (3), a first thermometer (4), a second flowmeter (7) and a second thermometer (8);
a first flowmeter (3) and a first thermometer (4) are sequentially arranged between the first flow regulating valve (2) and the cut-off valve (9) so as to monitor the flow of hot air flowing into the test box (10) through the first flowmeter (3) and monitor the temperature of the hot air flowing into the test box (10) through the first thermometer (4);
a second flowmeter (7) and a second thermometer (8) are sequentially arranged between the second flow regulating valve (6) and the cut-off valve (9) so as to monitor the flow of the combustible gas flowing into the test box (10) through the second flowmeter (7) and monitor the temperature of the combustible gas flowing into the test box (10) through the second thermometer (8).
5. The flame retardant test stand of an on-board flame arrester of claim 4, wherein the vented oil tank test apparatus further comprises: an exhaust port (15);
the exhaust port (15) is arranged at the top of the test box (10) and is used for opening the exhaust port (15) in the process of introducing the combustible mixed gas into the test box (10) through the air source (1) and the combustible gas source (5) so as to replace the original gas in the test box (10) filled with the combustible mixed gas in the test box (10).
6. The flame retardant test stand of an on-board flame arrester of claim 5, wherein the vented oil tank test apparatus further comprises: a pressure release port (16);
the pressure release port (16) is arranged on the side wall of the box body of the test box (10), and a pressure release safety valve is arranged on the pressure release port (16).
7. The flame retardant test stand of an on-board flame arrester of claim 6, wherein,
the fire-retarding test bed is used for introducing combustible mixed gas into the test box (10) through the air source (1) and the combustible air source (5), and sealing the combustible mixed gas in the test box (10) through the plastic film (14); after the lightning strike environment is simulated by adopting the electrode discharge of the discharge electrode (20), and the plastic film (14) is ignited in the lightning strike environment, the temperature surge conditions of the T1 thermocouple (17), the T2 thermocouple (18) and the T3 thermocouple (19) are respectively monitored, and the igniter (13) is used for igniting in the test box (10), so that the result of the fire retarding capability test of the flame suppressor (11) is judged according to the temperature surge conditions of the three thermocouples and the ignition conditions in the test box (10).
8. The flame retardant test stand of an on-board flame arrester of claim 7 wherein the means for determining the result of the flame arrester (11) flame retardant capability test is:
test result 1, if the temperature monitored by the T2 thermocouple (18) is suddenly increased and the temperature monitored by the T1 thermocouple (17) is not suddenly increased, the flame suppressor (11) is tested to be effective under the conditions that the igniter (13) ignites and the combustible mixed gas in the test box (10) is ignited;
test result 2, if the temperature monitored by the T2 thermocouple (18) is suddenly increased and the temperature monitored by the T1 thermocouple (17) is not suddenly increased, the test is invalid under the conditions that the igniter (13) is used for ignition and the combustible mixed gas in the test box (10) is not ignited after multiple ignition attempts;
test result 3, if the temperature monitored by the T2 thermocouple (18) is increased suddenly and the temperature monitored by the T1 thermocouple (17) is increased suddenly, the test fails, and the flame suppressor (11) fails to block the flame.
9. A fire stopping capability test method of an on-board flame arrester, characterized in that the fire stopping capability test method of the on-board flame arrester is performed by using the fire stopping test bed of the on-board flame arrester according to any one of claims 1 to 8, the method comprising:
step 1, hot air with preset temperature is introduced into a ventilation oil tank test device through an air source (1);
step 2, introducing combustible gas into the ventilation oil tank test device through a combustible gas source (5) so as to form combustible mixed gas after mixing with hot air;
step 3, in the process of introducing the combustible mixed gas into the ventilation oil tank test device, opening an exhaust port (15), and controlling the combustible mixed gas to be a preset mass ratio by adjusting a first flow regulating valve (2) and a second flow regulating valve (6) until the test box (10) is filled with the combustible mixed gas;
step 4, after the test box (10) is filled with the combustible mixed gas, closing an exhaust port (15) of the test box (10) and closing a cut-off valve (9) to cut off the combustible mixed gas;
step 5, electrode discharge is carried out by adopting a discharge electrode (20) at the center position right above the oil tank vent (12) so as to simulate lightning stroke environment;
step 6, observing whether the plastic film (14) above the oil tank vent (12) ignites, if so, the temperature value monitored by the T2 thermocouple (18) is increased sharply, and the temperature of the T1 thermocouple (17) is monitored;
step 7, igniting the combustible mixed gas in the test box (10) through the igniter (13) if the temperature of the T1 thermocouple (17) is monitored to be free from the surge; if the flammable mixed gas in the test box (10) is not ignited after a plurality of ignition attempts, the test is invalid;
and 8, if the temperature of the T1 thermocouple (17) is monitored to be suddenly increased, the flame propagates into the test chamber (10), and the test fails.
10. The method for testing the fire stopping ability of an on-board flame arrester of claim 9, wherein the qualification criterion of the fire stopping ability testing method is that the venting oil tank testing device simultaneously meets the following conditions:
in case 1, after ignition occurs in the area between the tank vent (12) and the plastic film (14), ignition does not occur in the area in the test chamber (10) blocked by the flame suppressor (11);
and 2, igniting the combustible mixed gas in the test box (10) through an igniter (13) in the test process, and proving that the mixed gas in the test box (10) has combustibility and the test is qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311578853.9A CN117682092A (en) | 2023-11-23 | 2023-11-23 | Fire-retarding test bed of airborne flame suppressor and fire-retarding capability test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311578853.9A CN117682092A (en) | 2023-11-23 | 2023-11-23 | Fire-retarding test bed of airborne flame suppressor and fire-retarding capability test method |
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| Publication Number | Publication Date |
|---|---|
| CN117682092A true CN117682092A (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311578853.9A Pending CN117682092A (en) | 2023-11-23 | 2023-11-23 | Fire-retarding test bed of airborne flame suppressor and fire-retarding capability test method |
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| Country | Link |
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| CN (1) | CN117682092A (en) |
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- 2023-11-23 CN CN202311578853.9A patent/CN117682092A/en active Pending
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