CN107037081B - Fuel tank ignition source verification test method - Google Patents
Fuel tank ignition source verification test method Download PDFInfo
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- CN107037081B CN107037081B CN201710205019.3A CN201710205019A CN107037081B CN 107037081 B CN107037081 B CN 107037081B CN 201710205019 A CN201710205019 A CN 201710205019A CN 107037081 B CN107037081 B CN 107037081B
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/50—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility
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Abstract
The invention relates to a fuel tank safety performance testing technology, in particular to a fuel tank ignition source verification testing method. The test method comprises the following steps: the method comprises the following steps of (1) sealing a sample assembly comprising a closed oil tank and a fuel pump in a main tank of the explosion test equipment; filling the main tank with explosion gas with preset concentration; heating the main tank to a first predetermined temperature; under the normal working state of the fuel pump, observing whether the fuel pump explodes or not and selecting the highest temperature point; introducing the explosion gas in the main box into the auxiliary box to verify whether the explosion gas is effective or not; and verifying whether the explosion gas explodes and selecting the highest temperature point under the idle running of the fuel pump, the sealing failure state of the motor leather cup and the clamping stagnation state of the motor impeller. The fuel tank ignition source verification test method provided by the invention can verify the protection tracing of the ignition source of the fuel tank of the airplane, meets the aviation requirement and lays a solid foundation for the aviation inspection of the airplane.
Description
Technical Field
The invention relates to a fuel tank safety performance testing technology, in particular to a fuel tank ignition source verification testing method.
Background
The ignition source protection design of the aircraft fuel tank system is one of the key technologies for ensuring the safety of the aircraft and obtaining evidence of airworthiness; therefore, the research on how to effectively prevent the fuel tank from exploding and ensure the safety of the transport aircraft is particularly important.
Disclosure of Invention
The invention aims to provide a fuel tank ignition source verification test method for verifying aircraft fuel tank ignition source protection tracing.
The technical scheme of the invention is as follows:
a fuel tank ignition source verification test method comprises the following steps:
step one, a sample assembly comprising a closed oil tank and a fuel pump is hermetically arranged in a main tank of an explosion test device;
secondly, filling explosion gas with preset concentration into a main tank of the explosion test equipment through a gas source;
step three, heating a main box of the explosion test equipment to ensure that the internal temperature of the main box reaches a first preset temperature and the internal and external temperature difference of the main box is less than a second preset temperature;
fourthly, under the normal working state of the fuel pump, controlling the connection and disconnection of the fuel pump according to a preset adjusting frequency in a preset time period, keeping the continuous connection of the fuel pump after the preset time period, and observing whether the fuel pump explodes or not; if the explosion happens, the test is finished; if the explosion does not occur, selecting the highest temperature point, and performing the fifth step;
fifthly, introducing the explosion gas in the main box into an auxiliary box for ignition, and observing whether the explosion gas explodes; if the explosion happens, the explosion gas is effective, and the test is effective; if the explosion does not occur, indicating that the explosion gas is invalid and the test is invalid;
step six, repeating the step two to the step three, keeping the fuel pump continuously connected in an idle state of the fuel pump, reaching a temperature stable state, and observing whether the fuel pump explodes or not; if the explosion happens, the test is finished; if the explosion does not occur, selecting the highest temperature point;
step seven, repeating the step three, keeping the fuel pump continuously connected under the state that the seal of the motor cup of the fuel pump fails, reaching the temperature stable state, and observing whether the fuel pump explodes or not; if the explosion happens, the test is finished; if the explosion does not occur, selecting the highest temperature point;
step eight, repeating the step three, keeping the continuous connection of the fuel pump under the clamping stagnation state of a motor impeller of the fuel pump, reaching a temperature stable state or a current protection automatic power-off state, and observing whether the fuel pump explodes or not; if the explosion happens, the test is finished; if there is no explosion, the highest temperature point is selected.
Optionally, the explosive gas is a mixed gas of propane and n-hexane.
Optionally, in the third step, the first predetermined temperature is 70 ℃, and the second predetermined temperature is 11 ℃.
Optionally, in the fourth step, the sixth step, the seventh step and the eighth step, the highest temperature point temperature is not greater than 240 ℃.
The invention has the following effects:
the fuel tank ignition source verification test method provided by the invention can verify the protection tracing of the ignition source of the fuel tank of the airplane, meets the aviation requirement and lays a solid foundation for the aviation inspection of the airplane.
Drawings
FIG. 1 is a schematic structural diagram of a verification device in the verification test method for the ignition source of the fuel tank.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
The method for verifying the ignition source of the fuel tank according to the present invention will be described in further detail with reference to fig. 1.
It should be noted that in the fuel tank ignition source verification test method of the present invention, the test equipment used may employ any of a variety of suitable known explosive atmosphere test equipment. In the present embodiment, as shown in fig. 1, the explosion atmosphere test apparatus includes a main tank 1, an auxiliary tank (not shown), a temperature sensor 2, a temperature display 3, and an air source (not shown); the main box 1 is mainly used for loading a sample assembly to be tested, can be sealed in the test process, and can heat the internal sample assembly to be tested according to the requirement; the sub-tank communicates with the main tank 1 and can be individually sealed for transferring the gas in the main tank 1 if necessary and performing a secondary test on the transferred gas. The temperature sensor 2 may be, for example, a temperature measuring patch, which is mainly disposed at a corresponding position on the sample assembly to measure the temperature. The temperature display 3 mainly displays the temperature of the fuel in the closed fuel tank 4. In addition, the gas source is in sealed communication with the main tank 1 for raising the explosive gas to the main tank 1.
The fuel tank ignition source verification test method provided by the invention can comprise the following steps of:
step one, the sample assembly is hermetically arranged in a main box 1 of the explosion testing equipment. Wherein the sample assembly is a device that may become a source of ignition, such as a sensor, annunciator, enclosed fuel tank 4, etc., in this embodiment, the sample assembly is a combination of enclosed fuel tank 4 and fuel pump 5. Of course, the sample assembly may further include a motor, and a regulating switch 6, a flow meter, a pressure gauge, etc. connected to the fuel pump 5 through a pipe and disposed outside the main tank 1. Further, the temperature sensor 2 is disposed at the bottom of the closed fuel tank 4, the housing, and the motor of the fuel pump 5.
And step two, filling the explosion gas with preset concentration into the main box 1 of the explosion test equipment through a gas source, and sealing the main box 1 and the auxiliary box relatively independently.
The composition and the predetermined concentration of the explosive gas can be properly selected according to the requirements; in this embodiment, the preferred explosive gas is a mixture of propane and n-hexane; wherein propane is a mixture of 3.85-4.25% by volume propane and 96.15-95.75% by volume air with a stoichiometric equivalent of 1.05. The n-hexane used was a mixture having a stoichiometric equivalent of 1.80, and the n-hexane content was calculated according to the following formula:
And step three, heating the main box 1 of the explosion test equipment to ensure that the internal temperature of the main box 1 reaches a first preset temperature and the internal and external temperature difference of the main box 1 is less than a second preset temperature (because the external heat dissipation is fast, the external temperature is lower than the internal temperature).
The first preset temperature is mainly used for preventing the condensation of the explosive gas, different explosive gases are different, and the temperature is different, and in the embodiment, the first preset temperature is preferably 70 ℃; in addition, it is preferable that the second predetermined temperature is 11 ℃, that is, the appearance is stabilized to 59 ℃.
Controlling the fuel pump 5 to normally work, controlling the connection and disconnection of the fuel pump 5 according to a preset adjusting frequency in a preset time period under the normal working state (equivalent to the state that oil exists in a closed oil tank) of the fuel pump 5, keeping the fuel pump 5 continuously connected after the preset time period, and observing whether the fuel pump explodes or not; if the explosion happens, the test is finished, and the sample assembly is an ignition source; if there is no explosion, the temperature peak is selected from the temperature display connected to the temperature sensor 2 and step five is performed. Wherein. The predetermined period of time is preferably 15 min.
Fifthly, introducing the explosion gas in the main box 1 into the auxiliary box, sealing and igniting to observe whether the explosion occurs; if explosion happens, the explosion gas is effective, and the test (verification in the fourth step) is effective, and the subsequent steps from six to eight are carried out; if there is no explosion, the explosion gas is invalid, and the test is invalid, at this time, the explosion gas needs to be readjusted to repeat the above steps.
Step six, repeating the step two to the step three, namely refilling the explosion gas with preset concentration into the main box 1 and heating; then, under the idle state (equivalent to the state without oil in a closed oil tank) of the fuel pump 5, keeping the continuous connection of the fuel pump 5, reaching the temperature stable state, and observing whether the fuel pump explodes or not; if so, the test ends (indicating that the sample assembly is the ignition source); if there is no explosion, the maximum temperature point is selected from a temperature display connected to the temperature sensor 2, and preferably the maximum temperature point temperature should be no greater than 240 ℃.
Step seven, repeating the step three, namely heating the main box 1 to the preset temperature; keeping the fuel pump 5 continuously connected under the state that the motor cup seal of the fuel pump 5 fails, reaching a temperature stable state, and observing whether the fuel pump explodes or not; if so, the test ends (indicating that the sample assembly is the ignition source); if there is no explosion, the maximum temperature point is selected from a temperature display connected to the temperature sensor 2, and preferably the maximum temperature point temperature is not more than 240 ℃.
Step eight, repeating the step three, namely heating the main box 1 to the preset temperature; then, under the clamping stagnation state of a motor impeller of the fuel pump 5, the fuel pump 5 is kept to be continuously connected, and a temperature stable state (equivalent to no current protection function) or a current protection automatic power-off state is achieved, and whether explosion occurs or not is observed; if so, the test ends (indicating that the sample assembly is the ignition source); if there is no explosion, the maximum temperature point is selected from a temperature display connected to the temperature sensor 2, and preferably the maximum temperature point temperature is not more than 240 ℃.
The fuel tank ignition source verification test method comprises the steps of firstly, determining a possible ignition source in a fuel tank according to the safety analysis of the fuel tank, making a corresponding test verification method according to relevant requirements of an explosion atmosphere test in DO-160F and the actual situation of an airplane, and respectively verifying that the maximum temperatures of the bottom, the shell and the motor of the closed fuel tank 4 are measured under normal working, idling and several possible fault states by analyzing and verifying that the fuel pump 5 is used as the possible ignition source in the closed fuel tank 4 so as to enable the maximum temperatures to meet the magnitude level of airworthiness requirements; meanwhile, the test environment is filled with combustible gas, and whether ignition sources such as sparks (explosion) and the like can appear in various states is verified. The test method can verify the protection tracing of the ignition source of the fuel tank of the airplane, meet the aviation requirement and lay a solid foundation for the aviation inspection of the airplane.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (4)
1. An explosion test device used in the method comprises a main tank, an auxiliary tank, a sample assembly comprising a closed oil tank and a fuel pump, a temperature sensor, a temperature display and an air source, and is characterized in that the method comprises the following steps:
step one, a sample assembly comprising a closed oil tank and a fuel pump is hermetically arranged in a main tank of an explosion test device;
secondly, filling explosion gas with preset concentration into a main box of the explosion test equipment through a gas source, and sealing the main box and an auxiliary box relatively independently at the moment;
step three, heating a main box of the explosion test equipment to ensure that the internal temperature of the main box reaches a first preset temperature and the internal and external temperature difference of the main box is less than a second preset temperature;
fourthly, under the normal working state of the fuel pump, controlling the connection and disconnection of the fuel pump according to a preset adjusting frequency in a preset time period, keeping the continuous connection of the fuel pump after the preset time period, and observing whether the fuel pump explodes or not; if the explosion happens, the test is finished; if the explosion does not occur, selecting the highest temperature point, and performing the fifth step;
fifthly, introducing the explosion gas in the main box into an auxiliary box, sealing and igniting to observe whether the explosion gas is exploded; if the explosion happens, the explosion gas is effective, and the test is effective; if the explosion does not occur, indicating that the explosion gas is invalid and the test is invalid;
step six, repeating the step two to the step three, keeping the fuel pump continuously connected in an idle state of the fuel pump, reaching a temperature stable state, and observing whether the fuel pump explodes or not; if the explosion happens, the test is finished; if the explosion does not occur, selecting the highest temperature point;
step seven, repeating the step three, keeping the fuel pump continuously connected under the state that the seal of the motor cup of the fuel pump fails, reaching the temperature stable state, and observing whether the fuel pump explodes or not; if the explosion happens, the test is finished; if the explosion does not occur, selecting the highest temperature point;
step eight, repeating the step three, keeping the continuous connection of the fuel pump under the clamping stagnation state of a motor impeller of the fuel pump, reaching a temperature stable state or a current protection automatic power-off state, and observing whether the fuel pump explodes or not; if the explosion happens, the test is finished; if there is no explosion, the highest temperature point is selected.
2. The method for verifying and testing the ignition source of the fuel tank as recited in claim 1, wherein the explosive gas is a mixture of propane and n-hexane.
3. The method for verifying an ignition source of a fuel tank as set forth in claim 1, wherein in said third step, said first predetermined temperature is 70 ℃ and said second predetermined temperature is 11 ℃.
4. The method for testing verification of the ignition source of a fuel tank as set forth in claim 1, wherein the maximum temperature point temperature in said steps four, six, seven and eight is not greater than 240 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710205019.3A CN107037081B (en) | 2017-03-30 | 2017-03-30 | Fuel tank ignition source verification test method |
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| CN201710205019.3A CN107037081B (en) | 2017-03-30 | 2017-03-30 | Fuel tank ignition source verification test method |
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| CN107037081B true CN107037081B (en) | 2020-05-22 |
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| CN114337060B (en) * | 2021-12-28 | 2023-07-21 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Aviation fuel pump driving motor based on safety design |
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