CN110596187B - Experiment table for simulating vehicle hot surface ignition oil product - Google Patents
Experiment table for simulating vehicle hot surface ignition oil product Download PDFInfo
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- CN110596187B CN110596187B CN201910823763.9A CN201910823763A CN110596187B CN 110596187 B CN110596187 B CN 110596187B CN 201910823763 A CN201910823763 A CN 201910823763A CN 110596187 B CN110596187 B CN 110596187B
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- 238000002474 experimental method Methods 0.000 title abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 238000004321 preservation Methods 0.000 claims abstract description 40
- 239000008236 heating water Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000002485 combustion reaction Methods 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 50
- 239000007788 liquid Substances 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 5
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 9
- 239000003054 catalyst Substances 0.000 description 34
- 238000000034 method Methods 0.000 description 17
- 239000003570 air Substances 0.000 description 6
- 238000011835 investigation Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000013401 experimental design Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013383 initial experiment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
- G01B5/061—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness height gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Fluid Mechanics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Aviation & Aerospace Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention relates to a test bed for simulating ignition oil on the hot surface of a vehicle, which is used for simulating the phenomenon that the high-temperature hot surface of the vehicle ignites gasoline due to braking after the vehicle runs for a long time, and mainly solves the problem that the ignition condition and the combustion process of the existing fire disaster on the hot surface of the vehicle are difficult to judge. The experiment table comprises a lifting heating assembly, a water tank heat preservation assembly, a wind control assembly and an electric control assembly; the lifting heating assembly comprises a heating device, a supporting frame, a base installation frame and a lifting adjusting device, wherein the heating device is arranged on the supporting frame, the supporting frame is connected with the lifting adjusting device, and the lifting adjusting device is arranged on the base installation frame; the water tank heat preservation assembly comprises a heating water tank and a heat preservation cover; the heat preservation cover is arranged above the device to be tested, and the heating water tank is communicated with the heat preservation cover; the wind control assembly comprises a fan and a wind speed regulator; the fan is arranged at one side of the device to be tested; the electric control assembly is respectively connected with the liftable heating assembly, the water tank heat preservation assembly and the wind control assembly.
Description
Technical Field
The invention relates to a heating experiment table, in particular to an experiment table for simulating a vehicle hot surface ignition oil product, which is used for simulating the phenomenon that the vehicle generates high-temperature hot surface ignition gasoline due to braking after long-time running.
Background
With the continuous improvement of living standard, the popularity of automobiles is increasing year by year, the automobiles become indispensable transportation means for traveling, the safety of the automobiles in the traveling process becomes the focus of people, and the automobile fire disaster is one of the key problems in the aspect of automobile safety. Automobile fires can bring serious harm to the life and property safety of people. It is counted that more than 80% of car fires can cause the rejection of vehicles, even the destruction of vehicles and the death of people, and 66% of car fires occur near the engine compartment.
When the vehicle is braked and extinguished, the exhaust manifold is gradually cooled, and after the vehicle is extinguished, the three-way catalyst suddenly worsens due to the heat dissipation condition, the temperature of the hot surface of the three-way catalyst rises, and leaked oil steam gathers on the hot surface to form premixed combustible gas, so that the three-way catalyst has the ignition condition and further fires. The hot surface is the most difficult ignition source to identify, because the oil product leaked in the process is easy to evaporate on the high-temperature surface, and the obvious combustion characteristic is not easy to remain after the oil product is combusted under the condition of self-ignition, and the judgment evidence for supporting the ignition condition is difficult to find after the oil product is combusted in the subsequent whole combustion of the vehicle.
At present, although research is carried out on the ignition oil product on the hot surface, the real working condition of the vehicle running and braking is not simulated, related research is not carried out on the real working condition of the vehicle by combining a three-way catalyst, and a laboratory table is not built on the phenomenon of the ignition oil product on the hot surface of the three-way catalyst of the vehicle, so that the occurrence of the fire disaster of the vehicle cannot be simulated.
Disclosure of Invention
The invention aims to solve the problem that the ignition condition and the combustion process of the existing automobile hot surface fire are difficult to judge, and provides a test bed for simulating the automobile hot surface ignition oil product, which is used for simulating the occurrence of the automobile fire.
The technical scheme of the invention is as follows:
the experiment table for simulating the ignition oil product on the hot surface of the vehicle comprises a liftable heating assembly, a water tank heat preservation assembly, a wind control assembly and an electric control assembly; the lifting heating assembly comprises a heating device, a supporting frame, a base installation frame and a lifting adjusting device, wherein the heating device is arranged on the supporting frame and used for installing a device to be tested, the supporting frame is connected with the lifting adjusting device, and the lifting adjusting device is arranged on the base installation frame and used for adjusting the height of the supporting frame; the water tank heat preservation assembly comprises a heating water tank and a heat preservation cover; the heat preservation cover is arranged above the device to be tested, an injection hole is formed in the heat preservation cover, and the heating water tank is communicated with the heat preservation cover and used for providing a heat source for the heat preservation cover; the wind control assembly comprises a fan and a wind speed regulator; the wind speed regulator is connected with the wind blower and used for regulating the wind speed of the wind blower; the electric control assembly is respectively connected with the lifting heating assembly, the water tank heat preservation assembly and the wind control assembly and is used for controlling the fan and the wind speed regulator and for adjusting the temperature of the heating water tank and the heating device.
Further, the wind control assembly further comprises a wind meter which is arranged on the supporting frame and used for measuring the wind speed of the wind flowing through the hot surface of the heating device.
Further, the lifting adjusting device comprises a gear, a rack and a shaking handle; the shaking handle is connected with the gear and used for driving the gear to rotate, the rack is fixedly connected with the support frame, and the gear is meshed with the rack, so that the support frame can be adjusted in height up and down.
Further, a graduated scale for displaying the height of the support frame is arranged on the base installation frame, and a pointer for pointing to the graduated scale is arranged on the rack.
Further, the heating device is a silicon molybdenum rod heating table.
Further, the water tank heat preservation assembly further comprises a funnel, a valve and a liquid level indicator; the funnel is communicated with the heating water tank and is used for injecting water into the heating water tank, the valve is arranged on a pipeline of the funnel communicated with the heating water tank and is used for controlling water injection quantity, and the liquid level indicator is communicated with the heat preservation cover and is used for displaying the water level of the heat preservation cover.
Further, the water tank heat preservation assembly further comprises an overflow tank, the overflow tank is communicated with the heating water tank, and a water draining hole is formed in the bottoms of the overflow tank and the heating water tank.
Further, a temperature sensor is arranged on the supporting frame and used for measuring the temperature of the surface of the heating device.
Further, a temperature sensor is installed on the heating water tank and is used for measuring the temperature of the liquid in the heating water tank.
Further, a scale plate vertical to the horizontal plane of the device to be tested is arranged behind the heating device, and transverse scales and longitudinal scales are marked on the scale plate and used for measuring the positions and flame heights of cold flame and open flame in the gasoline combustion process.
Compared with the prior art, the invention has the following beneficial effects:
1. the experiment table simulates heat generated in the running process of the vehicle through the heating device, the wind control assembly simulates the running speed of the vehicle, the top heat preservation cover simulates the top air residual temperature of the three-way catalyst after the vehicle stops, and the experiment table can be used for researching the time and the phenomenon that different oil products and different oil leakage amounts on the surface of the three-way catalyst ignite after the vehicle runs under various running conditions, so that the experiment table has reference and guiding significance for the fire investigation of the vehicle.
2. The heating device of the experiment table is arranged to be liftable, so that the distance between the heating device and the device to be tested is adjustable, the heating device can be used for simulating the waste heat of the three-way catalyst and surrounding devices after different running states of the vehicle, the farther the distance is, the smaller the radiant heat is, the lower the heated temperature of the three-way catalyst is, and the fact that the heat generation of the vehicle before running is less is proved.
3. According to the invention, the experiment table is used for testing different oil products, so that the characteristics of ignition temperature, ignition time and the like of different oil products under the conditions of specific wind speed and specific oil leakage can be obtained, and the method has guiding significance for daily vehicle safety design. Meanwhile, the characteristics of ignition time, phenomenon and the like of different oil leakage amounts of the same oil product at a specific temperature and a specific wind speed can be analyzed. In addition, the ignition time and the ignition process of different oil leakage amounts of the same oil product at a specific wind speed can be analyzed.
4. The top heat-insulating cover of the experiment table is used for simulating the residual temperature of the three-way catalyst after the vehicle is braked, and the ambient air temperature of the three-way catalyst after the vehicle is suddenly stopped is measured to be 80-100 ℃. In addition, the heating water tank is communicated with the overflow tank, water can flow to the overflow tank through the pipeline after boiling, surrounding circuits are not affected, and safety is high.
Drawings
FIG. 1 is a schematic diagram of a test bench for simulating a vehicle hot surface ignition oil product according to the present invention;
FIG. 2 is a schematic diagram II of a test bench for simulating a vehicle hot surface ignition oil product according to the present invention;
FIG. 3 is a schematic diagram of the lift adjusting device in the experiment table for simulating the hot surface ignition oil product of the vehicle.
Reference numerals: the device comprises a 1-liftable heating component, a 2-water tank heat preservation component, a 3-air control component, a 4-electric control component, a 5-device to be tested, a 6-injector, a 11-heating device, a 12-support frame, a 13-base mounting frame, a 14-lifting adjusting device, a 15-graduated scale, a 16-pointer, a 17-graduated plate, a 141-gear, a 142-rack, a 143-shaking handle, a 21-heating water tank, a 22-heat preservation cover, a 23-injection hole, a 24-funnel, a 25-valve, a 26-liquid level indicator, a 27-overflow box, a 28-drain hole, a 31-fan, a 32-air speed regulator, a 33-anemometer, a 41-equipment main switch, a 42-fan switch, a 43-heater switch and a 44-water tank heating switch.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the running process of the automobile, leaked oil products cannot burn, but the automobile can have spontaneous combustion fire within a few minutes after the automobile is stopped, and the investigation of the fire is very difficult. The investigation difficulty is mainly concentrated on supporting ignition sources and initial combustibles without material evidence, and comprehensive analysis and judgment can be carried out only by analyzing the running state before parking, the running condition after parking and the ignition time after parking. The invention provides a test bed for simulating a vehicle hot surface ignition oil product from the theoretical research point of view, which is used for simulating a fire disaster caused by the sudden deterioration of a heat dissipation condition and the rising of a hot surface temperature of an automobile three-way catalyst, so as to analyze the ignition condition and the combustion process generated by the fire disaster and provide a certain theoretical basis for the fire disaster. The experiment table simulates heat generated in the running process of the vehicle through the heating device, the wind control assembly simulates the running speed of the vehicle, the top heat preservation cover simulates the top air residual temperature of the three-way catalyst after the vehicle stops, and the experiment table can be used for researching the ignition time and phenomena of different oil products and different oil leakage amounts on the surface of the three-way catalyst after the vehicle runs under various running conditions, so that the experiment table has reference and guiding significance for the fire investigation of the vehicle.
As shown in fig. 1 to 3, the experiment table for simulating the ignition oil product on the hot surface of the vehicle provided by the invention comprises a liftable heating assembly 1, a water tank heat preservation assembly 2, a wind control assembly 3 and an electric control assembly 4.
The liftable heating assembly 1 comprises a heating device 11, a supporting frame 12, a foundation installation frame 13 and a lifting adjusting device 14, wherein the heating device 11 is arranged on the supporting frame 12 and is used for installing a device to be tested 5 (namely a three-way catalyst), and a silicon-molybdenum rod heating table can be adopted specifically. The supporting frame 12 is connected with a lifting adjusting device 14, and the lifting adjusting device 14 is arranged on the base mounting frame 13 and is used for adjusting the height of the supporting frame 12; the elevation adjustment apparatus 14 includes a gear 141, a rack 142, and a swing handle 143; the swing handle 143 is connected with the gear 141 for driving the gear 141 to rotate, the rack 142 is fixedly connected with the support frame 12, and the gear 141 and the rack 142 are engaged, so that the support frame 12 can be adjusted in height up and down. The base mounting frame 13 is provided with a graduated scale 15 for displaying the height of the support frame 12, and the rack 142 is provided with a pointer 16 for pointing to the graduated scale 15. The heating device 11 displays the moving distance through the graduated scale 15 with graduations, the graduations are 0 to 40cm, the top of the graduated scale 15 is 0 graduation, and the heating device 11 can be completely contacted with the surface of the three-way catalyst when moving to the 0 graduation.
The water tank heat preservation assembly 2 comprises a heating water tank 21, a heat preservation cover 22, a funnel 24, an overflow tank 27, a valve 25 and a liquid level indicator 26; the heat-preserving cover 22 is arranged above the device 5 to be tested, an injection hole 23 is arranged on the heat-preserving cover, and the heating water tank 21 is communicated with the heat-preserving cover 22 and is used for providing a heat source for the heat-preserving cover 22; the funnel 24 is communicated with the heating water tank 21 and is used for filling water into the heating water tank 21, the valve 25 is arranged on a pipeline of the funnel 24 communicated with the heating water tank 21 and is used for controlling water filling quantity, and the liquid level indicator 26 is communicated with the heat preservation cover 22 and is used for displaying the water level of the heat preservation cover 22. The overflow tank 27 is communicated with the heating water tank 21, and water can flow to the overflow tank through a pipeline after boiling, so that the surrounding circuit is not affected, and the safety is high. A temperature sensor is installed on the heating water tank 21 for measuring the temperature of the heating water tank 21 so that the temperature of the surface of the three-way catalyst can be adjusted.
The wind control assembly 3 comprises a fan 31, a anemometer 33 and a wind speed regulator 32; the fan 31 is arranged at one side of the device 5 to be tested and used for simulating the running wind speed of a vehicle so that wind flows uniformly flow over a hot surface, the wind speed regulator 32 is connected with the fan 31, and the wind speed is regulated by controlling the power of the fan 31 so as to reach an experimental design value, and the wind speed regulation range is 40-120km/h; the wind meter 33 is disposed on the support frame 12, and the wind meter 33 is used for measuring whether the wind speed reaches the experimental design value when the wind flows through the hot surface. The anemometer 33 is specifically installed at a position of the support frame at 3cm from the experimental surface, which is required to be resistant to high temperature, because wind speed measurement is performed in a state of heating and blowing the ternary converter, and the size is as small as possible.
The electric control assembly 4 is respectively connected with the liftable heating assembly 1, the water tank heat preservation assembly 2 and the wind control assembly 3, and is used for controlling the fan 31 and the wind speed regulator 32 and for regulating the temperature of the heating water tank 21 and the heating device 11. The electrical control assembly 4 is an existing device that includes an appliance electrical console, an appliance master switch 41, a blower switch 42, a heater switch 43, a tank heating switch 44, and the like.
The support frame 12 is provided with a temperature sensor. The temperature sensor specifically adopts 4 groups of k-type thermocouples (the diameter of the thermocouples is 0.01mm, the response time is 7 ms), metal wires at two ends of the thermocouple junctions are arranged in the hollow ceramic tube, so that the condition that gasoline cannot enter the ceramic tube is ensured, and meanwhile, the system error caused by the change of the positions of the thermocouple temperature measuring junctions due to the replacement of the three-way catalytic converter is avoided. The 4 groups of k-type thermocouples are horizontally fixed on the support frame 12 at a spacing of 1.75cm under the condition that the two ends of the k-type thermocouples are left with a spacing of 0.5 cm. The thermocouple is used for measuring the temperature distribution and the temperature change of the hot surface in real time, is uniformly connected to the data acquisition device, acquires the temperature of the measuring point position, and then obtains the average value of the temperature to obtain the hot surface temperature value.
In the experiment, the temperature of the heating device 11 is adjusted to simulate different running conditions of the vehicle, and the specific change process of the residual heat on the hot surface of the three-way catalyst after the vehicle is braked, and the data of the ignition temperature, the ignition time, the gasoline combustion process and the like corresponding to the gasoline are obtained. The heating device 11 can be lifted by the scales on two sides, and can be lifted to 40cm at most, namely, can be contacted with the surface of the device 5 to be tested, and can be lowered to the scale of 0 at most to be far away from the three-way catalyst. The distance between the heating device 11 and the three-way catalyst will change the temperature of the gas in the surrounding environment to simulate the temperature of the residual gas in the three-way catalyst and the exhaust stack after the vehicle is braked. In addition, a scale plate 17 perpendicular to the horizontal plane of the device 5 to be tested is arranged behind the heating device 11, a transverse scale and a longitudinal scale are marked on the scale plate 17, the transverse scale starts from the left end 0 scale to the right end 15cm scale, and the longitudinal scale starts from the lower 0 scale to the top 10cm scale, so that the position and the flame height of cold flame and open flame in the gasoline combustion process are measured.
Based on an ASTME659-78 hot surface liquid spontaneous combustion test standard test method, aiming at the structure of an automobile three-way catalyst and working conditions in normal operation, the invention builds an equal-proportion three-way catalyst hot surface ignition oil product leakage experiment table so as to simulate the phenomenon that the oil product is ignited on the high-temperature surface of a vehicle after the vehicle is driven for a long time. In the experimental process, the ignition time, temperature and process corresponding to different oil products under different heat surface residual temperatures after the vehicle is braked are researched by changing the wind speed, namely changing the heat dissipation condition when the vehicle runs. The heating working condition of a heating furnace (heating water tank) is changed, so that the temperature change process of the hot surface when the automobile three-way catalyst is braked again after running under different working conditions, and the corresponding ignition time, ignition temperature and specific combustion process of gasoline are researched. And (3) carrying out high-speed shooting in a dark environment to study the complete combustion process of different oil products on the hot surface, verifying the existence certainty of cold flame, and obtaining corresponding time and images of the occurrence of the cold flame and the occurrence of open flame under different conditions.
Based on the experimental principle, the experimental bench provided by the invention is adopted to carry out specific simulation tests. After the actual measurement of the vehicle braking, the residual air temperature around the three-way catalyst is 100 ℃, so that the water in the heat insulation cover 22 is heated to 100 ℃ by using the small heating boiler to simulate the residual heat of the engine and the air around the three-way catalyst after the vehicle braking. The vertical distance of the bottom of the test bed heating water tank 21 from the surface of the device 5 to be tested is determined by the vertical distance of the actual three-way catalyst from the engine compartment.
Oil mass control: the characteristic of the three-way catalyst, namely the hot surface ignition oil product, is researched, so that the ignition phenomenon can be seen only by dripping the oil product on the surface of the heated material when the heated material reaches a certain temperature. Syringe 6 was used with a 1000 μl syringe (which may be accurate to 10 μl) consistent with ASTM E659-78 standard experiments. The experimental oil amounts are 0.1ml, 0.2ml and 0.3ml respectively, and the specific temperature, time and phenomenon that the gasoline has cold flame and open flame on the hot surface under different oil amounts are recorded respectively. The specific values of the temperature and the time are obtained by a thermocouple and a timer, the shooting of the cold flame and the open flame is obtained by a high-speed camera, and the temperature and the picture of the complete process of the occurrence of the cold flame and the burning of the open flame until the extinction are captured. The diameter of the injection hole 23 is 2cm, and the injector can pass through the heat-insulating cover 22 to drop liquid on the surface of the device to be tested 5. In the experimental process, the oil product is dripped to the surface of the device 5 to be tested through the injection hole 23.
Wind speed control by controlling the wind turbine 31 and the wind speed regulator 32 to simulate the running wind speed before braking of the vehicle, the wind speeds adopted in the experiment are 40km/h,60km/h,80km/h and 100km/h. The difference of the initial wind speeds can influence the heat dissipation rate of the hot surface of the three-way catalyst and surrounding devices after the vehicle is braked, so that the corresponding temperature, time and process of the combustion of gasoline on the hot surface are changed. Other experimental data were recorded and run as above.
Heating temperature, namely changing the heating temperature of the initial experiment table, and simulating the heating conditions of the three-way catalyst and surrounding devices of the three-way catalyst under different running working conditions of the vehicle. Further, the temperature rise process of the hot surface of the three-way catalyst after the heating device 11, the wind control assembly 3 and the heating water tank 21 are removed and the ignition time, the ignition temperature and the ignition process change caused by the temperature change of the heated surface of the gasoline are studied under different initial temperatures, and other experimental data records and operations are similar to those in oil quantity control.
By experiments, it can be clearly derived that: 1) The running speed of the vehicle has influence on the time, temperature and combustion process required by igniting the oil on the hot surface of the three-way catalyst after braking. 2) The hot surface temperature affects the time, temperature, and combustion process of the ignition oil after braking of the vehicle. 3) The effect of initial wind speed and device heat generation on the temperature change process of the hot surface of the three-way catalyst. 4) The time and flame images of cold flame and open flame produced by different oils on hot surfaces under different conditions. Technical support and theoretical assistance are provided for investigation and identification of the automobile fire accident through the above research.
Claims (8)
1. The utility model provides a laboratory bench of simulation vehicle hot surface ignition oil which characterized in that: comprises a lifting heating component (1), a water tank heat preservation component (2), a wind control component (3), an electric control component (4) and an injector (6);
the lifting heating assembly (1) comprises a heating device (11), a supporting frame (12), a base installation frame (13) and a lifting adjusting device (14), wherein the heating device (11) is arranged on the supporting frame (12) and used for installing a device to be tested (5), the supporting frame (12) is connected with the lifting adjusting device (14), and the lifting adjusting device (14) is arranged on the base installation frame (13) and used for adjusting the height of the supporting frame (12);
the lifting adjusting device (14) comprises a gear (141), a rack (142) and a shaking handle (143); the shaking handle (143) is connected with the gear (141) and is used for driving the gear (141) to rotate, the rack (142) is fixedly connected with the support frame (12), and the gear (141) is meshed with the rack (142) so that the support frame (12) can be adjusted in height up and down; a graduated scale (15) for displaying the height of the supporting frame (12) is arranged on the basic installation frame (13), and a pointer (16) for pointing to the graduated scale (15) is arranged on the rack (142);
the water tank heat preservation assembly (2) comprises a heating water tank (21) and a heat preservation cover (22); the heat preservation cover (22) is arranged above the device to be tested (5), an injection hole (23) is formed in the heat preservation cover, and the heating water tank (21) is communicated with the heat preservation cover (22) and is used for providing a heat source for the heat preservation cover (22); the output end of the injector (6) penetrates through the injection hole (23) and is used for dripping oil products to the surface of the device (5) to be tested;
the wind control assembly (3) comprises a fan (31) and a wind speed regulator (32); the wind speed regulator (32) is connected with the wind machine (31) and used for regulating the wind speed of the wind machine (31);
the electric control assembly (4) is respectively connected with the lifting heating assembly (1), the water tank heat preservation assembly (2) and the wind control assembly (3) and is used for controlling the fan (31) and the wind speed regulator (32) and for regulating the temperature of the heating water tank (21) and the heating device (11).
2. The bench for simulating a vehicle hot surface ignition oil of claim 1, wherein: the wind control assembly (3) further comprises a wind meter (33), wherein the wind meter (33) is arranged on the supporting frame (12) and is used for measuring the wind speed of wind flowing through the hot surface of the heating device (11).
3. A bench for simulating a vehicle hot surface ignition oil according to claim 1 or 2, characterized in that: the heating device (11) is a silicon molybdenum rod heating table.
4. A laboratory bench for simulating a vehicle hot surface ignition oil product according to claim 3, wherein: the water tank heat preservation assembly (2) further comprises a funnel (24), a valve (25) and a liquid level indicator (26); the funnel (24) is communicated with the heating water tank (21) and is used for injecting water into the heating water tank (21), the valve (25) is arranged on a pipeline which is communicated with the funnel (24) and the heating water tank (21) and is used for controlling water injection quantity, and the liquid level indicator (26) is communicated with the heat preservation cover (22) and is used for displaying the water level of the heat preservation cover (22).
5. The bench for simulating a vehicle hot surface ignition oil of claim 4, wherein: the water tank heat preservation assembly (2) further comprises an overflow tank (27), the overflow tank (27) is communicated with the heating water tank (21), and a water discharge hole (28) is formed in the bottom of the overflow tank (27) and the bottom of the heating water tank (21).
6. The bench for simulating a vehicle hot surface ignition oil of claim 5, wherein: the support frame (12) is provided with a temperature sensor for measuring the temperature of the surface of the heating device (11).
7. The bench for simulating a vehicle hot surface ignition oil of claim 6, wherein: the heating water tank (21) is provided with a temperature sensor for measuring the temperature of the liquid in the heating water tank (21).
8. The bench for simulating a vehicle hot surface ignition oil of claim 7, wherein: the rear of the heating device (11) is provided with a scale plate (17) which is vertical to the horizontal plane of the device (5) to be tested, and the scale plate (17) is marked with transverse scales and longitudinal scales for measuring the positions and flame heights of cold flame and open flame in the gasoline combustion process.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019105947284 | 2019-07-03 | ||
| CN201910594728 | 2019-07-03 |
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