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Experimental process and requirements of combustion dummy system

Release time: 2016-08-30 11:48


Burning dummy system:
Donghua University's combustion dummy system "Donghua Fireman" was used in the study [7]. The surface of the dummy is evenly distributed with 135 high-temperature 60 sensors, and joints in all parts can move, which can simulate a variety of postures of the human body, and also has a dynamic simulation function [8]. In the combustion simulation laboratory, 6 groups of 12 flamethrowers were distributed around the burning dummy to simulate the flash fire. By analyzing the data and heat flow transmitted by each sensor of the fake human body surface in the flash fire experiment, the burn level of each sensor on the skin surface, the total area of the burn, and the time to produce Ⅱ and Ⅲ degree burns were predicted [8-9 ].
Infrared camera <br /> objects with a temperature above absolute zero will form a certain temperature field on the surface [10]. Infrared camera can sensitively sense the infrared radiation on the surface of the object, and can accurately measure the temperature of the surface of the object being measured [10-11]. In this study, a Mikron M7604F / M7604G dual-band infrared thermal imager was used to determine the trend of the surface temperature of the measured clothing during the combustion dummy test. At the same time, multi-angle analysis is performed on the infrared images and data captured by the thermal imager.

test:
Test fabric <br /> The fabric used in the thermal protection experimental clothing used in the study is a flame-resistant aramid outer fabric, which is a blend of 93% aramid 1313, 5% aramid 1414, and 2% P-140 conductive carbon fibers. Stable flame retardant performance, abrasion resistance and antistatic performance [1-2]. The experiments used three different weight fabrics to make thermal protective clothing. The basic parameters are shown in Table 1.

The garment samples are the classification, fabric, and size code of 10 sets of experimental garments. Among them, garments A, B, and C represent successively increasing 80-inch feet in the latitude direction. The specific garment size details are shown in Table 3.
In this experiment, 10 sets of thermal protective clothing were used as test clothing samples. The design and implementation organization of experimental clothing combined with experimental conditions are shown in Table 4. The experiment is implemented with reference to the relevant requirements of ISO13506-2008


Test method <br /> This experiment mainly uses infrared thermal imaging cameras to observe the surface temperature of clothing, and uses the combustion dummy system to collect and analyze the surface temperature of the human body.
Fix the infrared camera before burning, then expose the burning dummy to the flash fire environment, and record the temperature changes on the surface of the garment and the dummy through the thermal camera and dummy system. The thermal camera photographs the front part of the dummy. The thermal image was selected at a temperature of 105 degrees. The selected location area corresponds to the combustion dummy sensor. A total of 35 temperature areas were selected on the front of the dummy.

Test results and discussion <br /> In the experiment, thermal imaging cameras and combustion dummy systems were used to record data on the surface temperature changes of clothing and dummy. The front part of the Burning Dummy is divided into three parts: arms, torso and legs, and discussed from these three parts.

When the clothing left the flame for a short time after the end of the combustion experiment, the surface temperature of the clothing remained at a high temperature (> 100oC, especially the extremities); the initial temperature drop was obvious after the flashover, and then gradually relaxed until it reached room temperature. From Figure 4, the temperature of the dummy surface has been rising at a speed of about 0.5oC / S within a few seconds after the combustion is completed, and reaches a peak value in about 10 seconds. In addition, it can be found that after the temperature reaches the peak value, the temperature Fall slowly. This means that the thermal protective clothing can block the direct burning of the flame and play a thermal insulation function during a flash fire. Also due to its thermal insulation properties, clothing has a significant hindrance to human heat dissipation after the flash fire.

in conclusion:
Based on the combustion dummy system and the use of infrared thermal imaging cameras to test the temperature of clothing and dummy surfaces, the following conclusions were obtained:
(1) The temperature on the surface of the garment will remain high for a long time after the combustion is over. And the high temperature of the clothing surface will be transmitted to the human body through the fabric, and the surface temperature of the human body will rise at a rate of about 0.5 ° C / S within 10 seconds. 205
(2) The surface temperature of clothing and human body will be different due to the flash burning time, clothing size, fabric weight and posture changes. The thermal and thermal performance of clothing systems also changes due to these factors.
(3) The average rise rate α (oC / s) between the surface temperature of the dummy and the maximum value of the surface temperature of the dummy before the flash combustion test ends (oC / s) s) reflects the temperature change after the flash test of the dress dummy system. The heat dissipation efficiency index γ can integrate the heat dissipation effect of the system and reflect the heat storage condition to a certain extent.


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