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Analysis of the burning dummy dressed up

Release time: 2016-07-12 16:54

I saw China's first "burning dummy" at Donghua University before. Its most important role is to substitute for the fire field, to replace people to accept the fire test. Just like our ordinary people, the "burning dummy" is 1.75 meters tall and is equipped with 135 sensors throughout the body. The shoulders, neck, elbows, knees and other joints can be adjusted to simulate sitting, running, squatting and other postures.

"Rescuers are moving in the fire. This design is closer to the real environment of fire rescue, and it also increases the pertinence and effectiveness of measuring the performance of protective clothing." Professor Li Jun, director of the school's clothing design and engineering department, said.

In the combustion simulation environment laboratory, I saw the "burning dummy" wearing a helmet, gloves, and full protective clothing. Under the fire of 12 flamethrowers, he was instantly surrounded by a flame of up to 3 meters, and the flame was 6 seconds later. Off. Amazingly, after the fire, I saw that the color of the fire service suit turned black, and no damage or deformation occurred.

The developer introduced that the carbonized layer formed by the blackening of the fire protection clothing can effectively block heat transfer. This fire protection clothing can withstand a high temperature of 220 ℃ in a short time, and the longest limit time in the sea of fire can reach 16 seconds. In the dangerous environment of fire, people need to avoid thermal injuries by wearing thermal protective clothing. Thermal protective clothing is widely used to protect firefighters, steel workers and other workers working in other high temperature and dangerous places. As the clothing is exposed to flames for an extended period of time, the surface temperature of the clothing will gradually increase due to direct burning by the flame, and a large amount of heat transfer causes the air temperature under the clothing and the surface temperature of the human body to rise simultaneously. Under the flame burning of clothing, not only the thermal physical properties of the fabric itself will change and affect its thermal protection performance, but also the surface temperature of the clothing will still remain in a higher range after leaving the flash fire environment, and will be under the clothing. And the temperature of the surface of the human body forms a temperature difference, and the continuous generation of heat transfer causes the surface temperature of the human body to continue to rise. Studies have shown that burns may occur after the flash fire is over. In addition, the energy stored in the fabric is also an important factor for predicting burns. Therefore, even if the thermal protective clothing can resist the short-term burning of the flame, the clothing can still cause burns during the cooling process. So the research on the temperature change of clothing and human body surface after burning is very important.

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