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Burning dummy technology

What exactly is the significance of burning dummies? Qinsun next looks with you at the value of the existence of burning dummies.

In a hazardous fire environment, people need to escape from flame damage by wearing thermal protective clothing. Thermal protective clothing is widely used to protect firefighters, steelworkers, and workers engaged in other hot and dangerous situations.

As the exposure time of the clothing increases, the surface temperature of the clothing will gradually increase due to the direct burning of the flame, and the large amount of heat transfer makes the air layer under the clothing and the surface temperature of the human body increase at the same time. Not only will the thermal and physical properties of the fabric itself change under the flame burn and affect its thermal protection properties, but also after leaving the flash fire environment, the surface temperature of the garment will remain in a higher range and form a temperature difference with the temperature under the garment and the surface of the human body, continuing to produce heat transfer to the surface temperature of the human body continues to rise.

Studies have shown that burns can occur after the flash fire is over, and that the energy stored in the fabric is also an important factor in predicting burns. Therefore, even though thermal protective clothing can resist the flame for a short period of time, the garment can still cause burns during the cooling process. Therefore, the study of temperature changes on the garment as well as the human surface after burning is particularly important.

Burning dummy technology

The use of infrared thermal imaging camera to monitor the surface temperature changes of clothing in the burning dummy system dressing test, the use of sensors on the body surface of the burning dummy to reflect the temperature changes of the skin surface, analysis of the flash fire time, clothing materials and size, and dressing posture state on the surface temperature changes. The combustion dummy is used to test the above parameters in order to provide reference for the design and development of thermal protective clothing.

A study of multi-layer protective clothing using the TPP instrument (Thermal Protection Performance Tester) showed that the outermost fabric has an important influence on the protective performance of multi-layer protective clothing. Tests using the TPP instrument found that prolonged exposure to heat sources with low heat flow is more likely to result in burns than short periods of intense burning.

In the actual wearing process, the thermal protection performance of clothing does not only depend on the performance of the fabric itself, but also needs to be considered in terms of clothing style design, specifications and dressing posture. In order to simulate as realistically as possible the human body in the actual fire and the safe and accurate determination of clothing and the surface temperature of the human body, the burning dummy test method shows the advantages.

 



2021-11-15 10:13:54

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