Research on Performance Computer Evaluation Model of Low-Temperature Protective Clothing Based on Explicit Difference Method

Abstract

At present, the research institute has developed a three-layer low-temperature protection composite material. Low-temperature protective materials are mainly used for short-term low-temperature protection, effectively reducing the harm of the external environment to the human body. In this paper, considering that the heat release capacity of the phase change layer is different at different temperatures, according to the data of heat release capacity and temperature of protective materials, the change of heat release capacity Q and field temperature T is fitted by Fourier function, and the functional relationship of material heat release is obtained. Therefore, the model is divided into three stages and calculated separately. In the first stage, there is no self-heating or internal heat source in the three-layer materials, so according to the law of conservation of energy and Fourier law, the unsteady heat conduction formula is deduced and solved. In the second stage, the phase change layer begins to release heat, and the first stage model is added to each layer's heat conduction control equation with heat release capability. The third stage is similar to the first stage. With the help of the explicit difference method, the model is discretized, and the cooling model of materials is solved to effectively evaluate the protective ability of low-temperature protective composites.