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针对新型多相隔热材料的结构特征,选取了1.25μm2、.5μm、10μm的纤维尺寸,85%9、0%、95%的孔隙率,不同宏观尺寸的材料简化模型,运用改进的DSMC方法对其进行了数值模拟,旨在分析影响压力响应的众多因素,给出孔隙率、内外压比、纤维尺寸、宏观尺寸等因素对响应时间的影响规律。结果表明,孔隙率对响应时间的影响较大,同一条件下,孔隙率减小,响应时间增大;和纤维尺寸相比,响应时间对内外压比的敏感性相对较弱,内外压比增加,响应时间有所增加;同一条件下,纤维尺寸降低,响应时间增大。
Aiming at the structural characteristics of the new multiphase thermal insulation material, the fiber size of 1.25μm2, .5μm and 10μm, the porosity of 85%, the porosity of 95% and the porosity of 95% were selected. The simplified material models with different macroscopic dimensions were selected. The numerical simulation is carried out to analyze the many factors that affect the pressure response, and the influences of porosity, internal pressure ratio, fiber size, macroscopic size on the response time are given. The results show that the porosity has a great influence on the response time. Under the same conditions, the porosity decreases and the response time increases. Compared with the fiber size, the sensitivity of the response time to the external pressure ratio is relatively weaker and the internal pressure ratio increases , Response time has increased; under the same conditions, the fiber size decreases, the response time increases.