多孔隙隔热材料内压的时间响应

尝试将DSMC方法运用在隔热材料的机理研究中,对多相隔热材料的二维简化模型分别进行了厚度在1mm、2.5mm5、mm下,不同内外压比下压力时间响应的计算分析,旨在研究此种材料内部的压力时间响应及其影响因素。结果表明:压力响应时间随内外压比的增加、厚度的增加都在不断增加。相对内外压比而言,厚度对响应时间的影响比较明显,而内外压力比相同时,响应时间没有明显变化。在同一压比下,随着材料厚度的增加,响应时间将呈现非线性增加。厚度在毫米量级时的响应时间约在几十微秒至毫秒量级,响应时间与厚度近似呈现指数关系。

The Study of Pressure Respond to Time on Multiaperture Insulating Material

Pressure respond to time of two-dimension multiphase insulating material with thickness of 1mm, 2.5mm, 5mm have been analyzed with DSMC approach at different internal-external pressures. The results show that respond time increase as the ratio of internal-external pressure increase and thickness increase. Influence of the ratio of internal-external pressure on respond time is not obvious, influence of thickness on it is obvious. At the same the ratio of internal-external pressure, respond time tend to be no-linear as thickness increasing. Respond time is millisecond magnitude when thickness is millimeter magnitude, and respond time is near exponential growth as thickness increase.