多孔隔热材料内压响应的影响因素分析  

The investigation of pressure response in thermal insulation material

作　　者：黄飞[1] 程晓丽[1] 俞继军[1] 姜贵庆[1] 

机构地区：[1]中国航天空气动力技术研究院,北京100074

出　　处：《空气动力学学报》2011年第5期580-584,606,共6页Acta Aerodynamica Sinica

摘　　要：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。Pressure response of two-dimension multiphase thermal insulation material with fiber diameter of 1.25μm,2.5μm,10μm have been analyzed with DSMC approach at different internal-external pressures.The purpose of this study is to investigate effects of fiber diameter,aperture ratio,internal-external pressures and macrocosmic material thickness on pressure response.The results show that at the same conditions,response time increases as aperture ratio and fiber diameter decreases,respectively.Influence of the ratio of internal-external pressure on response time is not obvious.The ratio of internal-external pressure increase,response time increase a little.At the same ratio of internal-external pressure,response time tends to be close.

关 键 词：多相隔热材料 DSMC 多孔简化模型 压力响应 

分 类 号：V45[一般工业技术—材料科学与工程]