烧结多孔结构的渗透和流阻特性研究

孙纪国; 王建华

烧结多孔结构的渗透和流阻特性研究

孙纪国¹,
王建华²

1.
北京航天动力研究所, 北京 100076
2.
中国科技大学工程学院, 合肥 230026

基金项目: 国家863计划;国家自然科学基金重大研究计划(90305006)

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出版历程
- 收稿日期: 2006-12-29
- 修回日期: 2007-03-05
- 刊出日期: 2008-01-28

Research on permeability and flow resistance characteristic of sintered porous structure

SUN Ji-guo¹,
WANG Jian-hua²

1.
Beijing Aerospace Propulsion Institute, Beijing 100076, China
2.
School of Engineering Science, University of Science and Technology of China, Hefei 230026, China

摘要

摘要: 为研究粉末冶金多孔结构的渗透性和流阻,以空气和氢气为介质进行了实验.实验显示微孔内流雷诺数低于1时,介质流量与穿过多孔结构的压降呈线性关系;当内流雷诺数高于1时,其流量与压降呈非线性特征.分析表明:传统的堆积床经验关系式将低估氢气和空气在烧结材料微孔中的流阻;相反,高估烧结多孔结构的渗透性能.并用粉末烧结结构的氢气和空气渗透实验数据拟合了多孔结构渗透率及摩擦阻力关联式.
- 航空、航天推进系统 /
- 多孔材料 /
- 渗透率 /
- 摩擦阻力 /
- 烧结多孔结构 /
- 发汗冷却
Abstract: To study the permeability and flow resistance of sintered porous stainless steel,a test was conducted for compressed air and gaseous hydrogen as the medium.The experimental results indicate that,there is a linear relationship between the pressure loss through the porous structure and the medium flow rate,when the flow Reynolds number in the pores is less than 1;or there is a non-linear characteristics when Reynolds number is larger than 1.This shows that:the flow friction of gaseous hydrogen or air within the pores is underestimated using the traditional correlations based on the experiments of packed beds;but the permeability of the sintered porous structure is overestimated by the Ergun's corrective correlation.The relationship between the friction resistance and permeability of hydrogen or air flowing through the porous structure was simulated with the aid of the experimental data.
- aerospace propulsion system /
- porous material /
- permeability /
- friction resistance /
- sintered porous structure /
- transpiration cooling

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参考文献(6)

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