| 汽车尾气催化器温度场的研究 |
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| 引用本文： | 王翔,王维城,王栋,王建昕.汽车尾气催化器温度场的研究[J].清华大学学报(自然科学版),2002,42(5):669-672. |
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| 作者姓名： | 王翔 王维城 王栋 王建昕 |
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| 作者单位： | 1. 清华大学,热能工程系,北京,100084
2. 清华大学,汽车工程系,北京,100084 |
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| 基金项目： | 国家自然科学基金资助项目 ( 5 0 0 76 0 2 1) |
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| 摘 要： | 为研究汽车尾气催化器在汽车启动过程中的温度场 ,建立了描述催化器内复杂物理化学过程的二维非稳态数理模型。利用热流体计算软件 Phoenics1.4对模型进行了稳态与非稳态的计算 ,分析了尾气流量、载体上贵金属活性中心表面积等对催化器温度场及其转化效率的影响。为验证模型的可靠性 ,在实际的发动机台架上研究了国产催化器内的温度场及其转化效率。研究表明 :加大尾气流量 ,增加载体上贵金属活性中心表面积等措施可加快催化器的起燃速度 ;但当催化器接近稳态时 ,尾气流量越大 ,催化器的转化效率反而越低
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| 关 键 词： | 尾气排放 催化转化器 温度场 计算传热学 |
| 文章编号： | 1000-0054(2002)05-0669-04 |
| 修稿时间： | 2001年2月23日 |
Temperature fields in automotive catalytic converters |
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| WANG Xiang ,WANG Weicheng ,WANG Dong ,WANG Jiangxin.Temperature fields in automotive catalytic converters[J].Journal of Tsinghua University(Science and Technology),2002,42(5):669-672. |
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| Authors: | WANG Xiang WANG Weicheng WANG Dong WANG Jiangxin |
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| Institution: | WANG Xiang 1,WANG Weicheng 1,WANG Dong 1,WANG Jiangxin 2 |
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| Abstract: | A two-dimensional unsteady mathematical model was presented for describing the complex physical and chemical processes in catalytic converters. The thermal hydraulics software Phoenics version 1.4 was used for the steady and unsteady numerical simulations which account for the effect of many factors on the converter temperature field and conversion efficiency, such as the gas fluxes and the noble metal loading. The model reliability was verified experimentally on an engine bench test using locally produced monolith substrates and catalysts. The study shows that the converters will approach the light-off state more quickly with increasing gas flux and noble metal loading. However, at steady state, the conversion efficiency decreases as the gas flux increases. |
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| Keywords: | automobile emissions catalytic converters temperature fields numerical heat transfer |
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