催化涡轮处理汽车冷启动废气研究

Research of automobile cold start exhaust gas by catalytic turbine

针对汽油机冷启动期间排气污染问题,提出利用催化陶瓷涡轮技术处理汽车尾气的新方案,建立催化涡轮有限元模型并利用Fluent软件对其进行CFD分析,得到催化涡轮内部温度场、压力场及物质的质量分数分布。计算结果表明:废气得到有效处理,催化反应的剧烈区间在叶片前缘到20%弦长位置处,在10%弦长位置处反应最为剧烈,化学反应速率最大;通过凯策试验台对比10%、50%、90%不同叶高三种物质的质量分布,发现催化反应主要发生在叶片表面的低叶高位置处。综合分析表明催化涡轮可有效减少汽车冷启动产生的废气。研究结论可为催化涡轮优化设计提供参考。

Aiming at the exhaust pollution problem of gas engine during cold start,a new scheme of treating automobile exhaust gas by catalytic ceramic turbine technology is proposed.The finite element model of catalytic turbine is established and CFD analysis is carried out by using Fluent software.The results show that exhaust gas is effectively treated,and the catalytic reaction range is from blade leading edge to 20%chord length,the reaction is the most intense at 10%chord length,and the chemical reaction rate is the highest.By comparing the mass distribution of three substances with different leaf heights of 10%,50%and 90%on Kaiser test bed,it is found that the catalytic reaction mainly occurs at the low leaf height position on the leaf surface.Comprehensive analysis shows that catalytic turbine can effectively reduce the exhaust gas generated by cold start of automobile,and this study provides reference for the optimal design of catalytic turbine.