Experimental investigation on the influences of exhaust gas recirculation coupling with intake tumble on gasoline engine economy and emission performance
Experimental investigation on the influences of exhaust gas recirculation coupling with intake tumble on gasoline engine economy and emission performance
复制标题
DOI：
10.1016/j.enconman.2016.09.033
复制
发表时间：
2016-11
影响因子：
10.4
通讯作者：
Jianqin Fu;Guohui Zhu;Feng Zhou;Jing-ping Liu;Yan Xia;Shuqian Wang
中科院分区：
文献类型：
--
作者：
Jianqin Fu;Guohui Zhu;Feng Zhou;Jing-ping Liu;Yan Xia;Shuqian Wang
为了提高汽油机部分负荷下的经济性和排放性能，通过台架试验研究了废气再循环与进气滚流耦合的方法。基于自然吸气汽油机，在两种进气模式（有/无进气滚流）下进行废气再循环率扫查试验，测量了与发动机热功转换过程和排放性能相关的参数。通过对实测数据的对比分析，揭示了废气再循环与进气滚流耦合对汽油机经济性和排放性能的影响。结果表明，随着废气再循环率的增加，泵气损失逐渐减小，缸内残余气体分数线性增加；由于传热损失和废气能量损失减少，高压循环效率随着废气再循环率的增加而提高。由此可见，指示热效率的提高是低压循环和高压循环双重效益的叠加。在 1600 r/min 和 2.94 bar 下，指示热效率可提高 4.29%。随着废气再循环率的增加，氮氧化物排放量几乎呈线性下降，但碳氢化合物和一氧化碳排放量在废气再循环率的有效范围内没有明显变化。进气滚流的最大优点是可以扩大废气再循环率的有效范围。废气再循环节能减排潜力大幅提升。
To improve the economy and emission performance of gasoline engine under part load, the approach of exhaust gas recirculation coupling with intake tumble was investigated by bench testing. Based on a naturally aspirated gasoline engine, the sweeping test of exhaust gas recirculation rate was conducted in two intake modes (with/without intake tumble), and the parameters related to engine heat-work conversion process and emission performance were measured. Through comparing and analyzing the measured data, the effects of exhaust gas recirculation coupling with intake tumble on gasoline engine economy and emission performance were revealed. The results show that pumping loss decreases gradually while in-cylinder residual gas fraction increases linearly with the exhaust gas recirculation rate increasing; the high-pressure cycle efficiency ascends with exhaust gas recirculation rate increasing due to the decrease of heat transfer loss and exhaust gas energy loss. Thus, the improvement of indicated thermal efficiency is the superposition of double benefits of low-pressure cycle and high-pressure cycle. At 1600 r/min and 2.94 bar, the indicated thermal efficiency can be increased by 4.29%. With the increase of exhaust gas recirculation rate, nitrogen oxide emissions almost fall linearly, but hydrocarbon and carbonic oxide emissions have no obvious change in the effective range of exhaust gas recirculation rate. The biggest advantage of intake tumble is that it can extend the effective range of exhaust gas recirculation rate. As a result, the potential of energy conservation and emission reduction of exhaust gas recirculation is largely improved.