Effects of lean combustion coupling with intake tumble on economy and emission performance of gasoline engine
Effects of lean combustion coupling with intake tumble on economy and emission performance of gasoline engine
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DOI：
10.1016/j.energy.2017.05.131
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发表时间：
2017-08
期刊：
影响因子：
9
通讯作者：
Feng Zhou;Jianqin Fu;Wenhui Ke;Jing-ping Liu;Zhipeng Yuan;B. Luo
中科院分区：
文献类型：
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作者：
Feng Zhou;Jianqin Fu;Wenhui Ke;Jing-ping Liu;Zhipeng Yuan;B. Luo
为了改善车用汽油机的经济性和排放性能，研究了稀薄燃烧与进气滚流耦合的方法。在进气歧管上设计了进气道阻断器，以产生进气滚流，并在发动机常用工况（2000 r/min，2.6 bar）下进行了进气道阻断器开启和关闭两种状态下的过量空气系数扫掠试验。在此基础上，研究了稀薄燃烧与进气滚流耦合对汽油机工作过程、燃烧和排放性能的影响。试验结果表明，利用进气滚流可以在保证燃烧稳定性的前提下，显著提高发动机的稀燃极限，进一步增强稀燃的节能减排潜力。与原机初始状态（λ = 1.0，进气道阻断器关闭）相比，指示热效率提高7.2%，CO2、CO、HC和NOX的比排放最大分别降低5.8%、72.2%、12.0%和85.3%。特别是NOx的最小比排放量仅为2.0g/（kW·h）。结果表明，稀薄燃烧与进气滚流耦合对汽油机具有很大的节能减排潜力。
To improve the economy and emission performance of automotive gasoline engine, the approach of lean combustion coupling with intake tumble was investigated. A port blocker was designed on intake manifold so as to generate intake tumble, and then the sweeping test of excess air coefficient was conducted under engine common conditions (2000 r/min, 2.6 bar) in two port blocker states (opening and closing). On this basis, the effects of lean combustion coupling with intake tumble on the working process, combustion and emission performance of gasoline engine were studied. The tested results indicate that lean combustion limit is obviously extended with acceptable combustion stability by utilizing intake tumble, thus the potential of energy conservation and emission reduction by lean combustion can be further enhanced. Compared with the initial state of original engine (λ = 1.0, port blocker closing), the indicated thermal efficiency can be increased by 7.2%, and the specific emissions of CO2, CO, HC and NOXcan be reduced by 5.8%, 72.2%, 12.0% and 85.3% at most, respectively. In particular, the minimum specific emission of NOXis only 2.0 g/(kW·h). The results demonstrate that lean combustion coupling with intake tumble has great potential of energy conservation and emission reduction for gasoline engine.