Attempt of Multiple Stage Injection with EGR for High Load Operation of a Premixed Compression Ignition Engine.
Attempt of Multiple Stage Injection with EGR for High Load Operation of a Premixed Compression Ignition Engine.
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预混压燃式发动机高负荷运行的 EGR 多级喷射尝试。
DOI：
10.1299/kikaib.66.286
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
K. Tsujimura
中科院分区：
文献类型：
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作者：
T. Hashizume;T. Miyamoto;Hisashi Akagawa;K. Tsujimura
通过在压缩冲程的非常早期阶段喷射燃料，从而在点火之前产生均匀的稀混合物（PREDIC;预混合稀燃烧），实现了NOx和烟的同时减少。然而，由于增加混合物当量比会引起爆震，因此难以在较高负荷条件下操作。为了降低预混压燃式发动机高负荷工况下的燃烧速率，将多级喷射与EGR相结合，并在点火前形成非均质混合气。发动机测试结果表明，NOx排放量可以降低到50 ppm以下，即使在满负荷条件下也不会发生爆震。此外，烟雾排放量亦维持在无形水平以下。可以理解的是，燃料的预混合提前，减少了烟度，并增加了EGR率，从而降低了放热率和NOx排放。
By injecting fuel at the very early stage of compression stroke and thus creating homogeneous lean mixture before ignition, (PREDIC;PREmixed lean DIesel Combustion), simultaneous reduction of NOx and smoke was obtained. However, since increasing the mixture equivalence ratio cause knocking, it was difficult to operate at higher load conditions. In this study, in order to reduce combustion rate at high load conditions in a premixed compression ignition engine, multiple stage injection method and EGR were combined, and heterogeneous mixture was made before ignition. The engine test results showed that NOx emissions could be reduced to less than 50 ppm, without knocking even at full load conditions. In addition, smoke emissions were also maintained below invisible level. It can be understood that the premixing of fuel was advanced, smoke was reduced, and EGR rate was increased, resulting lower heat release rate and NOx emissions.