CAJ | 학술논문

针对增压气道喷射汽油机进行了发动机换气与压缩过程对燃烧特性的影响研究 ,对比了两种状态下的气门升程与配气正时 ,基于发动机试验台架测试数据 ,重点分析了发动机动力性、经济性和燃烧特性.试验数据表明了配气相位的改变对燃烧有较大的影响 ,可使燃烧效率大幅度提高 ,爆震倾向减小.同时基于AVL -fire软件进行发动机进气与压缩过程三维CFD分析 ,分析结果表明 :对燃烧特性的影响不能仅靠瞬态滚流比和缸内平均湍动能进行判断 ,真正影响燃烧的是火花塞附近湍动能的变化 ,即发动机换气与压缩过程对燃烧特性的影响来自压缩上止点火花塞附近的湍动能.
침대증압기도분사기유궤진행료발동궤환기여압축과정대연소특성적영향연구 ,대비료량충상태하적기문승정여배기정시 ,기우발동궤시험태가측시수거 ,중점분석료발동궤동력성、경제성화연소특성.시험수거표명료배기상위적개변대연소유교대적영향 ,가사연소효솔대폭도제고 ,폭진경향감소.동시기우AVL -fire연건진행발동궤진기여압축과정삼유CFD분석 ,분석결과표명 :대연소특성적영향불능부고순태곤류비화항내평균단동능진행판단 ,진정영향연소적시화화새부근단동능적변화 ,즉발동궤환기여압축과정대연소특성적영향래자압축상지점화화새부근적단동능.
For a gasoline engine with turbocharging and intake port injection ,the effect of exchange and compression process on combustion characteristic was researched and the power ,fuel economy and combustion characteristic were mainly analyzed based on the engine test bench data .It was found that the change of valve timing had great influence on combustion .The change would lead to a large increase of combustion efficiency and decrease of knock trend .With AVL-fire software ,the CFD simulation of intake and compression process was conducted .The results show that the combustion characteristic in exchange and compression process not only depends on instantaneous tumble flow ratio and in-cylinder average turbulent kinetic energy , but also turbulent kinetic energy near spark plug .That is to say ,the main influencing factor of combustion characteristic is tur-bulent kinetic energy near spark plug at the top dead center of compression .