稀燃氛围下低碳醇汽油燃烧及爆震特性模拟研究
Simulation Study on Combustion and Knock Characteristics of Low-Carbon Alcohol Gasoline Under Lean-Burn Atmosphere
基于半解耦思想构建了TRF/乙醇/正丁醇五组分简化机理,模拟研究了稀燃氛围下增压直喷汽油机燃用低碳醇汽油的燃烧过程及爆震特性。结果表明,稀燃有利于降低爆震强度,在稀燃氛围下掺混正丁醇增加了爆震趋势,温度场、自由基场、速度场等不同场分布均对爆震燃烧过程有所体现,但爆震强度变化与掺混比例密切相关,不同掺混比下正丁醇的物理化学作用所占据的地位不同。此外,稀燃与掺混正丁醇均有利于提升热效率,加快火焰传播速度,在 15%掺混比下爆震时刻最早但爆震强度较为温…查看全部>>
A simplified five-component mechanism of TRF/ethanol/n-butanol was constructed based on the idea of semi-decoupling,and the combustion process and knock characteristics of a boosted direct injection gasoline engine burning low-carbon alcohol gasoline under a lean-burn combustion atmosphere were simulated and studied.The results show that lean-burn combustion is conducive to reducing the knock intensity,blending n-butanol in a lean-burn atmosphere increases t…查看全部>>
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