点燃式发动机燃用不同燃料的燃烧特性及循环变动

发布时间：2019-05-21 10:01

【摘要】：围绕点燃式发动机燃用汽油、LPG和CNG的燃烧特性及循环变动开展了研究.发动机在最大转矩工况运行,分别从压力参数方面及燃烧参数方面对循环变动进行了分析.结果表明,汽油的燃烧循环变动系数最小,LPG燃烧过程中循环变动系数增大,CNG燃烧过程中循环变动系数最大;燃烧阶段循环变动是产生发动机循环变动的主要原因,采用进气道预混的方式燃用气体燃料时,进气阶段变动是造成发动机循环变动的原因之一;汽油燃烧时,火焰发展期与燃烧持续期线性相关,良好的着火决定燃烧过程的稳定,LPG和CNG燃烧时,火焰发展期与燃烧持续期的相关性减弱,着火和火焰的传播共同影响燃烧过程的稳定性;放热率型心与平均指示压力有良好的线性关系,说明发动机的平均指示压力受放热过程的影响.
[Abstract]:The combustion characteristics and cycle changes of gasoline, LPG and CNG around the ignition engine are studied. The engine is operated under the maximum torque condition, and the cyclic variation is analyzed from the pressure parameters and the combustion parameters, respectively. The results show that the combustion cycle variation coefficient of the gasoline is the least, the cyclic variation coefficient in the process of the LPG combustion is increased, the cyclic variation coefficient is the biggest in the CNG combustion process, and the cyclic variation of the combustion phase is the main cause of the engine cycle change. When the gas fuel is used in a premixed mode of the air inlet, the change in the intake phase is one of the causes of the engine cycle change; when the gasoline is burned, the flame development period is linearly related to the combustion duration, the good ignition determines the stability of the combustion process, and when the LPG and the CNG are burned, The correlation between the flame development period and the duration of the combustion is reduced, and the ignition and the propagation of the flame affect the stability of the combustion process. The heat release rate type core has a good linear relationship with the average indicating pressure, and the average indicating pressure of the engine is affected by the heat release process.
【作者单位】：江苏大学汽车与交通工程学院;
【基金】：国家自然科学基金资助项目(51376083) 江苏省高校自然科学基金重点资助项目(13KJA470001) 2011年江苏高校优势学科建设工程资助项目(苏政发办[2011]6号) 江苏省2013年度普通高校研究生科研创新计划项目(CXZZ13_0672) 江苏省2014年度普通高校研究生科研创新计划项目(KYLX_1035)
【分类号】：TK401

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