摘要
利用三维燃烧模型对稀燃CNG发动机的燃烧过程进行数值模拟,研究在引入过量空气系数的循环变动情况下,发动机转速对稀燃CNG发动机燃烧循环变动程度的影响。通过对比计算和试验结果,验证了模型的可靠性,并且分析了燃烧过程中不同时刻下的缸内温度分布情况。根据多个循环的计算结果,定量分析了发动机转速对燃烧循环变动的影响,转速的提高将使燃烧循环变动减弱。计算还得出,转速的改变对燃烧循环变动的影响程度大于对燃烧峰值压力均值的影响。
In this paper, three-dimension models have been used to simulate the combustion process on a lean burn CNG engine. The effects of engine speed on combustion cyclic variations were analyzed when the cyclic equivalence ratio variations existed. The numerical models were validated by comparison of predicted and experimental in-cylinder mean pressure. Then the incylinder temperature distributions in combustion processes were analyzed. According to computed results of the large number of cycles, the effects of engine speed on combustion cyclic variations were discussed. Results showed that the less combustion cyclic variations, the higher engine speeds. Results also indicated that the engine speed had a larger influence on combustion cyclic variations than the peak pressure.
出处
《车用发动机》
北大核心
2006年第4期6-10,共5页
Vehicle Engine
基金
国家自然科学基金项目资助(50406003)
关键词
CNG发动机
稀薄燃烧
燃烧循环变动
三维燃烧模型
CNG engine
lean burn
combustion cyclic variations
three-dimension combustion models
