摘要
在满足计算精度的情况下,提出了在内燃机进气系统中按空间网格来处理熵变的措施,使有摩擦,传热、非等熵不定常流的计算模型得到简化,并由此省去了计算熵值所需的迭代过程,可节省大量计算时间。在 Petukhov 及 Woschni 研究的基础上,针对进气过程提出的缸内传热模型提高了计算充气效率的精确性。文中给出了计算实例。
A method is presented to deal with entropy variations in space meshes in the I.C.Engine inlet system.The numerical model with friction, heat transfer,non-homentropic and non-steady flow can be simplified by using this method.The iterative procedure,which is necessary in calcul- ating entropy with the traditional method,can be omitted.Therefor,a lot of calculating time can be spared.On the basis of the study of Petukhov and Woschni,a model about heat transfer in cylinder during suction process is also presented in this paper,and by means of this model the precision in calculating volumetric efficiency can be improved.
关键词
内燃机
进气系统
数值模拟
效率
numerical modeling
non-steady flow
volumetric efficiency
inlet system
