零维模型在二甲醚发动机工作过程中的应用研究

利用韦伯(WIEBE)模型、WASTON模型、Whitehouse-Way模型模拟计算二甲醚(DME)发动机的工作过程,将模拟计算示功图与试验结果对比,检验上述模型在预测二甲醚发动机燃烧规律方面的准确性。对比结果表明,在适当调整喷油正时、燃烧始角、循环供油量、循环初始压力和初始温度以及燃料热值等初始参数的基础上,上述模型的模拟计算结果与二甲醚发动机试验测定数据基本相近。说明上述各模型不仅适用于理想状态下的柴油发动机运行参数预测,亦适用于二甲醚发动机运行参数的预测。

The Simulation Based on Different Mathematical Models of Combustion Process for DME Engine

This paper presents thermal-charge ratio of DME engine by numerical simulation based on Wiebe, Watson and Whitehouse-Way models, and compares the results of simulation with those of experimental data as to check these models'reliability and feasibility in predicting combustion regulation of DME engine. The comparison indicates that on base of adjusting several initial parameters such as spraying timing, start angle of combustion, fuel supply per cycle, the result of simulation is close to experimental data. This result shows that the three models suit to predict operational parameters of DME engine. From this way, we can choose and adjust all sorts of parameters on numerical simulation in a wider region, also compare the result of simulation to practical experiment with more advantages.