增压柴油机耦合条件下的环境影响研究

A Study of Environment Influence on Turbocharged Diesel Engine Under Coupling Conditions

将增压柴油机与冷却系统综合考虑,分析了大气环境对增压柴油机与冷却系统的影响机制,提出了增压柴油机与冷却系统的耦合建模方法.采用GT-Suite软件建立了耦合仿真模型,并通过实验数据对模型进行了校核.在此基础上通过改变环境条件,得到了不同环境条件下增压柴油机的性能变化规律,并与非耦合模型进行了对比分析.结果表明,采用耦合模型能够考虑环境变化引起的冷却系统变化对增压柴油机的影响,在典型环境地区,耦合模型受环境影响要明显大于非耦合模型,用两种模型计算所得到的结果差异最大可达15%左右.

With the integrated consideration of turbocharged diesel engine and cooling system, the influence of environment on turbocharged diesel and cooling system was analyzed. A new modeling approach for turhocharged diesel engine and cooling system under coupling conditions was proposed. On the basis of GT-Suite code, the coupling model was established, and the model was verified by experimental data. The investigation on coupling model was conducted to obtain the changing laws of turboeharged diesel engine performance under different environment conditions, and was compared to the non-coupling model. Simulation results indicate that the influence of cooling system changes caused by environment variety on the turbocharged diesel engine could be revealed by coupling model. It also shows that the influence of environment on coupling model is more obvious than non-coupling model in typical regions, and the maximal difference of simulation results between them could reach 15%.