大功率车用柴油机燃用航空煤油的燃烧仿真研究

Simulation on Combustion of High Power Vehicle Diesel Engine Fuelled with Jet Fuel

建立了大功率车用柴油机燃用柴油和航空煤油的缸内燃烧模型。该模型利用喷雾试验结果对KH-RT破碎子模型进行了标定,同时耦合了燃油的化学反应动力学机理,具有较高的仿真精度。计算结果表明:相比柴油,柴油机燃用航空煤油喷雾破碎过程中雾化质量提高;燃烧过程中缸内滞燃期缩短,放热率峰值下降,缸内机械负荷及热负荷均得到缓解;柴油机燃用航空煤油在标定工况点相比燃用柴油功率下降5.8%,油耗率相当。

A combustion model was established for high power vehicle diesel engine fuelled with diesel and jet fuel. In this combustion model, the KH-RT breakup model was calibrated with fuel spray test results, while chemical reaction kinetic models were coupled for a better accuracy. The result shows that compared with diesel, a better atomization quality is obtained for jet fuel; ignition delay is shortened and peak of heat release rate decreases in the cylinder combustion process, while mechanical load as well as thermal load are relieved. The engine power decreases by 5.8% with jet fuel at calibration point and fuel consumption rate are basically the same for both fuels.