摘要
使用GT-POWER对某1.3 T四缸汽油机改制的甲醇发动机进行了仿真计算。首先建立原机(压缩比为9.5)的一维模型,并与试验数据进行对比验证。由于甲醇的辛烷值明显高于汽油,可以提高发动机的压缩比,以提高发动机的动力性和经济性。在原机模型的基础上,以0.5的幅度从9.5逐渐增加压缩比至12,结果表明,发动机并没有出现明显的爆震现象。压缩比提高到11后,发动机的动力性有一定幅度的提升,经济性明显改善;而压缩比提高到12之后,扭矩略有提升,有效甲醇消耗率比压缩比为11时降低的幅度小,但是随之带来的是大负荷时发动机的NOx排放、燃烧噪声、机械负荷和热负荷的增加。
The simulation calculation of a 1.3T four cylinder methanol engine is carried out using GT-POWER. First, a one-dimensional model of the original machine is established, and the test data is compared with the experimental data. Because the octane number of methanol is significantly higher than that of gasoline, the compression ratio of the engine can be improved, so as to improve the power performance and economic performance of the engine. On the basis of the original machine model, the compression ratio was increased from 9.5 to 12, and the result shows that the engine does not have the obvious knock phenomenon. When the compression ratio is increased to 11, the power of the engine has a certain degree of improvement, the economy is significantly improved, which also verified the engine compression ratio increased to 11 is feasible. When the compression ratio is increased to 12, the torque and thermal efficiency are further improved, but the amplitude is very small. When the load is relatively large, it will lead to a larger cylinder maximum pressure and pressure rise rate. This may lead to an increase in NOx emissions, combustion noise, mechanical load and thermal load of the engine.
作者
朱金良
蒋炎坤
ZHU Jinliang JIANG Yankun(School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 43007)
出处
《内燃机》
2017年第4期9-12,16,共5页
Internal Combustion Engines
基金
湖北省重大创新技术专项(2016AAA045)
关键词
甲醇
发动机
压缩比
一维仿真
methanol
engine
compression ratio
simulation
