基于不同增压系统共轨柴油机变海拔工作特性模拟

发布时间：2018-04-22 20:37

本文选题：柴油机 + 变海拔　；参考：《内燃机学报》2016年06期

【摘要】：以两级增压共轨重型柴油机为研究机型,采用GT-Power构建了其一维热力学仿真模型,对比模拟了柴油机采用两级增压(2,TC)和单级增压(1,TC)的变海拔(0、2和4,km)工作特性.结果表明:1,TC压气机效率在发动机低速和高速时随海拔升高而降低.对于2,TC,低压级压气机效率在发动机低速时随海拔升高而降低,而高压级效率随发动机转速增加呈先升后降,且在0海拔下高转速时显著减小;相比1,TC,2,TC在高海拔下低速时的排气损失率显著降低,但传热与摩擦损失率增大,同时泵气损失随转速增大逐渐高于1,TC;随EGR率增大,1,TC压气机效率呈先升后降,且随海拔升高而降低.2,TC低压级效率随EGR率增大而快速降低,而高压级效率呈先升后降,并在低EGR率时随海拔升高而增大;随EGR率增加,2,TC传热损失逐渐高于1,TC,但能显著降低高海拔时排气损失率和改善NO_x-BSFC之间trade-off关系.
[Abstract]:The one-dimensional thermodynamic simulation model of two-stage supercharged common rail heavy diesel engine was constructed by using GT-Power. The working characteristics of diesel engine with two-stage supercharging (TC2) and single-stage supercharging (1km) were compared and simulated. The results show that the efficiency of the 1 / 1 Tc compressor decreases with the increase of altitude at low and high speed. For 2t TC, the efficiency of low pressure stage compressor decreases with the increase of altitude at low speed, while the efficiency of high pressure stage increases first and then decreases with the increase of engine speed, and decreases significantly at high speed at 0 altitude. Compared with 1 TC2TC at high altitude at low speed, the exhaust loss rate decreased significantly, but the heat transfer and friction loss rates increased, and the pump gas loss increased with the increase of rotational speed, and the efficiency of 1TC compressor increased first and then decreased with the increase of EGR rate. With the increase of altitude, the efficiency of low pressure grade decreased rapidly with the increase of EGR rate, while the efficiency of high pressure grade increased first and then decreased, and increased with the increase of altitude at low EGR rate. With the increase of EGR rate, the heat transfer loss of Tc is higher than that of Tc, but it can decrease the loss rate of exhaust gas and improve the trade-off relationship between NO_x-BSFC at high altitude.
【作者单位】：昆明理工大学云南省内燃机重点实验室;
【基金】：国家自然科学基金资助项目(51366007,61263026) 云南院省校科技合作资助项目(2013IB001) 云南省教育厅资助项目(2016YJS027,2015J025)
【分类号】：TK421

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