CAJ | 학술논문

在验证平原下某增压柴油机计算模型基础上，对某增压柴油机在海拔2900 m和海拔4250 m条件下缸内工作过程进行了三维数值计算．计算结果表明：与平原相比，随着海拔的升高，放热率峰值下降但放热率重心前移，缸内温度迅速升高，缸内最高温度分别上升309和357 K；缸内最高燃烧压力分别下降4.9和5.53 MPa；NOx 出现时间随海拔上升而稍微提前，NOx 排放量随海拔的上升而下降．研究结果为优化高原增压柴油机的性能提供了参考．
재험증평원하모증압시유궤계산모형기출상，대모증압시유궤재해발2900 m화해발4250 m조건하항내공작과정진행료삼유수치계산．계산결과표명：여평원상비，수착해발적승고，방열솔봉치하강단방열솔중심전이，항내온도신속승고，항내최고온도분별상승309화357 K；항내최고연소압력분별하강4.9화5.53 MPa；NOx 출현시간수해발상승이초미제전，NOx 배방량수해발적상승이하강．연구결과위우화고원증압시유궤적성능제공료삼고．
On the base of validating the calculation model of a turbocharged diesel on the plain ,three-dimension-al numerical simulation of in-cylinder working process at 2 900 and 4 250 meters above sea-level is carried out . The results show that ,compared with the situation on the plain ,the peak value of heat release rate lowers , but the crank angle of the center of heat release rate curve advances ,combustion temperature increases rapidly , the maxi-mum temperature rises 309 K and 357 K.The maximum combustion pressure is decreased by 4.9 MPa and 5.53 MPa,respectively;NOx appears earlier and NO x emission decreases with an increase in altitude .The research pro-vides reference for optimization of the turbocharged diesel′s performances at a high altitude .