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研究报告

Characteristics of NO_x emission from gas engine under transient operating conditions

摘要：NO_x排放控制是发展燃气汽车的核心问题.为获得增压中冷燃气发动机瞬态工况NO_x的排放特征,实验选取了6MK375N-50增压中冷燃气发动机,研究了不同转速、转矩、进气流量、进气温度及湿度对NO_x排放的影响.试验结果表明NO_x的排放随着转速的增加先升高后减缓,转速为1400 r·min^-1时NO_x排放最高,转矩的增加也会使NO_x排放增加,随着进气流量的增加,NO_x排放量先增加后稳定,进气流量为180 kg·h^-1时NO_x排放最高,进气温度对NO_x排放也有直接影响,进气温度为31℃时NO_x排放最高,随着进气湿度的增加,NO_x排放水平降低,对试验结果的双因素方差分析得到,各影响因素对NO_x的排放影响均非常显著.对1400 r·min^-1下各个工况对应NO_x进行拟合,变化规律符合公式y=a-b×ln(x+c).

Abstract：NO_x emission control is the core issue of development of gas vehicles. To obtain the characteristics of NO_x emission from gas engine under transient operating conditions, we selected the 6MK375N-50 turbocharged inter-cooled gas engine and investigated the effects of rotating speed, torque, inlet flow rate, inlet flow temperature, and inlet flow humidity on NO_xemissions. The results showed that NO_x emissions increased first and leveled off with increasing rotational speed. NO_x emission was the most significant under the rotating speed of 1400 r·min^-1. The increase in torque results in the increase of NO_xemission. NO_x emission increased steadily in the beginning and then leveled off along the increase of inlet flow rate.The highest NO_x emission was obtained under the inlet flow rate of 180 kg·h^-1. Meanwhile, the inlet temperature has a direct effect on NO_x emission, with the maximum NO_x emission achieved at inlet temperature of 31℃. NO_x emission decreased with the increase of inlet flow humidity. All the above-mentioned factors have significant influence on the NO_x emission by calculating the test results based on two-factor variance analysis. By fitting the abovementioned parameters with NO_x emission, the empirical equation under 1400 r·min^-1 was derived in accordance with y=a-b×ln(x+c).