发动机排气热管理试验研究

Experimental Study of Exhaust Heat Management

在发动机台架上,围绕进气节流阀和排气蝶阀对排气温度的影响开展试验研究。结果表明:稳态工况下,进气节流阀的升温效果好于排气蝶阀,采用进气节流阀最大温升可达46℃,而采用排气蝶阀仅25℃;排放循环过程中,进气节流阀或者排气蝶阀对原机氮氧化物(NO_x)排放的影响较小,进气节流阀不仅升温效果好,而且油耗也稍低于排气蝶阀,采用进气节流阀平均温升可达60℃,而采用排气蝶阀仅28℃。

A research of the effects of intake and exhaust throttling valves on exhaust temperature was carried out on an engine test bench. The results show that in the steady state, the intake throttling valve is better than the exhaust one in terms of raising exhaust temperature, making the temperature rise by up to 46 ℃, while the exhaust one by only 25 ℃. In the emission cycle process, both the intake and exhaust throttling valves have a little influence on NOx emissions; the intake throttling valve makes higher rise in the temperature and slightly lower fuel consumption than the exhaust one does; the intake throttling valve can help achieve increase in average exhaust temperature by up to 60℃ while the exhaust one by only 28℃.