Effect of Mixer Body Temperature on Urea Atomization Under Low Exhaust Temperature Condition
In order to improve the poor urea atomization effect of diesel engine at low exhaust temperature(200 ℃),this paper studied the effect of mixer body temperature on SCR system under low exhaust temperature condition of diesel engine.Based on 1 200 r·min-1,20％load condition of 4102 diesel engine in the cloud,computational fluid dynamics(CFD)technology was used for numerical simulation.Comparing with the pressure drop,trace and liquid film distribution on the upper wall of the two mixers,the more suitable mixer type was selected.By changing the temperature of the mixer,the effect of different temperature of the mixer on the wall liquid film and the NH3 uniformity coefficient in front of the catalytic converter was compared and analyzed.The results show that the temperature change of the mixer body has a great influence on the formation of liquid film.When the temperature of the mixer increases from 100℃ to 200 ℃,the liquid film area on the mixer decreases obviously.The increase of the body temperature of the mixer has a significant effect on the NH3 uniformity coefficient.As the temperature of the mixer body increases,the uniformity coefficient of NH3 increases obviously,and the uniformity coefficient of NH3 is closer and closer to 1 with the increasing temperature.The atomization effect of urea and the uniformity coefficient of NH3 can be effectively improved by keeping the mixer at a proper temperature.
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