中文摘要：

利用低温等离子体（NTP）喷射系统,对自行设计的分段型废气再循环（EGR）冷却器进行了NTP喷射再生试验.试验采用4种不同的喷射策略,控制活性气体总流量均为10,L/min,改变各进气口流量大小.通过测量内部轴向温度及反应物中CO和CO2的体积分数,分析了不同策略对再生的影响.结果表明:分段喷射改变了EGR冷却器内部轴向温度场变化规律,使得后半段温升ΔT较高.不同策略中CO和CO2体积分数的变化趋势总体保持一致,均为先升后降,但CO体积分数比CO2的低.运用分段喷射策略可以提高NTP活性气体的利用率,故分段喷射再生效果均优于未分段再生.其中,策略4采用各进气口逐级递减的流量配比,积碳去除量最多,为2.42,g,是未分段喷射再生的两倍,再生效果最好.

英文摘要：

For different injection strategies, an experimental study on the regeneration of self-designed exhaust gas recirculation (EGR) coolers was conducted using non-thermal plasma (NTP) injection system. Four strategies were employed to control the total flow constant at 10 L/min and change the branch flows. By measuring the axial temperature distribution and volume fractions of CO and CO2of products, the effects of injection strategies on regeneration were analyzed. Results show that segmented injection strategies change the axial temperature distribution, leading to a temperature rise in front part of the EGR cooler and a drop in back part. Volume fractions of CO under different strategies are lower than those of CO2, and show a similar trend. In general, the regeneration effects with segmented injection strategies are more remarkable than that with non-segmented injection strategy because of a higher utilization of NTP, among which strategy 4 whose branch flows gradually decline is the most effective and its deposit removal weight is 2.42 g, twice as much as that with non-segmented injection strategy. ? 2015, Chinese Society for Internal Combustion Engines. All right reserved.