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首页> 外文会议>FISITA World Automotive Congress >GENERATION AND DISTRIBUTION BEHAVIOR OF NANO PARTICLES IN EXHAUST PIPE AND DILUTION PROCESS
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GENERATION AND DISTRIBUTION BEHAVIOR OF NANO PARTICLES IN EXHAUST PIPE AND DILUTION PROCESS

机译：纳米粒子在排气管和稀释过程中的产生和分布行为

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Recently particulate matter (PM) emission from internal combustion engines especially from the diesel engines is becoming a sever problem. Specially, particles having diameter of less than 100 nm are usually called as Nano-particle are considered to be seriously hazardous for human health. Due to very smaller in size these nano-particles are very difficult to measure by the conventional gravimetric measurement system with sampling in a filter paper. More over it is assumed that more attention should be given to the effect of number and surface area of nano-particles to human health rather than to the effect of total mass of PM. However, emission behaviour of nano-particles, especially the Nuclei-mode of nano-particles having diameter less than 30 nm is very sensitive to the engine operating condition, measurement conditions and others. Therefore motivation of this research is to confirm the behaviour of nano-particles emitted from engine and recommendation of a precise measuring method for nano-particles. Measurements of nano-particles emitted from an 8 little DI diesel engine with common rail injection system were performed at four different points from the exhaust pipe upstream (just behind the turbo charger) to the exit of the full dilution tunnel. Number distribution of nanoparticles was measured by SMPS, ELPI and NanoMet type measuring systems. A rotary type or an ejector type diluter was used for measurement of high concentration and high temperature exhaust gas at the upstream part of the exhaust pipe. It was found that, generation of the nuclei mode particles having the peak at 10 nm size increases with decreases in the exhaust gas temperature. Particle number concentration during accumulation mode does not depend on exhaust gas temperature. But the nucleation mode particle generation at the low temperature upstream region becomes higher and the number concentration decreases with increases in the exhaust gas temperature. Especially the concentration of nano-particles generated at the upstream part does not vary even when travelling to the low temperature downstream part of the exhaust pipe. Generation of nuclei mode particles is significantly influenced by the cooling history of the exhaust gas just after the exhaust valve.
机译：最近颗粒物（PM）尤其是来自柴油发动机的内燃机发射正在成为一种切断问题。特别地，具有小于100nm的直径的颗粒通常被称为纳米粒子被认为对人类健康严重危害。由于尺寸非常较小，这些纳米颗粒非常难以通过在滤纸中采样采样的传统重量测量系统来测量。更多的是假设应更加关注纳米颗粒对人体健康的数量和表面积的影响，而不是PM总质量的影响。然而，纳米颗粒的排放行为，特别是具有直径小于30nm的纳米颗粒的核模式对发动机操作条件，测量条件等非常敏感。因此，该研究的动机是确认从发动机发出的纳米颗粒的行为和用于纳米颗粒的精确测量方法的推荐。从8个小柴油发动机发射的纳米颗粒的测量与共轨注射系统的四个不同点，从排气管上游（涡轮充电器后面）到完全稀释隧道的出口。通过SMP，ELPI和纳米型测量系统测量纳米颗粒的数量分布。旋转式或喷射器型稀释剂用于测量排气管上游部分的高浓度和高温废气。发现，在10nm尺寸下产生峰值的核模式颗粒随着废气温度的降低而增加。累积模式期间的粒子数浓度不依赖于废气温度。但是低温上游区域的成核模式颗粒产生变得更高，并且数量随着废气温度的增加而降低。特别是在上游部分处产生的纳米颗粒的浓度即使在排气管的低温下游部分行驶时也不会变化。核模式颗粒的产生受排气阀之后的废气的冷却历史的显着影响。

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