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首页> 外文期刊>Geophysical Research Letters >Particle nucleation by recondensation in combustion exhausts
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Particle nucleation by recondensation in combustion exhausts

机译：燃烧废气中的再凝结使颗粒成核

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Observational and experimental evidence is presented here to verify a hypothesized 'recondensation-induced' nucleation mechanism. While analyzing the diurnal variations in particle number concentration in an urban area, intense particle production was found to occur during the commuting hours even when there was no significant photochemical activity. Combustion-induced nucleation processes occurring in fresh automobile exhausts are believed to be responsible for the observed phenomenon. It is hypothesized that, besides the more familiar fuel-sulfur conversion mechanism, particle nucleation may also result from the recondensation of chemicals vaporized from preexisting particles in the intake air during combustion. An experimental verification was performed by heating the ambient air without the use of fuel, then cooling it down to allow for nucleation. A net particle production of over 700,000 cm~(-3) was achieved during this heating-then-cooling procedure. The results indicate that the recondensation-induced mechanism is potentially important in various types of combustion exhausts.
机译：本文提供了观察和实验证据，以验证假设的“再凝结诱导”成核机制。在分析市区颗粒物浓度的日变化时，即使没有明显的光化学活性，在通勤期间仍会产生大量颗粒。据认为，在新鲜汽车尾气中发生的燃烧诱导的成核过程是造成观察到的现象的原因。据推测，除了更熟悉的燃料-硫转化机理外，颗粒成核也可能是由于燃烧过程中进气中预先存在的颗粒汽化的化学物质的再冷凝所致。通过在不使用燃料的情况下加热环境空气，然后将其冷却以允许成核，进行了实验验证。在该加热-然后-冷却过程中，产生了超过700,000cm 3（-3）的净颗粒产量。结果表明，再冷凝诱导的机理在各种类型的燃烧废气中潜在重要。

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