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Modelling aerosol deposition rates on aircraft and implications for pollutant accumulation and corrosion

机译：模拟飞机上的气溶胶沉积速率及其对污染物积累和腐蚀的影响

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Although corrosion of airframes is a major issue for both commercial and military air fleets, little work has been carried out on how the pollutants that promote corrosion on airframes are deposited (particularly in flight). In this study, a model has been developed that defines the efficiency of aerosol deposition on the leading edges of aircraft as a function of both aerosol size and airspeed. Deposition only occurs with aerosols in the medium size range, with small aerosols remaining in the airstream and large aerosols depositing on but then splashing off an airframe. However, the size range of particles that are deposited decreases with increasing airspeed. Modelling indicates that aerosols in the size range that can readily deposit in flight will remain stable on an airframe and will not be readily blown off. This knowledge of aerosol deposition efficiency enables calculations of total in-flight depositions while factoring in different locations, types of flights and environmental severity. It is estimated that deposition in flight through clouds may be quite significant, as cloud condensation nuclei are in a suitable range for deposition. The relative extents of aerosol deposition during flight and on ground are compared, and it is found that for certain combinations of airfield location and flight scenario, deposition during flight may be comparable to or exceed deposition on the ground.
机译：尽管机体的腐蚀对于商业和军事机队都是一个主要问题，但是关于如何促进机体腐蚀的污染物如何沉积（特别是在飞行中）的工作很少。在这项研究中，开发了一个模型，该模型将气溶胶在飞机前缘的沉积效率定义为气溶胶大小和空速的函数。沉积仅在中等尺寸范围内的气溶胶中发生，小气溶胶残留在气流中，大气溶胶沉积在机身上，但随后从机体上飞溅下来。然而，随着空速的增加，沉积的颗粒的尺寸范围减小。建模表明，在飞行过程中易于沉积的尺寸范围内的气溶胶将在机身上保持稳定，并且不容易被吹散。对气溶胶沉积效率的了解可以计算飞行中的总沉积量，同时考虑到不同的位置，飞行类型和环境严重性。据估计，通过云的飞行中的沉积可能非常重要，因为云凝结核处于适合沉积的范围内。比较了飞行期间和地面上气溶胶沉积的相对程度，发现对于飞机场位置和飞行情景的某些组合，飞行期间的沉积可能与地面上的沉积相当或超过。

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  • 来源
    《Corrosion Engineering, Science and Technology》 |2009年第5期|332-339|共8页
  • 作者

    Cole I.S.; Paterson D.A.;

  • 作者单位

    CSIRO Materials Science and Engineering, PO box 56, Highett, Victoria 3190, Australia, Email: Ivan.Cole@csiro.au;

    CSIRO Materials Science and Engineering, PO box 56, Highett, Victoria 3190, Australia;

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