Volcanic ash melting under conditions relevant to ash turbine interactions.
Volcanic ash melting under conditions relevant to ash turbine interactions.
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DOI：
10.1038/ncomms10795
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发表时间：
2016-03-02
影响因子：
16.6
通讯作者：
Dingwell DB
中科院分区：
文献类型：
--
作者：
Song W;Lavallée Y;Hess KU;Kueppers U;Cimarelli C;Dingwell DB
喷气发动机摄入火山灰被广泛认为对飞机运行具有潜在的致命危险。喷气发动机的典型高温（1,200–2,000°C）会引起灰烬熔化并粘附在涡轮机部件上，从而加剧了灰烬的影响。由于化学成分会影响火山灰变成液体的温度，因此火山灰之间的化学成分差异很大，因此对这种潜在危险的估计变得很复杂。在这里，根据实验，我们参数化灰分行为并开发一个模型来预测其整体成分范围的熔化和粘附条件。我们的实验结果证实，通常使用沙子或灰尘替代物完全不足以预测火山灰的行为，导致高估粘附温度，从而严重低估热危害。我们的模型可用于评估喷气发动机中火山灰的沉积概率。 火山灰对喷气发动机有害，涡轮机中的高温会导致火山灰颗粒熔化并粘附在发动机上，从而对涡轮机功能产生不利影响。在这里，作者探索了天然灰成分的范围及其在高温下的行为和影响。
The ingestion of volcanic ash by jet engines is widely recognized as a potentially fatal hazard for aircraft operation. The high temperatures (1,200–2,000 °C) typical of jet engines exacerbate the impact of ash by provoking its melting and sticking to turbine parts. Estimation of this potential hazard is complicated by the fact that chemical composition, which affects the temperature at which volcanic ash becomes liquid, can vary widely amongst volcanoes. Here, based on experiments, we parameterize ash behaviour and develop a model to predict melting and sticking conditions for its global compositional range. The results of our experiments confirm that the common use of sand or dust proxy is wholly inadequate for the prediction of the behaviour of volcanic ash, leading to overestimates of sticking temperature and thus severe underestimates of the thermal hazard. Our model can be used to assess the deposition probability of volcanic ash in jet engines. Volcanic ash is hazardous to jet engines, with high temperatures in turbines causing ash particles to melt and stick to the engine, adversely affecting turbine function. Here, the authors explore the spectrum of natural ash compositions and their behaviour and impact at high temperatures.