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Dynamic melting behavior of volcanic ash subjected to thermal shock relevant to aviation hazards

文献类型：期刊论文

作者Ma, Lin2,3,4; Song, Wenjia1; Guo, Zhengfu3,4,6; Zou, Xinyu3,5; Dingwell, Donald B.2
刊名JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
出版日期2022-09-01
卷号429页码:8
ISSN号0377-0273
关键词Volcanic ash Thermal shock Melting behavior Spreading Aviation
DOI10.1016/j.jvolgeores.2022.107597
英文摘要The ingestion of volcanic ash by aircrafts is widely recognized as a potential hazard for aviation. By melting, adhering, and spreading, ash can permanently damage the thermal barrier coatings in jet engines; consequently, it is important to investigate the melting behavior of volcanic ash. Previous work has concentrated on the relatively isothermal process of melting at a slow heating rate using "characteristic temperatures" identified according to different geometrical characteristics. Characteristic temperatures serve well as the parameters to quantify the successive and continuous melting processes of volcanic ash under the approximately homogeneous isothermal condition. However, when the ash is ingested by a jet engine, there are large and transient thermal gradients, which differs from the near absence of temperature gradients induced in a sample throughout slow and constant heating. Therefore, experiments using slow heating rates and characteristic temperatures are limited in their utility, and new techniques are required. Here, we designed a thermal shock experiment to better reproduce the conditions of volcanic ash encountering a jet engine and proposed three characteristic times to discretize and quantify the continuous melting process of volcanic ash under thermal shock conditions. Three characteristic times are characterized by shape transitions of the specimens to spherical (St1), to hemispherical (Ht2), and to flow state (Ft3). Ash sampled from Eyjafjallajo center dot kull volcano, Iceland, was compacted into cylinders with diameters of 1-3 mm, and then thermally shocked to a target temperature of 1251, 1296, 1341, 1384 or 1427 degrees C. The three characteristic times follow exponential functions of the target temperature. Additionally, in the sintering regime, a retardation of densification was exhibited in the smaller cylinder employed here, whereas the subsequent spreading process was enhanced, resulting in a positive correlation between the size of the volcanic ash cylinder and the characteristic times in the spreading phase. We present a universal empirical function for the hemispherical state involving dimensionless target temperature and the ash's thermal properties. The function provides a fundamental basis for a dynamic melting timescale predicting model for yet smaller volcanic ash particles under even more intense transient thermal loading conditions than those studied here.
WOS关键词FGM CYLINDRICAL PLATES ; AGGREGATION ; CERAMICS
资助项目VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs)[89705] ; Chinese Academy of Sciences[XDB26000000] ; ERC-2018-ADG Grant[834225]
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000814556400004
资助机构VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; VolkswagenStiftung on "Volcanic Ash Deposition in Jet Engines" (VADJEs) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant ; ERC-2018-ADG Grant
源URL[http://ir.iggcas.ac.cn/handle/132A11/105896]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Song, Wenjia; Guo, Zhengfu
作者单位1.Beihang Univ, Sch Mat Sci & Engn, Xueyuanstr 37, Beijing 100191, Peoples R China
2.Ludwig Maximilians Univ Munchen, Dept Earth & Environm Sci, Theresienstr 41, D-80333 Munich, Germany
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
6.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
推荐引用方式
GB/T 7714		 Ma, Lin,Song, Wenjia,Guo, Zhengfu,et al. Dynamic melting behavior of volcanic ash subjected to thermal shock relevant to aviation hazards[J]. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,2022,429:8.
APA Ma, Lin,Song, Wenjia,Guo, Zhengfu,Zou, Xinyu,&Dingwell, Donald B..(2022).Dynamic melting behavior of volcanic ash subjected to thermal shock relevant to aviation hazards.JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,429,8.
MLA Ma, Lin,et al."Dynamic melting behavior of volcanic ash subjected to thermal shock relevant to aviation hazards".JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH 429(2022):8.

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来源：地质与地球物理研究所

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