High‐speed imaging, acoustic features, and aeroacoustic computations of jet noise from Strombolian (and Vulcanian) explosions
High‐speed imaging, acoustic features, and aeroacoustic computations of jet noise from Strombolian (and Vulcanian) explosions
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Strombolian（和 Vulcanian）爆炸产生的喷射噪声的高速成像、声学特征和气动声学计算
DOI：
10.1002/2014gl059925
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发表时间：
2014
影响因子：
5.2
通讯作者：
D. Gaudin
中科院分区：
文献类型：
--
作者：
J. Taddeucci;J. Sesterhenn;P. Scarlato;K. Stampka;E. Bello;J. J. P. Fernández;D. Gaudin
对斯特龙博利（意大利）、富埃戈（危地马拉）和亚苏尔（瓦努阿图）火山爆发的高速成像使人们能够看到几秒钟长的爆炸产生的压力波。从爆炸射流，波辐射与可变的几何形状，定时，和表观方向和速度。通过对压力容器内超声速脉冲射流的数值模拟，得到了爆炸射流及其波场的真实再现。从斯特龙博利的一次爆炸中获得的按比例缩放的声学信号显示出与模拟射流的频率模式非常匹配的频率模式。我们的结论是，观察到的波和爆炸的可听声都是喷流噪声，即，高速射流辐射的典型声场火山喷流噪声以前仅在大型次普林尼到普林尼喷发的次声发射中被量化。我们的综合方法使我们能够定义小规模火山爆发中超音速射流的可听射流噪声的空间和时间演变。
High‐speed imaging of explosive eruptions at Stromboli (Italy), Fuego (Guatemala), and Yasur (Vanuatu) volcanoes allowed visualization of pressure waves from seconds‐long explosions. From the explosion jets, waves radiate with variable geometry, timing, and apparent direction and velocity. Both the explosion jets and their wave fields are replicated well by numerical simulations of supersonic jets impulsively released from a pressurized vessel. The scaled acoustic signal from one explosion at Stromboli displays a frequency pattern with an excellent match to those from the simulated jets. We conclude that both the observed waves and the audible sound from the explosions are jet noise, i.e., the typical acoustic field radiating from high‐velocity jets. Volcanic jet noise was previously quantified only in the infrasonic emissions from large, sub‐Plinian to Plinian eruptions. Our combined approach allows us to define the spatial and temporal evolution of audible jet noise from supersonic jets in small‐scale volcanic eruptions.