Experimental study of planar shock wave interactions with dense packed sand wall
Experimental study of planar shock wave interactions with dense packed sand wall
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DOI：
10.1016/j.ijmultiphaseflow.2016.07.019
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发表时间：
2017-03-01
影响因子：
3.8
通讯作者：
Li, Jianping
中科院分区：
文献类型：
--
作者：
Lv, Hua;Wang, Zhongqi;Li, Jianping
在水平激波管内，利用平面激波冲击致密充填砂壁，研究了激波与砂壁的相互作用。入射激波马赫数为2.18 ~ 2.38。针对激波管驱动段，设计了一种新型主动破膜装置。一种用于装载颗粒的装置，通过电火花切割技术进行加工，以形成致密的填充颗粒壁。采用高速纹影成像系统和同步压力测量系统，捕获了波浪结构和粒子云速度。建立了初始驱动阶段由致密堆积颗粒到致密气固云的动态演化模型。砂墙的堵塞和渗透作用共同作用，相互影响。被砂墙阻挡的入射激波后面的高压气体像活塞一样推动着砂墙的上游向前。同时，通过砂壁渗透的高速气体将最下游层的砂向前拖拽。分别改变入射冲击强度、初始砂壁厚度和颗粒直径，研究了冲击衰减和壁加速度。增大砂粒直径或加入小直径砂粒均能显著减弱入射冲击。较小的颗粒或壁薄的颗粒在由致密堆积颗粒向致密气固云转变的过程中，会分散到更大的范围。此外，更强的入射激波可以使粒子分散到更大的区域。(C) 2016 Elsevier Ltd.版权所有。
A dense packed sand wall is impacted by a planar shock wave in a horizontal shock tube to study the shock-sand wall interaction. The incident shock Mach number ranges from 2.18 to 2.38. A novel device for actively rupturing diaphragm is designed for the driver section of the shock tube. An apparatus for loading particles is machined by the electrical discharge cutting technique to create a dense packed particle wall. High-speed schlieren imaging system and synchronized pressure measurement system are used together to capture the wave structures and particle cloud velocity. The dynamic evolution model from dense packed particles to dense gas-solid cloud at the initial driving stage is established. The blockage and permeation effects of the sand wall work together and influence each other. The high pressure gas behind the incident shock wave blocked by the sand wall pushes the upstream front of the wall forward like a piston. Meanwhile, the high speed gas permeating through the sand wall drags the sands of the most downstream layer forward. The incident shock strength, initial sand wall thickness and particle diameter are varied respectively to investigate the shock attenuation and the wall acceleration. Increasing the sands diameter or mixing in small diameter sands can significantly attenuate the incident shock. The smaller particles or the particles in thinner wall can be dispersed into a larger range in the process of transform from dense packed particles to dense gas-solid cloud. Moreover, the stronger incident shock can disperse the particles into a larger region. (C) 2016 Elsevier Ltd. All rights reserved.