论文标题
洞悉微型冲击管中的冲击波衰减
Insights into the shockwave attenuation in miniature shock tubes
论文作者
论文摘要
微型冲击管正在发现在各种跨学科应用中越来越重要。缺乏实验数据来验证现有的冲击管流量模型，这些模型解释了压力驱动的微型冲击管中的冲击波衰减。本文洞悉了2mm，6mm和10mm平方的微型电击管中的冲击形成和冲击传播现象，该管子在5-25范围内以diaphragm破裂压力比以隔膜破裂压力比进行操作，最初在环境条件下驱动部分。压力测量和可视化研究是在新的微型台式电击管系统中使用氮气和氦气作为驱动器气体进行的。使用两个区域的冲击管模型对实验发现进行了验证。 （1）由于隔膜的有限破裂时间而导致的波相互作用，冲击形成区域。 （2）冲击传播区域，其中冲击波衰减主要是由于壁效应和边界层生长。预测冲击形成区域中的冲击马赫数和冲击传播区域的相关性对于文献中报道的当前发现和实验数据都很好。在相同无量纲的时间戳记的冲击管中观察到类似的流动特征。平面冲击前尺度的形成与冲击管的直径成比例。随着冲击管直径的增加，冲击波达到的峰值马赫数更高。
Miniature shock tubes are finding growing importance in a variety of interdisciplinary applications. There is a lack of experimental data to validate the existing shock tube flow models that explain the shockwave attenuation in pressure-driven miniature shock tubes. This paper gives insights into the shock formation and shock propagation phenomena in miniature shock tubes of 2mm, 6mm, and 10mm square cross-sections operated at diaphragm rupture pressure ratios in the range 5-25 and driven section initially at ambient conditions. Pressure measurements and visualization studies are carried out in a new miniature table-top shock tube system using nitrogen and helium as driver gases. The experimental findings are validated using a shock tube model explained in terms of two regions; (1) The shock formation region, dominated by wave interactions due to the diaphragm's finite rupture time. (2) The shock propagation region, where the shockwave attenuation occurs mainly due to wall effects and boundary layer growth. Correlations to predict the variation of shock Mach number in the shock formation region and shock propagation region work well for the present findings and experimental data reported in the literature. Similar flow features are observed in the shock tubes at the same dimensionless time stamps. The formation of the planar shock front scales proportionally with the diameter of the shock tube. The peak Mach number attained by the shockwave is higher as the shock tube diameter increases.
