While conventional shock tubes have a distinct advantage in dynamic calibration methods due to their inherent capability to generate pressure pulses of desired amplitude and fast rise time, they are limited to the lower levels of the pressure amplitude realization range (≤7 MPa). With the increasing need for a traceable dynamic calibration standard across wider pressure ranges, a novel technique using converging shock waves is demonstrated in this work that pushes the upper limit of the standard shock tube into the medium-high pressure range. The experiments are conducted in the shock tube facility equipped with a test section that smoothly transforms the incident plane shock into a spherical shock wave that converges, accelerates and thereby amplifies its strength many folds. The experimentally recorded pressure traces are compared with numerical simulations performed by an in-house code. Using this technique, pressure pulses with peak amplitudes in the range of 30–40 MPa, with...

中文翻译：

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关于使用会聚冲击波放大激波管中的压力

尽管传统的冲击管由于其固有的生成所需幅度和快速上升时间的压力脉冲的固有能力而在动态校准方法中具有明显的优势，但它们仅限于压力幅度实现范围的较低水平（≤7 MPa）。随着在更宽的压力范围内对可追溯的动态校准标准品的需求日益增加，这项工作中展示了一种使用会聚冲击波的新技术，该技术将标准冲击管的上限推到了中高压范围。实验是在配备有测试部分的冲击管设备中进行的，该部分可将入射平面冲击平稳地转换为球形冲击波，然后会聚，加速并因此将其强度放大许多倍。将实验记录的压力迹线与内部代码执行的数值模拟进行比较。使用这种技术，压力脉冲的峰值幅度在30-40 MPa的范围内，具有...