Investigations of the Aerodynamic Characteristics of Shock Tubes : 2nd Report, On the Formation of Shock Waves

In the present work, high-pressure hydrogen is released to air through a circular tube and shock formation process has been studied using various diaphragms separating the high-pressure hydrogen from an ambient air. To improve reproducibility of diaphragm rupture, the diaphragms were scored by precisely controlling the depths of score. The rupturing process of the ruptured diaphragm was visualized by a high-speed camera so that opening ratio of the diaphragm was estimated. As a result, the rupture pressure can be obtained with good reproducibility by selecting appropriate diaphragm material and the depth of score. Thus opening process of rupturing diaphragm and shock formation can be well controlled. The opening ratio of diaphragms was predicted by a modified equation based on previous tests of diaphragm opening in rectangular tubes. In addition, higher opening rate of diaphragms generates a stronger shock wave, whereas smaller opened area leads to a weaker shock wave.

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Effects of opening process of diaphragm on shock strength in a circular tube

Kaneko

Yoshihara

Ishii

2016

Transactions of the JSME (In Japanese)

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Investigations of the Aerodynamic Characteristics of Shock Tubes : 2nd Report, On the Formation of Shock Waves

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Effects of opening process of diaphragm on shock strength in a circular tube

Effects of opening process of diaphragm on shock strength in a circular tube

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