Abstract
In this study, a novel diaphragmless shock tube driven by a driver valve system consisting of multiple air-operated valves was developed. The novel shock tube can generate shock waves with high repeatability, which are required for statistical investigations of shock waves. The main valve of the driver valve system is opened by decompressing the air in the sub-high-pressure room behind the main valve using “sub-valves”; this results in a shock wave formation inside the shock tube. Three different driver valves (driver valve with “a single solenoid sub-valve,” “a single air-operated sub valve,” and “three air-operated sub-valves”) were developed. For each of the three driver valves, the overpressure waveforms of the shock waves were measured with pressure sensors installed on the inner wall of the shock tube and in front of the open end of the shock tube. Furthermore, the shock Mach number was calculated from the overpressure behind the shock waves. The shock Mach number was the largest for the driver valve with the air-operated sub-valve(s). The standard deviation of the peak overpressure fluctuations of the shock waves ejected from the open end of the shock tube was the smallest for the driver valve with the three air-operated sub valves. From the results, it was observed that the quick opening time of the main valve realized by the multiple sub-valves increased the shock wave strength and improved the repeatability of the shock wave generation.
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Acknowledgements
We thank Profs. A. Sasoh, Y. Sakai, A. Murata, and K. Mori for their help and valuable comments to this work. Part of this work was supported by JSPS KAKENHI Grant Numbers 22K14419, 21H04589, and 18K13682.
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Inokuma, K., Maeda, T., Watanabe, T. et al. Diaphragmless shock tube with multiple air-operated valves. Exp Fluids 63, 121 (2022). https://doi.org/10.1007/s00348-022-03473-y
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DOI: https://doi.org/10.1007/s00348-022-03473-y