Abstract
High-pressure hydrogen can ignite spontaneously without any ignition sources if it leaks from the storage container or a transport pipe. The released hydrogen generates a shock wave that heats the surrounding air around the release area. As a result, the heated air is mixed with the released hydrogen, leading to self-ignition. It is well known that porous material attenuates a shock wave. In the present work, the shock wave is passed through a porous tube and attenuated so that the self-ignition is prevented. The self-ignition is detected using a photomultiplier tube and attenuation of the shock wave is confirmed by measuring the shock speed. The experimental results show that the attenuation of the shock wave is enhanced with extension of the porous tube. The porous tube set near the release position of hydrogen weakens the shock wave effectively. However, a longer porous tube that is placed near the release position of hydrogen promotes mixing between the released hydrogen and the shock-heated air, resulting in self-ignition by a weaker shock wave.
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