Improvement of a free piston driver for a high-enthalpy shock tunnel |
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Authors: | K Itoh S Ueda T Komuro K Sato M Takahashi H Miyajima H Tanno H Muramoto |
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Institution: | (1) National Aerospace Laboratory, Kakuda Research Center Kimigaya, Kakuda 981-15, Japan , JP;(2) Research and Development Corporation of Japan, Kawaguchi Center Building, 1–8, Hon-cho 4-chome Kawaguchi, Saitama 332, Japan , JP;(3) Mitsubishi Heavy Industries, 10, Oye-cho, Minato-ku, Nagoya 455, Japan , JP |
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Abstract: | In order to improve the operation of a high-enthalpy free piston shock tunnel its tuned operation was studied analytically
and experimentally. First, the piston motion in the free piston driver tube was analytically solved by proposing a simple
piston/gasdynamic model, and the tuned operation condition was formulated as an eigenvalue with which the piston has sufficiently
high speed at the moment of diaphragm rupture, so as to maintain a constant driver gas pressure, and reduces its speed to
come to rest when very closely approaching the end of the driver tube. Second, the result of this analysis was validated by
its comparison with experiments which were conducted in the medium-sized free piston shock tunnel HEK installed at the NAL
Kakuda Research Center. By observing the detail of piston landing at the end of the driver tube the present tuned operation
was found to be successfully achieved with the operating condition given here. Its advantages in improving the pressure recovery
factor and in enhancing the stagnation enthalpy were successfully demonstrated.
Received 8 June 1997 / Accepted 1 October 1997 |
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Keywords: | :Hypersonic flow Free piston shock tunnel Piston motion Tuned operation |
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