Mechanical Engineering Journal (Apr 2020)

In-tube shock wave compression by piston effect of unsteady jet

  • Daisuke KUWABARA,
  • Hirokatsu KAWASAKI,
  • Akira IWAKAWA,
  • Akihiro SASOH,
  • Tetsuya YAMASHITA,
  • Koji TAGUCHI

DOI
https://doi.org/10.1299/mej.19-00534
Journal volume & issue
Vol. 7, no. 3
pp. 19-00534 – 19-00534

Abstract

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A high-pressure field is generated in a circular tube by introducing an unsteady jet from its open end. The head of this jet acts as a piston, driving compression waves ahead of it. The peak value of the induced overpressure is evaluated as a solution of a Riemann problem, wherein the jet head is equivalent to a piston head. The jet head of the driver gas, with a filling pressure of 400 kPa, is equivalent to a piston head moving at 160 m/s. This high-pressure generation scheme through the “piston effect” is useful for industrial applications, including filter cleaning in dust collectors, and as an interesting example of unsteady, compressible fluid dynamics.

Keywords