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Träfflista för sökning "LAR1:ltu srt2:(1980-1989);srt2:(1987);pers:(Gustafsson Göran)"

Sökning: LAR1:ltu > (1980-1989) > (1987) > Gustafsson Göran

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1.
  • Gustafsson, Göran (författare)
  • Experiments on shock-wave focusing in an elliptical cavity
  • 1987
  • Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 61:11, s. 5193-5195
  • Tidskriftsartikel (refereegranskat)abstract
    • Experimental work on reflection and focusing of weak cylindrical shock waves in a liquid-filled elliptical cavity is presented. The shocks are generated at one focus of the cavity by electrical discharges, and converge at the other focus after reflection in the cavity wall. High-speed photographs of the resulting wave system, which appears to be considerably more complex than the corresponding one in air, are shown and discussed. The results are of interest in the design of a transient water-jet generator, which utilizes the energy in the converging shock wave to produce a fast liquid jet.
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2.
  • Gustafsson, Göran (författare)
  • Focusing of weak shock waves in a slightly elliptical cavity
  • 1987
  • Ingår i: Journal of Sound and Vibration. - 0022-460X .- 1095-8568. ; 116:1, s. 137-148
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents theoretical work on the wave motion in an elliptical water jet generator. Such a device consists of a water filled elliptical cavity in which a shock wave is induced at one focus by a spark discharge. The shock converges to the other focus and via a convergent duct is allowed to reflect off a free surface of the liquid at the front of a nozzle, whereby a jet is emitted. The initial value problem of how a weak shock develops and how it is reflected from the walls of a cavity with small eccentricity is studied by using acoustic theory and a perturbation technique. In order to account for the distensibility of the wall material its admittance is introduced as a parameter. The validity of the results is extended to larger eccentricities by use of Padé approximants and by comparison with a geometrical acoustics solution to the same problem. The implications of the results on the design of the water jet generator are indicated.
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