NDLI: Interaction of a shock with a sphere suspended in a vertical shock tube

Content Provider	Springer Nature Link
Author	Tan, H. Itoh, K. Saito, T. Abe, A. Takayama, K.
Copyright Year	2003
Abstract	Shock wave interaction with a sphere is one of the benchmark tests in shock dynamics. However, unlike wind tunnel experiments, unsteady drag force on a sphere installed in a shock tube have not been measured quantitatively. This paper presents an experimental and numerical study of the unsteady drag force acting on a 80 mm diameter sphere which was vertically suspended in a 300 mm x 300 mm vertical shock tube and loaded with a planar shock wave of M s = 1.22 in air. The drag force history on the sphere was measured by an accelerometer installed in it. Accelerometer output signals were subjected to deconvolution data processing, producing a drag history comparable to that obtained by solving numerically the Navier-Stokes equations. A good agreement was obtained between the measured and computed drag force histories. In order to interpret the interaction of shock wave over the sphere, high speed video recordings and double exposure holographic interferometric observations were also conducted. It was found that the maximum drag force appeared not at the time instant when the shock arrived at the equator of the sphere, but at some earlier time before the transition of the reflected shock wave from regular to Mach reflection took place. A negative value of the drag force was observed, even though for a very short duration of time, when the Mach stem of the transmitted shock wave relfected and focused at the rear stagnation point of the sphere.
Starting Page	191
Ending Page	200
Page Count	10
File Format	PDF
ISSN	09381287
Journal	Shock Waves
Volume Number	13
Issue Number	3
e-ISSN	14322153
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Unsteady drag force Drag force measurement Vertical shock tube Numerical drag simulation Negative drag force
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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