JSME International Journal Series B Fluids and Thermal Engineering
Online ISSN : 1347-5371
Print ISSN : 1340-8054
ISSN-L : 1340-8054
Measurements of Surface Pressure Distributions on a Freely Falling Sphere with a Tripping Wire
Yasuo IkushimaWei Wang GuoMichio Ohji
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1993 Volume 36 Issue 2 Pages 272-278


The effect of a tripping wire on a sphere in free fall has been investigated. The test sphere is of 1OOmm in diameter, and is equipped with built-in processors, such as a pressure sensor, a tension sensor, an amplifier, a memory, a power supply and a CPU. The tripping wire was formed by a ring of enptyv1mm wire attached to the surface at angles of θγ=25° and 55°, respectively, measured from the stagnation point. In the case of θγ=25°, the pressure distributions were nearly the same as those on a smooth sphere. In the case of θγ=55°, on the other hand, the effects of the tripping wire were striking, indicating a laminar-turbulent transition of the boundary layer at Re≒5×104.

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© The Japan Society of Mechanical Engineers
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