Abstract
The oil tracer injection method was applied to measure the velocity profiles of a swirling water flow in the presence of a vortex breakdown. Droplets of kerosene mixed with white paint were used as the tracer particles, and photographs of their loci were taken with the help of a stroboscope in order to determine the velocity. Axial and swirl velocity profiles were measured for three types of vortex breakdown, viz. triangular sheet, axisymmetric and spiral types, from the inlet section of the test pipe to the position of breakdown. It was found that in the cases of the axisymmetric and spiral types the break- down was preceded by an abrupt deceleration near the axis, and was characterized by a stagna- tion point on the axis, while in the triangular sheet case the axial velocity profile was nearly uniform at the position of breakdown.In addition, the type and position of breakdown were observed by color tracer injection method. When the swirl ratio was kept constant at the inlet section of the test pipe, the position of breakdown was found to shift downstream with an increase of the REYNOLDS number.
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