FLOW MAP OF A SLOT JET WITH A CYLINDER IN THE FLOW

摘要

The flow field measurements in a submerged air jet with and without a cylinder (both stationary and rotating) in the flow were made using hot-wire anemometry. The data was to be used to characterise the jet flow apparatus which were to be used in the drying of stationary and rotating cylinders and also to validate CFD predictions of the similar flow systems. The measurements were made at a range of uniformly spaced locations along each direction of three dimensional cartesian coordinate system. The results indicated that the jet flow was in three dimensional nature at large distances from the exit (L/d > 5) but could be considered as approximately two dimensional for smaller distances. Rotation of the cylinder caused significant modification in the flow behind the cylinder by leading to reduction in the size of the wake flow zone and displacement of the stagnation region from the centreline in the direction of the rotation. The simulations were made by using a CFD code, namely EasyFlow. Comparisons of the predicted data with those obtained experimentally indicated that predictions could well be trusted upon with acceptable accuracy.