Ayedh Alajmi


2 Numerical Simulation of Two-Dimensional Porous Cylinder Flow in In-Line Arrangement

Authors: M. H. Alhajeri, A. H. Alenezi, Abdulrahman Almutairi, Ayedh Alajmi, Hamad Alhajeri


The flow around three porous cylinders in inline arrangement is investigated in this paper computationally using the commercial code FLUENT. The arrangement generally operates with the dirty gases passing through the porous cylinders, the particulate material being deposited on the outside of the cylinders. However, in a combined cycle power plant, filtration is required to allow the hot exhaust gases to be fed to a turbine without causing any physical damage to the turbine blades. Three cylinder elements are placed in a two-dimensional rectangle duct with fixed face velocity and varying the velocity ratio between the approach and face velocity. Particle trajectories are obtained for a number of particle diameters and different inlet (approach) velocity to face filtration velocity ratios to investigate the behavior of particles around the cylinder.

Keywords: CFD, fluid flow, Filtration, porous cylinders

Procedia PDF Downloads 304
1 Fluid Flow in Roughened Square Tube for Internal Blade Cooling

Authors: M. H. Alhajeri, A. H. Alenezi, Hamad M. Alhajeri, Abdulrahman Almutairi, Ayedh Alajmi


A computational investigation has been undertaken to study fluid flow through roughened tube with turbulators. Such flows are of particular interest in cooling internally high pressure turbine blades. Turbulators are fixed in each side of the passage (tube) to promote turbulence and enhance heat transfer. The tube had an aspect ratio of 1 and the position of the ribs closest to the bend are at 0.45d from the entrance and exit of the bend. The aim of this study is to examine the tube roughened by turbulator by studying some flow parameters upstream and downstream of the turbulator. It is cleared that the eddies sizes are decreased downstream in the first two turbulators and increased after the turbulators increases the turbulence in the tube and enhanced the heat transfer in the blade.

Keywords: Computation, fluid flow, blade, turbulator

Procedia PDF Downloads 129