DefinePK

Abstract

The aim of installing baffles is to reduce or eliminate, if possible, secondary flow which exists mostly at the inner wall of the turning diffuser. Furthermore, other than distortion at the inner wall, 3-dimensional turning diffuser has secondary flow at both left and right wall. This was due to the diffusing activities which were not only in x-y direction but in y-z direction as well. Experiment on 3-dimensional turning diffuser with baffle has been conducted using airfoil baffle with AOA=17º. Present study focuses on changing angle of attack of the installed baffle and their effects on flow uniformity and pressure recovery using numerical approach. The baffle was rotated 3º clockwise and anti-clockwise resulting in AOA=20º and AOA=14º respectively. Qualitative and quantitative comparison was discussed in this paper. AOA=14º offers higher quality of flow structure as compared to AOA= 20º, but still could not surpass the performance using preliminary design baffle with AOA= 17º. The abnormality of flow in AOA=20º resulting in higher pressure loss, thus affecting pressure recovery. The optimum configuration can be developed if the effort of improving the airfoil design could be enhance in future works.