2 research outputs found
Effect of Employing Vortex Generator on Curve Diffuser Performance
A diffuser is commonly applied in fluid-flow engineering applications with its simplest form of expanding area in the flow direction. A curve diffuser is one of its kinds often associated with secondary flow separation, thus improvement via installing passive flow control devices such as a vortex generator is to explore. The present work aims to numerically investigate the potential of four (4) types of vortex generators, i.e. triangle, rectangle, tapered, wishbone to improve the 90° curve diffuser performance. The results suggest that using vortex generators on a curve diffuser can improve performance. Triangle vortex generator provides the most optimum pressure recovery and flow uniformity of respectively 0.250 and 2.14. This promises improvement of approximately 31.3% and 25.4% relative to the benchmark case, without vortex generator
Effect of angle of turn on loss characteristics and flow rectification of curve diffuser
Curve diffuser is often used in HVAC and wind tunnel systems to provide pressure
recovery and avoid excessive energy loss to the surrounding environment.
Performance of curve diffuser is disturbed mainly by the presences of flow separation
and secondary flow vortices occurred due to the effect of turning angle, in which scarce
literature found. In this study, the effect of turning angle from 30° to 180° configured
with an area ratio of 1.60 to 4.00 and inflow Reynolds number of 5.934x104 – 1.783x105
on loss characteristics and flow rectification of curve diffuser is investigated with
optimum configuration is proposed. Performance of curve diffuser is evaluated in
terms of pressure recovery and flow uniformity using ANSYS CFD equipped with
validated Standard k-É› model (ske) and enhanced wall treatment of y+ = 1.2 - 1.7.
Results show that performance of pressure recovery and flow uniformity decreases
respectively by 85.71% and 45.84% as the angle of turn increases from 30° to 180°.
Curve diffuser with minimum angle of turn 30o
, optimum area ratio 2.16 and
intermediate Rein 8.163x104
turns out to be the best configuration to provide pressure
recovery of 0.399 and flow uniformity of 3.630 m/s