Development of Performance Correlations using ACFD Method for 2-D Curved Diffuser
Keywords:2-D curved diffuser, angle of turn, pressure recovery coefficient, flow uniformity, Asymptotic Computational Fluid Dynamics (ACFD)
Diffuser is a fluid mechanical device which allows the recovery of pressure energy from the fluid flow on the outlay of kinetic energy. Performance of turning diffuser is evaluated primarily by pressure recovery coefficient, ???????? and flow uniformity, ????????????????. The varying of geometrical and operating parameters could alter the performance of the diffuser. Hence, this study aims to investigate the effect of angle of turn, ???? on 2-D curved diffuser performance and to develop performance correlations. The angle of turn was varied from 30° to 180°. The evaluation for performance of the curved diffusers was done by using ANSYS Fluent with the most appropriate turbulence model of Reynolds Stress Model (RSM) added with enhanced wall treatment of ???? +=1.0. Performance correlations in terms of pressure recovery and flow uniformity were developed by implementing Asymptotic Computational Fluid Dynamics (ACFD) technique. Pressure recovery of the curved diffusers showed a declining pattern by approximately 79.5% while flow uniformity shows higher distortion up to 52.6% with the increase of angle of turn from 30° to 180°. Hence, it has been proven that the increase of angle of turn has affected the performance of curved diffuser significantly. The ACFD performance correlations has provided acceptable deviations to both CFD and experimental results.