Pressure recovery performance of 2-D turning diffuser by varying area ratios and inflow Reynolds numbers

2nd International Conference on Computational Fluid Dynamics in Research and Industry

力学;计算机科学;工业技术

Ruzaini, M.S.^1 ; Nordin, N.^1 ; Sadikin, A.^1 ; Mohammed, A.N.^1 ; Sapit, A.^1 ; Abdullah, K.^1 ; Ramli, Y.^1 ; Idris, A.F.^1

Flow Analysis, Simulation and Turbulence Research Group, Center for Energy and Industrial Environment Studies, Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia^1

关键词: Area ratios;    Digital manometers;    Entrance length;    Optimum configurations;    Particle image velocimetries;    Pressure recovery;    Pressure recovery performance;    Static pressure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/243/1/012029/pdf
DOI  :  10.1088/1757-899X/243/1/012029

来源: IOP

【 摘 要 】

The paper aims to investigate the effects of varying area ratio, AR = 1.2 and 4.0 and inflow Reynolds number, Rein= 5.478 104- 1.547105on the performance of 90° two-dimensional turning diffuser. The optimum configuration area ratio and Reinto produce good pressure recovery is determined. The rig was developed to produce fully developed entrance flow by adopting arrangement of mesh net and sufficient hydrodynamic entrance length, Lh, turb= 28 Dh. Digital manometer was used to measure the inlet and outlet static pressures and Particle Image Velocimetry (PIV) to visualize the flow structure. The present results were compared with empirical solution of Asymptotic Computational Fluid Dynamics (ACFD) results to give acceptable deviation of ±7.4%. The AR=4.0 produces pressure recovery 20% more than AR=1.2 when applies low Rein5. However, it is subjected to severe flow separation and circulation at Rein>1.40 105that considerably disturbs the recovery. Therefore, turning diffuser of AR=1.2 is optimum applied for high Rein>1.40 105.