B. Sajadi - Ph.D. Candidate, School of Mechanical Engineering, Sharif University of Technology
A. Mohebbian - B.Sc. Student, School of Mechanical Engineering, Sharif University of Technology
M.H. Saidi - Professor, School of Mechanical Engineering, Sharif University of Technology

The geometry of air diffusers has a key role in effective induction of airflow distribution through the indoor spaces. In this research, the airflow of swirl diffuser has been studied using computational fluid dynamics (CFD) and geometrical optimization has been done based on the results. The results show that both turning blade and slot angles have a vital role in making the ventilation airflow to swirl which leads to improve the diffuser performance. Based on the results, the optimum angle for the turning blade and slot are 32° and 55°, respectively. This study and its results are useful in gaining a better understanding about swirl diffuser airflow, the physical effects of its main geometric features, i.e. blade and slot angles, and also in design of more efficient diffusers.

Swirl diffuser, Optimization, Computational fluiddynamics (CFD)