Study of Influence of Boundary Condition of Diffuser with Non-Uniform Velocity on the Jet Characteristics and Indoor Flow Field

In practice, the outflow from a diffuser is highly non-uniform due to many reasons. However, air velocity uniform in most current studies. Little research has been conducted determine under what conditions can be used. Therefore, based on non-uniformity of velocity, airflow characteristics grille and ceiling diffusers were investigated experimentally numerically. Two generic CFD cases (non-uniform velocity) are presented. The field near with measurements order velocity-inlet boundary conditions. study shows that condition considered accurate only certain For diffuser, aspect ratio affects distribution velocity. Using as for would result at least 14.2% error jet region, except when 1 average greater than 1.83 m/s. 3.64 m/s, using reaches 58.3%. This provides basis determining during numerical simulations.