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

Kaijun Li, Linye Song, Xinghui Zhang (), Qi Wang and Jing Hua
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Kaijun Li: School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Linye Song: School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xinghui Zhang: School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Qi Wang: School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jing Hua: School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Energies, 2023, vol. 16, issue 3, 1-17

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

Keywords: non-uniform velocity; boundary condition; CFD; diffuser; air supply opening (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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