Coupling effect of ventilation duct bend with diff

Authors: Ran Gao Shikuo Chen Jianxun Zhao Ying Zhang Angui Li

Publish Date: 2015/12/23

Volume: 9, Issue: 3, Pages: 311-318

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Abstract

The coupling effect of local components is common in buildings and results in energy loss and local drag This effect is significantly influenced by the shape and size of the components However only a few studies have focused on this topic The numerical simulation method of Reynolds stress model RSM is adopted in the present study to investigate the typically coupled local components of ventilation and air conditioning ducts namely the coupled bend By focusing on the core speed and segmented drag in the coupled bend this study explores the effects of aspect ratio and curvature radius on drag and core speed This study provides a theoretical basis for the design construction and operation management of local components of ventilation and air conditioning ducts Two evident corespeed reduction processes are observed in the coupled bend and its downstream With increasing curvature radius R/D the drop in core speed downstream decreases gradually in the Sshaped and Ushaped bends

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