Open AccessExperimental influence of a splitter vane on the flow fields in a wide-angled diffuser
Author(s) -
Min Guo,
Xv Meng,
Zhigang Zuo,
Shuhong Liu
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/774/1/012051
Subject(s) - diffuser (optics) , splitter , reynolds number , mechanics , flow separation , flow (mathematics) , separation (statistics) , materials science , optics , vorticity , geometry , geology , vortex , turbulence , physics , mathematics , light source , statistics
Based on PIV and high-speed photography technology, the lengths and area ratios of flow separation zone under different Reynolds numbers Re in a diffuser with a fixed angle (28º), with and without a splitter vane were obtained. The flow field, vorticity and the flow distribution (hydrogen bubble tracing) at the downstream vicinity of the outlet of the diffuser under three representative conditions ( Re = 1000, 6000 and 12000) were given. The experimental results show that with increasing Re , the area proportion of the separation zone decreases, but the length proportion of the separation zone increases, because the thickness of the separation zone along the vertical flow direction is reduced. Due to the existence of vane, the area of the corresponding separation zone is always smaller than that without the vane.