TY - JOUR
T1 - Control of secondary flow in a low solidity circular cascade diffuser
AU - Sakaguchi, Daisaku
AU - Fujii, Takuji
AU - Ueki, Hironobu
AU - Ishida, Masahiro
AU - Hayami, Hiroshi
N1 - Funding Information:
This work was financially supported by the Harada Memorial Foundation, and the authors also would like to thank to graduate students of Energy System Laboratory, Nagasaki University.
PY - 2012/8
Y1 - 2012/8
N2 - According to the previous experimental works on the low solidity circular cascade diffuser (LSD), a pressure recovery of a centrifugal blower was improved by the LSD significantly in a wide range of flow rate, and the pressure recovery was improved further by the LSD with a tandem cascade in comparison with the LSD with a single- row cascade. In the present study, the flow behavior in the LSD with the tandem cascade has been analyzed numerically by using the commercial CFD code of ANSYS-CFX12. It was shown clearly that the higher pressure recovery was achieved by applying the LSD with the tandem cascade, and the high pressure recovery is based on the high pressure rise in the vaneless space upstream of the LSD and the high blade loading of the front blade of the LSD. The high pressure recovery in the LSD could be achieved by controlling the flow separation on the suction surface of the front blade and also on that of the rear blade due to formation of the favorable secondary flow and due to increase in mass flow passing through the slit section between the front and rear blades.
AB - According to the previous experimental works on the low solidity circular cascade diffuser (LSD), a pressure recovery of a centrifugal blower was improved by the LSD significantly in a wide range of flow rate, and the pressure recovery was improved further by the LSD with a tandem cascade in comparison with the LSD with a single- row cascade. In the present study, the flow behavior in the LSD with the tandem cascade has been analyzed numerically by using the commercial CFD code of ANSYS-CFX12. It was shown clearly that the higher pressure recovery was achieved by applying the LSD with the tandem cascade, and the high pressure recovery is based on the high pressure rise in the vaneless space upstream of the LSD and the high blade loading of the front blade of the LSD. The high pressure recovery in the LSD could be achieved by controlling the flow separation on the suction surface of the front blade and also on that of the rear blade due to formation of the favorable secondary flow and due to increase in mass flow passing through the slit section between the front and rear blades.
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U2 - 10.1007/s11630-012-0559-9
DO - 10.1007/s11630-012-0559-9
M3 - Article
AN - SCOPUS:84865677386
SN - 1003-2169
VL - 21
SP - 384
EP - 390
JO - Journal of Thermal Science
JF - Journal of Thermal Science
IS - 4
ER -