Subject Area
Mechanical Power Engineering
Article Type
Original Study
Abstract
An experimental investigation on the performance of vane-island diffusers at highly distorted inlet flow is presented in this paper. The flow field at diffuser inlet is characterized by a high swirl number (λ=9) and unsteadiness. The design of the vanes is optimized starting from the available data in the literature for plane diffuser. The optimum pressure recovery is optimized with regard to the geometry of the interaction between impeller exit and vane leading edge (diffuser inlet). Three different vane setting angle – were investigated and their results were reported. The effect of free stream turbulence on the performance is also studied. The turbulence is generated by a set of cylindrical rods perpendicular to the flow and parallel to the diverging walls of the diffuser. The experimental results show that the vane setting angle must be considered in the performance optimization process of the Vane-island diffusers The increment of the vane setting angle by 5o over the design setting angle (based on the absolute velocity angle at exit) improves the pressure recovery by about 7 %. Also it was found that decreasing the setting angle deteriorates the diffuser performance. The experimental results has also shown that the increasing of turbulence level at diffuser inlet improves the pressure recovery
Recommended Citation
A. Rayan, M. and Mansour, H.
(2022)
"Optimization of Vane-Island Diffusers at High Swirl.,"
Mansoura Engineering Journal: Vol. 9
:
Iss.
2
, Article 10.
Available at:
https://doi.org/10.21608/bfemu.1984.221896
