Effects of tip clearance and impeller geometry on the performance of semi-open ceramic centrifugal fan impellers at elevated temperatures

Design, testing and two-dimensional flow modeling of a multiple-disk fan

“…(2) solvable, the local wall shear stress must be expressed in terms of u h as done for s w in Eq. (5). The Fanning friction factor can be regarded (or assumed) as an isotropic quantity in the gap, e.g., it is constant in all directions at a particular radial location.…”

“…The three-dimensionally optimized steel fan impellers can be safely operated at the temperatures up to 800°C. On the other hand, the mechanical strength of the steel materials drops drastically due to both high temperatures exceeding 600°C and increased centrifugal forces acting on the impeller blades [5]. In the case of such high temperature gases, the priority is generally to convey the gas rather than expectation of high performance characteristics, and two-dimensional multiple-disk fans are best fit to those applications.…”

Losses and blade tip clearance for a centrifugal compressor

“…casting and the tip of the blade due to the pressure differences at the blade tip [1]. The boundary layer separation on the blade leads to greater tip leakage, therefore optimization of both blade angles and end wall geometry is required [2], [3].…”

Influence of Tip Clearance on Pressure Fluctuation in Low Specific Speed Mixed-Flow Pump Passage

“…In recent years, research has been conducted on the influence of tip clearance on performance [5,6], pressure fluctuation [7][8][9] and internal flow of pumps [10,11], but the subjects have mainly been centrifugal pumps and axial pumps. For mixed-flow pumps, related research has mainly concentrated on the influence of clearance size on performance parameters and tip-leakage.…”