Blade solidity and aspect ratio are the two geometrical parameters that bridge the preliminary sizing of the fan with the aerodynamic design of the blade. In a previous work, the present authors started investigating the topic with a comprehensive experimental campaign focused on 16 Propeller fan design variants with 0.2 hub-to-tip ratio, all designed for best efficiency operation at approximately 0.075 flow rate coefficient and 0.008 pressure coefficient. As further step of the research, this paper investigates by experiments the influence of blade solidity and aspect ratio on the global aerodynamic performance of 0.5 hub-to-tip ratio tube-axial fan rotors designed for best efficiency operation at approximately the same flow rate coefficient as the 0.2 hub-to-tip ratio fans studied in the previous research. Aim of the work is twofold: first, to extend the experimental data set of aerodynamic performance of comparable axial-flow industrial fan designs characterised by different blade solidity and aspect ratio; second to investigate the role of the hub-to-tip ratio on the effects of the two design parameters. To this end, 18 additional fan design variants were designed and tested in accordance with the ISO-5801 standard and the collected data were compared to the data set made available by testing the original 16 design variants. The results confirm that the global aerodynamic performance of a fan design at best efficiency operation is primarily set by the hub-to-tip ratio. Solidity plays a role comparable to the hub-to-tip ratio only within the minimum to low solidity range, whereas the aspect ratio contributes to the definition of the fan efficiency, in designs with high hub-to-tip ratio only, and the flow rate coefficient at best efficiency operation, in designs with low hub-to-tip ratio only.
EFFECTS OF BLADE SOLIDITY AND ASPECT RATIO ON A 0.5 HUB-TO-TIP RATIO TUBE-AXIAL FAN
M. Masi
;P. Danieli
2025
Abstract
Blade solidity and aspect ratio are the two geometrical parameters that bridge the preliminary sizing of the fan with the aerodynamic design of the blade. In a previous work, the present authors started investigating the topic with a comprehensive experimental campaign focused on 16 Propeller fan design variants with 0.2 hub-to-tip ratio, all designed for best efficiency operation at approximately 0.075 flow rate coefficient and 0.008 pressure coefficient. As further step of the research, this paper investigates by experiments the influence of blade solidity and aspect ratio on the global aerodynamic performance of 0.5 hub-to-tip ratio tube-axial fan rotors designed for best efficiency operation at approximately the same flow rate coefficient as the 0.2 hub-to-tip ratio fans studied in the previous research. Aim of the work is twofold: first, to extend the experimental data set of aerodynamic performance of comparable axial-flow industrial fan designs characterised by different blade solidity and aspect ratio; second to investigate the role of the hub-to-tip ratio on the effects of the two design parameters. To this end, 18 additional fan design variants were designed and tested in accordance with the ISO-5801 standard and the collected data were compared to the data set made available by testing the original 16 design variants. The results confirm that the global aerodynamic performance of a fan design at best efficiency operation is primarily set by the hub-to-tip ratio. Solidity plays a role comparable to the hub-to-tip ratio only within the minimum to low solidity range, whereas the aspect ratio contributes to the definition of the fan efficiency, in designs with high hub-to-tip ratio only, and the flow rate coefficient at best efficiency operation, in designs with low hub-to-tip ratio only.
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