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Investigation of impingement-film composite anti-icing on a rotating spinner.

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Title:	Investigation of impingement-film composite anti-icing on a rotating spinner.
Authors:	Hu, Yaping¹ (AUTHOR) hyp@nuaa.edu.cn, Zheng, Weiliang¹ (AUTHOR), Wu, Chen¹ (AUTHOR), Fan, Yuxin¹ (AUTHOR), Du, Yaxin¹ (AUTHOR), Yuan, Haoyu¹ (AUTHOR), Zhang, Tianyi² (AUTHOR), Jing, Shuliang¹ (AUTHOR)
Source:	Aerospace Science & Technology. Jul2026, Vol. 174, pN.PAG-N.PAG. 1p.
Subjects:	Ice prevention & control, Rotors, Icing (Meteorology), Computer simulation, Aerospace engineering, Heat transfer, Empirical research
Abstract:	• Experimental investigation of anti-icing performance for a full-scale rotating spinner at high rotational speeds in an icing wind tunnel. • Revealing the mechanism of impingement-film composite anti-icing in a rotating spinner using a combined experimental and numerical approach. • The role of spinner rotation in enhancing impingement-film anti-icing performance through improved heat transfer and hot-air film adherence. The impingement-film composite anti-icing provides higher heating efficiency and significant application potential for aircraft compared to conventional hot-air anti-icing. While prior studies have focused on stationary components, this study investigates the anti-icing performance of a full-scale rotating spinner via a combined experimental and numerical approach at high rotational speeds. Surface temperature was measured using a calibrated infrared thermal imager, while water film flow and ice evolution were captured with a high-speed camera. The numerical model couples external and internal airflow, heat transfer, surface water film dynamics with phase change, and solid conduction. Results indicate that the surface temperature initially rises slightly and then decreases, peaking near the fourth row of film holes. Predicted surface temperatures agree well with the experimental data within the uncertainty bands, yielding a mean absolute error of 1.5°C. The composite anti-icing mechanism is attributed to the combined effects of internal hot-air impingement heating and an external protective film formed by the ejected hot air, which simultaneously heats the surface and suppresses droplet impingement. Under the studied conditions, the rotating spinner remains fully protected at freestream temperatures slightly above −10°C. At −20°C, a continuous annular runback ice layer forms downstream of the film-hole region, with a maximum thickness of approximately 15 mm. In contrast, a stationary spinner under identical conditions exhibits an average surface temperature about 2.3°C lower, a larger ice accretion area, and a maximum ice thickness of 20 mm. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	• Experimental investigation of anti-icing performance for a full-scale rotating spinner at high rotational speeds in an icing wind tunnel. • Revealing the mechanism of impingement-film composite anti-icing in a rotating spinner using a combined experimental and numerical approach. • The role of spinner rotation in enhancing impingement-film anti-icing performance through improved heat transfer and hot-air film adherence. The impingement-film composite anti-icing provides higher heating efficiency and significant application potential for aircraft compared to conventional hot-air anti-icing. While prior studies have focused on stationary components, this study investigates the anti-icing performance of a full-scale rotating spinner via a combined experimental and numerical approach at high rotational speeds. Surface temperature was measured using a calibrated infrared thermal imager, while water film flow and ice evolution were captured with a high-speed camera. The numerical model couples external and internal airflow, heat transfer, surface water film dynamics with phase change, and solid conduction. Results indicate that the surface temperature initially rises slightly and then decreases, peaking near the fourth row of film holes. Predicted surface temperatures agree well with the experimental data within the uncertainty bands, yielding a mean absolute error of 1.5°C. The composite anti-icing mechanism is attributed to the combined effects of internal hot-air impingement heating and an external protective film formed by the ejected hot air, which simultaneously heats the surface and suppresses droplet impingement. Under the studied conditions, the rotating spinner remains fully protected at freestream temperatures slightly above −10°C. At −20°C, a continuous annular runback ice layer forms downstream of the film-hole region, with a maximum thickness of approximately 15 mm. In contrast, a stationary spinner under identical conditions exhibits an average surface temperature about 2.3°C lower, a larger ice accretion area, and a maximum ice thickness of 20 mm. [ABSTRACT FROM AUTHOR]
ISSN:	12709638
DOI:	10.1016/j.ast.2026.111878