Publication: Experimental study of thermal performance of an acoustic liner
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Date
2023-07-01
Authors
Nur Dahlia Shafiqah Binti Dolah
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Abstract
Ice formation on aircraft surfaces has long been acknowledged as a potential threat to
aerodynamics and flight mechanics, endangering flight safety. To address this issue, hot
air jet impingement has been utilised for eliminating ice from critical regions such as
the nacelle lip skin. However, experimental data on the thermal performance of the
acoustic liner, a material commonly used for noise reduction techniques in proximity of
the nacelle lip skin, is still lacking. Consequently, this study investigates the thermal
efficacy of Acoustic Liner. In general, the study's results were consistent across all
evaluated conditions. Ten average free stream velocities ranging from 0.6 m/s to 2.2 m/s
and ten heat dissipations varying from 0.1686 W to 2.6765 W were examined. The
Reynolds number recorded during the investigation ranges between 4800 and 15600.
The corresponding temperature readings and velocities for this experiment were
obtained using thermocouples, a data recorder, and an anemometer, with total
systematic and random error uncertainties of 4.3684%. Graphs depicted the relationship
between the overall convection heat transfer coefficient and the Reynolds number, the
Nusselt Number and the Reynolds number, and the Nusselt Number multiplied by the
Prandtl number and Reynolds number. As the Reynolds number increased, all graphs
showed an increase. In conclusion, the acoustic liner demonstrates efficient thermal
performance, making it a useful resource for reducing the formation of frost on the
nacelle lip skin, where flows with a higher Reynolds number are found to enhance the
thermal effectiveness of the acoustic liner. These findings contribute to a better
comprehension of the performance of the acoustic liner as well as its use in preventing
the formation of ice on aircraft surfaces.