| Citation: | WU Z C，SHAN Y，ZHANG J Z，et al. Heat transfer enhancement and ejection characteristics of mixing pipe with ribs for infrared suppressor[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（6）：2009-2017 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0548
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This paper proposes an enhanced heat transfer structure with ribs on the outer mixing pipe surface of the infrared suppressor in order to lower the surface temperature of the exposed covering shelter of the helicopter infrared suppressor. The ejection and heat transfer enhancement characteristics under the ribbed structure of the infrared suppressor's mixing pipe surface are studied using a numerical simulation. The results show that the ribbed mixing pipe surface convective heat transfer is enhanced by 83%, the radiation heat transfer is reduced by 31%, and the average temperature of the covering shelter surface is reduced by nearly 7 K compared with the mixing pipe surface without rib structure. The amount of second-stage induced ambient air is increased by nearly triple, and the average temperature of the covering shelter surface is reduced by nearly 18 K when the slit-inlet area on the covering shelter is increased. The hot spot on the covering shelter vanishes when the ejector airflow can directly operate on the high-temperature surface of the covering shelter after the ejection apertures at the up and down positions of the covering shelter are increased.
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