| Citation: | XU Chenglong, YANG Linlin, XIE Wenzhong, et al. Influence of backflow duct on the buzz of two-dimensional hypersonic inlet[J]. Journal of Aerospace Power, 2025, 40（9）：20240340 doi: 10.13224/j.cnki.jasp.20240340
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The impact of backflow ducts on buzz in a two-dimensional hypersonic inlet was studied. The influence mechanisms of different backflow duct configurations were analyzed through unsteady numerical simulations. The results indicated that placing a backflow duct on the lower wall of the internal contraction section generated a weak compression system and expansion waves at the outlet, causing the external compression wave to shift outward, which increased spillage and alleviated airflow accumulation. This, in turn, suppressed downstream back-pressure growth and significantly reduced pressure fluctuations in the contraction section. However, the suppression effect on high-amplitude pressure fluctuations in the isolator section was limited. Placing a backflow duct on the lower wall of the isolator primarily curbed the forward movement of the terminal shock, reducing high-amplitude pressure fluctuations in the mid-region of the isolator. The combined layout of both backflow ducts effectively reduced pressure fluctuations throughout the entire inlet, with root mean square values in the contraction and isolator sections decreasing by up to 43.7% and 58.7%, respectively.
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