航空学报2026，Vol.47Issue(14)：32-43,12.DOI:10.7527/S1000-6893.2026.32889
Bump进气道超额定小流量失稳特性
Low-mass-flow induced instability characteristics of Bump inlet under over-speed conditions
摘要
Abstract
Severe flow oscillation induced by low-mass-flow of inlet directly threatens flight safety.The unsteady simu-lation on the low-mass-flow induced instability phenomenon of the Bump inlet under over-speed operating conditions at Ma0=1.8 is conducted.The effects of different throttling levels on the inlet is studied.The results show that when the inlet mass flow is reduced to 48%of the through-flow mass flow rate,the inlet enters a periodic surge state.Based on the flow characteristics,the instability process can be divided into three typical stages,i.e.,terminal shock expelling out of duct,backflow development,and the internal flow re-establishment.Driven by the high pressure inside the tube,the terminal shock propagates forward,with its movement speed initially decreasing and then increasing.As the terminal shock merges with the lip shock,it triggers large-scale flow separation.The interaction between this sepa-rated flow and the incoming freestream generates unsteady vortical structures,which disrupt the inlet shock system.In the later stage of the backflow development phase,significant reverse flow is observed near the inlet,and a zero-velocity interface forms in the vicinity of the outlet section.Subsequently,the pressure inside the duct gradually de-creases,allowing the internal flow field to be reestablished.As the second throat diameter decreases(corresponding to a further reduction in mass flow),the maximum pressure ratio inside the duct increases from 6.61 to 6.84,and the normalized backflow propagation distance ratio increases from 2.43 to 3.33.关键词
Bump进气道/小流量失稳/激波/边界层干扰/进发匹配/流动控制Key words
Bump inlet/low-mass-flow induced instability/shock wave/boundary layer interaction/inlet-engine match-ing/flow control分类
航空航天引用本文复制引用
陈孜昂,黄河峡,秦源,许耀宇,贾兵..Bump进气道超额定小流量失稳特性[J].航空学报,2026,47(14):32-43,12.基金项目
国家自然科学基金(12272177,12532017,U25B2085) National Natural Science Foundation of China(12272177,12532017,U25B2085) （12272177,12532017,U25B2085）
