Experimental investigation on unstart-restart hysteresis of a supersonic inlet during throat regulation  

作　　者：Yi JIN Huijun TAN Hao ZHANG Gaojie ZHENG Shu SUN Yue ZHANG 

机构地区：[1]Jiangsu Province Key Laboratory of Aerospace Power System,College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]Aerospace Times Feipeng Company Limited,China Academy of Aerospace Electronics Technology,Kunshan 215000,China

出　　处：《Chinese Journal of Aeronautics》2023年第11期135-152,共18页中国航空学报（英文版）

基　　金：This work was co-funded by the National Natural Science Foundation of China(Nos.U20A2070,12025202,and 12172175);the National Science and Technology Major Project,China(No.J2019-II-0014-0035).

摘　　要：The hysteresis during the throat regulation process of a supersonic variable inlet is unconducive to restart.Hence,detailed experimental studies of such a hysteresis and its control are necessary.A throat variable supersonic inlet was designed at a shock-on-lip Mach number of 4.0 and an Internal Contraction Ratio(ICR)ranging over 1.21–2.94.Meanwhile,a distributed bleed system was proposed to suppress the hysteresis.The wind tunnel tests were conducted at Mach number 2.9.The throat regulation processes were recorded using a high-speed schlieren and dynamic pressure acquisition system.The results indicate that the unstart and restart ICRs during the uncontrolled inlet’s throat regulation process were 1.95 and 1.48,respectively,demonstrating an unstart-restart hysteresis.Four typical flowfields were summarized during the uncontrolled inlet’s restart process.The proposed bleed control increased the unstart and restart ICRs to 2.06 and 1.75,respectively,and the inlet realized the designed state as the ICR was further decreased to 1.67.The controlled inlet’s hysteresis loop was decreased compared to the uncontrolled inlet.Finally,the mechanism of the hysteresis,dominated by the entrance separation-induced wave system,was clarified.The mechanisms of the bleed control to broaden the unstart and restart boundaries and suppress the hysteresis were elucidated.

关 键 词：Supersonic inlet Unstart-restart hysteresis Bleed control Throat regulation process Wind tunnel test 

分 类 号：O35[理学—流体力学]