Affiliation of Author(s):能源与动力学院
Journal:AIAA J
Abstract:To greatly improve the supersonic inlet stability at low cost of structural weight and complexity, a novel buzz suppression strategy based on fixed-geometry air bleed is developed. It is designed to have plenty of narrow flush slots that are widely distributed along the compression surface. Using the natural pressure gradient varying with the terminal shock position, it is capable of creating self-adaptive bypass flow removal upstream of the internal duct. A strong stabilizing effect can be thus automatically produced on the subcritical flowfield by eliminating shock-induced separation and discharging excessively captured airflow. Simultaneously, the undesired air leakage at the critical regime can be naturally restricted to prevent a prohibitive performance penalty during normal operation. To verify the effectiveness, an external-compression inlet model is specially designed and carefully tested at freestream Mach numbers of 2.0 and 2.5 with an almost full exit throttle range considered (0–99.1%). Results indicate that the subcritical stable-flow range is remarkably extended from a throttle threshold of 53.7% to that of 86.4% and 73.7%, respectively, after the usage of the proposed bleed method. Moreover, intense flow instability is totally eliminated, even when the duct exit is almost closed. Further analysis reveals that the bleed flow rate at the near-critical state is not beyond 1% of the inlet flow rate for both freestream conditions. It actually causes no obvious loss of the inlet flow rate. Also, the following total pressure drop and drag increase are below 0.4%. Additionally, the observed unique buzz flow implies that the buzz origin is not necessarily limited to the two known sources, as opposed to the long-established understanding. © 2019 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc.
ISSN No.:0001-1452
Translation or Not:no
Date of Publication:2019-01-01
Co-author:Chen, Hao,Liu, Ya-zhou,Zhang, Qi-fan
Correspondence Author:Chen, Hao,Tan Huijun
Professor
Main positions:国家杰青获得者,两机重大专项基础研究总体组专家、中国工程热物理学会理事、装备发展部XX专业组专家、JW科技委重大项目专家组成员等
Alma Mater:南京航空航天大学
Education Level:南京航空航天大学
Degree:Doctoral Degree in Engineering
School/Department:College of Energy and Power Engineering
Discipline:Fluid Machinery and Engineering. Aerospace Propulsion Theory and Engineering
Business Address:明故宫校区10号楼
Contact Information:tanhuijun@nuaa.edu.cn
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