【作者】 李宏斌； 于时恩；

【Author】 Hong-Bin Li;Shi-En Yu;Hypervelocity Aerodynamics Institute of China Aerodynamics Research and Development Center;

【机构】 中国空气动力研究与发展中心吸气式高超声速技术研究中心；

【摘要】 隔离段位于进气道和燃烧室之间,隔离段的作用一是使超燃冲压发动机能够在双模态方式工作,二是隔离燃烧室对进气道的扰动。双模态条件下,隔离段流动以激波划分为两部分,即激波前的超声速流动和激波后的亚声速流动。针对隔离段内入流马赫数变化影响开展了研究。利用FLUENT软件和实验开展研究。研究结果表明,隔离段入口总温和总压保持不变的情况下,入流马赫数越高,等直隔离段抗干扰能力越差。低入流马赫数条件下,扩张型隔离段有一定优势,而高入流马赫数条件下,结论相反。更多还原

【Abstract】 The isolator is between the inlet and the combustor,it includes two important functions:One is to make scramjet engine work within the dual-mode,another is to provide a wide scope to inlet.In the dual-mode,isolator include two portion,supersonic flow and subsonic flow by shock wave.The CFD software FLUENT and experimental investigations on the isolator process of different Mach number.Result shows that if the total pressure and total temperature of incoming flow remain unchanged,isolator with equal section can’t resist the influence of back pressure when the Mach number increasing.When the Mach number is diminutive,isolator with both expanded is better than isolator with equal section;When the Mach number is diminutive,the conclusion was revered.更多还原