长高比对隔离段激波串特性的影响研究  

Study on the Influence of Aspect Ratio on the Characteristics of Shock Train in the Isolator

作　　者：浮强 冯泽溪 李昊轩 FU Qiang;FENG Zexi;LI Haoxuan(Xi’an Aeronautical Institute,Xi’an 710077,China)

机构地区：[1]西安航空学院,陕西西安710077

出　　处：《郑州航空工业管理学院学报》2025年第1期10-17,共8页Journal of Zhengzhou University of Aeronautics

基　　金：陕西省自然科学基础研究计划项目(2023-JC-QN-0558)。

摘　　要：隔离段是双模态超燃冲压发动机能够在不同飞行马赫数下以超燃和亚燃模态工作的核心部件。为了研究双模态超燃冲压发动机隔离段设计中长高比对隔离段激波串特性和超音速流动的影响,对以长280 mm、高30 mm的矩形隔离段为基准的一系列隔离段进行数值模拟研究。首先将计算得到的基准隔离段中心壁面压力和第一道激波位置与实验数据进行比较,验证数值模拟的准确性与合理性;进而分析在相同来流条件下,不同长高比对隔离段内激波串的形成位置、压力分布、速度分布等流动特性的影响。研究发现:随着隔离段长高比的增大,隔离段抗反压能力相应增强,激波串位置随之后移,激波强度减弱,激波串结构更加紧密,发生附面层分离及转捩的位置更靠近隔离段的出口位置,隔离段内的空气堵塞程度减小。The isolator is the core component of a dual-mode scramjet engine that can operate in both supersonic and subsonic modes at different flight Mach numbers.To investigate the influence of aspect ratio on the shock train characteristics and supersonic flow within the isolator,a numerical simulation study was conducted on a series of isolator configurations based on a reference rectangular isolator with a length of 280 mm and a height of 30 mm.First,the center wall pressure and the position of the first shock wave of the reference isolator were calculated and compared with experimental data to verify the accuracy and rationality of the numerical simulation.Then,the influence of different aspect ratios on the shock wave train was analyzed under the same inflow conditions,focusing on its formation position,pressure distribution,velocity distribution,and other flow characteristics.The results show that,as the length-to-height ratio of the isolator increases,the isolator’s resistance to back pressure improves,the position of the shock wave string moves backward,the shock wave intensity weakens,the shock wave string structure becomes more compact,the position where boundary layer separation and transition occur is closer to the outlet position of the isolator,and the degree of air blockage in the isolator decreases.

关 键 词：双模态超燃冲压发动机 隔离段 激波串 长高比 

分 类 号：V19[航空宇航科学与技术—人机与环境工程]