Abstract: In order to improve the maximum back pressure of low-cowl drag two-dimensional high Mach number inlets，the impact of a splitter located in the internal contraction portion on the maximum back pressure of low-cowl drag two-dimensional high Mach number inlets was studied. Numerical simulations were conducted to study the back pressure characteristics of two groups of low cowl-drag two-dimensional high Mach number inlets with and without splitter. The corresponding flowfield structures were analyzed. Results show that，inserting a splitter in the internal contraction section can significantly suppress the severe shock wave/boundary layer interaction and improve the uniformity of airflow parameters distribution，so as to make the shock train propagate upstream sysmetrically. The maximum back pressure of ICR1.566 inlets can be increased by 4.2% by splitter. The splitter not only increases the compression efficiency，but also improves the maximum back pressure of low cowl-drag high Mach number inlets，which can widen the stable operation range of high Mach number inlets.

Key words: High Mach number inlet；Splitter；Low cowl-drag；Back pressure characteristics

摘要： 为了提高低外阻二元高马赫数进气道的抗反压性能，研究了在内收缩段设置隔板对低外阻二元高马赫数进气道抗反压能力的影响，通过数值仿真计算了两组不同内收缩比的低外阻二元高马赫数进气道内收缩段有/无隔板下的反压特性，并对比分析了相应的流场结构。结果表明，隔板能够显著抑制低外阻二元高马赫数进气道内强激波/边界层干扰现象，改善隔离段入口截面气流参数分布的均匀性，使隔离段内激波串结构上下较为对称地推进。内收缩比1.566进气道引入隔板能够将极限反压提高4.2%。引入隔板能够在增加进气道压缩效率的前提下，提高进气道的最大抗反压能力，拓宽进气道的稳定工作范围。

关键词: 高马赫数进气道；隔板；低外阻；反压特性