Results of experimental and numerical modeling of supersonic underexpanded jets exhausting into a slotted submerged space formed by two parallel disks are presented. It is demonstrated that the structure of the exhausting off-design jet depends on the distance between the disks. The friction force acting from the disks on the gas is responsible for significant changes in the supersonic jet structure At a certain distance between the disks, there arises a curvilinear shock wave, followed by a subsonic flow region. In this case, the jet boundary acquires a fan-shaped structure rather than a typical barrel-shaped structure.

中文翻译：

---

超音速欠膨胀射流排入狭缝淹没空间的研究

介绍了排入由两个平行圆盘形成的狭缝淹没空间的超音速欠膨胀射流的实验和数值模拟结果。结果表明，排气非设计射流的结构取决于圆盘之间的距离。圆盘作用在气体上的摩擦力是造成超音速射流结构发生显着变化的原因。在圆盘之间的一定距离处，会出现曲线激波，然后是亚音速流动区域。在这种情况下，射流边界获得扇形结构而不是典型的桶形结构。