This study numerically investigates fluid dynamics of a jet flow at supersonic speed. The meshless method and the overlapping point cloud method are used to handle the moving boundary problems. The interaction between the jet flow and a moving ball-shaped plug is numerically solved, which has been rarely done in the published literature. The switching mechanism of a novel designed jet valve in an attitude and orbit control system (AOCS) is analyzed. It is found out that applied pressure to the control inlets of the jet valve must be high enough in order to successfully drive the plug to move and subsequently change the force direction acting on the jet valve. Then the switching mechanism of AOCS can be triggered. The initial fluid condition also plays a vital role and it significantly influences the response time of the switch. This study explores the underlying physics of the jet flow on its deflection, wall attachment, and interaction with the ball-shaped plug. It contributes to the optimization design of the jet valve in the AOCS with a fast and efficient response.

本研究对超音速射流的流体动力学进行了数值研究。无网格方法和重叠点云方法用于处理移动边界问题。射流和移动的球形塞之间的相互作用是通过数值求解的，这在已发表的文献中很少进行。分析了一种新设计的射流阀在姿态轨道控制系统（AOCS）中的切换机制。发现施加到喷射阀的控制入口的压力必须足够高，以便成功地驱动塞子移动并随后改变作用在喷射阀上的力的方向。然后可以触发AOCS的切换机制。初始流体条件也起着至关重要的作用，它会显着影响开关的响应时间。本研究探讨了射流在其偏转、壁附着和与球形塞的相互作用方面的潜在物理学。它有助于 AOCS 中喷射阀的优化设计，具有快速高效的响应。