航天器在轨气体泄漏流场及声场特性仿真研究

航天器在轨运行安全受到空间碎片威胁，一旦发生泄漏必须及时发现与修补。泄漏流场及声场特性是声学泄漏检测的重要基础。为探究航天器在轨气体泄漏流场及声场特性，文章通过LES模型及Lighthill理论建立泄漏的流体动力学及声场模型，并进行仿真研究。针对不同孔径的漏孔，明确了泄漏模型的速度分布及声场特征，结论可为航天器在轨声学泄漏检测提供理论依据。

Simulation of characteristics of gas leakage flow field and sound field of space station in orbit

The operation safety of spacecraft in the space environment is threatened by the space debris. Any leakage thus caused must be detected and repaired in time. The acoustic leakage detection is based on the characteristics of the flow field and the sound field. In order to study the characteristics of the flow field and the sound field of spacecraft when the gas leakage occurs in orbit, fluid dynamics and sound field models of leakage are established through the LES model and the Lighthill theory. For leak holes of different apertures, the characteristics, the velocity distributions and the Mach number distributions are obtained. The results can provide some guidance for the early warning and the detection of the location of the spacecraft on-orbit leak.