超低轨环境实验系统设计与研究OA

This study addresses the requirements for ground-based simulation of the very low Earth orbit atmospheric environment and completes the overall design of the experimental system,the development of a high-speed atomic oxygen generation device,and the performance validation of key modules.By analyzing the typical flow characteristics of the very low earth orbit(VLEO)environment,the essential conditions for ground simulation are identified,including a high-speed atomic oxygen beam,a rarefied free-molecular flow regime,and controllable particle velocity and composition.Based on these requirements,an integrated experimental platform is established,consisting of a helicon plasma source,a velocity control unit,a particle separation module,and a neutralization system.Experimental results demonstrate that the electro-magnetic coupled velocity control enables stable selection and output of target velocity ranges;target current measurements reveal a bimodal velocity structure of the helicon plasma plume;and neutralization experiments confirm that a high-purity,high-speed atomic oxygen flow can be obtained with a tungsten filament current of approximately 3 A.Overall,this work establishes a ground-based VLEO environment simulation platform with high stability and controllability and verifies the feasibility of high-speed atomic oxygen generation.The platform can support capture performance tests of air-breathing electric propulsion intakes,thruster-intake matching experiments,and atomic oxygen erosion studies of materials,providing important support for the development of key technologies for VLEO spacecraft.