低空環(huán)境中多層隔熱組件的破壞機理研究及防護

The failure mechanism of multilayer insulation (MLI) in low-altitude environment and its protection

摘要: 不同于國內(nèi)外航天器110 km以上高度的常規(guī)拋罩，設(shè)定衛(wèi)星在67 km低空環(huán)境下拋罩，針對此情況下主動段氣流對星外多層隔熱組件的破壞機理進行研究。多層隔熱組件的破壞是剪切力和材料鼓脹力的綜合作用。通過理論分析和風(fēng)洞沖刷試驗，確定了星外多層隔熱組件的防護方案，并且已經(jīng)經(jīng)過在軌飛行試驗的驗證。

Abstract: The protective fairings designed to bear the brunt of heating are generally jettisoned at an altitude of above 110 km. However, a satellite may work at an altitude of below 67 km. This paper studies the specific conditions in the low-altitude environment, focusing on the failure mechanism of multilayer insulation (MLI) affected by ascent airflow. The results show that the failure of MLI is due to the combined action of shearing force and material’s expansive force. A shielding scheme for MLI is put forward based on the analysis and is validated by the experiment in wind tunnel. The shielding measurement for MLI is confirmed by the real flights.

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