Computing Thermal Protection of the Soil-Sampling Mechanism Drive of the Venera-D Automatic Interplanetary Station Exposed to Extreme Operation Conditions

Abstract

The paper proposes a method for ensuring thermal protection of the soil-sampling mechanism drive installed on the Venera-D mission descent module. Thermal protection design and development for the missions to Venus requires taking into account the systems harsh operation conditions on the planet surface, where atmospheric temperature is ~ 500 °C and pressure is ~ 100 atm. As the descent module sealed compartment is possibly lacking space, the drive should be installed outside the sealed compartment, which requires design and development of the drive thermal protection. The method for providing thermal protection lies in introducing a phase-change heat accumulator in the mechanism as a key element that counteracts the external heat flows. Computational experiment was conducted using a mathematical model, which resulted in selecting the most suitable of two materials for the heat accumulator and finding optimal parameters of the thermal protection geometry making it possible to ensure the system lowest mass. Design solution for the thermal protection was developed. It included electric motor witha gearbox surrounded by the heat accumulator internal layer and by external layer of the heat-protective material, and with an output shaft fixed by the radial thrust bearings installed in a cup. Two technical solutions in selecting material for the heat accumulator obtained as a result of a computation experiment were compared

Please cite this article in English as:

Koveshnikov A.A., Paleshkin A.V. Computing thermal protection of the soil-sampling mechanism drive of the Venera-D automatic interplanetary station exposed to extreme operation conditions. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2024, no. 3 (150), pp. 4--18 (in Russ.). EDN: WGLVOV

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