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首页> 外文期刊>Journal of Spacecraft and Rockets >Thermal Vacuum Evaluation of Simulated Spacecraft Radiators with Discretized Emissivity Surface Properties
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Thermal Vacuum Evaluation of Simulated Spacecraft Radiators with Discretized Emissivity Surface Properties

机译：具有离散发射率表面特性的模拟航天器散热器的热真空评估

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摘要

Incorporating variable emissivity electrochromic devices onto spacecraft radiators offers a unique potential for modulating passive heat rejection, but implementation challenges exist. Although high-/low-end states of these devices are readily achievable, uncertainties remain with reproducibility at intermediate states and also with stability in a thermal vacuum environment. An average intermediate heat rejection rate can be obtained by discretizing the radiator surface into mixed high- and low-emissivity values. We emulated this capability by constructing test articles with two fixed-emissivity states divided into four sections. Coupons were constructed from aluminum 6061 and stainless steel 304 to characterize performance variations resulting from differences in thermal conductivity. Tests were devised to maintain either a constant surface temperature or constant heat flux. The results showed that this approach provided a predictable area-averaged intermediate emissivity regardless of the material's thermal conductivity or the heat rejection scheme used. When operating in a constant flux mode, however, the stainless steel coupon experienced larger lateral temperature gradients across the surface due to its lower thermal conductivity. Performance of a variable emissivity radiator must, therefore, take into account not only surface properties, but also consider the desired system heat rejection control scheme and localized thermal gradient tolerance.
机译：将可变发射率电致变色设备集成到航天器散热器中，为调制无源散热提供了独特的潜力，但存在实施挑战。尽管这些设备的高端/低端状态是很容易实现的，但是不确定性仍然存在于中间状态的可重复性以及在热真空环境下的稳定性。通过将散热器表面离散为混合的高发射率和低发射率值，可以获得平均中间散热率。我们通过构建具有两个固定发射率状态（分为四个部分）的测试文章来模拟此功能。优惠券由铝制6061和不锈钢304制成，以表征由于导热系数不同而导致的性能差异。设计测试以保持恒定的表面温度或恒定的热通量。结果表明，该方法可提供可预测的平均面积中间发射率，而与材料的热导率或所使用的散热方案无关。但是，当以恒定磁通量模式运行时，由于其较低的导热性，不锈钢试样在整个表面上会经历较大的横向温度梯度。因此，可变辐射率散热器的性能不仅必须考虑表面特性，还必须考虑所需的系统散热控制方案和局部热梯度公差。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2017年第2期|368-375|共8页
  • 作者

    Massina Christopher J.; Nabity James A.; Klaus David M.;

  • 作者单位

    Univ Colorado, Aerosp Engn Sci, 429 UCB, Boulder, CO 80309 USA;

    Univ Colorado, Aerosp Engn Sci, 429 UCB, Boulder, CO 80309 USA;

    Univ Colorado, Aerosp Engn Sci, 429 UCB, Boulder, CO 80309 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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