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Radome-enclosed antenna's temperature and velocity fields

Authors
Journal
Applied Thermal Engineering
1359-4311
Publisher
Elsevier
Publication Date
Volume
50
Issue
1
Identifiers
DOI: 10.1016/j.applthermaleng.2012.07.036
Keywords
  • Radome
  • Antenna
  • Diurnal
Disciplines
  • Computer Science
  • Design
  • Mathematics
  • Physics

Abstract

Abstract Thermal distortion is a critical design consideration for the Haystack Ultrawide-band Satellite Imaging Radar (HUSIR) with respect to its performance at W-band. This design consideration is needed due to the thermal distortion effects on the surface accuracy of a parabolic reflector. For example, a tight surface tolerance of ∼100 microns root-mean-squared is required to obtain 85 percent antenna performance efficiency for the 37 m (120 foot) diameter reflector. An understanding of the temperature and velocity fields aids compensation of these losses. Computational fluid dynamics models (CFD) are too computationally expensive to implement in a control algorithm. This work develops a simplified analytical model to predict the surface temperature of a metal antenna based on external diurnal temperature variations. This work also applies proper orthogonal decomposition (POD) to simulated CFD data and creates a reduced order model of the fluid system that characterizes the dominant features of both the temperature and velocity fields.

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