| 摘要 |
An insulated duct. The duct includes a concentric arrangement of a flowpath-defining inner wall and an outer wall, with insulation disposed in the annular region between the walls. A portion of the axial length of the annular region away from the end of the duct is filled with lower-density insulation, while another portion adjacent the duct end is filled with higher-density insulation than that of the portion away from the duct end. The higher-density insulation helps keep the concentric walls in their as-manufactured relative spacing and shape. Flanges may be attached to one or both of the walls at the ends of the duct to facilitate joining of adjacent duct segments.
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