Clear Aperture Anti-Frost Technology.

摘要

A theoretical and experimental study of a class of clear aperture anti-frost (CAAF) devices is described. Generalized scaling laws for CAAF operation are derived and verified in laboratory experiments. The design,instrumentation and testing of a 10-inch aperture axial flow CAAF is described,and laboratory operation is demonstrated. It is shown that injection of a warm gas primary flow is permissible,and that a secondary,swirling flow is required for internal flow stabilization. Wind tunnel simulation experiments are summarized and transmission data is presented for simulated open canopy operation. Successful CAAF operation for more than four hours is demonstrated for a 500pound/hour flowrate.