Wind Tunnel Equipment for Inspection of Conductor Radiation in Breeze

Abstract

This paper describes a wind tunnel facility specially designed for a test regarding heat conduction from an overhead transmission line to ambient air under very low speed wind condition, which ranges under 0.1 to 1m/s. To establish a uniform velocity distribution at such low speed, this wind tunnel is equipped with moving sidewalls, which considerably reduces the wall boundary layer thickness.
A screen was installed at the entrance of test section to improve the uniformity of the velocity. The results of the performance tests of this wind tunnel showed that the nonuniformity of the velocity profile at the test section is less than 0.01m/s. Also long-time unstability of air speed was proved to be sufficiently minimal.