In order to investigate the pressure and flow characteristics of the rotating channels

a new measurement system was invested and implemented in National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics of Beijing University of Aeronautics and Astronautics. The new measurement system with high measurement accuracy and plural air channels could reach high Rotation numbers by increasing the back pressure of test section. The Reynolds and Rotation numbers ranged from 20000 to 70000 and 0 to 1.025 respectively. The investigation used different temperature ratio conditions to investigate the pressure and flow characteristics of the rotating two-pass square duct with smooth walls. The results proved the reliability and superiority of the measurement system by comparing with similar experiments in foreign countries. The result showed that the static flow resistance increased with the increasing Reynold number

and decreased when the Reynold number was high enough. In cold conditions

the flow resistance increased with the increasing Rotation number. In thermal state

the flow resistance showed no obvious change in low Rotation number

and increased significantly with the increasing Rotation number in high Rotation number.