Spinning mode duct test rig
A duct mode detection facility is developed in AANTC to evaluate the noise reduction in engine ducts. It is also used for duct mode detection method. The rig has a diameter of 200 mm, the flow speed is 10-60m/s, and the maximum working frequency is 8000 Hz. More details: H. Bu, X. Huang, X. Zhang, An overview of testing methods for aeroengine fan noise, Progress in Aerospace Sciences, vol. 124, 100722, 2021.