Experimental Study of a Ducted Contra-rotating Lift Fan for V/STOL UAV Application

摘要

This study explores the aerodynamic characteristics of a ducted contra-rotating lift fan for V/STOL application by means of force and pressure measurements. The effect of rotating frequency on the force generation were examined using a six-component force sensor. Additionally, for the sake of considering the ground effect, the flow field at the exist were investigated using pressure measurement. Results revealed that the lift shows a quadratic generation trend with increasing the RPM. The contra-rotating mechanism can significantly augment the lift while still lower than double single rotors. When the UAV approaches the ground, the lift will be augmented due to the surplus of the wake jet.