Experimental Investigation on Flow Field between Two Fans of Contra-Rotating Fan Unit

An experimental investigation was completed for studying the flow field between two contra rotating fans.A five hole probe was employed to measure the velocity field and pressure field between the two fans in case of varying their rotating speeds and the axial gap between them.The results of this study show: the work distribution between their rotor blades plays an important role in aerodynamic design of contra rotating fan and can be achieved through matching of their rotating speeds.Control design of the axial gap is also important for aerodynamic design of contra rotating fans.