Effect of blade stagger angle on the vibration characteristics of axial fan in turbomachinary system by finite element method using ansys

الملخص EN

This paper discusses the dynamic behavior (natural frequencies, modes shapes) of the axial fan.

The fan blade stagger angle are adjustable.

Three angles 20o, 35o and 60o are studied.

Three dimensional finite elements with six degrees of freedom per node are employed to idealize the axial fan.

ANSYS12 program is performed that takes the variables of the fan blade system.

The obtained results reported the tenth structural natural frequencies and mode shapes which are based upon the behavior of fan, it can be shown that the natural frequency of the fan increased with increasing mode number and the amplitude decreases as the stagger angle increases.

The results shows that the maximum amplitude occurred at stagger angle of 20° and have less error ratio.