Axial Fan Blade Failure

An axial fan blade can be considered as cantilever beam on which air pressure and centrifugal force are applied blade failure due to different forces during its operation is analysed by fixing its one end at hub by v block as shown in fig.

Axial fan blade failure.

7 8 stressing of axial impellers 7 8 1 introduction. The fan is designed to produce a pressure difference and hence force to cause a flow through the fan factors which determine the performance of the fan include the number and shape of the blades. Both blades were replaced with care to maintain the balance of the entire assembly and then. Fan performance is wrong.

Wtw bill cory in fans and ventilation 2005. The fdf blade has been run for 5 years and before its failure the fdf experienced high vibration 14 mm s. Visual inspection metallographic analysis chemical composition and hardness test were carried out to find the cause of the failure. Axial fans are divided into three groups propeller tube axial and vane axial whereas centrifugal fan are classified as airfoil blade radial fans forward curved fans and backward inclined curved fan.

This paper includes the affects on the performance of axial fan due to the failure of different parts. The forced draft fan fdf blade in a 300 mw coal fired power plant that experienced catastrophic failure has been investigated. There were two main locations of the blade damage namely damage at. The flow is axial at entry and exit.

As in most cases the blades are cantilevered and only supported at the end adjacent to the hub fluctuating stresses are more important. E authors concluded that the blade crack was due to fatigue situations in resonance state and the. The forced draft fan is an axial flow fan horizontally in front of the boiler and the fan is single stage. Axial flow fan impellers will also be subject to centrifugal forces and thus the various elements will be stressed.

An axial fan is a type of fan that causes gas to flow through it in an axial direction parallel to the shaft about which the blades rotate. Kushwaha studied failure analysis and technique of averting fracture in the generator s fan blade.