The mutual interactions between the two propellers result in unsteady periodic blade loading
oscillations during one full rotation.
In addition, the blade loading
and power distributions related to the cavitation at design flow rate were analyzed systematically.
The comparison of the wall skin friction, blade loading
, and hub-to-shroud loading losses should be done for different operating scenarios such as design (rated) mass flow-rate, reduced (part-load) flow-rates, etc.
as a percentage of blade span or chord) and the blade loading
(local pressure difference between blade pressure and suction surfaces).
As the axial compressor moves from the rated operating point to a near-stall operating point, the blade loading
increases and the flow structures become stronger and unsteady.
(10.) Alheid, RJ, "Flexible Blade Coating Arrangement and Method with Compound Blade Loading
Even though the fans are typically not operating during the period of normal train operation it is critical to give consideration to the blade loading
cycles that results from the pressure pulses.
Since >75% of the power is developed at radii more than halfway to the tip, the useful blade loading
can be approximated to a total circumferential force of 180kN distributed between the blades and acting at a radius of around 80m.
Examination of a few worn blades can identify the following items: uneven blade wear, holder or chamber alignment, blade contact angle, relative amount of blade loading
pressure and presence of ink contamination.