"Struts" in propeller airflow
"Struts" in propeller airflow
(OP)
I am designing a propeller support system (think wind tunnel) where the propeller shaft is supported by multiple radial struts that are very close(upstream and downstream)to the propeller. Propeller diameter 8.5 ft(2.6m), struts are 1.5 ft(0.5 m) upstream and 3 inches (0.1m ) downstream.
Propeller power will be 50 hp max. (37kW).
If there is equal angle strut displacement - resonance may be a problem. Maybe the strut regular displacement should be staggered to decrease the probability of resonance?
Any thoughts on the axial and tangential pulse forces on the propeller.
Propeller power will be 50 hp max. (37kW).
If there is equal angle strut displacement - resonance may be a problem. Maybe the strut regular displacement should be staggered to decrease the probability of resonance?
Any thoughts on the axial and tangential pulse forces on the propeller.





RE: "Struts" in propeller airflow
Mike Halloran
Pembroke Pines, FL, USA
RE: "Struts" in propeller airflow
There's obviously 1 less stator blade than propeller blades.
Steven Fahey, CET
RE: "Struts" in propeller airflow
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: "Struts" in propeller airflow
RE: "Struts" in propeller airflow
Not only are the #of blades and struts unequal [odd-VS-even]... but the struts are canted "off the center axis" of the fan... while the fan-blades are roughly "on-axis". This is useful for improved torque stiffness... and misaligns the strut and blade axis(s)... for improved vibration resistance.
Regards, Wil Taylor