The basic principles which are currently applied to BE-M theory for rotor performance prediction are transferred to the CFD code, allowing the correlation between flow geometric characteristics (such as blade angles of attack) and dynamic quantities (such as rotor torque and blade tangential and normal forces).
Sample results are presented to demonstrate the effects of blade angle of attack, camber, thickness, Mach number and pitch-chord ratio on the unsteady aerodynamic response.
The performance parameters considered are power coefficient, axial and angular induction factors, lift and drag coefficients on the blade, angle of attack and angle of relative wind.
Thus, the purpose of this study is to examine the effect of geometrical design of a floor swirl diffuser on the aspects of airflow rate, number of diffuser blades, angle of attack of diffuser blades, and the grille thickness.
The disks are surrounded by blades whose angle of attack can be altered by off-setting the axis of the rotating disks.
Varying the pitch angle of a rotor blade changes its angle of attack and hence its lift.
Calculations showing the effect of blade thickness and angle of attack on the unsteady loading spectra are given.
It was also noticed that for some velocities, the maple blade with an angle of attack of zero and a pitch of 23, the reduction in displacement was the lowest and the increase in stress increased more than any of the other blades.
Starting is important for small turbine blades which have no pitch adjustment as the stationary or slowly rotating blades experience high angles of attack, α, which generate low aerodynamic torque and lead to long starting times in which no power is extracted.
Because the blades are attached to a rotor hub by horizontal flapping hinges, which permit their movement in a vertical plane, the advancing blade flaps up, decreasing its angle of attack, while the retreating blade flaps down, increasing its angle of attack.
