PURPOSE: To make improvements in aerodynamical efficiency by controlling a momentary geometrical angle of respective profiled blades into its angular azimuth secured to the blade. CONSTITUTION: This is such a type as rotating a rotor at rotation speed ωaround a rotation axis O in a fluid, and...
Azimuth angle of rotor blade (°) DSV: Dynamic stall vortex LEV: Leading edge vortex SLEV: Secondary leading edge vortex TEV: Trailing edge vortex TSV: Turbulent separation vortex AR: Aspect ratio MS: Moderate speed HS: High speed i, j, k: In the three-dimensional flow, 1...
The positions of the Lagrangian markers are defined as a function of the blade azimuth angle (ψ) and wake age (ζ). Thus, the initial helical wake structure will change as the markers convect downstream. The rate of change of the Lagrangian markers’ position can be expressed in the partia...
In particular they noted that, compared with flight test data, there was a reduced rate of change of normal force between 120 and 240 deg azimuth at the outboard stations and an increased rate of change of pitching moment in the same azimuth interval. The cause of these differences was ...
The speed regulation wind turbine realizes the flexible connection of the drive chain and alleviates the impact load to a certain extent. However, there are still some disadvantages, such as large volume, high cost, large converter capacity and narrow operation range of variable speed constant frequ...
Several porosity values ranging from 0.0 to 0.9 with variations in the angular positions from 60° to 120° were evaluated in their study, conducted on a two-dimensional domain using the SSTk-ω model. They observed that the porous deflector outperformed the flat plate solid deflector. They ...
The positions of the Lagrangian markers are defined as a function of the blade azimuth angle (ψ) and wake age (ζ). Thus, the initial helical wake structure will change as the markers convect downstream. The rate of change of the Lagrangian markers' position can be expressed in the ...
feathering coefficient, ρ is azimuth angle, A2 is the two/rev. feathering coefficient, λ is the inflow ratio, X is the blade span ratio (r/R) and μ is the tip speed ratio. It should be understood that the graph of FIG. 5 is schematic and is not intended to present a true ...
(VTOL) propulsion concept that includes several blades12configured for rotation about a horizontal axis15with the blade span of each blade12oriented parallel to the axis of rotation15. The pitch angle of each of the blades12is varied periodically as the blade12moves around the azimuth of a ...
It will be appreciated that FM for a particular rotor is an indication of the ratio of the induced power required to produce a given amount of thrust if the air were uniformly accelerated through the rotor disc around the azimuth, to the actual total power (induced plus profile) required to...