Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Responsive to relative working fluid velocity
Patent
1978-01-17
1980-07-22
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Responsive to relative working fluid velocity
416193R, 416237, F03D 704
Patent
active
042137373
ABSTRACT:
Windmill apparatus comprises an open framework defining a wheel having means defining a pivot axis and embodying a plurality of radially and closely spaced concentric rows of air foils. The foils in each row are connected for their conjoint movement to and from a pre-set operating position, within defined limits. The movement of each foil is about an axis which is substantially radial to the wheel and it is arranged to automatically feather when subject to impact of winds the speed of which is at a dangerous level. As oriented in the wheel the radial extremities of each foil are substantially flat and bridged by a continuous peripheral surface portion. One portion of said peripheral surface portion is flatted to define the operating face of the foil. The flatted portion is preferably comprised of two planar surface portions one of which leads the other, having regard for the facing of the foil operating surface into the prevailing wind. The trailing planar surface portion of each foil is angled obliquely and outwardly from its leading planar surface portion. The balance of the peripheral surface of each foil is generally arcuate in profile in a sense transverse to its pivot axis and is so curved as to depart sharply from said flatted portion to give the foil a bulbous configuration to one side. The peak of the curved portion of the peripheral surface of the foil gives a depth to the foil at its location the dimension of which is approximately half that of said flatted portion. This gives each foil a short, stubby appearance.
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Bloom Jerome P.
Powell Jr. Everette A.
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