Israel J Wygnanski

20110236181, Sep 29, 2011

Dec 7, 2009

13/132863

Israel J. Wygnanski - Tucson AZ, US

THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA - Tucson AZ

F04D 27/00
F01D 25/16

415 1, 4151701

A vertical axis wind turbine comprises upper and lower rotor blades and upper and lower bearing assemblies. Horizontal members connect the upper rotor blades to the upper bearing assembly and the lower blades connect the upper rotor blades to the lower bearing assembly. The upper rotor blades can be arranged vertically or non-vertically. In non-vertical arrangements, the upper rotor blades can be twisted or swept back in a straight manner. The turbine can be self-supporting with a need for a continuous vertical axis connecting the bearing assemblies. Sweeping jet actuators are incorporated into the rotor blades to deliver oscillating air jets to surfaces of the rotor blades to delay occurrence of dynamic stall. Conduits in the blades can deliver pressurized flow of air to the actuators. The turbine can be supported by a structure that can exerts only horizontal and/or lifting forces on the rotor blade assembly to reduce the load on the lower bearing.

52094383, May 11, 1993

Jun 20, 1988

7/208529

Israel Wygnanski - Tucson AZ

B64C 2100
B64C 2300

244203

An active perturbation-producing element on the solid surface is driven to induce oscillations in the boundary layer of the fluid stream about an axis substantially perpendicular to the solid surface, to enhance the mixing of the boundary layer in the fluid stream. The method is particularly applicable for increasing the lift of a wing, but may also be used for increasing the divergence angle of a diffuser.

54029643, Apr 4, 1995

Oct 25, 1993

8/142730

Israel J. Wygnanski - Tucson AZ

B63H 1110
F02K 100

244 1N

Apparatus for the interference and manipulation of vortex formation and control of fluid flow to reduce noise and increase flow stability is provided. A specific embodiment is directed to a flexible jet noise suppressor for aircraft, particularly supersonic transport. The jet noise suppressor comprises at least one flexible filament having a length that is about 3 to 10 nozzle diameters. The filament(s) trail behind the nozzle and may be let out for take-off and climb and reeled in while the aircraft is in flight or on the ground. Surprisingly, the use of a single flexible filament eliminates the well-known "screech noise" at about 3,000 Hz and reduces the screech noise by about 50 dB while further reducing the broad band noise up to 15 dB over the entire sound spectrum.

20160152324, Jun 2, 2016

Apr 1, 2014

14/242809

- Pasadena CA, US
Israel Wygnanski - Tucson AZ, US

B64C 21/10

A system, apparatus, device, and method for controlling fluid flow, including one or more devices generating one or more secondary fluid flow structures, wherein the fluid flow structures emanate from the aerodynamic or hydrodynamic surface, have a strength that is controlled independently of the primary flow, and enhance the aerodynamic or hydrodynamic force generated by primary flow predominantly by changing direction of said primary flow whether the flow is attached or separated from the surface, and/or interrupting and re-starting said primary flow forming regions that are not directly affected by the fluid flow structure regardless of whether said primary flow is attached or separated.