1
Richard A Oman, Kenneth M Foreman: Variable stator, diffuser augmented wind turbine electrical generation system. Grumman Aerospace Corporation, Richard G Geib, Mellor A Gill, February 21, 1978: US04075500 (102 worldwide citation)

A wind powered electrical generating system having a suitable shaped aerodynamic duct or shroud within which a wind turbine having a fixed pitch blade is mounted, as by means of a stator means at the inlet of the duct or shroud with the stator means including mechanism for varying their effective an ...


2
Richard A Oman: Portable wind turbine for charging batteries. Grumman Aerospace, Morgan Finnegan Pine Foley and Lee, April 13, 1982: US04324985 (67 worldwide citation)

In a wind turbine assembly incorporating a diffuser, the diffuser includes an articulated duct formed of a set of members, such as the sectors of a conic section, which are pivotable about axes in a plane normal to the turbine axis. To permit an enlargement or contraction of the articulated duct, th ...


3
Kenneth M Foreman, Richard A Oman: Acoustic emission flow measurement system. Grumman Aerospace Corporation, Morgan Finnegan Pine Foley & Lee, May 25, 1976: US03958458 (12 worldwide citation)

Pseudo sound created by the interaction of fluid flowing over a discontinuity in a conduit is sensed by a transducer. The transducer signal is reduced to a frequency-amplitude distribution and the amplitude at the characteristic frequency is used to calculate fluid flow rate using a dipole model. Th ...