scholarly journals Lifting-Surface Theory for Multi-Wing Configurations of Elastically Supported Flapping Wing Power Generator

2012 ◽  
Vol 55 (3) ◽  
pp. 157-165 ◽  
Author(s):  
Koji ISOGAI ◽  
Hisanori ABIRU
Keyword(s):  
Flapping Wing ◽  
Power Generator ◽  
Surface Theory ◽  
Lifting Surface ◽  
Elastically Supported

Experimental Study on a Cascade Flapping Wing Hydroelectric Power Generator

2011 ◽  
Author(s):  
Hisanori Abiru ◽  
Akira Yoshitake
Keyword(s):  
Power Generation ◽  
Electric Motor ◽  
Flapping Wing ◽  
Hydroelectric Power ◽  
Power Generator ◽  
Flow Energy ◽  
Wing Model ◽  
Leaf Springs ◽  
Hydroelastic Response ◽  
Elastically Supported

In this paper, a hydroelectric power generator that can extract the water flow energy from the hydroelastic response of an elastically supported rectangular wing is experimentally investigated. An electric motor is used to excite pitching oscillations of the wing. The wing and the electric motor are supported by leaf springs that are designed to function both as a linear guide for the sway oscillations and as elastic elements. The wing mass in the sway direction necessary to achieve a hydroelastic response is obtained by utilizing a mechanical snubber mechanism. The load to generate electricity is provided equivalently by magnetic dampers. In a previous paper, the power generation rate and the efficiency of a single-wing model were examined through experiments, and the feasibility of a flapping wing hydroelectric power generator was verified. In this paper, the influence of neighboring wings is examined by using two experimental apparatuses with the intention of achieving a practical cascade-wing generator. Tests showed that a cascade moving in-phase with neighboring wings with smaller gaps between the wings has a higher rate of electric power generation.

Continuity of lifting surface theory in subsonic and supersonic flow

AIAA Journal ◽  
1998 ◽  
Vol 36 ◽  
pp. 1788-1791
Author(s):  
Tetsuhiko Ueda
Keyword(s):  
Supersonic Flow ◽  
Surface Theory ◽  
Lifting Surface

Unsteady Lifting Surface Theory for a Rotating Cascade of Swept Blades

1989 ◽  
Author(s):  
Hidekazu Kodama ◽  
Masanobu Namba
Keyword(s):  
Three Dimensional ◽  
Acoustic Power ◽  
Aerodynamic Characteristics ◽  
Blade Loading ◽  
Surface Theory ◽  
Numerical Examples ◽  
Lifting Surface ◽  
Blade Flutter ◽  
Annular Cascade ◽  
Remarkable Reduction

A lifting surface theory is developed to predict the unsteady three-dimensional aerodynamic characteristics for a rotating subsonic annular cascade of swept blades. A discrete element method is used to solve the integral equation for the unsteady blade loading. Numerical examples are presented to demonstrate effects of the sweep on the blade flutter and on the acoustic field generated by interaction of rotating blades with a convected sinusoidal gust. It is found that increasing the sweep results in decrease of the aerodynamic work on vibrating blades and also remarkable reduction of the modal acoustic power of lower radial orders for both forward and backward sweeps.

Lifting-Surface Theory for an Oscillating T-Tail

AIAA Journal ◽  
1974 ◽  
Vol 12 (1) ◽  
pp. 28-37 ◽  
Author(s):  
KOJI ISOGAI
Keyword(s):  
Surface Theory ◽  
Lifting Surface

New directions in lifting surface theory

1964 ◽  
Author(s):  
H. ASHLEY ◽  
M. LANDAHL
Keyword(s):  
Surface Theory ◽  
Lifting Surface ◽  
New Directions

Derivation by a Transform Method of Integral Equations of Unsteady Lifting Surface Theory in Subsonic and Supersonic Flow

1979 ◽  
Vol 30 (4) ◽  
pp. 529-543
Author(s):  
Shigenori Ando ◽  
Akio Ichikawa
Keyword(s):  
Fourier Transforms ◽  
Integral Transforms ◽  
Physical Models ◽  
Streamwise Direction ◽  
Fourier Inversion ◽  
Transform Method ◽  
Inviscid Flows ◽  
Surface Theory ◽  
Method Of Integral Equations ◽  
Lifting Surface

SummaryApplications of “integral transforms of in-plane coordinate variables” in order to formulate unsteady planar lifting surface theories are demonstrated for both sub- and supersonic inviscid flows. It is concise and pithy. Fourier transforms are exclusively used, except for only Laplace transform in the supersonic streamwise direction. It is found that the streamwise Fourier inversion in the subsonic case requires some caution. Concepts based on the theory of distributions seem to be essential, in order to solve the convergence difficulties of integrals. Apart from this caution, the method of integral transforms of in-plane coordinate variables makes it be pure-mathematical to formulate the lifting surface problems, and makes aerodynamicist’s experiences and physical models such as vortices or doublets be useless.

scholarly journals Numerical Performance Investigations of Screw Propellers by Lifting Surface Theory

2013 ◽  
Vol 48 (2) ◽  
pp. 246-252 ◽  
Author(s):  
Baris Bicer ◽  
Makoto Uchida
Keyword(s):  
Surface Theory ◽  
Lifting Surface ◽  
Numerical Performance
Sign in / Sign up

Export Citation Format

Share Document