NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 75 of 11726
Energetics of oscillating lifting surfaces using integral conservation laws
Author and Affiliation:
Ahmadi, Ali R.(BBN Laboratories, Inc., Cambridge, MA, United States)
Widnall, Sheila E.(MIT, Cambridge, MA, United States)
Abstract: The energetics of oscillating flexible lifting surfaces in two and three dimensions is calculated by the use of integral conservation laws in inviscid incompressible flow for general and harmonic transverse oscillations. Total thrust is calculated from the momentum theorem and energy loss rate due to vortex shedding in the wake from the principle of conservation of mechanical energy. Total power required to maintain the oscillations and hydrodynamic efficiency are also determined. In two dimensions, the results are obtained in closed form. In three dimensions, the distribution of vorticity on the lifting surface is also required as input to the calculations. Thus, unsteady lifting-surface theory must be used as well. The analysis is applicable to oscillating lifting surfaces of arbitrary planform, aspect ratio, and reduced frequency and does not require calculation of the leading-edge thrust.
Publication Date: Jan 01, 1987
Document ID:
19870035200
(Acquired Nov 28, 1995)
Accession Number: 87A22474
Subject Category: AERODYNAMICS
Report/Patent Number: AIAA PAPER 87-0193
Document Type: Preprint
Publisher Information: United States
Contract/Grant/Task Num: NGR-22-009-818
Financial Sponsor: NASA; United States
Organization Source: Massachusetts Inst. of Tech.; Cambridge, MA, United States
Bolt, Beranek, and Newman, Inc.; Cambridge, MA, United States
Description: 23p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CONSERVATION LAWS; INCOMPRESSIBLE FLOW; INVISCID FLOW; LIFTING BODIES; WING OSCILLATIONS; FLOW VELOCITY; LEADING EDGES; PROPULSIVE EFFICIENCY; VORTEX SHEDDING; WAKES
Imprint And Other Notes: AIAA, Aerospace Sciences Meeting, 25th, Reno, NV, Jan. 12-15, 1987. 23 p.
Availability Source: Other Sources
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 18, 2011
Contact Us