3 edition of Unsteady transonic aerodynamic and aeroelastic calculations about airfoils and wings found in the catalog.
Unsteady transonic aerodynamic and aeroelastic calculations about airfoils and wings
by National Aeronautics and Space Administration, Ames Research Center in Moffett Field, Calif
Written in English
|Statement||Peter M. Goorjian, Guru P. Guruswamy|
|Series||NASA technical memorandum -- 85986|
|Contributions||Guruswamy, Guru P, Ames Research Center|
|The Physical Object|
The influence of the airfoil thickness on aerodynamic loads is investigated numerically for harmonically pitching airfoils at low incidence, under the incompressible and inviscid flow approximation. Force coefficients obtained from finite-volume unsteady simulations of symmetrical 4-digit NACA airfoils are found to depart from the linear Cited by: 8. PREDICTION OF AERODYNAMICS LIFT REDISTRIBUTION ON FLEXIBLE WING STRUCTURE USING TRANSONIC UNSTEADY AERODYNAMIC CODE - NTRANS I Wayan Tjatra 1, M. Kadar2, Dwi Rahmawati3 Computational Aeroelastic Group, Aerospace Engineering Department Institute of Technology Bandung, Jl. Gane Bandung , Indonesia e-mail: [email protected]
This paper describes a finite-difference method for unsteady transonic flow computation in frequency domain and transonic flutter prediction of complete aircraft configurations. The unsteady TSD equation as well as the boundary conditions are split into the in Cited by: 2. Unsteady Aerodynamics and Trailing-edge Vortex Sheet of An Airfoil Xi Xia and Kamran Mohseni yz University of Florida, Gainesville, FL, , USA Unsteady ow models of wings and airfoils have been studied to understand the aerody-namic performance of natural yers and provide improved maneuverability for micro aerial vehicles (MAVs).File Size: 2MB.
Transonic aerodynamic characteristics of several bodies having elliptical cross sections and various plan forms / (Washington: National Aeronautics and Space Administration, ), by Robert A. Taylor and Ames Research Center (page images at HathiTrust). (source: Nielsen Book Data) Summary This textbook is a collection of technical papers that were presented at the 10th International Symposium on Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines held September , at .
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TRANSONIC UNSTEADY AERODYNAMIC AND AEROELASTIC CALCULATIONS ABOUT AIRFOILS AND WINGS Peter M. Goorjian and Guru P. Guruswamy Sterling Federal Systems Inc., Palo Alto, CA USA NASA Ames Research Center, Moffett Field, CA USA INTRODUCTION This article will survey some of the research in the area of computational unsteady transonic flows.
Compuiers S Structures Vol. 30, No. Printed in Gri Britain. /88 $+ Pergamon Press pic TRANSONIC UNSTEADY AERODYNAMIC AND AEROELASTIC CALCULATIONS ABOUT AIRFOILS AND WINGS PETER M. GooRJiANf and GURU P.
GURUSWAMY fNASA Ames Reseach Center, Moffett Field, CAU.S.A. ^Sterling Federal Systems, Inc., Palo Cited by: 4. Get this from a library. Transonic unsteady aerodynamic and aeroelastic calculations about airfoils and wings. [Peter M Goorjian; Guru P Guruswamy; Ames Research Center.].
Computational Unsteady Transonic Aerodynamics and Aeroelasticity About Airfoils and Wings Peter M. Goorjian and Guru P. Guruswamy (NASA-TM) CCMPUTATICLAL, UNSTEADY N 4 B ANSONIC AT% OD YB AHIC S ANJC AE6CE LAS%I;CI TY AEOUT AIRFOILS ANG WIhGS (EASA) 9 p CSCL 01A Uiiclas 63/02 43Y23 January National Aeronautics andAuthor: Peter M.
Goorjian, Guru P. Guruswamy. Why linear theory fails. Transonic flow over aircraft wings is inherently nonlinear, even in the limit of small disturbances.
The nonlinearities arise because (1) the geometry of the wing (thickness, camber, and airfoil type) and angle of attack enter the first-order perturbation solution in a nonlinear manner; and (2) the mixed subsonic flow-field with moving shocks cannot be modeled Cited by: The unsteady aerodynamics and aeroelastic responses under various flight conditions in a transonic flight regime are computed.
The results agree well with those obtained by using the training data. A computational procedure is presented to simulate transonic unsteady flows and corresponding aeroelasticity of wings at low-supersonic freestreams.
The flow is modeled by using the transonic small-perturbation theory. The structural equations of motions are modeled using modal equations of motion directly coupled with aerodynamics. Transonic Aerodynamics of Airfoils and Wings Introduction Transonic flow occurs when there is mixed sub- and supersonic local flow in the same flowfield (typically with freestream Mach numbers from M = or to ).
Usually the supersonic region of the flow is terminated by a shock wave, allowing the flow to slow down to subsonic File Size: 2MB. In this study, aerodynamic and aeroelastic results obtained by the unsteady, small-disturbance transonic code LTRAN3 are compared with the corresponding experimental results available from NASA"13 Unswept, rectangular, flexible wings with thin circular-arc airfoil sections are considered for flows in the transonic Mach number range.
[Mason] transonic aerodynamics of airfoils and wings 1. W.H. Mason 4/12/04 7. Transonic Aerodynamics of Airfoils and Wings Introduction Transonic flow occurs when there is mixed sub- and supersonic local flow in the same flowfield (typically with freestream Mach numbers from M = or to ).
Yang, T. Y., Guruswamy, P. and Striz, A. G., ‘Aeroelastic Response Analysis of Two-Dinunsional, Single and Two Degree of Freedom Airfoils in Low Frequency, Small-Disturbance Unsteady Transonic Flow’, AFFDL-TR–, References for Chapter 9 Google ScholarCited by: 8. The unsteady thin airfoil theory of von Karman and Sears is extended to analyze the aerodynamic characteristics of a deforming airfoil.
The von Karman and Sears approach is employed along with. Williams, M. H., ‘Unsteady Thin Airfoil Theory for Transonic Flows with Embedded Shocks’, Department of Mechanical and Aerospace Engineering, Report No.
Princeton University, May ; also AIAA Journal, Vol. 18 (), pp. ; also see ‘Unsteady Airloads in Supercritical Transonic Flows’, Proceedings of the AIAA/ASME/ASCE 20th Structures, Structural Dynamics and Materials Cited by: 8. The unsteady aerodynamic and aeroelastic analysis of flapping flight under various kinematics and flow parameters is presented in this dissertation.
The main motivation for this study arises from the challenges facing the development of micro air vehicles. Micro air vehicles by requirement are compact with dimensions less than cm and flight.
Transonic unsteady aerodynamic and aeroelastic calculations about airfoils and wings [microform] / Peter Unsteady transonic aerodynamic and aeroelastic calculations about airfoils and wings [microform] / Peter User's guide for ENSAERO--a multidisciplinary program for fluid/structural/control interaction studies o Computational unsteady.
Mason - Transonic Aerodynamics of Airfoils and Wings (DRAFT) - Free download as PDF File .pdf), Text File .txt) or read online for free.
Some numerical experiments are performed involving unsteady subsonic and transonic flows around a flat plate and a NACA airfoil, and the results are presented as curves of generalized aerodynamic forces. The unsteady simulations start from a converged. Goorjian PM, Guruswamy GP () Unsteady transonic aerodynamic and aeroelastic calculations about airfoils and wings.
AGARD-CP Google Scholar Guruswamy GP, Obayashi S () Transonic aeroelastic computations on wings using Navier–Stokes equations. Guru Guruswamy is an American engineer working as Principal Scientist at Ames Research Center since He pioneered research in the area of computational aeroelasticity that involves Unsteady Aerodynamics, Finite Element Methods, Computational Fluid Dynamics, Parallel Computing and Problem Solving Environment.
His innovative research was utilized in the first commercial 3-D computational. wings), it was found that the lift coefficient required for flight were much greater than the steady-state values that measured from dragonfly wings. This suggested that unsteady wing motions and flow interactions between the fore and aft wings must play important roles in the flight of dragonfliesCited by: 1.
Abstract Unsteady transonic flow theory is reviewed and classical results from the nonlinear asymptotic theory are combined with new results from computational fluid dynamics. The emphasis is on applications to the field of aeroelasticity and on clarifying the limitations of linearized theories in problems involving mixed subsonic-supersonic flows.Analytical, frequency-domain, unsteady aerodynamics theory, such as Theodorsen  and Garrick  theory, has proven quite useful in understanding aeroelastic stability and thrust generation.
However, Theodorsen and Garrick only modeled thin airfoils undergoing rigid body motion. Extending this unsteady aerodynamics theory to deformable.ically been used in unsteady aerodynamic validation efforts within the ﬁeld of aeroelasticity.
This choice of excitation relates to the aeroelastic foundation of the AePW. Experimentally, it is common for data at an instability to be dom-inated by an unstable (positive damping) sinusoid. An aeroelastic system is one where the aerodynamic.