A Linear Aerodynamic Analysis for Unsteady Transonic Cascades
Author : Joseph M. Verdon
Publisher :
Page : 84 pages
File Size : 39,72 MB
Release : 1984
Category : Aerodynamics, Transonic
ISBN :
Author : Joseph M. Verdon
Publisher :
Page : 84 pages
File Size : 39,72 MB
Release : 1984
Category : Aerodynamics, Transonic
ISBN :
Author : Joseph M. Verdon
Publisher :
Page : 84 pages
File Size : 28,6 MB
Release : 1984
Category : Aerodynamics, Transonic
ISBN :
A potential flow analysis to predict unsteady airloads produced by the vibrations of turbomachinery blades operating at transonic Mach numbers is presented. The unsteady aerodynamic model includes the effects of blade geometry, finite mean pressure variation across the blade row, high frequency blade motion, and shock motion within the framework of a linearized, frequency domain formulation. The unsteady equations are solved implicit, least squares, finite difference approximation which is applicable on arbitrary grids. A numerical solution for the entire unsteady field is determined by matching a solution determined on a rectilinear type cascade mesh, which covers an extended blade passage region, to a solution determined on a detailed polar type local mesh, which covers and extends well beyond the supersonic region(s) adjacent to a blade surface. Cascades of double circular arc and flat plate blades demonstrate the unsteady analysis, and partially illustrate the effects of blade geometry, inlet Mach number, blade vibration frequency and shock motion on unsteady response.
Author : Joseph M. Verdon
Publisher :
Page : 84 pages
File Size : 18,31 MB
Release : 1981
Category : Aerodynamic load
ISBN :
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 266 pages
File Size : 38,37 MB
Release : 2018-07-23
Category :
ISBN : 9781723509063
The steady and unsteady aerodynamics of a linear oscillating cascade are investigated using experimental and computational methods. Experiments are performed to quantify the torsion mode oscillating cascade aerodynamics of the NASA Lewis Transonic Oscillating Cascade for subsonic inlet flowfields using two methods: simultaneous oscillation of all the cascaded airfoils at various values of interblade phase angle, and the unsteady aerodynamic influence coefficient technique. Analysis of these data and correlation with classical linearized unsteady aerodynamic analysis predictions indicate that the wind tunnel walls enclosing the cascade have, in some cases, a detrimental effect on the cascade unsteady aerodynamics. An Euler code for oscillating cascade aerodynamics is modified to incorporate improved upstream and downstream boundary conditions and also the unsteady aerodynamic influence coefficient technique. The new boundary conditions are shown to improve the unsteady aerodynamic influence coefficient technique. The new boundary conditions are shown to improve the unsteady aerodynamic predictions of the code, and the computational unsteady aerodynamic influence coefficient technique is shown to be a viable alternative for calculation of oscillating cascade aerodynamics. Buffum, Daniel H. and Fleeter, Sanford Glenn Research Center NASA-TM-103250, E-5677, NAS 1.15:103250 RTOP 535-05-01...
Author : Joseph M. Verdon
Publisher :
Page : 84 pages
File Size : 26,4 MB
Release : 1981
Category : Aerodynamic load
ISBN :
Author : Joseph M. Verdon
Publisher :
Page : 64 pages
File Size : 44,74 MB
Release : 1986
Category : Cascades (Fluid dynamics)
ISBN :
Author : J. M. Verdon
Publisher :
Page : 64 pages
File Size : 38,19 MB
Release : 1986
Category : Cascades (Fluid dynamics)
ISBN :
Author :
Publisher :
Page : 892 pages
File Size : 18,58 MB
Release : 1994
Category : Aeronautics
ISBN :
Author : Joseph M. Verdon
Publisher :
Page : 72 pages
File Size : 25,20 MB
Release : 1990
Category : Cascades (Fluid dynamics)
ISBN :
Author :
Publisher :
Page : 684 pages
File Size : 40,64 MB
Release : 1989
Category : Aerodynamics, Transonic
ISBN :