Accession Number : ADA118884

Title :   Time-Variant Aerodynamics for Translational Motion of Large-Turning Airfoils.

Descriptive Note : Final rept. Oct 80-Feb 82,

Corporate Author : GENERAL MOTORS CORP INDIANAPOLIS IN DETROIT DIESEL ALLISON DIV

Personal Author(s) : Jay,R L ; Gritton,M J ; Rothrock,M D

PDF Url : ADA118884

Report Date : Feb 1982

Pagination or Media Count : 144

Abstract : A cascade of five airfoil sections modelling the hub section of an advanced design turbine featuring a high inlet Mach number and 112 degrees of turning was evaluated at 4 steady-state conditions of varying exit Mach number and expansion ratio. The resulting steady-state airfoil surface pressures were compared to a state-of-the-art analytical prediction. A time-variant investigation was conducted at the 4 operating conditions of the steady-state experiment. Data from high response pressure transducers imbedded along the surfaces of the center airfoil was acquired by individually oscillating each airfoil of the cascade normal to its chord. From this data, the time-varying surface pressures as functions of interblade phase angle were quantified and compared with a current unsteady analysis. (Author)

Descriptors :   *Turbines, *Airfoils, *Aeroelasticity, *Cascades(Fluid dynamics), Aerodynamics, Steady flow, Vibration, Flutter, Turbine blades, Leading edges, Trailing edges, Mathematical prediction, Time, Variations, Test methods

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE