Numerical Unsteady Aerodynamic Simulator for Blade Forced Response Phenomena.

Abstract

This report describes the application of a modem, time-accurate, Euler/Navier-Stokes analysis to the prediction of unsteady subsonic and transonic flows through a two-dimensional cascade. In particular, unsteady flows excited by harmonic, pure torsional and pure bending vibrations of the blades of the Tenth Standard Cascade. The purpose of this study is to validate the Euler/Navier-Stokes analysis along with an existing linearized inviscid analysis for unsteady flows that are representative of those associated with blade flutter in modem fans and compressors. The analysis is also applied to determine the relative importance of nonlinear and viscous effects in the unsteady response of a cascade to prescribed blade motions. The results of the study indicate a close agreement between inviscid and viscous blade loadings for unsteady subsonic flows. For unsteady transonic flows, shocks and their motions introduce significant nonlinear or second and higher harmonic contributions to the local unsteady response.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1994
Accession Number
ADA298470

Entities

People

  • J. M. Verdon
  • T. C. Ayer

Organizations

  • United Technologies Corporation

Tags

DTIC Thesaurus Topics

  • Agreements
  • Compressors
  • Flow
  • Fluid Flow
  • Simulators
  • Standards
  • Subsonic Flow
  • Transonic Flow
  • Two Dimensional
  • Unsteady Flow
  • Vibration

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Computational Fluid Dynamics (CFD)
  • Structural Dynamics.