Forcing function effects on unsteady aerodynamic gust response. I - Forcing functionsThe paper investigates the fundamental gust modeling assumption on the basis of a series of experiments performed in the Purdue Annular Cascade Research Facility. The measured unsteady flow fields are compared to linear-theory gust requirements. The perforated plate forcing functions closely resemble linear-theory forcing functions, with the static pressure fluctuations small and the periodic velocity vectors parallel to the downstream mean-relative flow angle over the entire periodic cycle. The airfoil forcing functions exhibit characteristics far from linear-theory gusts, with the alignment of the velocity vectors and the static pressure fluctuation amplitudes dependent on the rotor-loading condition, rotor solidity, and the inlet mean-relative flow angle. It is shown that airfoil wakes, both compressor and turbine, cannot be modeled with the boundary conditions of current state-of-the-art linear unsteady aerodynamic theory.
Document ID
19930035403
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Henderson, Gregory H. (NASA Lewis Research Center Cleveland, OH, United States)
Fleeter, Sanford (Purdue Univ. West Lafayette, IN, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Subject Category
Aerodynamics
Report/Patent Number
ASME PAPER 92-GT-174
Meeting Information
Meeting: ASME, International Gas Turbine and Aeroengine Congress and Exposition