Accession Number : AD0700774

Title :   THEORY OF AIRFOIL RESPONSE IN A GUSTY ATMOSPHERE. PART II - RESPONSE TO DISCRETE GUSTS OR CONTINUOUS TURBULENCE,

Corporate Author : TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s) : Filotas,L. T.

Report Date : NOV 1969

Pagination or Media Count : 29

Abstract : The response of an infinite span airfoil in an arbitrary two-dimensional upwash field is studied analytically on the basis of the 'aerodynamic transfer function' giving the pressure distribution in an inclined sinusoidal gust derived in Part I (AD-700 773). When the upwash field can be completely specified (discrete gust case) the lift response is expressed as a quadrature involving the transfer function. When only statistical properties of the upwash can be specified (atmospheric turbulence) mean square values, correlation functions and power spectra are similarly expressed. Certain results are given in closed form. Expressions giving the transfer function in terms of correlations which may be determined experimentally are given. The detailed expressions deal with the lift response; however, the modification required for the pitching moment response is explicitly stated. (Author)

Descriptors :   (*AIRFOILS, *GUST LOADS), GUSTS, RESPONSE, TWO DIMENSIONAL FLOW, TRANSFER FUNCTIONS, PRESSURE, LIFT, PITCH(MOTION), MOMENTS, WINGS, TURBULENCE, CANADA

Subject Categories : Aerodynamics
      Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE