Numerical Assessment of Acoustic Installation Effects Characterizing NASA-LaRC Quiet Flow Facility using Computational AeroAcousticsReport as inadecuate




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1 Chatillon - ONERA - The French Aerospace Lab

Abstract : This paper presents a numerical assessment of acoustic installation effects characterizing the NASA Langley Quiet Flow Facility QFF, an open-jet, anechoic wind tunnel. Several Computational Aeroacoustics CAA calculations based on equivalent simplistic sources are conducted, enabling the estimation of the installation effects possibly induced by the QFF environment on the measured acoustic signatures during typical airframe noise experiments. First, the conclusions that had been previously made by the present author in an earlier assessment of QFF installation effects onto the so-called Tandem Cylinder experiments are reproduced. Then, these conclusions are extended to various situations which are more representative of the usual airframe noise tests that are typically conducted in the QFF. In particular, this provides an opportunity to compare the refraction-convection effects of the QFF jet flow to the reflection-diffraction induced by the experimental apparatus. All this further aids in the identification of acoustic installation effects that may be important in the type of testing typically done in the NASA-LARC QFF facility.

Keywords : ACOUSTIC INSTALLATION EFFECTS FACILITY COMPUTATIONAL AEROACOUSTICS CAA REFRACTION QFF NASA





Author: S. Redonnet -

Source: https://hal.archives-ouvertes.fr/



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