Wall Interference Assessment and Corrections for Transonic Adaptive Wall Airfoil Data

摘要

A nonlinear, 4-wall, post-test wall interference assessment/correction (WIAC) codes is developed. This code is applicable to transonic airfoil data from solid-wall wind tunnels with flexibly adaptable top and bottom walls. The WIAC code has been applied to several sets of NACA 0012 airfoil data, including many fully adapted test points. The data represent a broad range of model/tunnel configurations and possible wall-interference effects. Small corrections to the measured Mach numbers and angles of attack are obtained from the WIAC code even for fully adapted data; these corrections generally improve the correlation among the various sets of airfoil data. Application, with no optimization, of the WIAC code to fully adapted data has unfortunately been more difficult and time consuming than initially expected from similar previous experience with WIAC application to slotted-wall data. In several instances, however, the WIAC corrections for partially to fully adapted wall airfoil data are shown to be significantly smaller than those for comparable straight, solid- and slotted-wall cases. This indicates a lesser degree of wall interference present in these adapted wall cases.