Correction of the wall interference effects in wind tunnel experiments

摘要

A procedure for the correction of wall interference effects is applied to lift and pitching moment coefficients, measured over a complete aircraft configuration in subsonic conditions in the High Speed Wind Tunnel (CSIR Laboratories). A "post-test" method is used, based on pressure measurements over the wind tunnel walls. The location of the sensors for pressure measurements is chosen following a previous numerical sensitivity analysis. In particular, pressure is evaluated in 320 points. Those values are interpolated linearly in the longitudinal direction, while cubic splines and parabolic laws are used in the cross section. The correction is obtained as the difference between the values given by two numerical simulations: in the first one the flow over the model in "free-air" conditions is simulated, while, in the second one, the measured pressure values over the wind tunnel walls are used as boundary conditions. A potential flow solver, whose accuracy was evaluated in several previous works, has been used. As a first validation, the results are compared with those obtained with a "pretest" correction method, and a satisfactory agreement is obtained.