Abstract: Owing to failing to take the friction on the side wall into account, Barnwell's correction rule for sidewall interference in two-dimensional wind tunnel is, in therotician view, imperfect. To improve this, a corresponding modification on the Barnwell's rule has been made in this study; in which the sidewall boundary layer is reconsidered by means of the Karman-Pohlhausen method; the wall friction is represented in terms of the velocity gradient and therefore, the troubles faced in the correction with the friction are overcome. Based on this, a noval correction rule is formulated. The influence of the friction is reflected by the Pohlhausen parameter A of the boundary layer. The less the absolute value of A is, the greater the influence of the friction is. In addition, choice of the relevant parameter, such as δ , in the correction and turbulent case are briefly discussed.

Key words: two-dimensional wind tunnel, wall interference, wall interference correction