Abstract:

The accelerating airflow problem in the transonic test section with perforated wall is investigated from three aspects.（1）The axial distribution of porosity;（2）The determination of design parameters in the front of accelerating section;（3）The investigation of the region of influence.Assuming that the axial pressure drop and the cross-flow velocity in a mass-flow nozzle is equal to those in the solid wall nozzle, a formula for calculating the open-area ratio of the mass-flow nozzle can be deduced. It is found that the predicted values of the o.pen-area are consistent with those measured ones. Hence, the formula can be utilized to design the open-area ratio distribution of the mass-flow nozzle.

Key words: wind tunnel technique, transonic wind tunnel, transonic test section