PERFORATED PLATE AERODYNAMICS FOR PASSIVE SHOCK CONTROL

Transpiration flow through perforated walls plays ever increasing role in aerodynamics due to a frequent application of the flow control by means of blowing or suction. An experimental study is presented here which allowed to determine a transpiration flow characteristic in a form of a simple function. It is very useful for modelling of such flows. Additionally a method of “aerodynamic porosity” determination was proposed which is much more reliable than geometrical description of the porosity. A theoretical analysis of the flow through a perforation hole was also carried out. The flow is considered as compressible and viscous. The gasdynamic analysis led us to a very similar result as obtained from experiment.