Surface static pressure distributions can be measured by embedded surface pressure taps. The aerodynamic surfaces are either instrumented by drilled holes and metal pipes or models with embedded pressure taps are manufactured by rapid prototyping methods. With a typical rapid prototyping by stereolithography (SLA) the surface pressure tap diameter is 1.2 mm and the diameter of the connecting lines is 1.6 mm. A know-how of the laboratory is a custom quick mount connector which can be directly attached to an embedded counterpart in a model. The quick mount connector is directly embedded in the model and an example of the surface pressure data from the pressure taps is shown as well. Normal recommendation are to keep the number of channels below 146, but more can be used but this requires manually change the port configuration.
Figure 4.9. An OGV with embedded pressure taps (left), the embedded quick mount connector (middle), measured static pressure coefficient distribution (right).