4. Test and calculation resources

4.1 Test methods and equipment

In fluid metrology, there is a wide range of measurement methods, giving access to different quantities, mainly pressure, temperature and velocity. Among these methods, we can mention two types:

• intrusive methods, in which measurements are obtained by placing devices inside the flow, thereby disturbing it. Examples include Pitot tubes for measuring total pressure, or indirectly velocity, and hot wire for velocity measurement;

• non-intrusive methods, in which devices are used which do not disturb the flow, or at least at acceptable levels for the measurement. Optical measurements are generally considered non-intrusive. Among these, particle image velocimetry (PIV) and laser...