1. Measure the speed and direction of the average flow.
2. Measure the pulsating speed of the incoming flow and its frequency spectrum.
3. Measure the Reynolds stress in turbulent flow and the velocity dependence and time dependence of two points.
4. Measure the wall shear stress (usually with a hot film probe placed flush with the wall, the principle is similar to that of precision speed measurement).
5. Measure the fluid temperature (pre-measure the change curve of the probe resistance with the fluid temperature, and then determine the temperature according to the measured probe resistance.
