Intensity of turbulence in the direction of the average speed

The intensity of turbulence in the direction of the average speed is defined as

As we have seen, Equation (3.15), in a CTA, King’s law can be written as:

Подпись: 2EdE Подпись: в Подпись: dU

E1 = A + в4й = e2 + вій By differentiating this equation:

Подпись: = 4EV7 U = E - E

Interpreting E and U as the average values of voltage and speed and the differentials dE and dU as their rms values, a peculiar expression for the intensity of turbulence, may be found:

In order to measure the intensity of turbulence, it is only necessary to know the output voltage and the rms value of voltage, it is not necessary to know the calibration curve.

If the relationship E(U) is linearized, E = KU, to determine the intensity of turbulence, it is sufficient to make the ratio of the rms and the average value of voltage:

T = dU = dE 47

T U E E

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