Pitot's tube anemometer is suitable for the measurement of subsonic wind velocity.
The measuring principle of Pitot's tube anemometer is obtained from the Bernoulli theorem for gases under the assumption of an adiabatic reversible process of an ideal gas.
Ordinarily, an approximate Mach number
M0 is measured by a Pitot's tube anemometer and is expressed as a power function of Mach number
M; that is, Mot is expressed as a power series of
M2, therefore, a somewhat complicated calculation is needed to obtain M by utilizing
M0.
In this paper, inversely, Mach number
M is directly expressed as a function of the above mentioned
M0 obtained experimentally. Accordingly, the calculation to obtain
M by measured
M0 is tolerably simplified.
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