Wind Velocity Measurement by Pitot's Tube Anemometer

Abstract

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.