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Effects of pitot tube on the measurement of supersonic flow

The time averaged velocities in fluid flow can be measured simply and conveniently by investigating the effect of the pitot tube in supersonic flow. The contrastive numerical simulation between the free supersonic air flow and the pitot tube at different positions in supersonic air flow was performed using the N S equation, second order accurate finite volume method, and Spalart Allmaras turbulence model. The numerical results of the influence of the pitot tube on supersonic flow structure show that the measurement error of supersonic flow structure by using pitot tube in determinate region is small, but the error is large in the transition region from supersonic to subsonic velocity.