| Popis: |
In rough environments (train’s underbody, wind carrying sand etc.), the only feasible means of measuring flow speed is with a Pitot tube. Unsteady (gusty) flow effects can cause large errors in flow speed measurements. In this short communication work, an attempt has been made to identify these errors. Based on potential flow theory, a term that takes into account the unsteady effects has been proposed to correct the Pitot tube measurements in unsteady (gusty) flow conditions. Experiments have been performed in an open circuit-closed test-section, low-speed wind tunnel, designed and built at the Instituto de Microgravedad “Ignacio Da Riva” of the Universidad Politecnica de Madrid (IDR/UPM). Different types of Pitot tubes have been used to check the validity of the correction term proposed. It has been shown that the distance between the total and static pressure taps has a major influence on the Pitot tube correction term. |
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