The Measurement of Air Flow by E. Ower, R. C. Pankhurst

By E. Ower, R. C. Pankhurst

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Specifications are on the market with both hemispherical and ellipsoidal noses, and, subject to the margins of error quoted above, can be used without calibration. As a general rule, the engineer will prefer the latter type, whose calibration is less sensitive to small inaccuracies of profile, and so should be more easily reproducible from one instrument to another made to the same design. More important than exact compliance with dimensional specifications is reasonable care in manufacture to ensure smoothness of contour with no reversals of curvature anywhere along the nose.

The circular disk shown near the end of the stem in Fig. 3 was provided to simplify mounting the whole instrument in a wind tunnel ; it is generally omitted, without effect on the factor of the instrument, in modern designs for use in pipes or ducts. The value of D was 7-8 mm. Several of the leading dimensions were chosen to be round values in inches or fractions of an inch. 25 CHARACTERISTICS OF PITOT AND STATIC TUBES generally attached to a stem at right angles, which is held by a suitable streamline support or projects through the side of the pipe or duct in which measurements are being made, and carries the pressure connexions leading to the manometer.

GOODMAN, A new design of pitot-static tube, with a discussion of pitot-static tubes and their calibration factors, R. & M. 3365 (1965). S. 1042: 2A : 1973, Methods for the measurement of fluid flow in pipes. Part 2. Pitot tubes. Class A accuracy, British Standards Institution, London (1973). H. E. DALL, Withdrawable pitot devices for pipelines, Instrum. Engr 3 (1962) 135. H. f Flugtechnik u. Motorluftschiffahrt 22 (1931) 321. A. H. GLASER, The pitot cylinder as a static pressure probe in turbulent flow, / .

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