EXPERIMENTAL INVESTIGATION OF DISCHARGE COEFFICIENT AND TAPPING ERROR OF PTC 6 FLOW NOZZLE USING HIGH REYNOLDS NUMBER CALIBRATION RIG

N. Furuichi, K. H. Cheong, Y. Terao, S. Nakao, K. Fujita, K. Shibuya

Abstract

A tap effect of a discharge coefficient of a throat tap flow nozzle based on PTC 6 is investigated by measuring the discharge coefficient in 1.8 &times; 10⁵ < <i>Re</i>_d < 1.4 &times; 10⁷. The measurement error of the differential pressure, when it is normalized by a wall shear stress including the effect of roughness caused by the hole of a tap, is described as a function of tap Reynolds number based on the friction velocity and the tap diameter. The equation of the discharge coefficient of the flow nozzle is proposed, which consists of the two terms that can be physically evaluated, the theoretical discharge coefficient and the measurement error of differential pressure.

Keywords

discharge coefficient, tapping error, PTC 6 flow nozzle, high Reynolds number, calibration

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IMEKO TC

TC9 - Flow Measurement

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