On the static pressure in fully-developed turbulent flow

Abstract

1-The present investigation has a twofold purpose: first, to obtain a measure of the effect of fully-developed turbulence on the reading of a static pressure tube; and second, to obtain information on the distribution of static pressure in the fully-developed turbulent flow in a pipe and in the wake behind a long cylindrical body. The work arose from a paper by DR. Goldstein on the measurement of total head and static pressure in a turbulent stream. 2-Static Pressure Tubes A static pressure tube of good design is one for which small local disturbances at the nose, arising from the introduction of the tube into the stream, have time to die away before the static holes are reached. The reading of such a tube in a steady stream depends on the shape of the nose, the distance of the holes behind the nose, and the distance of the supporting stem behind the holes. When the static holes are at least 6 tube-diameters behind the head, and the stem a least 15 stem-diameters downstream from the holes, the reading of the tube is independent, within wide limits, of the shape of the head.