Study of ComPressible High Speed Gas Flow in Piping System : 1st Report, Piping Systems with Bends or Elbows

Abstract

The effect of compressibility at subsonic speed in piping systems with bends or elbows is studied in this report. Experiments are carried out with varying deflection angle, relative radius of curvature, inner surface roughness as well as the flow Mach number. The effect of compressibility on Kt, the loss coefficient of bends or elbows, is expressed by the following empirical formulas, Kt/Kti=1.0+αM³, where the subscript i refers to an incompressible flow, and α, β are constants dependent of configurations of bends or elbows. Furthermore, flow patterns around curved parts are visualized by Finally, a practical computing method of flow losses of high speed piping system is summarized.