直角分岐後の管内流動に関する実験的研究

抄録

The flow in a pipe downstream from a 90°branch was investigated using air-flow test equipment at Re≒1.5×10⁵. The tested pipe system was composed of a tee and a long elbow. Mean and fluctuating velocities were measured by hot wire probes. The test results clarified the flow pattern and the effective factors. The flow pattern downstream from the elbow depends on the elbow offset angles as the distance between the tee and elbow becomes short. The asymmetry of the profile of mean velocity U^^^-/V_m at the branch pipe inlet section increases as the distributing discharge ratio decreases. The mean velocity profile downstream from the elbow is almost independent of the distributing discharge ratio at the elbow offset angles of 0°and 90°. At the elbow offset angles of 90°and 180°, the turbulence intensity √(u^^^-2)//V_m downstream from the elbow increases as the distributing discharge ratio decreases.