RESEARCH OF IMPACT OF THE VERTICAL FLOW ON THE DOWNSTREAM OF THE PIPE

Abstract

The results of an experimental study of the factors influencing the velocity distribution in the trapezoidal outlet channel along a vertical shaft combined with a horizontal pipe are presented. Two schemes of construction were considered separately: scheme 1 with the location of the vertical shaft at a distance of less than 2/3 of the pipe length; schema 2 with the location of the shaft at the end of the main pipe. The model was studied the distribution of averaged, surface and bottom velocities in the outlet channel. The study confirmed the theoretical conclusion and found that the nature of the velocity distribution, both vertically and plan are functions of water depth in the channel and velocity in the outlet section of the pipe and are independent from the flow ratio in the horizontal pipe and the vertical shaft, except of the case placing the vertical tube on the end of the horizontal pipe.As a result of the mathematical processing of the experimental data, empirical equations of the lengths of the transformed sections of the bottom and surface averaged flow velocities were developed for different values of the dimensionless flow parameter depending on the water level of the outlet channel.