Flow characteristics of a symmetric Y-shaped diffusing duct with zero yaw angle

Abstract

An experimental investigation of a Y-shaped diffusing duct with an aspect ratio and area ratio of 2 and turning angle of 22.5°/22.5° is reported for flow and performance characteristics. A calibrated five-hole pressure probe in null mode is used to measure the flow parameters. The performance parameters are evaluated based on mass-averaged quantities. It is observed that the static pressure recovery coefficient and the total pressure loss coefficient increase continuously up to the exit of the diffusing duct at a constant rate. It is also observed that the flow is divided into two flow regimes whereas at the merger, the two streams mixed with each other resulting a centrally core flow with almost uniform intensity and a pair of vortices. The longitudinal velocity distribution at the exit is seen to be nearly uniform.