Experimental study on pressure distributions around a circular cylinder in the branch of a T-junction

The mean pressure distributions of a single circular cylinder in the branch of a T-junction are experimentally investigated with intelligent pressure scanners (PSI 9116) in wind tunnel. Experimental data of the circular cylinder in a straight duct are conducted to provide a benchmark. Mean pressure distributions of the circular cylinder are obtained at different positions along streamwise direction under the velocity ratio (R) ranging from 0.117 to 0.614. Two dimensionless parameters including correlation coefficient (σ) and amplitude ratio (AR), are defined to analyse the pressure characteristics around the circular cylinder. In the T-junction, the pressure coefficients around a cylinder are suffered different influence at different positions, which is analysed in detail, and the level of the influence gets more and more weaken as the increase of the distance from the suction junction to the cylinder centre (z/Dh) until up to the benchmark. The change regulations of the main features included the front stagnation point, the rear stagnation point and the separation points are also presented.