The 6th International Conference on Power and Energy Systems Engineering (CPESE 2019), September 20–23, 2019, Okinawa, Japan Performance analysis of annulus diffusing area with divergent dimpled tube

摘要

Flow properties and performances are analyzed in an annulus-diffusing channel with divergent dimpled tube DDT. 3-D Computational Fluid Dynamics CFD has been achieved to study the flow characteristics. The standard k-e turbulence model is employed in the numerical simulations. The main goal of the study is to present details of flow field characteristics and velocity distribution enhancement of the flow in an annulus-diffusing channel fitted with DDT. The effects of three different area ratios ARs (2, 2.5 and 3) on the flow performance have been discussed. The velocity structure in terms of radial velocities and pressure structures is studied by using commercial software ANSYS. Area ratios (ARs) and Reynolds number (Re) 62393 are achieved as governing parameters. The results show that the velocity and pressure performance is strongly affected by the insertions of dimples. The velocity values decrease and the pressure drop increases with an increasing area ratio through the diffusing channel. Therefore, increasing area ratio AR increases model performance.