Abstract
AbstractThe geometry and inlet conditions of diffusers determine their performance. Longitudinal velocity and without swirl velocity pro-files have been checked along the different diffuser passage heights × 0.1, × 0.2, × 0.4, × 0.6, × 0.8, and × 0.9 at different traverses along the length. In this present work, the CFD approach has been used to find the results by using the RNG k-\(\upepsilon\) turbulence model. Due to closeness with experimental results, the RNG k-\(\upepsilon\) turbulence model was adopted. The efficiency of an axial annular diffuser through a converging hub and diverging casing (CHDC) is investigated using Computational Fluid-Dynamics software with a cone angle of \({10}^{\uptheta }\) and different area ratios 2.25, 3.25, and 4.25. An investigation is being conducted for different experimentally obtained inlet velocity profiles in the flow regime. The flow inside an annular diffuser was investigated, and the calculated pressure coefficient was found to be nearly equal to the experimental/available data. In this research, the pressure recovery coefficient and axial velocity are considered.KeywordsAnnular diffuserConverging hub and diverging casing (CHDC)CFD softwarePressure recovery coefficientArea ratio
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