О результатах аэродинамических расчётов осекольцевых конических диффузоров

Abstract

Comparative design investigations of axiannular divergent cones were carried out using the CFD-software. Turbulence models built-in into the CFD-software were used for the computations, in particular Spalart-Allmaras (S-A), k–ω Shear Stress Transport (k–ω SST), V2F. The aperture angle of the external by-pass of cones varied in the range of α = 11°–36°, while the cone expansion degree varied as n = 2–4. The data of CFD computations were compared with the known experimental curve obtained by Klein and confirmed by Zariankin, which divides the plane (α–n) into two regions: unseparated flow and separated flow regions. The region above this curve represents the separated flow in the cone at any combination of parameters (α–n), and the region below this curve represents the unseparated flow.