Effect of the Geometry of a Swirl Generator on Energy Loss and Shockwave Position in Arina Nozzle

Abstract

To investigate the effect of the swirl generator (SG) on shockwave position and pressure drop, 3D simulation is conducted and validated by Arina's study. An increase of the blade number, height, and end angle leads to shockwave displacement toward the nozzle outlet. The maximum increment of the shockwave displacement, which is due to enlarging the angle of the blade end, is about 47 %. For this case, the pressure drop share of the SG is nearly half of the total pressure drop, while the residence time of particles is prolonged by about 51 %. As a general finding, increasing the swirl intensity provides a longer residence time to separate adequately the liquid from the gas. However, a higher energy loss is not desirable for the high-pressure process at the downstream of the 3S separator.

A novel strategy for comprehensive optimization of structural and operational parameters in a supersonic separator using computational fluid dynamics modeling

“…Wen et al 15 used the CFD modeling to investigate the influence of blade angles on the gas swirling behavior. Majidi and Farhadi 16 investigated the influence of swirler on the shockwave position. They observed that an increase in the blade number, height, and end angle resulted in the shockwave position shifted toward the nozzle outlet.…”