Numerical Simulation of Swirling Flows - Heat Transfer Enhancement

Abstract

In this paper, the influence of swirl number on mixing of two confined coaxial jets is analysed. The swirl generator is a set of fixed vanes located in the annular nozzle. Different trailing edge angles result in swirl numbers ranging from 0.14 to 0.95. Numerical model is validated using non reactive benchmarks. Low, intermediate and large swirling injectors are simulated to contrast the flow pattern. The presence of Inner Recirculation Zone associated to intermediate and high swirl numbers plays an important role in the heat and mass transfer since promote high gradients with minimum head loss. Low swirl injectors show large mixing regions in absence of the central vortex structure.