Mono-Dispersed Water Droplet Delivery in a Small-Scale Refrigerated Wind Tunnel

摘要

A numerical investigation of several droplet delivery tubes designed for a small-scale refrigerated wind tunnel is presented. A hybrid RANS/LES strategy was employed to model the resulting unsteady, turbulent flow in the tunnel. In terms of delivering droplets to the tunnel airflow, numerical results show that a composite tube design, with a pressure relief slot and an inner tube, was preferable to a simple tube design with no slot and no inner tube. Alternative tube cross sections selected to reduce the turbulent wake were also investigated. The results demonstrated that using an NACA0030 airfoil as the cross section of the droplet delivery tube significantly reduced scatter in the droplet trajectories thereby improving reliability of droplet delivery to the test section.