Wake vortices in wind tunnels disrupt flow uniformity, reduce measurement accuracy and impact aerodynamic performance, complicating data interpretation and reliability. This research addresses the challenge of wake control in a rotating test flow field by introducing a novel device: a rotating-arm apparatus equipped with a rectifier grille structure. The research aims to evaluate the effectiveness of this rectifier grille in mitigating wake vortices generated by the test model, thereby enhancing the overall stability and uniformity of the flow field.
The research uses a multi-step approach to model the airflow in an enclosed rotating-arm test apparatus. A sealed test chamber equipped with thermal insulation simulates controlled, low-temperature and low-pressure conditions. Using a multi-reference frame technique, the computational domain is divided into rotating and stationary sections, each governed by distinct flow control equations. The rectifier grille, with precise dimensions, and the test model are centrally positioned within the flow domain. Structured and unstructured grids, created in integrated computer engineering and manufacturing (ICEM) and Fluent, and Fluent, were refined around critical areas to enhance accuracy. Numerical simulations were conducted in Fluent 2021, using the realizable k–ε model and the coupled algorithm for robust convergence.
The study found that the rotating geometric model’s wake vortex negatively impacted flow field stability and uniformity. However, incorporating a rectifier grille significantly improved velocity uniformity, reduced flow irregularities and enhanced flow directional stability. The grille also helped homogenize centrifugal forces, yielding a more uniform pressure distribution and reducing load variability on apparatus components. These modifications, particularly effective under low-speed conditions, enhance flow field stability, optimize fluid dynamics and improve equipment performance.
This research not only contributes to the understanding of wake vortex dynamics but also offers practical implications for optimizing flow conditions in various engineering applications, ultimately improving the performance and reliability of aerodynamic testing.
