Numerical Analysis of the Flow and Sound Fields of a Round Jet

This paper presents a computational investigation into the aeroacoustics properties of a low-Reynolds-number cold jet flow. The study focuses on a turbulent jet characterized by a Mach number of ۰.۹ and a Reynolds number of ۳۶۰۰. To tackle this complex problem, we employed a hybrid computational approach, which integrates Large Eddy Simulation (LES) with the Ffowcs Williams and Hawkings (FW-H) method. Additionally, we optimized computational efficiency by utilizing a coarse grid, reducing computational time by approximately one-third while still maintaining accuracy. Despite this grid coarsening, the study yielded highly favorable outcomes, exhibiting strong agreement with experimental data. Particularly noteworthy were the consistent replication of jet turbulence characteristics such as development and intensity and accurate prediction of acoustic phenomena compared to experimental observations. This research offers significant insights into the aeroacoustics behavior of low-Reynolds cold jets, emphasizing the efficacy of a hybrid computational approach for such analyses. The implications of these findings extend to the potential enhancement of aircraft engine design for reduced noise emissions and improvements in similar systems.

کلیدواژه ها:

Round jet ، Turbulence jet ، LES ، CAA ، FW-H