چكيده به لاتين
Abstract
Today, the study of turbulent flow aeroacoustics is of great importance to researchers and scholars. In fact, due to the movement of moving and generally rotating objects in the vicinity of the fluid, a pressure and velocity field is created that creates a kind of disorder and turbulence in the fluid. The movement of turbulent flow vortices, their merging or breaking in the fluid flow, causes the generation of sound waves. In many cases, the sound generated can have destructive effects on the use of a mechanical component. In this study, the simultaneous aerodynamic and aeroacoustic performance of a commercial propeller called A10-10-APC in a fluid environment is studied. Propeller engines are of particular importance in the aviation industry due to their high efficiency compared to other engines. With the help of numerical simulations performed with the help of ANSYS software, the mass and momentum conservation equations, as well as the governing equation for sound propagation, are analyzed. In addition, in order to accurately study the behavior of eddies created in turbulent flow, the LES model is used to examine sound propagation with good accuracy. In the following, the presented results are verified with the help of experimental results presented at a turbulence intensity of 4.9% and a progress factor of 0.47. Finally, an attempt has been made to investigate the role of the main physical parameters on the sound propagation rate. It should be noted that in this study, for the first time, the simultaneous effect of the propeller geometry and the physical conditions of the fluid passing through it on its aerodynamic and aeroacoustic performance was evaluated; therefore, blades with NACA0012 and NACA0018 cross-sections were also simulated. The obtained results indicate that the A10_10 APC propeller has higher aerodynamic efficiency and produces less noise than the other propellers studied. The results of this study showed that with the increase in the advance coefficient from 0.47 to 0.92, the propeller efficiency has an upward trend, but its thrust coefficient graph shows a downward trend. Also, with the change in turbulence intensity from 4.9% to 10%, an approximate increase of 3.5% in the total propeller efficiency was observed, and the thrust coefficient and power coefficient also increase by 0.6 and 0.2, respectively. Therefore, it can be claimed that with the increase in the turbulence intensity of the flow, the aerodynamic performance of the propeller has improved.
