Experimental investigation and predictive analysis of propeller tip vortex characteristics and its interaction noise

Karimian, Amin, Paruchuri, Chaitanya and Joseph, Phillip (2023) Experimental investigation and predictive analysis of propeller tip vortex characteristics and its interaction noise. In Proceedings of the AIAA Aviation 2023 Forum: Propeller, Rotorcraft and V/STOL Noise IV: Rotor Vortex/Turbulence Interactions. American Institute of Aeronautics and Astronautics.. (doi:10.2514/6.2023-3655).

Abstract

The findings of an experimental analysis of propeller wake and characterization of Tip Vortex as they developed downstream of a 2-bladed 16-inch propeller at hover condition are presented in this research. A detailed Hot-wire Anemometry measurements were performed in order to characterize the wake of the propeller. Ensemble averaging of the measured signals was performed at each measurement point. The tip vortecies were tracked, and their angular and spatial locations were identified along the axial distance from the propeller’s disc. A comparison between the existing analytical model for Tip Vortex evolution with experimental data is performed. The tip vortices are shown to travel to an axial distance of z/D = 0.2 while completing one full rotation. Axial instabilities occurred at z/D = 0.25 causing the two vortecies to merge. Strong attenuation of the spectral densities was observed downstream of the wake for all measured points across the blade’s radius. The Acoustic measurements of Tip Vortex-wing interactions and corresponding analytical model for broadband noise were performed and show that the Amiet model does to some extend predict the increase in the broadband noise between 100 Hz and 1 KHz.

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Contributors

Author: Amin Karimian

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