Propeller installation effects on turboprop aircraft acoustics

Chirico, Giulia; Barakos, George N.; Bown, Nicholas

doi:10.1016/j.jsv.2018.03.003

Cited by 31 publications

(13 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the SPL spectra shows that wing-1 benefits acoustically over wing-2, while it also benefits aerodynamically by experiencing a larger lift for most of the conditions [49]. This is different from the trend observed by Chirico et al [37], probably due to the different configuration in that study. While low and mid θ represent relatively similar trends and levels of fluctuation, high θ shows a significantly different pattern, with larger fluctuations, leading to a higher level of SPL.…”

Section: Noise On the Wings And Fuselagecontrasting

confidence: 56%

“…Studies have also shown the rotation direction of multiple rotors affects the noise generation when lifting surfaces such as wings are immersed in the propeller wakes. For instance, the CFD analysis of two counter-rotating propellers interacting with a wing, conducted by Chirico et al [37] showed that the topin layout results in lower noise generation while the top-out layout provides a better aerodynamic efficiency due to the swirl effect.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Computational Study on the Aeroacoustics of a Multi-Rotor Unmanned Aerial System

2021

View full text Add to dashboard Cite

The noise generated by a quadrotor biplane unmanned aerial system (UAS) is studied computationally for various conditions in terms of the UAS pitch angle, propellers rotating velocity (RPM), and the UAS speed to understand the physics involved in its aeroacoustics and structure-borne noise. The k-ω SST turbulence model and Ffowcs Williams-Hawkings equations are used to solve the flow and acoustics fields, respectively. The sound pressure level is measured using a circular array of microphones positioned around the UAS, as well as at specific locations on its structure. The local flow is studied to detect the noise sources and evaluate the pressure fluctuation on the UAS surface. This study found that the UAS noise increases with pitch angle and the propellers’ rotating velocity, but it shows an irregular trend with the vehicle speed. The major source of the UAS noise is from its propellers and their interactions with each other at small pitch angle. The propeller and CRC-3 structure interaction contributes to the noise at large pitch angle. The results also showed that the propellers and structure of the UAS impose unsteadiness on each other through a two-way mechanism, resulting in structure-born noises which depend on the propeller RPM, velocity and pitch angle.

show abstract

Section: Noise On the Wings And Fuselagecontrasting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

A Computational Study on the Aeroacoustics of a Multi-Rotor Unmanned Aerial System

2021

View full text Add to dashboard Cite

show abstract

“…An additional circular drum level between the blades and main/tail wings is introduced to improve the interpolation. props [34], the mesh resolution presented in Table 4 is seen to be adequate for resolving the tonal noise component both on and off-body, which is our main concern. In addition, we are looking at differences between cases instead of absolute values.…”

Section: Grid Generationmentioning

confidence: 95%

“…The propeller rotational velocity is applied via the rigid body rotation with an updated reduced frequency required based upon the tip and freestream veloci- blades, between the starboard and port sides, was kept constant throughout the simulations. The counter rotation was selected based upon past experience with turbo-prop aircraft [34] and the design of the A400 Atlas. A full optimisation study of the propeller rotation for this configuration would be required for both aeroacoustics and aerodynamics.…”

Section: Simulation Setupmentioning

confidence: 99%