An Experimental Study on the Aerodynamic and Aeroacoustic Performances of a Bio-Inspired UAV Propeller

Ning, Z.; Hu, Hui

doi:10.2514/6.2017-3747

Cited by 28 publications

(11 citation statements)

References 14 publications

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“…[157]. The advantages of PIV in obtaining either statistical or time-resolved information in 2D and 3D are assessed also in many industrial configurations for the study of landing-gear noise (as for example by Neuhart et al [158] and Brès et al [159]) or for rotor configurations [160][161][162][163][164][165]. In figure 13, the results from Wang et al [166] show a peculiar usage of PIV measurements.…”

Section: Seeing the Inaudible: Quantification Of Hydrodynamic Flow Fl...mentioning

confidence: 99%

Measurement techniques for aeroacoustics: from aerodynamic comparisons to aeroacoustic assimilations

Ragni¹,

Avallone²,

Casalino³

2022

Meas. Sci. Technol.

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Sustainability has encouraged studies focusing on lowering the aeroacoustic impact of new aerodynamically optimized mechanical systems for several applications in wind energy, aviation, automotive and urban air mobility. The deployment of effective noise reduction strategies start with a deep understanding of the underlying mechanisms of noise generation. To elucidate the physics behind the formation of aerodynamic sources of sound, experimental techniques used for aerodynamic purposes have been combined with acoustic measurements. In the last decades, new experimental post processing techniques have additionally been developed, by leveraging aeroacoustic analogies in a new multi disciplinary framework. New approaches have been developed with the intent of translating near field velocity and pressure information into sound. The current review describes how such breakthroughs have been achieved, briefly starting from an historical overview, to quickly bridge to the measurement techniques and the facilities employed by the scientific community. Being the measurement principles already reported in literature, this review only focuses on the most relevant studies trying to relate near field information to the perceived sound in the far field. Aspects related to the uncertainty of the measurement techniques will be thus very briefly discussed, together with their relation to the background noise of the testing facilities, including acoustic reflections/refractions, and issues due to installation of the instrumentation.

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Section: Seeing the Inaudible: Quantification Of Hydrodynamic Flow Fl...mentioning

confidence: 99%

Measurement techniques for aeroacoustics: from aerodynamic comparisons to aeroacoustic assimilations

Ragni¹,

Avallone²,

Casalino³

2022

Meas. Sci. Technol.

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“…Based on Ning and Hu, 21 the chord length from the largest chord on the planform to the propeller’s tip decreased linearly. It was calculated by Cr=Ctip/r, where Cr is the chord length at the corresponding radius location, and r represents a non-dimensional radial distance.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Hintz et al 20 presented experimental research findings to determine the influence of a bio-inspired blade planform on small-scale propeller thrust and energy consumption. Ning and Hu 21 examined a small propeller’s aerodynamic and aeroacoustic properties with a novel planform shape inspired by the maple seed by comparing it to a typical baseline propeller in hover flight. They showed that the bioinspired propeller could provide equivalent thrust with constant power input while emitting less noise.…”

Section: Introductionmentioning

confidence: 99%

“…23 The tip vortex adds significantly to the lift generated by a flat plate with an aspect ratio and motion amplitudes equal to those seen in nature, according to experimental studies. 24 Ning and Hu 21 showed that the majority of the thrust for a rotary-wing is known to be created between 50% and 90% of the propeller radius, and at Reynolds numbers ranging from 10,000 to 100,000, the lift to drag ratio dramatically increases as the Reynolds number increases. As shown in Figure 2, these bioinspired wing planforms appear to be more compatible with the lift distribution, where the largest chord length is in the high lift area.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation into the aerodynamic and aeroacoustic performance of bioinspired small-scale propeller planforms

Moslem

Masdari

Fedir

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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The multi-rotors have a limited operational period and generate too much noise, which is insufficient for complex tasks and adversely affects humans’ and animals’ health. Nevertheless, their market has become increasingly popular. Therefore, low-noise products are more competitive, and aerodynamic and acoustic improvements are critical. This investigation aims to design a small bioinspired propeller with the same power input as a conventional propeller to achieve the same or better aerodynamic performance while decreasing noise. Accordingly, an experiment investigated the impacts of operation conditions and varied geometric parameters on six small propellers' aeroacoustic performances with a unique planform shape inspired by five insects and one plant seed, such as Blattodea, Hemiptera, Hymenoptera, Neuroptera, Odonata, and maple seed. Each propeller was operated at eleven rotational speeds ranging from 3000 to 8000 RPM with no freestream velocity for simulating hover conditions. Compared to the baseline propeller, the results demonstrate that all bioinspired propellers produce more thrust for the same power supply, reduce harmonic and broadband noise, and provide a better noise level. Also, their rotational speed is lower and their figure of merit is higher than the baseline propeller at hover flight with 3N thrust. They all outperform the baseline propeller in terms of hover efficiency at all thrust values considered. Besides, the Neuroptera propeller is more efficient than other propellers, decreasing 5.5 W of power and reducing 7.9 dBA at hover flight with 3N thrust and 1.5 meters distance, compared to the baseline propeller.

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“…An innovative bio-inspired UAV propeller is investigated in Ning. [72]. By taking idea from nature and designing a propeller with the planform shape based on cicada wings and maple seeds (see Fig.8(b)).…”

Section: Bio-inspired Blade Shapementioning

confidence: 99%

Small-Scale Rotor Aeroacoustics for Drone Propulsion: A Review of Noise Sources and Control Strategies

Candeloro¹,

Pagliaroli²,

Ragni³

et al. 2019

Preprint

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In the last decade, the drone market has grown rapidly for both civil and military purposes. Due to their versatility, drones demand is constantly increasing, with several industrial players joining the venture to transfer urban mobility to the air. This has exacerbated the problem of noise pollution, mainly due to the relatively lower altitude of these vehicles and to the proximity of their routes to extremely densely populated areas. In particular, both the aerodynamic and aeroacoustic optimization of the propulsive system and of its interaction with the airframe are key aspects of the design of aerial vehicles for the success or the failure of their mission. The industrial challenge involves finding the best performance in terms of loading, efficiency and weight, and, at the same time, the most silent configuration. For this reason, research has focused on an initial localization of the noise sources and, on further analysis, of the noise generation mechanism, focusing particularly on directivity and scattering. The aim of the present study is to review the noise source mechanisms and the state-of-the-art technologies available in literature for its suppression, focusing especially on the fluid-dynamic aspects of low Reynolds numbers of the propulsive system and on the interaction of the propulsive-system flow with the airframe.

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An Experimental Study on the Aerodynamic and Aeroacoustic Performances of a Bio-Inspired UAV Propeller

Cited by 28 publications

References 14 publications

Measurement techniques for aeroacoustics: from aerodynamic comparisons to aeroacoustic assimilations

Measurement techniques for aeroacoustics: from aerodynamic comparisons to aeroacoustic assimilations

Experimental investigation into the aerodynamic and aeroacoustic performance of bioinspired small-scale propeller planforms

Small-Scale Rotor Aeroacoustics for Drone Propulsion: A Review of Noise Sources and Control Strategies

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