An Experimental Analysis on Propeller Performance in a Climate-controlled Facility

Scanavino, Matteo; Vilardi, Andrea; Guglieri, Giorgio

doi:10.1007/s10846-019-01132-9

Cited by 19 publications

(6 citation statements)

References 7 publications

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“…Interesting experimental activities aimed at investigating the influence of pressure and temperature at low Reynolds number on the UAV performance, in a climate controlled facility, can be found in [95,[97][98][99]. In particular, both the temperature and pressure effects on the propeller thrust [97,99] and the isolated rotor and full UAV performance data under unconventional atmosphere conditions [95] were investigated.…”

Section: Ground Testmentioning

confidence: 99%

Sensors and Measurements for UAV Safety: An Overview

Balestrieri

Daponte

Vito

et al. 2021

Sensors

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Unmanned aerial vehicles’ (UAVs) safety has gained great research interest due to the increase in the number of UAVs in circulation and their applications, which has inevitably also led to an increase in the number of accidents in which these vehicles are involved. The paper presents a classification of UAV safety solutions that can be found in the scientific literature, putting in evidence the fundamental and critical role of sensors and measurements in the field. Proposals from research on each proposed class concerning flight test procedures, in-flight solutions including soft propeller use, fault and damage detection, collision avoidance and safe landing, as well as ground solution including testing and injury and damage quantification measurements are discussed.

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Section: Ground Testmentioning

confidence: 99%

Sensors and Measurements for UAV Safety: An Overview

Balestrieri

Daponte

Vito

et al. 2021

Sensors

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“…В роботі [3] У роботах [8,9] освячені питання щодо аероакустики співвісних гвинтів. Результати роботи [8] показують механізм аеродинамічного взаємодії аеродинамічного сліду за першим і другим рядом гвинта.…”

Section: вступunclassified

Вплив Зазору Між Рядами Співвісного Повітряного Гвинта На Тягу

Усенко¹,

Дорошенко²,

Хижняк³

2020

aktt

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The thrust of a turboprop engine depends on many factors, one of which is hydraulic loss when flowing around the propeller blades. When using coaxial propellers, this factor plays an even greater role, since in this case the losses associated with the swirl sheet behind the first propeller were added. The aim of the work is to assess the influence of the axial clearance between the rows of the coaxial propeller on the thrust. The object of the study is a coaxial propeller. The axial clearance between the rows of the propeller ranged from 650 mm to 950 mm. Geometrically, the calculation model was a cylinder with a radius of 75 m and a height of 150 m. A coaxial propeller was located in the center of the cylinder. The investigated computational model is divided into four subregions: the external environment, the input guide vane, the first row of the propeller, the second row of the propeller. Separation of the calculation model into those listed below for the region allows us to evaluate the effect of the engine air intake on the propeller parameters and to ensure the correct modeling of flow around two rows of the propeller. In the first step of the study, a comparison was made of the results of numerical simulation with the results of an approved mathematical model for a version of a propeller with an axial clearance of 650 mm. The calculations were carried out with three models of turbulent viscosity: k-ω, SST, SST Gamma Theta Transitional. Based on the comparison, the SST turbulent viscosity model was selected for further research. The second research step included flow modeling for a modified coaxial propeller with an axial clearance between the propeller rows of 950 mm. According to the results of the study, it was found that the magnitude of the axial clearance between the rows of coaxial propeller affects the thrust. It is shown that when the clearance between the rows of the propeller increases from 650 mm to 950 mm, the thrust of the propeller increases by 17 %. This can be explained by a decrease in the level of unevenness and hydraulic losses behind the second row of the propeller. In the future, the obtained results of a numerical experiment require agreement with a field experiment.

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“…In the past, Reynold effects on isolated propellers were investigated by Brandt and Selig by means of wind tunnel tests at different flow speed. However, except for our previous work [31] on propeller tests in a climate controlled facility, no other experimental activities investigate temperature and pressure influence at low Reynolds number for propeller and multirotor UAS performance. While in our previous study we highlighted the effect of temperature and pressure on propeller thrust, the primary objective of this article is to integrate the research including additional details on the isolated rotor performance and full vehicle data under unconventional atmospheres.…”

Section: Introductionmentioning

confidence: 99%

Unmanned Aircraft Systems Performance in a Climate-Controlled Laboratory

Scanavino

Avi

Vilardi

et al. 2021

J Intell Robot Syst

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Despite many research studies focus on strategies to improve autopilot capabilities and bring artificial intelligence onboard Unmanned Aircraft Systems (UAS), there are still few experimental activities related to these vehicle performance under unconventional weather conditions. Air temperature and altitudes directly affect thrust and power coefficients of small scale propeller for UAS applications. Reynolds numbers are usually within the range 10,000 to 100,000 and important aerodynamic effects, such as the laminar separation bubbles, occur with a negative impact on propulsion performance. The development of autonomous UAS platforms to reduce pilot work-load and allow Beyond Visual Line of Sight (BVLOS) operations requires experimental data to validate capabilities of these innovative vehicles. High quality data are needed for a deep understanding of limitations and opportunities of UAS under unconventional flight conditions. The primary objective of this article is to present the characterization of a propeller and a quadrotor capabilities in a pressure-climate-controlled chamber. Mechanical and electrical data are measured with a dedicated test setup over a wide range of temperatures and altitudes. Test results are presented in terms of thrust and power coefficient trends. The experimental data shows low Reynolds numbers are responsible for degraded thrust performance. Moreover, details on brushless motor capabilities are also discussed considering different temperature and pressure conditions. The experimental data collected in the test campaign will be leveraged to improve UAS design, propulsion system modelling as well as to provide guidelines for safe UAS operations in extreme environments.

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An Experimental Analysis on Propeller Performance in a Climate-controlled Facility

Cited by 19 publications

References 7 publications

Sensors and Measurements for UAV Safety: An Overview

Sensors and Measurements for UAV Safety: An Overview

Вплив Зазору Між Рядами Співвісного Повітряного Гвинта На Тягу

Unmanned Aircraft Systems Performance in a Climate-Controlled Laboratory

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