Effect of Flow Curvature on Forward Flight Performance of a Micro-Air-Vehicle-Scale Cycloidal-Rotor

Benedict, Moble; Jarugumilli, Tejaswi; Lakshminarayan, Vinod K.; Chopra, Inderjit

doi:10.2514/1.j052065

Cited by 34 publications

(23 citation statements)

References 24 publications

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“…10,11 More recently, the solver has been used to study the physics of small-scale VAWT with dynamic blade pitching. 12 In this work, two additional validation cases are pursued.…”

Section: Validation and Verificationmentioning

confidence: 99%

Flow Physics and Performance of Vertical Axis Wind Turbine Arrays

Duraisamy

Lakshminarayan

2014

32nd AIAA Applied Aerodynamics Conference

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“…10,11 More recently, the solver has been used to study the physics of small-scale VAWT with dynamic blade pitching. 12 In this work, two additional validation cases are pursued.…”

Section: Validation and Verificationmentioning

confidence: 99%

Flow Physics and Performance of Vertical Axis Wind Turbine Arrays

Duraisamy

Lakshminarayan

2014

32nd AIAA Applied Aerodynamics Conference

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“…Unsteady effects arising from the vehicle's flight mechanics and environmental issues such as wind gusts have a significant effect on control stability issues of MAVs (12) . Extensive research has been carried out by Benedict et al (13)(14)(15)(16)(17) to further understand the aerodynamic and performance characteristics of cycloidal rotors applied to MAVs.…”

Section: July 2017mentioning

confidence: 99%

Improving the aerodynamic performance of a cycloidal rotor through active compliant morphing

2017

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Cycloidal rotors are a novel form of propulsion system that can be adapted to various forms of transport such as air and marine vehicles, with a geometrical design differing significantly from the conventional screw propeller. Research on cycloidal rotor design began in the early 1930s and has developed throughout the years to the point where such devices now operate as propulsion systems for various aerospace applications such as micro air vehicles, unmanned air vehicles and compound helicopters. The majority of research conducted on the cycloidal rotor’s aerodynamic performance have not assessed mitigating the dynamic stall effect, which can have a negative impact on the rotor performance when the blades operate in the rotor retreating side. A solution has been proposed to mitigate the dynamic stall effect through employment of active, compliant leading-edge morphing. A review of the current state of the art in this area is presented. A two-dimensional, implicit unsteady numerical analysis was conducted using the commercial computational fluid dynamics software package STAR CCM+, on a two-bladed cycloidal rotor. An overset mesh technique, otherwise known as a chimera mesh, was used to apply complex transient motions to the simulations. Active, compliant leading-edge morphing is applied to an oscillating NACA 0015 aerofoil to attempt to mitigate the dynamic stall whilst maintaining the positive dynamic lift coefficient (Cl) contributions. It was verified that by applying a pulsed input leading-edge rotational morphing schedule, the leading-edge vortex does not fully form and the large flow separation is prevented. Further work in this investigation will focus on coupling the active, leading-edge motion to the cycloidal rotor model with the aim to maximise aerodynamic performance.

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“…In Seong Hwang and Seung Yong Min et al developed a quad-rotor cyclogyro and proved that the cycloidal propeller can provide enough thrust for hovering and forward flight (3)(4)(5)(6) . Benedict and Chopra et al conducted extensive experimental and numerical simulation on the cycloidal propellers for MAVs (7)(8)(9)(10)(11)(12)(13)(14)(15)(16) . Under hovering status, they made experiments with different aerofoil, blade number, rotor solidity, blade pitch angle and aspect ratio (11,13) .…”

Section: Introductionmentioning

confidence: 99%

“…Under hovering status, they made experiments with different aerofoil, blade number, rotor solidity, blade pitch angle and aspect ratio (11,13) . The aero-elastic analysis was performed (9) and the effect of flow curvature at forward flight status was also studied (14) . According to their experiments and analysis, the cycloidal propeller can be more efficient than the conventional screw propeller under hovering status (11) .…”

Section: Introductionmentioning

confidence: 99%

“…According to their experiments and analysis, the cycloidal propeller can be more efficient than the conventional screw propeller under hovering status (11) . The torsion of the blade will cause lower thrust of the cycloidal propeller (9) and the effect of flow curvature significantly influences the performance of the cycloidal propeller under either hovering status or forward flight status (9,13,14) . Based on these research work, they finally found the most efficient cycloidal rotor design with NACA0015 aerofoil and successfully developed a tri-rotor cyclogryo which can fly in any direction (15) .…”

Section: Introductionmentioning

confidence: 99%

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The effect of the aerofoil thickness on the performance of the MAV scale cycloidal rotor

Hu¹,

Zhang

Tan

2015

Aeronaut.j.

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The numerical simulations for cycloidal propellers based on five aerofoils with different thickness are presented in this paper. The CFD simulation is based on sliding mesh and URANS. The results of CFD simulation indicates that all test cases share similar flow pattern. There are leading edge vortex and trailing-edge vortex due to blade dynamic stall. Interaction between the vortices shed from upstream blade and the downstream blade can be observed. There is variation of blade relative inflow velocity due to downwash in the cycloidal rotor cage. These factors result in large fluctuations of the aerodynamics forces on the blade. The comparison of the forces and flow pattern indicates that the thickness and leading edge radius of the aerofoil can significantly influent the flow pattern and hence the performance of the cycloidal propeller.

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Effect of Flow Curvature on Forward Flight Performance of a Micro-Air-Vehicle-Scale Cycloidal-Rotor

Cited by 34 publications

References 24 publications

Flow Physics and Performance of Vertical Axis Wind Turbine Arrays

Flow Physics and Performance of Vertical Axis Wind Turbine Arrays

Improving the aerodynamic performance of a cycloidal rotor through active compliant morphing

The effect of the aerofoil thickness on the performance of the MAV scale cycloidal rotor

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