Double-Ducted Fan as an Effective Lip Separation Control Concept for Vertical-Takeoff-and-Landing Vehicles

Aktürk, Ali

doi:10.2514/1.c036386

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…Deng et al [24] conducted experiments on a coaxial ducted fan UAV under forward flight conditions and successfully defined an initial operation region of the UAV. Akturk and Camci [25] identified the aerodynamic modifications due to fan inlet flow distortion in edgewise flight and then proposed a method using a secondary duct to control the inlet lip separation during edgewise flight.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics of a Ducted Fan Hovering and Transition in Ground Effect

2022

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Ducted fans installed on vertical takeoff and landing vehicles experience significant ground effect during takeoff and landing. The aerodynamic characteristics of a ducted fan hovering and transitioning in the ground effect are studied using numerical simulations in this paper. The flowfields are obtained by solving Reynolds Averaged Navier–Stokes equations with the Multiple Reference Frame approach. When a ducted fan hovers in the ground effect, the blade thrust increases due to the combined effect of the increase in the effective angle of attack of the blade and the increase in ambient pressure; the duct thrust decreases due to the combined effect of the decrease in the effective angle of attack of the duct and the increase in ambient pressure. Stall occurs at a certain advance ratio and angle of attack when transitioning in the ground effect. The ground effect delays the occurrence of stall at some advance ratios. The ground effect is hardly detectable at angles of attack less than 30° even if the height drops to 0.5 times the duct exit diameter. At this height and high angles of attack, the different positions and influence regions of the ground vortex at different advance ratios contribute to the different variation trends in the ducted fan performance.

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Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics of a Ducted Fan Hovering and Transition in Ground Effect

2022

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“…However, they could not capture the pressure fluctuations on the inner surface of the duct. Akturk [2,3] conducted experimental and numerical investigations to explore ducted fans' design and tip clearance. Xu [4] compared the aerodynamic characteristics of ducted and isolated propellers.…”

Section: Introductionmentioning

confidence: 99%

Integrated design optimization of ducted lift fan for lift enhancement and noise reduction based on nested NFFD control body

Zhang,

Sun,

Cai

et al. 2024

J. Phys.: Conf. Ser.

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In order to enhance the aerodynamic performance and reduce the aerodynamic noise of the coaxial dual-rotor ducted fan, this paper proposes a stepwise optimization strategy based on nested NFFD (Nurbs-Based Free-Form Deformations) control body parameterization. This strategy takes into account the optimization of aerodynamic performance, which involves significant deformations, and noise reduction, which requires fine deformations. By doing so, it effectively addresses the issue of drastically increased computational complexity and time consumption associated with conventional multi-objective optimization methods. By designing the aerodynamic shape of the blades, along with aerodynamic performance parameter calculation and aerodynamic noise calculation modules, it is possible to achieve lift enhancement and noise reduction for the ducted fan. The numerical simulation results demonstrate that the flow field over the optimized blade surface is improved significantly. The lift has increased from 3.45N to 3.54N, resulting in a 2.6% enhancement. Additionally, the noise level has decreased from 72.33dB to 69.52dB, achieving a noise reduction of 2.81dB.

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“…For this, computational Fluid Dynamics (CFD) combined with shroud design and rotor/motor selection are considered crucial. The principal objectives of the motor selection criteria endeavor encompass the enhancement of hover endurance, payload capacity, and overall robustness [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Enhancing VTOL Performance: Shrouded Rotor BLDC Motor Model and Validation

Dayhoum,

Etewa,

Ramirez-Serrano

et al. 2024

J. Phys.: Conf. Ser.

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One prominent area of current research interest, driven by a multitude of factors and considerations, centers around drone technology. A primary challenge currently faced in the realm of small-scale Unmanned Aerial Vehicles (UAVs) is the increasing demand for increased power coupled with the constraint of limited flight duration provided by available battery technology. These vehicles fall into two overarching categories based on the presence or absence of shrouding around their rotor(s). Shrouded rotors play a pivotal role in augmenting aerodynamic performance by enhancing thrust while mitigating blade-tip vortex losses and numerous other aspects that are not presented in open rotors. Although such characteristics contribute to an expanded effective rotor diameter and optimized airflow within the shroud. There are numerous aspects related to power, shroud and rotor characterization, etc. that need to be understood before shrouded rotors are commonly used. This paper presents the implementation of an effective mathematical model for Brushless Direct Current (BLDC) motors, specifically tailored for application in conjunction with shrouded rotors aimed at enhancing thrust and reducing power consumption. The proposed model serves to predict the performance characteristics of the utilized motor within the context of the specified shrouded rotor combination. In order to identify the effects of the induced load torque on the rotor’s dynamic response, a methodical analysis is conducted on the numerical simulation of the proposed model. The results are experimentally verified for hover flying in a case study of a scalable and highly maneuverable vertical takeoff and landing aircraft developed for operations in highly confined spaces. The adoption of this modeling technique is anticipated to significantly streamline the shrouded rotor combination design and selection process, particularly in the selection of an appropriate motor.

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Double-Ducted Fan as an Effective Lip Separation Control Concept for Vertical-Takeoff-and-Landing Vehicles

Cited by 9 publications

References 12 publications

Aerodynamic Characteristics of a Ducted Fan Hovering and Transition in Ground Effect

Aerodynamic Characteristics of a Ducted Fan Hovering and Transition in Ground Effect

Integrated design optimization of ducted lift fan for lift enhancement and noise reduction based on nested NFFD control body

Enhancing VTOL Performance: Shrouded Rotor BLDC Motor Model and Validation

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