Co-Flow Jet Airfoil Trade Study Part I: Energy Consumption and Aerodynamic Efficiency

Lefebvre, Alexis; Zha, Gecheng

doi:10.2514/6.2014-2682

Cited by 16 publications

(16 citation statements)

References 14 publications

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“…The lift is greatly enhanced by the use of CFJ even though the improvement is not as significant as with the thick NACA 23121 CFJ airfoil [11] because the lower thickness reduces the circulation. The maximum lift coefficient reaches C L max = 2.40 for C µ = 0.16, a significant improvement compared with the baseline airfoil that reaches a maximum C L max of 1.50.…”

Section: Cfj Airfoil With Thrust Generationmentioning

confidence: 96%

“…The low drag NACA 21112 CFJ thin airfoil studied in [11] is simulated with varying AoA, C µ and injection sizes and the resulting aerodynamic performance and efficiency is quantified. The airfoils injection and suction slots are located at 4% and 40% chord respectively.…”

Section: Cfj Airfoil With Thrust Generationmentioning

confidence: 99%

“…5. The NACA 23112 CFJ airfoil is chosen with an injection location moved upstream to 4% chord location because this thin airfoil features a low drag and a high efficiency in the thickness trade study form [11].…”

Section: Cfj Airfoil With Thrust Generationmentioning

confidence: 99%

“…The Part I of the parametric study [11] focused on the energy consumption and corrected aerodynamic efficiency via a trade study performed for a NACA 23121 CFJ airfoil on the injection and suction location and size, AoA, C µ , airfoil thickness and Reynolds number. The distinguishing feature of CFJ airfoil from conventional non-controlled airfoil is that CFJ airfoil gain the efficiency benefit at high C L range, where the conventional non-controlled airfoil can not reach due to stall.…”

Section: Introductionmentioning

confidence: 99%

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Co-Flow Jet Airfoil Trade Study Part II: Moment and Drag

Lefebvre

Zha

2014

32nd AIAA Applied Aerodynamics Conference

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This paper is Part II of a parametric study on CFJ airfoils. In the first part of the paper, the CFJ airfoil suction surface shape is modified to reduce or overcome the nose-down moment. In the second part of the paper, the injection and suction sizes and C µ are varied to increase the CFJ airfoil thrust generation. For both parts, the resulting effects on the lift, drag, moment and energy consumption is analyzed. The two dimensional flow is simulated using steady and unsteady Reynolds Average Navier-Stokes (RANS). A 5th order WENO scheme for the inviscid flux, a 4th order central differencing model for the viscous terms and the one equation Spalart-Allmaras model for the turbulence are used to resolve the flow. The Mach number is 0.15 and Reynolds number is 6.4 × 10 6. The nose-down moment of the CFJ airfoils was successfully reduced with the use of reflex camber while negative drag was achieved with a thinner airfoil, and a reduced injection size. Increasing C µ further reduces the drag, but at the cost of a much higher energy consumption and reduced corrected aerodynamic efficiency. The minimum drag achieved is C D = −0.033 and the highest moment achieved is C M = 0.031.

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Section: Cfj Airfoil With Thrust Generationmentioning

confidence: 96%

Section: Cfj Airfoil With Thrust Generationmentioning

confidence: 99%

Section: Cfj Airfoil With Thrust Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Co-Flow Jet Airfoil Trade Study Part II: Moment and Drag

Lefebvre

Zha

2014

32nd AIAA Applied Aerodynamics Conference

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“…The amount of energy expenditure from the larger slot jet was 3.9 times that of the smaller slot jet which would directly correlate to fuel consumption. American Insitute of Aeronautics and Astromautics Conceptual research has been conducted looking into creating "engineless" Co-Flow Jets and applying this technology to UAVs [30][31][32][33][34]. Figure 1 displays a SOILDWORKS 3D CAD Design Software [35]the rendering of the completed experimental setup for one of the configurations.…”

Section: Slot Jetmentioning

confidence: 99%

Performance Characteristics of Fluidic-Based Thrust Augmentation Using a Slot Jet for Unmanned Aerial Vehicle Propulsion

Wiedow¹,

Ahmed²

2015

51st AIAA/SAE/ASEE Joint Propulsion Conference

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Currently most small vertical takeoff and landing Unmanned Aerial Vehicles (UAV's) use a quadcopter design by utilizing four exposed blades rotating at high RPMs around a central array of components. The research performed in this thesis is focused on understanding the underlying fluid dynamics of a slot jet through the use of flow entrainment for thrust augmentation with the application to be integrated into a novel UAV system with no external moving parts. Current publicly available quadcopter rotor design type aircraft were used as a basis for the design target weight and power to estimate the amount of thrust needed to provide lift. The inclusion of the slot jet causes flow entrainment, thereby creating a turbulent jet downstream. The entrainment effects were studied to define how the flow field interacts within the airfoils. The airfoils were constructed utilizing 3-D printing and placed in multiple configurations varying spacing and angle of attack while laboratory shop air was used to control the slot jet exit velocity. In order to determine the effects of this turbulent flow on thrust, a large experimental envelope was created and tested with a Pitot probe experiment. The velocity profiles were recorded and thrust values were calculated. The experimental envelope was narrowed for the most prominent configurations and Particle Image Velocimetry (PIV) with a high speed laser camera setup was used to capture the flow upstream, midstream, and downstream along the airfoils cord length to examine the turbulent mixing and thrust characteristics within the flow field. The effects of slot jet velocity, confinement spacing, and aerodynamic effects were each singularly inspected for the effects on the flow field and thrust characteristics. The results illustrate that higher slot jet velocity along with inward angle and small confinement produce the greatest thrust although efficiency is maximized with a larger spacing. The thrust values produced indicate the feasibility of producing enough force to lift a UAV vertically off the ground.

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Studies on the enhancement of aerodynamic performance in aerofoils using co-flow jet: a comprehensive review

Balaji

Wessley²

2022

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Co-Flow Jet Airfoil Trade Study Part I: Energy Consumption and Aerodynamic Efficiency

Cited by 16 publications

References 14 publications

Co-Flow Jet Airfoil Trade Study Part II: Moment and Drag

Co-Flow Jet Airfoil Trade Study Part II: Moment and Drag

Performance Characteristics of Fluidic-Based Thrust Augmentation Using a Slot Jet for Unmanned Aerial Vehicle Propulsion

Studies on the enhancement of aerodynamic performance in aerofoils using co-flow jet: a comprehensive review

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