Wing Theory

Houghton, E.L.; Carpenter, Peter W.; Collicott, Steven H.; Valentine, Daniel T.

doi:10.1016/b978-0-08-100194-3.00007-9

Cited by 9 publications

(12 citation statements)

References 6 publications

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“…Each source or sink has specific strength, K and vortex strength denoted by circulation, Г . Simple 2 D uniform lifting flows (Haughton and Carpenter, 2011; Jain et al , 2020; Nilavarasan et al , 2018) can be described using the streamline and velocity potential functions as equation (1) and equation (2): …”

Section: Methodsmentioning

confidence: 99%

“…Panel methods are suitable for potential flows which involve the superposition of source or a doublet in uniform distributed flow and fail to predict accurate values of pressure and velocity fields for complex geometries. Basic panel methods were developed by Hess and Smith at Douglas aircraft for aircraft industry (Haughton and Carpenter, 2011; Som and Biswas, 2009; Hess, 1979). Procedure consists of distribution of source with finite strengths in fluid which moves radially outward in field at uniform rate while for a sink fluid moves radially inwards at same uniform rate, m 2 /s.…”

Section: Methodsmentioning

confidence: 99%

“…The thickness and mean line distributions for 4 digit symmetric and cambered airfoils are expressed in terms of the thickness to chord ratio. The comprehensive list of geometries for NACA 4 digit airfoils are given in Abbott and Doenhoff ((1990), Haughton and Carpenter (2011) and Clancy (2010)…”

Section: Main Sectionmentioning

confidence: 99%

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Aerodynamic flow modelling of NACA 0010 using 2D panel and Jukouwski methods

Bhargava¹,

Maddula²,

Neigapula

et al. 2022

AEAT

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Purpose This paper aims to model the aerodynamic flow characteristics of NACA0010 for various angle of attacks including stall for incompressible flows using panel methods. This paper also aims to quantify the surface pressure distribution on streamlined bodies and validate the results with analytical Jukouwski method and inverse panel methods that can predict the aerodynamic flow behaviour using the geometric iteration approach. Design/methodology/approach The 2 D panel method was implemented in Qblade software v.06 which uses the fundamental panel method which rely on source strengths and influence coefficients to determine the velocity and pressure fields on the surface. The software implements the boundary layer or viscous effects to determine the influence on aerodynamic performance at various angles of attack. Jukouwski method is also evaluated for predicting aerodynamic characteristics and is based on the geometric iteration approach. Then complex aerodynamic flow potentials are determined based on the source strengths which are used to predict the pressure and velocity fields. Findings At low to moderate angles of attack, panel and Jukouwski methods predict similar results for surface pressure coefficients comparable to Hess and Smith inverse method. In comparison to panel method, results from the Jukouwski mapping method predicted the pressure coefficient conservatively for the same free stream conditions. With increase in Reynolds number, lift coefficient and aerodynamic performance improved significantly for un-tripped aerofoil when stall angle is approached when compared to tripped aerofoil. Practical implications This study demonstrated that panel methods have higher efficacy in terms of computational time or resources and thus can provide benefits to many real-world aircraft or aerospace design applications. Originality/value Even though panel and Jukouwski methods have been studied extensively in the past, this paper demonstrates the efficacy of both methods for modelling aerodynamic flows that range between moderate to high Reynolds number which are critical for many aircraft applications. Both methods have been validated with analytical and inverse design methods which are able to predict aerodynamic flow characteristics for simple bluff bodies, streamlined aerofoils as well as bio-inspired corrugated aerofoils.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Aerodynamic flow modelling of NACA 0010 using 2D panel and Jukouwski methods

Bhargava¹,

Maddula²,

Neigapula

et al. 2022

AEAT

View full text Add to dashboard Cite

show abstract

“…(2) Passive control techniques that do not require auxiliary power or a control loop, such as slot [13], multi-element airfoil [14][15][16], leading-edge slat [1,17], Gurney flap [18][19][20], self-activated flaps [21], vortex generator [22][23][24], stall strips [25,26], and other airfoil configurations that can delay or even eliminate dynamic stall.…”

Section: Introductionmentioning

confidence: 99%

“…Handley Page [27] and Lachmann [15,28] initially introduced the slotted and multielement airfoils, but the first thorough and systematic study of these elements was performed by Weick and Shortal [29]. Weick and Shortal examined various combinations of slots and various slot locations to identify the optimal aerodynamic configuration.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Horizontal Axis Wind Turbine: Aerodynamic Performances Improvement Using an Efficient Passive Flow Control System

et al. 2022

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In this paper, we explore the improvement of the aerodynamic characteristics of wind turbine blades under stall conditions using passive flow control with slots. The National Renewable Energy Laboratory (NREL) Phase II rotor, for which detailed simulations and experimental data are available, served as a baseline for assessing the flow control system effects. The position and configuration of the slot used as a flow control system were determined using CFD analysis. The 3D-RANS equations are solved with ANSYS FLUENT using the k-ω SST turbulence closure model. The pressure coefficient for different wind speeds for the baseline configuration is compared to the available experimental data. The comparison shows that CFD results were better for the attached flow. The current work consists of a 3-D CFD modeling of a rotating blade equipped with different flow control systems: single-slot (S-S) and two-slots (T-S). The computation provides a better understanding of the influence of these flow control devices on the performance of wind turbine blades, the control of boundary layer separation, and the rotation effect. These control systems increase the power output by over 60% at high wind speeds with large separated boundary layer regions. For the configuration with the control system, the slot has shown its ability to delay the boundary layer separation. However, the improved aerodynamic performance has been proven for medium and high angles of attack where the flow is generally in the stall condition. The addition of the second slot changed the flow behavior, and an improvement was observed compared to the single slot configuration. The results are helpful for the design and development of a new generation of wind turbine blades.

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Harnessing wind energy on merchant ships: case study Flettner rotors onboard bulk carriers

Seddiek

Ammar

2021

Environ Sci Pollut Res

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Shipping faces challenges of reducing the dependence on fossil fuels to align with the international regulations of ship emissions reduction. The maritime industry is in urgent need of searching about alternative energy sources for ships. This paper highlights the applicability of harnessing wind power for ships. Flettner rotors as a clean propulsion technology for commercial ships are introduced. As a case study, one of the bulk carrier ships operating between Damietta port in Egypt and Dunkirk port in France has been investigated. The results showed the high influence of the interaction between ship course and wind speed and direction on the net output power of Flettner rotors. The average net output power for each rotor will be 384 kW/h. Economically, the results reveal that the use of Flettner rotors will contribute to considerable savings, up to 22.28% of the annual ship’s fuel consumption. The pay-back period of the proposed concept will be 6 years with a considerable value of levelized cost of energy. Environmentally, NO x and CO 2 emissions will be reduced by 270.4 and 9272 ton/year with cost-effectiveness of $1912 and $55.8/ton, respectively, at annual interest rate of 10%.

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Wing Theory

Cited by 9 publications

References 6 publications

Aerodynamic flow modelling of NACA 0010 using 2D panel and Jukouwski methods

Aerodynamic flow modelling of NACA 0010 using 2D panel and Jukouwski methods

Numerical Modeling of Horizontal Axis Wind Turbine: Aerodynamic Performances Improvement Using an Efficient Passive Flow Control System

Harnessing wind energy on merchant ships: case study Flettner rotors onboard bulk carriers

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