Influence of main and outer wings on aerodynamic characteristics of compound wing-in-ground effect

Dakhrabadi, Mohammad Tavakoli; Seif, Mohammad Saeed

doi:10.1016/j.ast.2016.06.002

Cited by 20 publications

(6 citation statements)

References 12 publications

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“…The transition in going outboard between the two compound wings is marked by the endplate of the WIG wing, which like the LOSSEI, is also a demi-hull for landing, take-off, and surface stability. Such a design of compound wings for a balance of WIG and conventional flight can be explored using a practical model, developed by [48], including aiding with the longitudinal stability by the longitudinal bias of the outer wing towards the tail. Another aspect that needs optimization is the placement of the endplates or demi-hulls, which for the LOSSEI case was as outboard as possible to maximise the spanwise WIG effect.…”

Section: Future Iterationsmentioning

confidence: 99%

Conceptualising a Hybrid Flying and Diving Craft

Joiner

Swidan

2023

JMSE

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This paper introduces the conceptual design of a submersible seaplane that merges the maturity of the wing-in-ground (WIG or ekranoplan) crafts and seaplanes with covert hybrid underwater insertion, travel, and recovery. WIG crafts have a higher lift-to-drag ratio and thus improved endurance, while hybrid crafts have recently become feasible due to advances in materials, electric propulsion, and multi-medium computational fluid dynamics. The reconnaissance design can insert, loiter, and extract from underwater, surfaces if necessary; it can fly in or out of ground effect, keep watch on the sea surface while recharging, and travel underwater. This design minimizes Doppler and infrared signatures to evade the surface wave, backscatter radar systems, and cube satellite arrays typical in contested maritime areas. Five critical enabling technologies are overviewed, showing how they enable a conceptual design. This project was conducted in collaboration with two industrial partners, namely Ron Allum and Thales Australia. The conceptual design has been socialised and confirmed at technical conferences from each core discipline and partly confirmed by a recent Chinese design and testing of a similar hybrid uncrewed aerial vehicle (HUAV). Recommendations are made for improving the conceptual design before proof-of-concept prototype testing. Given the seminal nature of HUAV design and research and some of the unique innovations proposed, the lessons learned from this iteration will likely be significant to other designers and researchers.

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Section: Future Iterationsmentioning

confidence: 99%

Conceptualising a Hybrid Flying and Diving Craft

Joiner

Swidan

2023

JMSE

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“…In this section, a mathematical model is used to estimate the lift, drag and pitching moment coefficient of the compound wing that is presented by Tavakoli Dakhrabadi and Seif. 24 Given the high ability of numerical methods to investigate the aerodynamic of WIG, they proposed the numerical approach to validate the mathematical model of compound WIG. They showed that the mathematical model results have good agreement with the numerical results for calculating the aerodynamic characteristics of the compound WIG.…”

Section: Hydro-aerodynamic Mathematical Modelmentioning

confidence: 99%

“…They showed that the mathematical model results have good agreement with the numerical results for calculating the aerodynamic characteristics of the compound WIG. 24…”

Section: Hydro-aerodynamic Mathematical Modelmentioning

confidence: 99%

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Hydro-aerodynamic mathematical model and multi-objective optimization of wing-in-ground effect craft in take-off

Dakhrabadi

Seif

2017

Proceedings of the Institution of Mechanical Engineers, Part M:

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Hydro-aerodynamic mathematical model and multi-objective optimization of a popular wing-in-ground effect craft are presented in this research using a hydro-aerodynamic practical method and the genetic algorithm. The primary components of the wing-in-ground effect craft configuration include a compound wing, catamaran hull form and a poweraugmented ram platform. The hydro-aerodynamic practical method with low computational time and high accuracy is performed by coupling hydrodynamic and aerodynamic considerations using the potential flow theory in ground effect and the semi-empirical equations proposed for high-speed marine vehicles. The trade-off between hydrodynamic and aerodynamic characteristics makes it difficult to simultaneously satisfy the design requirements of high hydroaerodynamic performance. In this article, three goals-reduced hump resistance, increased compound wing lift-to-drag ratio and reduced takeoff speed-are selected as the objective functions. The longitudinal position of center of gravity, position of outer wing with respect to main wing, power augmented ram platform angle to horizontal and flap angle are also adopted as design variables. Static height stability and the location of the center of gravity with respect to the aerodynamics centers are considered as constraints for the stable flight in ground effect. The optimal solutions of the multiobjective optimization were not unique, rather a set of non-dominated optima, called the Pareto sets, are obtained. As a result of the multi-objective optimization, 25 Pareto individuals are obtained that the naval architects can use in designing wing-in-ground crafts.

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“…Tavakoli Dakhrabadi and Seif 18 examined the stability for static height and aerodynamic features of compound WIG effect using a mathematical model having a short computational time. The greater role played by main wing in production of aerodynamic coefficients was observed under severe ground effect while its function decreased as distance from ground increased.…”

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confidence: 99%

Experimental and computational investigations of aerodynamic characteristics of a finite rectangular wing-in-ground effect

Shirsath

Mukherjee

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Wind tunnel experiments are carried out on a 3D wing-in-ground effect at pre- and post-stall angles of attack at a relatively low Reynolds number, Re ≈ 8.8 × 104. The rectangular wing, aspect ratio, AR = 6.4 used in the present work has a symmetric airfoil section, NACA0012 and is studied at different ranges of ground proximity and also compared to a wing of cambered airfoil section, NACA4415 not in ground proximity. Unsteady and time-averaged six-component aerodynamic characteristics, coefficients of Lift, Drag, Side forces, Pitch, Roll, Yaw moments at several angles of attack in the range – 8° < α < 18° are reported. Aerodynamic efficiency and drag polars are studied in lieu of ground proximity at several angles of attack. Effect of ground proximity on the occurrence of stall and [Formula: see text] is studied. Numerical calculations using steady-state CFD are also made for quantitative comparison. The effect of ground proximity on span-wise pressure distribution and induced velocity in the vicinity of the wing is also discussed in detail.

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Influence of main and outer wings on aerodynamic characteristics of compound wing-in-ground effect

Cited by 20 publications

References 12 publications

Conceptualising a Hybrid Flying and Diving Craft

Conceptualising a Hybrid Flying and Diving Craft

Hydro-aerodynamic mathematical model and multi-objective optimization of wing-in-ground effect craft in take-off

Experimental and computational investigations of aerodynamic characteristics of a finite rectangular wing-in-ground effect

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