Hydrofoil Conceptual Design and Optimization Framework for Amphibious Aircraft

Seth, Arjit; Liem, Rhea Patricia

doi:10.2514/6.2019-3552

Cited by 3 publications

(6 citation statements)

References 11 publications

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“…The maximum point obtained in this initialization procedure is then used to determine the incidence angle's initial value in the water-takeoff distance minimization procedure. A similar profile was obtained from a study on the YS-920 hydrofoil, designed for subcavitating conditions [1]. However, it suffered from lower (L/D) h f ratios and higher water-takeoff distances, indicating profiles designed for subcavitating regimes were not suitable for amphibious aircraft and further emphasized the need for using supercavitating hydrofoils in this particular application.…”

Section: Water-takeoff Distance Minimizationsupporting

confidence: 57%

“…The selection of the airfoil for the wing is the NACA 63(4)-12 profile. A surrogate model for this airfoil using RANS without ground effects has been generated by Seth and Liem [1], which is used here. A quadratic thrust model presented by Gudmundsson [50] is used based on the specifications of a Pratt and Whitney Canada PT6A-34 turboprop engine via the following expression with T as the thrust of the engine as a function of speed u, as shown in Equation (21).…”

Section: Case Study Description and Results-10-seater Amphibious Aircraftmentioning

confidence: 99%

“…Thurston and Vagianos showed that hydrofoils designed for supercavitating regimes far outperformed their subcavitating counterparts in terms of (L/D) ratios as a result of negligible effects of ventilation in supercavitating conditions, and should be primary considerations for amphibious aircraft [3]. A study on the performance of hydrofoils designed for subcavitating and partially cavitating regimes for use in amphibians supports this conclusion [1]. It is thus imperative to use supercavitating hydrofoils in amphibious aircraft applications.…”

Section: Configuration and Profile Selectionmentioning

confidence: 97%

“…The surrogate models for time-averaged C L , C D , and C M of the supercavitating hydrofoil are presented in Figure 11. Note that the profiles shown here significantly differ from ones generated by airfoils, as the cavitation effects are accounted for [1]. The surrogate models are generated using Kriging models via the SMT: Surrogate Modeling Toolbox [52] for the Waid-Lindberg hydrofoil profile using 25 sample points over 0 ≤ α h f ≤ 15 and 2 ≤ u ≤ 45.…”

Section: Grid Generation Convergence Study and Validationmentioning

confidence: 99%

“…Amphibious aircraft have the potential to play an important role in passenger transport as part of general aviation, particularly in short-range flights [1]. Aircraft designed for takeoff and landings solely on runways are limited by the number of airports present in regions.…”

Section: Introductionmentioning

confidence: 99%

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Amphibious Aircraft Developments: Computational Studies of Hydrofoil Design for Improvements in Water-Takeoffs

Seth

Liem

2020

Aerospace

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Amphibious aircraft designers face challenges to improve takeoffs and landings on both water and land, with water-takeoffs being relatively more complex for analyses. Reducing the water-takeoff distance via the use of hydrofoils was a subject of interest in the 1970s, but the computational power to assess their designs was limited. A preliminary computational design framework is developed to assess the performance and effectiveness of hydrofoils for amphibious aircraft applications, focusing on the water-takeoff performance. The design framework includes configuration selections and sizing methods for hydrofoils to fit within constraints from a flying-boat amphibious aircraft conceptual design for general aviation. The position, span, and incidence angle of the hydrofoil are optimized for minimum water-takeoff distance with consideration for the longitudinal stability of the aircraft. The analyses and optimizations are performed using water-takeoff simulations, which incorporate lift and drag forces with cavitation effects on the hydrofoil. Surrogate models are derived based on 2D computational fluid dynamics simulation results to approximate the force coefficients within the design space. The design procedure is evaluated in a case study involving a 10-seater amphibious aircraft, with results indicating that the addition of the hydrofoil achieves the purpose of reducing water-takeoff distance by reducing the hull resistance.

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Section: Water-takeoff Distance Minimizationsupporting

confidence: 57%

Section: Case Study Description and Results-10-seater Amphibious Aircraftmentioning

confidence: 99%

Section: Configuration and Profile Selectionmentioning

confidence: 97%

Section: Grid Generation Convergence Study and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Amphibious Aircraft Developments: Computational Studies of Hydrofoil Design for Improvements in Water-Takeoffs

Seth

Liem

2020

Aerospace

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A Time-Domain Planning Method for Surface Rescue Process of Amphibious Aircraft for Medium/Distant Maritime Rescue

Yin

Xue

et al. 2023

Applied Sciences

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Medium/distant maritime rescue is significantly important in the development of maritime business. For typical medium/distant maritime rescue, the range limitation of helicopters and many difficulties between helicopter and ship cooperation lead to unsatisfactory rescue results. Compared to helicopters and ships, amphibious aircrafts could effectively solve the problems faced by helicopters and ships and meet the medium/distant maritime rescue demands with their long cruise range, high speed, high rescue capability and surface landing capability. Therefore, a time-domain planning method (TPM) based on the k-means* clustering algorithm and the genetic algorithm* is proposed in this study for the surface rescue process (SRP) of amphibious aircrafts in medium/distant maritime rescue. To simulate the SRP of amphibious aircrafts, an agent-based simulation environment of medium/distant maritime rescue was constructed based on the Python platform. Finally, a case study was carried out to verify its effectiveness and applicability. The results show that the TPM exhibits satisfactory rescue results for the SRP of the amphibious aircraft and that less than 1 h of delay time is recommended for the amphibious aircraft to rescue the persons in distress by using TPM.

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Overview of Propulsion Systems for Unmanned Aerial Vehicles

et al. 2022

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Unmanned Aerial Vehicle (UAV) propulsion technology is significantly related to the flight performance of UAVs, which has become one of the most important development directions of aviation. It should be noted that UAVs have three types of propulsion systems, namely the fuel, hybrid fuel-electric, and pure electric, respectively. This paper presents and discusses the classification, working principles, characteristics, and critical technologies of these three types of propulsion systems. It is helpful to establish the development framework of the UAV propulsion system and provide the essential information on electric propulsion UAVs. Additionally, future technologies and development, including the high-power density motors, converters, power supplies, are discussed for the electric propulsion UAVs. In the near future, the electric propulsion system would be widely used in UAVs. The high-power density system would become the development trend of electric UAVs. Thus, this review article provides comprehensive views and multiple comparisons of propulsion systems for UAVs.

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Hydrofoil Conceptual Design and Optimization Framework for Amphibious Aircraft

Cited by 3 publications

References 11 publications

Amphibious Aircraft Developments: Computational Studies of Hydrofoil Design for Improvements in Water-Takeoffs

Amphibious Aircraft Developments: Computational Studies of Hydrofoil Design for Improvements in Water-Takeoffs

A Time-Domain Planning Method for Surface Rescue Process of Amphibious Aircraft for Medium/Distant Maritime Rescue

Overview of Propulsion Systems for Unmanned Aerial Vehicles

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