PV / Regenerative Fuel Cell High Altitude Airship Feasibility Study

Colozza, Anthony J.

doi:10.2514/6.2003-6663

Cited by 27 publications

(23 citation statements)

References 1 publication

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“…In recent years, the high-altitude airships (HAAs) have received widespread attention in the aerospace sciences. The long endurance, low energy consumption and high security make HAAs attractive both in the military and civilian areas (1,2) . The above features rely on a high-efficiency propulsion system.…”

Section: Introductionmentioning

confidence: 99%

Optimisation and analysis of efficiency for contra-rotating propellers for high-altitude airships

et al. 2019

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An improved variational optimization approach is established to optimize and analyse the propulsion efficiency of the high-altitude contra-rotating propellers for high-altitude airships based on the Vortex Lattice Lifting Line Method. The optimum radial circulation distribution, chord and pitch distribution are optimized under the maximum lift-to-drag ratio of aerofoils. To consider the effects of the actual Reynolds number and the Mach number of each aerofoil section, aerodynamics such as lift coefficient, drag coefficient and lift-to-ratio are obtained by interpolating a CFD database, which is established by numerical simulations under different Reynolds number, Mach number and angles-of-attack. The improved method is verified by validation cases on a high-altitude CRP using the three-dimensional steady Reynolds-averaged Navier-Stokes solver and moving reference frames technique. The optimization results of thrust, torque and efficiency for both the individual front/rear propeller and CRP are shown to agree reasonably well with the CFD results. Using the improved approach, the influence of blade numbers, diameter, rotation speeds, axial distance and torque ratio on the optimum efficiency of CRPs is illustrated in detail by conducting parametric studies.

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Section: Introductionmentioning

confidence: 99%

Optimisation and analysis of efficiency for contra-rotating propellers for high-altitude airships

et al. 2019

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“…In recent years, the interest in stratospheric aircrafts has been increased considerably. Their long endurance, low energy consumption and high security make stratospheric aircrafts attractive for both military and civilian applications (1,2) . Propellers are widely used on aircrafts as a source of thrust (3,4) .…”

Section: Introductionmentioning

confidence: 99%

The efficiency analysis of high-altitude propeller based on vortex lattice lifting line theory

et al. 2016

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In this paper, we proposed a simple approach to analyse the efficiency and propulsive characteristics of the high-altitude propeller in accordance to the Vortex Lattice Lifting line Method (VLM) theory, which is commonly used in preliminary design and parametric studies of propeller propulsion. The Computational Fluid Dynamics (CFD) method was used to obtain aerofoil aerodynamic data. The optimal pitch angle and propeller blade chord length (along the radial direction) can be calculated using the information from the database. The propeller wake model sees helical slipstreams applied to both lightly and moderately loaded propellers. The proposed method is capable of identifying the optimal efficiency through varying the number of propeller blades, radius and the rotational speed. The relationship between the optimal efficiency and design parameters is then established. This method was verified using CFD calculations.

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“…Many studies have been carried out previously to survey the feasibility of stratospheric solar-powered airships. For any type of long endurance vehicle, Colozza and colleagues [4][5][6] expatiated that technologies such as thin film solar arrays, fuel cells, electrolyzers and power management were the key elements in the feasibility of achieving long duration high altitude flight. A number of factors such as the operational environment and efficiencies of the power system components which can influence the energy balance of a stratospheric solar-powered airship were listed by Colozza.…”

Section: Introductionmentioning

confidence: 99%

Optimum area of solar array for stratospheric solar-powered airship

Sun

2016

Proceedings of the Institution of Mechanical Engineers, Part G:

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An optimization model of the optimum area of solar array for a stratospheric solar-powered airship is developed. The objective of the optimization is to reduce the mass of the solar array on an airship by keeping the equilibrium between output power and weight of solar array as a constraint. Based on several parameters of the typical existing airships, the optimization works are carried out to verify the effectiveness of the optimization model. Furthermore, the effects of the wind velocity, airship’s latitude and working date on the optimum area are analyzed in detail. The results of this study demonstrate that the optimization model is a good tool for the preliminary design of solar array on an airship. It can also be found that these influence factors have significant influences on the optimum area, and these factors should be considered together to obtain an optimum and balanced design due to the strong dependence on each other.

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PV / Regenerative Fuel Cell High Altitude Airship Feasibility Study

Cited by 27 publications

References 1 publication

Optimisation and analysis of efficiency for contra-rotating propellers for high-altitude airships

Optimisation and analysis of efficiency for contra-rotating propellers for high-altitude airships

The efficiency analysis of high-altitude propeller based on vortex lattice lifting line theory

Optimum area of solar array for stratospheric solar-powered airship

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