Application of sailplane and low-drag underwater vehicle technology to the long-endurance drone problem

Carmichael, Bruce

doi:10.2514/6.1974-1036

Cited by 4 publications

(1 citation statement)

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“…Carmechael Method. In 1966, Carmechael could reduce drag through profile change [5]. Using constant volume and front surface, Carmechael could avoid separation and used NASA 66-Airfoil Series for the initial profiles.…”

Section: Indirect Methods Of Potential Flowmentioning

confidence: 99%

Survey on the Indirect Methods of Potential Flow Used for the Optimization of Airships Profile

Hassanzadeh

Shariatmadari

Chegeni

et al. 2014

AMM

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The present study aims to investigate the optimized profile of the body through minimizing the Drag coefficient in certain Reynolds regime. For this purpose, effective aerodynamic computations are required to find the Drag coefficient. Then, the computations should be coupled thorough an optimization process to obtain the optimized profile. The aerodynamic computations include calculating the surrounding potential flow field of an object, calculating the laminar and turbulent boundary layer close to the object, and calculating the Drag coefficient of the object’s body surface. To optimize the profile, indirect methods are used to calculate the potential flow since the object profile is initially amorphous. In addition to the indirect methods, the present study has also used axial singularity method which is more precise and efficient compared to other methods. In this method, the body profile is not optimized directly. Instead, a sink-and-source singularity distribution is used on the axis to model the body profile and calculate the relevant viscose flow field.

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Section: Indirect Methods Of Potential Flowmentioning

confidence: 99%