Drag Reduction of High Altitude Airships by Active Boundary Layer Control : Cusp Effect

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概要

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• The aerodynamic characteristics of station-keeping airships at high Reynolds numbers were examined. The boundary layer flow developed on the hull surface was sucked in by an axial flow fan through a slot located at the rear part of the airship and the sucked-in gas was blown out as a jet. Two models, one with and one without a cusp attached to the inlet of the suction slot, were designed to validate the effects of the cusp. The flow field near the inlet, in particular the pressure on the hull surface, was measured by varying the suction flow rate. We obtained the form drag data by integrating the pressure distribution in a wide range of Reynolds numbers and of suction flow rates. Taking into account the jet thrust and the calculated friction drag, we determined the total drag and evaluated the role of the cusp. It has been found that the effects of the cusp are significant and responsible for reducing the drag.

• 一般社団法人日本機械学会の論文
• 1999-05-15

著者

• Onda Masahiko

  Mechanical Engineering Laboratory Aist Miti

• MATSUUCHI Kazuo

  Institute of Engineering Mechanics, University of Tsukuba

• YAMAMURA Norihiro

  Nissan Motor Company Ltd.

• YAMAZAKI Shinobu

  Mechanical Engineering Laboratory, AIST, MITI

• SASAKI Akira

  Master's Program in Science and Engineering, University of Tsukuba

• Matsuuchi Kazuo

  Institute Of Engineering Mechanics And Systems University Of Tsukuba

• Yamazaki Shinobu

  Mechanical Engineering Laboratory Aist Miti

• Sasaki Akira

  Master's Program In Science And Engineering University Of Tsukuba

関連論文

• Study of the Universal Strouhal Number over the Wide Reynolds Number Flow Range : Effect of Surface Roughness
• Drag Reduction of High Altitude Airships by Active Boundary Layer Control : Cusp Effect
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• Aerodynamics Design and Genetic Algorithms for Optimization of Airship Bodies

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