A Study of High Speed Gas Flow by the Hydraulic Analogy : 4th Report, An Airfoil

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  • 浅底水流による高速気流の研究 : 第4報, 単独翼
  • センソコミズリュウ ニ ヨル コウソク キリュウ ノ ケンキュウ 4

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Abstract

When the high speed aerodynamic characteristics of the airfoils by the experimental method of the shallow water flow with free surface were investigated, the author showed that the four dimensionless numbers must be equal for the flows around two airfoils in order that the water depths around two geometrically similar airfoils become similar to each other. However, as this four dimensionless numbers are difficult to be equal for the two systems at the same time, the quantitative experimental results necessitate a certain defined magnitude of airfoil and water depth. On the other hand, experimental results of the defined magnitude of airfoil by the water flow of defined depth with free surface are different from the wind tunnel experimental results of the airfoil, because both Reynolds numbers differ from each other considerably. Therefore, comparing with both experimental results, the experimental formula of correction was found. Moreover, the photographs of flow pattern around the airfoils were taken, thus making the manner of flow clear to a certain extent.

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