Fundamental Studies of Turbulent Boundary Layers with Injection or Suction through Porous Wall : 3rd Report, Investigations on the Separation of Turbulent Boundary Layers in Strong Adverse Pressure Gradients with Injection through Porous Flat Plate

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概要

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• The purpose of this paper is to arrange the analytical method presented in 2nd paper so as to be applicable to "the neighbouring part to the separation point", which is defined to be an extended area of a completely turbulent boundary layer to the separation point, from the experimental results on cases with various strong adverse pressure gradients and the injection. Then, cases with stronger adverse pressure gradients and various inlet main flow velocities have been experimented. From these experiments the following results are obtained for the neighbouring part to the separation point; (1) The character of One-Parameter Family is not applicable to the velocity distribution. (2) The shearing stress at the wall decreases suddenly to zero at the separation point, but the friction work does not show any apparent change. (3) The general fundamental equations of motion, momentum and energy are satisfied except in the nearest part to the separation point. Based on the above experimental results, the analytical method has been derived for determining the momentum thickness θ and the shape factor H(=δ^*/θ.δ^*: displacement thickness) in the neighbouring part to the separation point. It is confirmed that the analytical and the experimental values show very good agreement with each other. Further, a new method of detecting the separation point is presented.

• 一般社団法人日本機械学会の論文

著者

• Maeda Toshiyuki

  Faculty Of Engineering Tokyo Metropolitan University

• MAEDA Toshiyuki

  Faculty of Engineering, Tokyo Metropolitan University

関連論文

• Fundamental Studies on the Control of Turbulent Boundary Layers : 1st Report, Theoretical and Experimental Analyses of Velocity Profiles and Parameters with and without Adverse Pressure Gradient, with Uniform Suction through a Porous Flat Plate
• Study of Compressible High Speed Gas Flow in Piping System : 3rd Report, Flow Characteristics in Junctions
• A Simplified Method of the Cascade Test
• Fundamental Studies of Turbulent Boundary Layers with Injection or Suction through Porous Walls : 2nd Report, Theoretical and Experimental Analysis of Turbulent Boundary Layers with Injection and Adverse Pressure Gradients
• Fundamental Studies of Turbulent Boundary Layers with Injection or Suction through Porous Wall : 4th Report, Application of Fundamental Theoretical Analysis to Cascaded Blades with Injection or Suction and Cascade Tests
• Fundamental Studies of Turbulent Boundary Layers with Injection or Suction through Porous Wall : 3rd Report, Investigations on the Separation of Turbulent Boundary Layers in Strong Adverse Pressure Gradients with Injection through Porous Flat Plate

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