On the Evaluation of Axisymmetric Forebody Shapes for Delaying Laminar-Turbulent Transition. Part 1. Background and Analysis of the Problem.
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP ACOUSTICS DEPT
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This investigation examines the inherent potential flows and laminar boundary layer characteristics on the nose surface of axisymmetric bodies that can postpone the natural transition process from a laminar to turbulent flow. Based on this analysis, an effort is made to find a correlation between the geometrical features of a given body shape, and the ability of that shape to delay transition. Ellipsoidal forebodies for which stability computations have been performed, are presented to show those attributes of a good nose design. These examples give some direction to future work in obtaining the optimal design. Prior to the discussion of the effects of nose shape on transition, a brief review of the method commonly used for predicting transition is presented followed by a discussion of the distinctive features of axisymmetric flows as compared to the widely discussed two-dimensional flows. This is essential background material and forms the basis of most of the arguments presented on the choice of a good bow shape design. Keywords Boundary layer transition Axisymmetric bodies Optimal shape Laminar flow.
- Numerical Mathematics
- Fluid Mechanics