On the Evaluation of Axisymmetric Forebody Shapes for Delaying Laminar-Turbulent Transition. Part 1. Background and Analysis of the Problem.
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1977
- Accession Number
- ADA164135
Entities
People
- Brian E. Bowers
- David W Taylor
- John T. C. Shen
- Mario J. Casarella