A Procedure for Calculating the Development of Turbulent Boundary Layers Under the Influence of Adverse Pressure Gradients
Abstract
In an attempt to better predict turbulent boundary layer development in aircraft diffusers, a procedure based on the kinetic energy equation and an extended form of the momentum equation has been devised for calculating the development of turbulent boundary layers, in adverse pressure gradients, for that class of flows for which the fluid density at all points and total pressure outside the boundary layer are invariant. In the development of this procedure an effort was made not only to arrive at an analytical form that would allow examination of the significance of the physical quantities involved but also to achieve a high degree of consistency with the more recent results of turbulent- boundary-layer research. Correlations, which are essential to the execution of the method, of several elements of the basic equations in terms of quantities regarded as controlling parameters are presented. These correlations are strictly interim empirical relationships both as to numerical values and as to the variables involved. It is bo be expected that, with the acquisition of more data covering a broader range of conditions, improvements will be made in both the functional nature and the accuracy of the correlations. A comparable and associated refinement of the basic equations is likewise anticipated as more data are obtained.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1951
- Accession Number
- ADA380565
Entities
People
- Jerome Persh
- Kennedy F. Rubert
Organizations
- National Aeronautics and Space Administration