The Effect of Discrete Spanwise Regions of Bleed on Pseudo-Two Dimensional Base Flow at Transonic Speeds,
Abstract
A preliminary experimental study of a new type of pseudo-two-dimensional bluff base consisting of a series of rectangular prismatic protrusions spaced along the span with base bleed into the regions between the protrusions is presented. A base geometry was derived which had less drag at subsonic and transonic speeds than the best reported non-bleed arrangement for bleed mass flow coefficients (based on the mass flux swept by the model frontal area) in the range 0.02 to 0.04. A simple two-dimensional bleed arrangement requires a bleed coefficient greater than 0.08 to achieve the same subsonic base drag.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1983
- Accession Number
- ADA139499
Entities
People
- N. Pollock