PRELIMINARY Investigation of the Counter-Flow Jet Flap.
Abstract
Preliminary experimental studies were conducted to provide design information for a three-dimensional wing model containing a counter-flow jet flap. This high-lift device uses a forward-facing ejector to induce airflow into a blunt, opened trailing edge. That flow, mixed with the ejector primary flow, is directed downward at approximately mid-chord of the wing lower surface, just downstream of a short rigid split flap. The jet flap location at mid-chord is expected to produce small pitching moments about the quarter-chord. Preliminary tests of a two-dimensional airfoil in a smoke tunnel were performed to obtain qualitative aerodynamic performance data and measurements of ejector operating environment. Two-dimensional tests of the jet pump, duct, and turning vanes were conducted to assist in selecting a satisfactory ejector configuration. Results of these tests were used in the design and construction of an untwisted 10-ft span rectangular wing of aspect ratio 8.4 equipped with a counter-flow jet flap. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1970
- Accession Number
- AD0873264
Entities
People
- Martin R. Fink
- Richard C. Stoeffler
Organizations
- United Technologies Corporation