Theoretical Aspects of Dromedaryfoil.
Abstract
A new airfoil design (called a dromedaryfoil) has been developed using a single hump on a modified supercritical airfoil for limiting the center of pressure excursion and maximizing the drag divergence Mach number. Derivation of the hump is based on isentropic compression in the fore part and incipient separation in the rear. The former leads to a weakened shock wave and the latter to high pressure recovery after the shock. The shock will theoretically locate at the peak of the hump to form a fixed pressure pattern under different flight speeds. The shock foot will be inclined at a deflection angle of the hump measured from the normal of the fore hump surface at the peak. Theoretical results indicate considerably shorter center-of-pressure travel for a dromedaryfoil than for a supercritical airfoil with equal wave drag. However, improper humping would be penalized by increased wave drag. At high supercritical flows, the shock strength would be limited by (M sub 1 sin beta)max = 1.483. Experimental verification of theoretical predictions is planned. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1977
- Accession Number
- ADA047150
Entities
People
- Tsze C. Tai