High speed aerodynamics of upper surface blowing aircraft configurations

Autor:	Larry D. Birckelbaw
Rok vydání:	1992
Předmět:	Lift-to-drag ratio Engineering business.industry Angle of attack Nacelle Aerodynamics Ground effect (aerodynamics) symbols.namesake Mach number Drag symbols business Marine engineering Wind tunnel
Zdroj:	10th Applied Aerodynamics Conference.
DOI:	10.2514/6.1992-2611
Popis:	An experimental investigation of the high speed aerodynamics of Upper Surface Blowing (USB) aircraft configurations has been conducted to accurately define the magnitude and causes of the powered configuration cruise drag. A highly instrumented wind tunnel model of a realistic USB configuration was used which permitted parametric variations in the number and spanwise location of the nacelles and was powered with two turbofan engine simulators. The tests conducted in the Ames 14 Foot Transonic Wind Tunnel examined 10 different configurations at Mach numbers from 0.5 to 0.775, fan nozzle pressure ratios from 1.1 to 2.1 and angles of attack from -4 to 6 degrees. Measured force data is presented which indicates the cruise drag penalty associated with each configuration and surface pressure contour plots are used to illustrate the underlying flowfield physics. It was found that all of the tested configurations suffered from a severe drag penalty which increased with freestream Mach number, power setting and angle of attack and was associated with the presence of strong shocks and regions of separated flow in the wing/nacelle junction regions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6a0420d9ee99756014e53b78116f7e26 https://doi.org/10.2514/6.1992-2611 Zobrazit plný text záznamu