Basic experimental data has been obtained from a linear cascade of five turbine airfoil sections undergoing torsional oscillation. A high-turning subsonic/transonic cascade was tested and both steady-state and time-variant data were obtained. A quasi-static investigation was conducted to compare static pressure distributions with the pressure distributions from the time-variant investigation. During the time-variant data acquisition, six values of interblade phase angle were investigated at each of four expansion ratios. Unsteady pressures were measured by flush-mounted Kulite pressure transducers on the center airfoil and compared with an oscillating flat-plate cascade analysis.
A unique supersonic inlet flow field unsteady cascade experiment is described wherein the time-dependent pressure distribution within an harmonically oscillating airfoil cascade is quantitatively determined. The torsional frequency of oscillation and the inter-blade phase angle are precisely controlled by means of on-line digital computers. The dynamic data obtained include the chordwise distribution of the unsteady pressure magnitude and its phase lag as referenced to the airfoil motion. Parameters varied include the cascade inlet Mach number, the interblade phase angle, and the reduced frequency. The time-dependent data are correlated with state-of-the-art analytical predictions.
A need exists to modernize undergraduate pilot training procedures and resources to better address the emergence of new fighter/attack bomber and transport aircraft such as the ATF, A-12, B-1, B-2, C-17 and ATT. The current U.S. training resources consist of the T-37/T-38 aircraft for the Air Force and the T-45, which will replace the T-2C and the TA-4J, in the U.S. Navy pilot training program. The T-37 and T-38 aircraft are of the 1950s-1960s vintage and do not have the flying qualities, sustained G and Mach capability, and cockpit technologies consistent with now-emerging fighter/attack aircraft. The disparity in aircraft agility between today’s (and tomorrow’s) front line aircraft and trainers is illustrated in Fig. 1.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.