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Current Research of Dr. Eric Jumper

Dr. Jumper conducts his research in the Aero-Optics Laboratory and employs the wind tunnels at the Hessert Laboratory for Aerospace Research.

Unsteady Forcing and Response in Turbomachines

At present, we are engaged in experimental and theoretical investigations of unsteady velocity disturbances and the accompanying unsteady pressure response in compressible cascade and in an actual running turbofan engine. The cascade studies are being conducted in the Hessert Laboratory for Aerospace Research at Notre Dame and the engine studies are being conducted at the United States Air Force Academy in their Jet Engine Test Cells. These investigations have identified new pressure response phenomena not previously accounted for in the turbomachinery, forced-response predictions. Further, the studies have demonstrated the importance of including acoustically-propagating potential disturbances in any response predictions. The most important response mechanism is associated with upstream-propagating potential disturbances.

Aero-Optics

When an otherwise planer electromagnetic wave propagates through a turbulent media in which density gradients exist, the wave emerges with a distorted wave front. The study and analysis of this phenomena is referred to as "aero-optics." Although the optical analysis of the distortion of a wave front emerging from a specified density pattern is well in hand, the measurement of instantaneous realizations of such a field in real flows is still a frontier area. The difficulty of the problem is increased by the fact that sufficient realizations must be measured to understand the spatial and temporal character of the distortion as well as the proper statistical representation of the phase front behavior. The object of this research is to devise methods for obtaining the relevant fluid-mechanic (aero) and optical data simultaneously.

Aircraft Wake Dynamics

When an aircraft wing produces lift it is accompanied by the production of a trailing, multiple-vortex wake. These wakes are known to be hazardous to following aircraft and have been credited with numerous fatal incidents. The object of our efforts in the study of these wakes is to be able to compute the dynamics of the rollup and subsequent character of the trailing wakes and to explore the response of the near-field dynamics to adjustments in wing loading. These computational predictions are accompanied by wind-tunnel investigations. In the near term, we are looking at methods of producing wakes which are self destroying so that the wakes cease to present a hazard to following aircraft.