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We report noise measurements for perfectly expanded coaxial jets composed of a supersonic primary stream at velocity of 920 m/s and a co ow stream at conditions designed to prevent formation of Mach waves. Both the primary and secondary streams consisted of helium–air mixtures to simulate approximately the conditions of hot  ows. The resulting sound Ž eld(More)
Flow control is attracting an increasing attention of researchers from a wide spectrum of specialties because of its interdisciplinary nature and the associated challenges. One of the main goals of The Collaborative Center of Control Science at The Ohio State University is to bring together researchers from different disciplines to advance the science and(More)
This is a joint thermodynamicand acoustic study of engines for next-generation supersonic aircraft. It explores Ž xed-cycle concepts with potential for quiet takeoff and efŽ cient cruise. The  owpath is simple, withoutmechanical suppressors.The strategy is to takearepresentative state-of-the-artmilitary turbofanengineandincrease its bypass ratio to a(More)
Synthetic VGGVG, a "monomeric" unit of the glycine-rich regions of elastin, has been investigated for its molecular and supramolecular properties. In aqueous solution the pentapeptide showed conformational features strongly concentration-dependent. CD and NMR studies suggested a partial unfolding on increasing the concentration. Electron microscopy, on the(More)
In this paper, we present the latest results of our ongoing research activities in the development of reduced-order models based feedback control of subsonic cavity flows. The model was developed using the proper orthogonal decomposition of particle image velocimetry images in conjunction with the Galerkin projection of the Navier-Stokes equations onto the(More)
A duct silencer with tunable acoustic characteristics is presented in this paper. Dielectric elastomer, a smart material with lightweight, high elastic energy density and large deformation under high direct current/alternating current voltages, was used to fabricate this duct silencer. The acoustic performances and tunable mechanisms of this duct silencer(More)
During the last decade, support vector machines (SVM) have proved to be very successful tools for classification and regression problems. The representational performance of this type of networks is studied on a cavity flow facility developed to investigate the characteristics of aerodynamic flows at various Mach numbers. Several test conditions have been(More)