Improved Rotor Cooling for PM Machines

Not Available A combined model and experiment based method is proposed for the design of cavity flameholders in a supersonic environment. Recessed cavities play an important role in many scramjet propulsion systems as a low drag flameholder. These flowfields are remarkably complicated with internal and external regions that are coupled via self-sustained shear layer oscillations. A CFD design tool based on large eddy simulations (LES) will be developed for the design and analysis of the cavity flameholder. The development of the design tool and the flameholder will be carried out in parallel with dynamic pressure measurements spanning the length of the cavity using an optically interrogated MEMS based pressure sensor array. The proposed concept will lead to an LES based cavity design tool and rugged surface pressure mapping instrumentation with spatial and temporal resolution that is currently unavailable. The proposed LES/MEMS model for cavity flameholder design will allow a detailed analysis of highly turbulent unsteady flows that cannot be properly captured with traditional RANS methodologies, empirical models, or standard measurement techniques. The proposed model and instrumentation will be of great interest to scientists and engineers involved with the analysis and design of advanced propulsion components which are dominated by large scale turbulence and unsteady effects.