Copper oxide films have been shown to be a promising electrode material for the direct production of hydrogen
by the photoelectrochemical (PEC) decomposition of water. In this paper, we present our work in developing a
hot-wall tubular CVD reactor for copper oxide film deposition using a solid-source copper precursor and oxygen.
Initial deposition results have shown that the reactor can reliably deposit solid polycrystalline cuprous oxide
films and porous cupric oxide films, both being promising PEC materials. Unusual spatial patters observed in
the film composition prompted the development of a physically based mathematical model of the CVD process.
Initial results of this modeling work and its role in understanding and optimizing the deposition process will be
presented.
A numerical technique capable of simulating blade-scale compression system flow instabilities over time-scales spanning tens of rotor revolutions is presented. Simulations of stall inception, growth to fully developed rotating stall, and evidence for hysteresis, secondary instabilities, and other nonlinear phenomena are presented. Signal processing techniques for flow asymmetry characterization are discussed in the context of obtaining low-order representations of the flow disturbances with the ultimate goal of active stall suppression.
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