Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"deflectors"”.
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Active Drag Reduction of Ground Vehicles Using Air-Jet Wheel Deflectors
<p>Seven turbulence models were used to simulate the flow within the wheelhouse of a simplified vehicle body. The performance of each model was evaluated by comparing the aerodynamic coefficients obtained using computational fluid dynamics (CFD) to data collected from wind tunnel experiments. The …
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CFD simulation of flow fields associated with high speed jet impingement on deflectors
… the impingement of free jets onto stationary deflectors. This investigation was performed to develop a verified modeling ability for such problems. Predictions were compared with the experimental results obtained by Donaldson and Snedeker [1]. Computational models for free and impinging jets …
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Fast scanning two-photon microscopy
… capable of fast scanning using acousto-optic deflectors was designed and implemented. The software controller was expanded so that random access scan in three dimensions could be handled, so that algorithms that can identify neurons from images acquired using the two-photon microscope can be …
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Synthesis of ion microbeam column.
… partition the plates to generate the "octupole" deflectors and correctors. We show that the "octupole" deflectors can drastically slow down the beam degradation with deflection distance and that the correctors can further increase the output current density by more than 300%. Finally, we apply …
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Search for evidence of fermi surface nesting in Bi₂Sr₂Ca₁Cu₂O₈
… Tech has been modified with new momentum deflectors and various other hardware improvements. In addition to some hardware changes all the software to run the spectrometer and analyze the data has been rewritten. It was suggested by Tsuei (1990) that a nested Fermi surface could be used to …
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Comparison of Two Potential Streamgage Locations on Scott Creek at Swanton Pacific Ranch, California
… the installation of a cross-vane and wing-deflectors, to mitigate negative effects of erosion and reestablish a natural channel condition. The upstream location has been selected as the preferred alternative given the remediation measures are successful.</p>
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Modelling and diagnostic study of flow in an optical engine with negative valve overlapping for homogeneous charge compression ignition
… flow effects generated by different intake deflectors indicate that a low-swirl port configuration can potentially improve the fuel and thermal homogeneity by producing higher values of Root Mean Square (RMS) of velocity fluctuation and turbulence intensity. The high-swirl port configuration …
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Investigation of Control Effectors for Ducted Fan VTOL UAVs
… in generating a nose-down pitch moment. Duct deflectors, mounted on the windward strut upstream of the duct, reduced the windward lift produced by both the fan and duct, resulting in a nose-down pitch moment. Opposed vanes, utilizing two vanes and flaps for each of the four assemblies, were …
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Drag reduction of cube-van through boundary-layer control: wind tunnel experiments and prototype road tests
… and cheaper alternative to the 'nose cones' and deflectors available in the market. It is recommended that further road tests should be conducted using both boundary-layer control devices.
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Reconfigurable Photonics based on Broadband Low-loss Optical Phase Change Materials
… large spectral tuning range and metasurface deflectors are demonstrated.
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Measuring and evaluating log truck performance in a variety of operating conditions
… maintenance expenses. Application of aerodynamic deflectors might be beneficial and their applicability should be tested. (4) Some driving styles appear more efficient and deserve further investigation and documentation. Changing driver behavior might present the most cost effective means of …
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Liquid Crystal Optics For Communications, Signal Processing And 3-d Microscopic Imaging
… aperture weak lens. Using a 1-D array of LC deflectors, a broadband optical add-drop filter (OADF) is proposed for dense wavelength division multiplexing (DWDM) applications. By binary control of the drive signal to the individual LC deflectors in the array, any optical channel can be …
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An Experimental Investigation of Underbody and Near Wake Aerodynamics of Heavy Goods Vehicles
… and the rotating wheels. Furthermore, wheel flow deflectors, which emulate the effect of mudguards, are found to increase drag. Careful shaping can alleviate this. Finally, bluff bodies stowed in the trailer underbody appear to have a negligible impact on aerodynamic drag, probably due to two …