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 20 of 55 for “"low aspect ratio"”.
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Experimental investigation of low aspect ratio aerofoils.
Thesis: M.S., Massachusetts Institute of Technology, Department of Ocean Engineering, 1972
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Heat Transfer from Low Aspect Ratio Pin Fins
… fins with the row oriented perpendicular to the flow. The configurations studied have spanwise spacing to pin diameter ratios of two, four, and eight. Low aspect ratio pin fins were studied whereby the channel height to pin diameter was unity. The experiments are carried out for a Reynolds number …
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Heat Transfer from Multiple Row Arrays of Low Aspect Ratio Pin Fins
… internal cooling methods for turbine airfoils. Low aspect ratio pin fin arrays were tested through a range of Reynolds numbers between 5000 and 30,000 to determine the effects of pin spacing as well as aspect ratio on pin and endwall heat transfer. Experiments were also conducted to determine …
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Aerodynamic Force and Pressure Loss Measurements on Low Aspect Ratio Pin Fin Arrays
… pin spacing, streamwise pin spacing, pin aspect ratio, and flow incidence angle. Direct two-component force measurement is achieved with a cantilever beam force sensor that uses highly sensitive piezoresistive strain gauges, relating the strain at the base of the beam to the applied force. …
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Aeroelastic modeling and flutter control in aircraft with low aspect ratio composite wings
… different flutter mechanisms for a variety of low aspect ratio wing configurations. The most critical flutter mechanism was found to be body-freedom flutter, a coupling of aircraft pitching and wing bending motions, for wings in a forward-sweep configuration. In addition, a modal approximation …
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Investigation of sub-meter shields for a low aspect ratio D-T Tokamak fusion reactor
… energy. The spherical tokamak, which has a very low aspect ratio, is the most promising of the compact magnetic fusion reactor designs. This compactness imposes a severe material constraint on the design, as a highly compact device will have very thin inner shielding. This inner shielding, which …
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Formulation of a structural model for flutter analysis of low aspect ratio composite aircraft wings
… accuracy for flutter analysis of modern low aspect ratio composite wings. The latter is too computationally intensive for use in the inner loop of a simultaneous multidisciplinary optimization problem. The derived model provides a useful preliminary design tool as well.
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The application of low aspect ratio hydrofoils to the secure positioning of static equipment in tidal streams.
… lift force that can be developed from the flow over a hydrofoil can be used to resist the slip and overturning moments applied to a structure by the flow. The fundamental theory of axial and crossflow energy conversion devices is outlined and the current methods of fixing and supporting …
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Analysis of pressure data obtained at transonic speeds on a thin low-aspect-ratio cambered delta wing-body combination
… characteristics of a thin conical cambered low-aspect-ratio delta wing in combination with a basic body and a body indented symmetrically for a Mach number of 1.2 in accordance with the supersonic area rule. The tests were conducted at Mach numbers from 0.60 to 1.12 and at 1.43 and at angles …
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The effects of low aspect ratio and heat exchanging internals on the bubble properties and flow regime in a pilot-plant bubble/slurry bubble column for Fischer-Tropsch synthesis
… the presence of internals, and reducing the aspect ratio and the solids loading, increase the local gas holdup, interfacial area, bubble passage frequency, and decrease the bubble rise velocity, bubble chord length. Meanwhile, the aspect ratio H/D = 4, and 5 provide enough height to …
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Αντισεισμική συμπεριφορά υποστυλωμάτων και δοκών με μικρό άνοιγμα διάτμησης και συγκριτική πειραματική έρευνα για διάφορους τύπους όπλι...
… INVESTIGATION OF THE SEISMIC RESISTANCE OF LOW ASPECT RATIO SHORT COLUMNS AND BEAMS REINFORCED WITH A) CONVENTIONAL PARALLEL BARS, B) INCLINED BARS ARRANGED SO AS TO FORM A RHOMBIC TRUSS AND C) A COMBINATION OF PARALLEL AND DIAGONAL BARS, UNDER SEISMIC RESISTANCE OF REINFORCED CONCRETE LOW …
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Internal tides near steep topographies
… accuracy in this framework. We find that, for low-aspect ratio topographies, the z-coordinate mesh in the 2DFV code produces numerical artifacts near the bathymetry. To ameliorate these stair-casing effects, and to develop the framework towards a moving mesh with free-surface dynamics, we have …
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The Influence of Yaw and Coning on Small Bio-Inspired Wind Turbines
… study consists of wind tunnel measurements of low aspect ratio horizontal-axis wind turbine models. The tested coning angles (β) ranged from 5◦ to 25◦, and power and tip-speed ratio were measured at Reynolds numbers Re_D = [0.46 ×10^5, 1.8 ×10^5]. Results show that coning improves the power …
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Laser direct-write fabrication of MEMS
… of fabrication material selection and integration. Recent developments in alternate MEMS fabrication processes such as PCB-MEMS, laminate MEMS, pop-up book MEMS, and soft-MEMS have reduced fabrication cost, increased material choice, and facilitated material integration. However, MEMS …
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Multi-path planning for hydraulic fluid routing
… the solution for exact correctness in a low aspect ratio scenario, as opposed to approximate correctness in high aspect ratio scenarios, where topological approaches are typically applied. I applied this algorithm to 3D printed hydraulically actuated robots, though it has additional …
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Flowfield study of a close-coupled canard configuration
… five-hole pressure probe was used to complete a flowfield survey behind a close-coupled canard and wing model set a 32 degrees angle of attack. The canard and wing were both low-aspect-ratio, highly swept, delta platforms with rounded leading edges. The model was set at to condition of maximum …
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Computational and experimental study of trailing vortices
… study was behavior of the vortices trailing from low aspect ratio lifting surfaces. Vortex formation in the near-wake was measured in a wind tunnel with yaw-head and hot-wire probes at three different Reynolds numbers, the highest of which was greater than most previous studies. These near-wake …
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Integrated structural design, vibration control, and aeroelastic tailoring by multiobjective optimization
… showed that the integrated design for a high aspect ratio, unswept, straight, isotropic wing can be separable. Finally, an efficient modal solution of the flutter equation facilitated the aeroelastic tailoring of a low aspect ratio, forward swept, composite plate wing model.
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Theory of slow coupled translational-rotational dynamics and viscoelasticity of nonspherical particle suspensions
… and cumulative rotational angle as the relevant slow variables, and a two-dimensional dynamic free energy surface determined by equilibrium structure which quantifies localizing forces and torques. For hard-core uniaxial objects, three types of dynamic phases are predicted: fluid, plastic glass …
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