411 |
Single rotor helicopter performance estimationLukert, Edward Page 12 1900 (has links)
No description available.
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412 |
Study of a wind tunnel jet enclosure designed to simulate free air conditionsMullowney, Penn Evans 05 1900 (has links)
No description available.
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413 |
Modeling and system identification for rotorcraftTeare, David Alan 05 1900 (has links)
No description available.
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414 |
A comparison of the methods of computing the wind stresses in buildingsShahan, Maxwell Lee 05 1900 (has links)
No description available.
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415 |
The interaction of synthetic jets with cross flow and the modification of aerodynamic surfacesHonohan, Andrew M. 05 1900 (has links)
No description available.
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416 |
Battens for two-dimensional sails with prescribed pressure distributions / Battens for 2-dimensional sails with prescribed pressure distributions.Ugolini, Bruno. January 1987 (has links)
No description available.
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417 |
Axisymmetric turbulent jets and wakes that are self-preservingVogel, William Martin January 1974 (has links)
No description available.
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418 |
Applications of liquid crystals in aerodynamic testingBonnett, Paul January 1989 (has links)
This thesis investigates the applications of liquid crystals in three areas of aerodynamic testing, namely temperature, shear stress and pressure measurement over surfaces. The use of the selective reflection colours from encapsulated chiral nematic materials to map surface temperatures is assessed. This method is very successful in a wide range of applications for determining heat transfer rates, but has limitations where high heat transfer rates are present, due to the thermal response time of the material structure, and the effects of temperature gradients. The thermal time constant is determined as a function of material viscosity. It is typically 10ms for a chiral nematic material at room temperature. The effect of a temperature gradient on the selective reflection is studied in terms of the pitch gradient produced in the material structure. Two improved methods are then proposed. The first makes use of the cholesteric to isotropic transition to indicate an isotherm on a heated surface, while the second uses changes in the birefringence colours produced by an aligned nematic layer applied to a surface and viewed between crossed poiarisers. Changes in the selective reflection colours from cholesteric liquid crystals can be used to assess surface shear stress levels. This method is assessed and determined to be too problematical for accurate measurements. A new method is proposed, based on the shear induced texture change from the focal-conic to the Grandjean texture in the cholesteric phase. This method may be used to quantify surface shear stress levels as well as to provide excellent flow visualisation once flow alignment has occurred. Tests have been conducted on the pressure sensitivity of chiral nematic liquid crystal materials. The results indicate that the change in transition temperature with pressure is of the order of 40°/kbar. which may not be sensitive enough for wind tunnel purposes.
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419 |
Sail shape and sailing performance measurement : the Chinese lug sailChapman, Edward John Critchett January 2000 (has links)
No description available.
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420 |
Aerodynamic design optimization of a non-lifting strutVeenendaal, Justin 03 September 2014 (has links)
A design engineer has a desire to obtain the best possible design configuration producing the most desirable result. This is especially true in designs involving aerodynamics. This thesis presents a way to design the optimum airfoil for a non-lifting strut-like application. This is achieved by combining the governing laws of aerodynamics with appropriate numerical models to simulate an inputted steady flow regime. By using a robust yet simple parameterization method to represent airfoils and by implementing a genetic algorithm, optimization is achieved and occurs in a timely manner. Performing the optimization across a range of flow fields and for struts in different applications also allows some trends to be deduced, thus providing valuable knowledge to design engineers.
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