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 10 of 10 for “"ram-air"”.
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Preliminary Test Predictions for Scale Ram-Air Parachute Testing
… performance for experimental tests of ram-air parachutes in a wind tunnel. A scaled experimental test setup is developed for determining the aerodynamic coefficients of lift (𝐶𝐿) and drag (𝐶𝐷) conducted in a wind tunnel. Additionally, a CFD approach where a steady-state parachute shape …
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Ram air turbine enhancement for auxiliary power unit replacement
… fuels are currently the primary energy source of aircraft and cause harm to the environment. This study highlights the use of clean energy instead of fossil fuels in aircraft. This work aimed to study the possibility of dispensing auxiliary power unit (APU) in aircraft powered by fossil fuels to …
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A Computational Fluid Dynamics Study on the Aerodynamic Performance of Ram-Air Parachutes
<p>The modeling of a ram-air parachute presents challenges in the prediction of the inflight geometry, as there is a strong interaction between the flow field and parachute structure. This thesis presents the development of a CAD design and CFD methodology to the simulation of ram-air parachutes in …
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Experimental Evaluation of Innovative Thermal Energy Storage Options for a Hypersonic Non-Airbreathing Vehicle's Internal Loads
Managing the thermal loads inside a non-airbreathing hypersonic vehicle is particularly difficult. The heat generated by the power electronics, avionics, etc. must be removed so that the components do not exceed their maximum temperatures. These vehicles cannot dump the waste heat into fuel or ram …
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The development, optimisation and testing of an unmanned parafoil launch system
… suspended payload is required to determine the parameters and characteristics of the system in free flight. Flexible ram-air inflated parafoils display high sensitivity to atmospheric disturbances which complicates the comparison of measured flight-dynamic data to theoretical models in an open air …
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Extended Range Tactical Resupply Using Tailless UAV
… standoff distances, potentially endangering aircraft personnel as well as bystanders. Hardware-in-the-loop simulations provide an efficient method for evaluating various wing designs and actuation configurations. Four control surface configurations are presented and evaluated, encompassing …
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More Electric Systems Architecture Effect on Business Jet Performance
… Dassault Falcon 2000. A model of the existing aircraft, both of its overall flying characteristics and performance and of its detail systems layout, is created using Pacelab APDc and SysArcc programs. The model is validated with respect to the aircraft published data. Then, another model of the …
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Actuator Disk Theory for Compressible Flow
… was to predict the ideal performance of a small ram-air turbine (microRAT), operating at high subsonic Mach numbers, that would power an autonomous Boundary Layer Data System during test flights. The compressible-flow governing equations were applied to a propeller and a turbine for both the bare …
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A hierarchical control strategy for aircraft thermal systems
Aircraft systems present an interesting control problem given the fact that there exist multiple objectives, actuators, and physical dependencies throughout the system. For decades the onboard systems of aircraft have worked in isolation seeking to achieve their goals while giving little to no …
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Modelling of the degradation of mechanical properties of glass fiber reinforced composites (GFRP) due to environmental aging
… and the application of this methodology to the air-conditioning system of modern civil aircrafts. Nowadays, the evolution of technology requires the detail study of the structural material used in a certain application as well as the detail structural analysis and the optimization of the …