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 17 of 17 for “"turboprop"”.
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The effect of turboprop propulsion on the aerodynamic benefits of formation flight
In order to determine the effect of turboprop propulsion on the aerodynamic benefits of formation flight, a 3D Vortex Filament Method (VFM) programme, which made use of a Burnham-Hallock viscous core model, was formulated and employed to model the progression and interaction of the wing and …
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Investigation of the Impact of Turboprop Propulsion on Fuel Efficiency and Economic Feasibility
This study explored a 130-passenger advanced turboprop commercial airliner with the purposes of economic feasibility and energy efficiency. A baseline vehicle and a derivative vehicle were researched and analyzed in detail. Based on the findings of this analysis, an advanced future airliner was …
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The evolution of U.S. commercial domestic aircraft operations from 1991 to 2010
… the aircraft analyzed into four categories: turboprop, regional jet, narrow-body, and wide-body. Our study consists of three parts. First, we compare the four aircraft classes and explore trends in available seat miles, revenue passenger miles, load factor, aircraft departures, average stage …
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Technology elasticity : demand impact on the commercial success of regional aircraft
… the social aspects of regional aircraft - twin-turboprops and jets - into the market. The data analysis shows that price and MAU have a positive correlation of 0.92 for regional jets. Similarly, the twin-turboprop airplanes have a correlation of 0.86. The price and demand are mildly positively …
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A Requirements analysis methodology for turboelectric aircraft
… meet thrust requirements faster than traditional turboprop engines could. On the other hand, large power deviations could potentially destabilize the electrical components. This thesis develops an analysis methodology to determine the requirements for a turboelectric aircraft prior to detailed …
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Design and Evaluation of a Lean-Premixed Hydrogen Injector with Tangential Entry in a Sector Combustor
… for the cruise engine condition for a PT6-20 turboprop engine. Swirl generated by tangential entry was utilized as a means to enhance mixing and as a convenient means to stabilize the flame. A prototype was designed to prevent flashback and promote a high degree of mixing, as well as a test …
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A Lean-Premixed Hydrogen Injector with Vane Driven Swirl for Application in Gas Turbines
… under combustor inlet conditions of a PT6-20 Turboprop have been made.
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Conceptual Design for a Laminar-Flying-Wing Aircraft
… laminar-flying-wing concept, propelled by three turboprop engines, with a cruise range of 9000 km is developed. The estimated fuel burn is 13.9 g/pax.km. For comparison, a conventional aircraft, propelled by four turboprop engines, with a high-mounted, unswept, wing is designed for the same …
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Digital Fuel Control for a Lean Premixed Hydrogen-Fueled Gas Turbine Engine
… modified Pratt and Whitney PT6A-20 turboprop engine was successfully designed and implemented. Included in the design are safety measures to protect the operating personnel and the engine. A redundant fuel control is part of the final design to provide a second method of managing the …
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An Investigation of Lean Premixed Hydrogen Combustion in a Gas Turbine Engine
… in a modified Pratt and Whitney Canada PT6A-20 turboprop engine. The tests examined the premixer and engine operability as a result of the modifications. A computer cycle analysis model was created to help analyze and predict the behavior of the modified engine and premixers. The model, which …
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The development of a fixed wing aircraft analysis and design flight dynamic software
… aircraft while the fifth aircraft represented a turboprop aircraft. The flight dynamics behavior motion which consisted of 22 flight variables were obtained by solving the governing equation of flight after the aerodynamic characteristics data were established and the trimmed fight conditions …
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The active minimisation of harmonic enclosed sound fields, with particular application to propeller induced cabin noise
… internal acoustic response of a 48 seat, twin turboprop passenger aircraft are presented. These consist of the structural response of an isotropic, thin cylindrical shell of finite length and the acoustic response of the enclosed cyclindrical sound field. It is shown that, provided the external …
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An Alternative Method of Identification of a Failed Engine in Twin-Engine Propeller Aircraft
… of airline pilots who operate twin-engine turboprop aircraft. Twenty-nine percent of respondents to the survey agreed with the statement that there could be a better method of identification of a failed engine. Thirty-four percent of respondents who provided suggestions for improvement of a …
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Simulation of 3-D viscous compressible flow in multistage turbomachinery by finite element methods
… a rotor blade passage of the power turbine of a turboprop.
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Active structural acoustic control of double panel systems including hierarchical control approaches
… from the noise field generated by an advanced turboprop engine through the aircraft fuselage and the interior trim into the interior acoustic field which can be modeled as a double panel system. The system studied was a double panel model consisting of two rectangular, uniform, flat plates …
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The historical fuel efficiency characteristics of regional aircraft from technological, operational, and cost perspectives
… operational and cost characteristics of turboprop and regional jet aircraft have influenced the fuel efficiency of the regional aircraft fleet. These characteristics have been compared to larger narrow and wide body aircraft, providing two different perspectives on technology evolution, …
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Air Transportation Modeling to Evaluate Airport Runway Infrastructure and Supersonic Transport Demand
… jets but fall short for modern piston and turboprop aircraft. The models developed include aircraft stage length and payload-range analysis to assist airport designers and improve decision-making. The stage length analysis model uses Traffic Flow Management System (TFMS) data to estimate …