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.
Results
Showing 1 to 20 of 29 for “"nacelle"”.
-
Determining appropriate levels of robotic automation in commercial aircraft nacelle assembly
… robotics in the assembly of the engine nacelle inlet for a commercial aircraft. In addition to addressing the achievable level of automation, this thesis also reviews the evaluation of robotics vendor proposals and the accompanying financial justification requisite for implementation. …
-
Wind tunnel testing of a nacelle bypass concept for a quiet supersonic aircraft
… low-noise supersonic aircraft is the high-flow nacelle bypass concept in which an outer nacelle surface is used to encircle the asymmetric external engine protuberances of a traditional turbine engine. Although this bypass flow may reduce the overall sonic boom signature of the vehicle, the …
-
Interference Drag Due to Engine Nacelle Location for a Single-Aisle, Transonic Aircraft
… surrogate model of the interference drag between nacelles and wing-fuselage systems suitable for the inclusion in a multidisciplinary design optimization (MDO) framework. The target aircraft was a single-aisle, transonic aircraft with a freestream Mach number of 0.8 at 35,000 feet and a design …
-
Computational Assessment of Flow through a High-Flow Nacelle Bypass for Low Supersonic Boom
… sonic boom incorporates a high-flow secondary nacelle bypass to enclose the engine and its protrusions where the flow is diverted around a gearbox through a set of inlet and exit guide vanes. To assess the flow quality within the bypass, computational studies are conducted using traditional …
-
Study of the Influence of Nacelle and Pylon on Aerodynamics of a New VU Design
… thesis was to illustrate the influence of the nacelle and pylon on aerodynamics of a new Very Light Jet design, using Computational Fluid Dynamics.</p> <p>The objective of the first phase was to repair the existing CATIA model in order to facilitate the meshing process.</p> <p>The second and …
-
An experimental study of the aft guide vanes of an engine bypass nacelle for low-boom supersonic flight
… is created during this process. The high-flow nacelle bypass geometry includes a forward and aft fairing to direct the flow around the gearbox, a set of thin forward guide vanes, and a set of thick, strut-like aft guide vanes. The aft guide vanes, which also serve structural purposes, are used …
-
An experimental study of the forward guide vanes of an engine bypass nacelle for low-boom supersonic flight
Made available in DSpace on 2011-08-25T22:16:42Z (GMT). No. of bitstreams: 3 Herrera_Arthur.pdf: 9040481 bytes, checksum: b1cb32088f9dbae91d7f22098b17feb2 (MD5) license.txt: 4064 bytes, checksum: e734bd04ed7c751742bd7380d9b55410 (MD5) Herrera_Arthur.docx: 22589106 bytes, checksum: …
-
Body Force Modeling for Engine Inlet Fan System
… 3D throughflow method to analyze aircraft nacelle/fan systems. The method adopts the body force concept using source terms to model the effects of fan blades. The method is designed to capture interaction effects between bypass fan and nacelle at off-design conditions, especially for …
-
Ultra-short nacelles for low fan pressure ratio propulsors
This thesis addresses the uncharted inlet and nacelle design space for low pressure ratio fans for advanced aeroengines. A key feature in low fan pressure ratio (FPR) propulsors with short inlets and nacelles is the increased coupling between fan and inlet. The thesis presents an integrated …
-
Normal Shock Wave-Boundary Layer Interactions in Transonic Intakes at Incidence
… intake is dominated by the flow-field over the nacelle lower lip, around which the flow might accelerate to supersonic speeds. A shock wave might appear and impinge on the incoming boundary layer. Flow separation may result from this interaction, leading to severe flow distortion. In order to …
-
Propulsion considerations for supersonic oblique flying wings
… ratio, thrust specific fuel consumption, and nacelle wave drag were examined as intermediate figures of merit that would ultimately impact the final performance metric-namely, range parameter and specific excess power. It was found that higher bypass ratio engines could yield an increase in …
-
Multidisciplinary optimization of high-speed civil transport configurations using variable-complexity modeling
… parameterize the wing shape, fuselage shape and nacelle placement are described. Variable-complexity design strategies are used to combine conceptual and preliminary-level design approaches, both to preserve interdisciplinary design influences and to reduce computational expense. The …
-
Trim, Control, and Performance Effects in Variable-Complexity High-Speed Civil Transport Design
… landing requirements, as well as engine nacelle ground strike for lateral-directional requirements. For longitudinal requirements we include nose-wheel lift-off rotation and approach trim as the critical conditions. We found that the engine-out condition and the engine nacelle ground …
-
A method for identifying structural load share opportunities in aircraft powerplant configurations
… practice the various sub-systems (for example: nacelle, inlet, thrust reverser, engine core casings and the pylon mounts) are designed independently to meet their individual specific functional requirements. This results in inefficiencies in the overall system and a lack of understanding of how …
-
Boundary layer ingesting inlet design for a silent aircraft
(cont.) common nacelle, L/D ratios between 2.5 and 3.0, fan face to throat area ratios above 1.06, and offsets lower than 11%. Curvature ahead of the inlet should be avoided as well as bifurcations inside the duct. Inlet performance with an evolved version of the airframe decreased, mainly due to a …
-
Design of a model propulsor for a boundary layer ingesting aircraft
… of work on propulsion system scaling, nacelle and flowpath aerodynamic optimization, mechanical design of the propulsor and characterization of the propulsor electric motors, all in support of the wind tunnel experiments. Explicit definition is given of those designs that meet the …
-
Dynamic response analysis of spar buoy floating wind turbine systems
… turbines functioning in shallow water depths. Nacelle acceleration, static and dynamic tensions on catenaries, the maximum tension acting on the anchors are considered as design performances, and a stochastic analysis method has been used to evaluate those quantities based on sea state spectral …
-
Experimental aero-acoustic assessment of swirling flows for drag applications
… radiating from the downstream exhaust core and nacelle trailing edge regions, respectively.
-
Development of an engine model for an integrated aircraft design tool
… a total engine weight, which also includes the nacelle, nozzle, and pylon. The new model estimates bare engine weight within +/-10% of published values for seven existing engines, and improves TASOPT's accuracy in predicting the geometry, weight, and performance of the Boeing 737-800. The …
Page 1 of 2