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 35 for “"inlet distortion"”.
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Active control rotating stall with inlet distortion
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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Effect of BLI-Type Inlet Distortion on Turbofan Engine Performance
… boundary layer flow through a serpentine inlet into a turbofan engine adversely affects the performance of the engine. The available literature has only yielded studies of the effects of this specific type of inlet distortion on engine performance in the form of numerical simulations. This …
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A New Method for Generating Swirl Inlet Distortion for Jet Engine Research
… produce thrust. Because of their reliance on an inlet stream, jet engines are very sensitive to inlet flow nonuniformities. This makes the study of the effects of inlet nonuniformities essential to improving jet engine performance. Swirl distortion is the presence of flow angle nonuniformity in …
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Influence of unsteady losses and deviations on compression system stability with inlet distortion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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An assessment of computational procedures for eleven-stage compressor response to inlet distortion
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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Active control of rotating stall in a transonic compressor stage with inlet distortion
… transonic axial flow compressor with inlet distortion using active feedback control. The experiments were conducted at the NASA Lewis Research Center on a single-stage transonic core compressor. An annular array of 12 jet-injectors located upstream of the rotor tip was used for forced …
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Measurement and Uncertainty Analysis of Transonic Fan Response to Total Pressure Inlet Distortion
Distortion tolerant fans represent the enabling technology for the successful implementation of highly integrated airframe propulsion system vehicles. This investigation extends the study of fan-distortion interactions to an actual turbofan engine with a total pressure distortion profile …
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A three-dimensional turbine engine analysis compressor code (TEACC) for steady-state inlet distortion
… highly distorted flow to the compressor. Inlet distortion generally reduces the engine compressor stability margin and may induce compressor surge at high rotational speeds, or rotating stall at lower rotational speeds. Therefore, a computational fluid dynamics (CFD) based compressor …
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Prediction of Inlet Distortion Transfer Through the Blade Rows in a Transonic Axial Compressor
Inlet total pressure non-uniformities in axial flow fans and compressors can contribute to the loss of component structural integrity through high cycle fatigue (HCF) induced by the excitation of blade vibratory modes. As previous research has shown total pressure distortion to be the dominant HCF …
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Performance and stalling behavior of an axial-flow compressor subjected to three circumferential inlet distortion levels
… compressor subjected to several different inlet distortion patterns was investigated. The effect of inlet distortion on overall compressor performance was determined through the measurement of compressor characteristics for each inlet flow condition. Dynamic pressure transducers were …
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An experimental investigation of the influence of inlet distortion on the fluid borne noise of a centrifugal pump
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Methodology Development and Investigation of Turbofan Engine Response to Simultaneous Inlet Total Pressure and Swirl Distortion
… in modern conceptual aircraft, a novel inlet distortion generator (ScreenVaneTM) was invented. The device simultaneously reproduces combined inlet total pressure and swirl distortion elements in a tailored profile intended to match a defined turbofan engine inlet distortion profile. The …
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Body Force Modeling for Engine Inlet Fan System
… conditions, especially for circumferential inlet distortions. The unique feature of this body force model compared to conventional throughflow methods is that it requires no information about the fan blade geometry. Instead, fan performance data is fed into the body force model, and the …
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A computational model for rotating stall and inlet distortions in multistage compressors
… disturbances associated with instability and inlet distortion in multistage compressors. Specifically, the model is aimed at simulating the non-linear aspects of short wavelength stall inception, part span stall cells, and compressor response to three-dimensional inlet distortions. The …
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Probabilistic analysis of compression system stability using importance sampling
… the phase interaction effects between inlet distortion and stationary asymmetric tip clearance. The phase interaction is an example of a case when the stability margin approach fails to capture both the quantitative and qualitative behaviors.
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Evaluation of propulsor aerodynamic performance for powered aircraft wind tunnel experiments
… powered wind tunnel tests (Reynolds number and inlet distortion) were replicated. This propulsor characterization was found to convert the electrical power measurements to mechanical ow power with experimental uncertainty of roughly 1.6%.
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Installation Effects on Variable Pitch Fans
… thrust. This thesis aims to study the effects of inlet distortion on variable pitch fan performance in reverse thrust operation, to find the most influential distortion components and to determine the way to operate a variable pitch fan with inlet distortion. Steady RANS and rig measurements are …
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New Methodology for the Estimation of StreamVane Design Flow Profiles
Inlet distortion research has become increasingly important over the past several years as demands for aircraft flight efficiency and performance has increased. To accommodate these demands, research progression has shifted the emphasis onto airframe-engine integration and improved understanding of …
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Performance of a boundary layer ingesting propulsion system
… body force approach to fan response to inlet distortion has been utilized to analyze the flow in the engine ducts. In addition to providing quantitative information as to the fuel burn benefit from BLI, the body force approach is also compared with two simpler analyses, one based on the …
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Fan noise reduction from a supersonic inlet
… the radiation of fan noise through a supersonic inlet. A scaled-down model of an axisymmetric, mixed-compression, supersonic inlet (P-inlet) was used in conjunction with a 10.4 cm (4.1 in) diameter turbofan engine simulator as the noise source. The tests were conducted at an outdoor facility …
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